CN107317650B - Device, method and system for experimental teaching of time division wavelength division multiplexing optical fiber communication - Google Patents
Device, method and system for experimental teaching of time division wavelength division multiplexing optical fiber communication Download PDFInfo
- Publication number
- CN107317650B CN107317650B CN201710534791.XA CN201710534791A CN107317650B CN 107317650 B CN107317650 B CN 107317650B CN 201710534791 A CN201710534791 A CN 201710534791A CN 107317650 B CN107317650 B CN 107317650B
- Authority
- CN
- China
- Prior art keywords
- channel
- signal
- pulse
- circuit
- electric signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000004891 communication Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000013307 optical fiber Substances 0.000 title claims description 7
- 238000005070 sampling Methods 0.000 claims abstract description 81
- 230000003287 optical effect Effects 0.000 claims abstract description 41
- 230000001360 synchronised effect Effects 0.000 claims abstract description 23
- 238000007493 shaping process Methods 0.000 claims description 54
- 239000000284 extract Substances 0.000 claims description 42
- 238000006243 chemical reaction Methods 0.000 claims description 27
- 230000009466 transformation Effects 0.000 claims description 16
- 230000005611 electricity Effects 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 2
- 210000001367 artery Anatomy 0.000 claims 2
- 210000003462 vein Anatomy 0.000 claims 2
- 238000002474 experimental method Methods 0.000 abstract description 17
- 238000012360 testing method Methods 0.000 abstract description 10
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 3
- 239000003990 capacitor Substances 0.000 description 19
- 238000010586 diagram Methods 0.000 description 17
- 239000013078 crystal Substances 0.000 description 8
- 230000000630 rising effect Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 239000000835 fiber Substances 0.000 description 6
- 102100040844 Dual specificity protein kinase CLK2 Human genes 0.000 description 5
- 101000749291 Homo sapiens Dual specificity protein kinase CLK2 Proteins 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- PCTMTFRHKVHKIS-BMFZQQSSSA-N (1s,3r,4e,6e,8e,10e,12e,14e,16e,18s,19r,20r,21s,25r,27r,30r,31r,33s,35r,37s,38r)-3-[(2r,3s,4s,5s,6r)-4-amino-3,5-dihydroxy-6-methyloxan-2-yl]oxy-19,25,27,30,31,33,35,37-octahydroxy-18,20,21-trimethyl-23-oxo-22,39-dioxabicyclo[33.3.1]nonatriaconta-4,6,8,10 Chemical compound C1C=C2C[C@@H](OS(O)(=O)=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@H](C)CCCC(C)C)[C@@]1(C)CC2.O[C@H]1[C@@H](N)[C@H](O)[C@@H](C)O[C@H]1O[C@H]1/C=C/C=C/C=C/C=C/C=C/C=C/C=C/[C@H](C)[C@@H](O)[C@@H](C)[C@H](C)OC(=O)C[C@H](O)C[C@H](O)CC[C@@H](O)[C@H](O)C[C@H](O)C[C@](O)(C[C@H](O)[C@H]2C(O)=O)O[C@H]2C1 PCTMTFRHKVHKIS-BMFZQQSSSA-N 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 102100022002 CD59 glycoprotein Human genes 0.000 description 3
- 101000897400 Homo sapiens CD59 glycoprotein Proteins 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910002056 binary alloy Inorganic materials 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 206010048669 Terminal state Diseases 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/572—Wavelength control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/08—Time-division multiplex systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses a kind of device for time-division division multiplex fibre-optic communication wave experimental teaching, method and system, it include the original signal of different channels is modulated into time-multiplexed electric signal be then converted into wavelength-division multiplex optical signal signal sending end and isolate the signal receiving end that optical signal is reduced into the original signal of different channels by different wave length optical signal.The knowledge such as the present invention can set multiple groups sensing point, and the sampling of the understanding analog signal for making student more deep, sampling theorem, pulse-amplitude modulation and demodulation, time division multiplexing are synchronous with demultiplexing, the foundation of data frame, the detection of pulse width, signal；It solves the problems, such as to be easy to happen conducting wire wrong during test, and experiment can be optimized on this basis, circuit function is clear, convenient for safeguarding, strong convenient for student's debugging, application, can more intuitively display data transmission with processing during different moments signal condition, to Experimental Teaching Courses have stronger application value.
Description
Technical field
The present invention relates to time-divisions and division multiplex fibre-optic communication wave technical field, and in particular to one kind is used for time-division wavelength-division multiplex
The device of fiber optic communication experimental teaching, method and system.
Background technique
Become increasingly popular with the rapid development of communication technology with 3G communication network, with higher speed, higher capacity it is logical
Letter technology is increasingly favored by people.It is headed by TD-SCDMA technology, by China's independent research, possess independent intellectual property right
3G technology obtained whole world approval, improve the Communication in China industry capability of independent innovation and core competitiveness, be promote China
The important measure of informationized society.The communication technology of continuous development, increasingly complicated communication network are to colleges and universities' communication class profession
More stringent requirements are proposed by student, not only requires the theoretical basis that students are sturdy, and start to the experiment of student be also
Acid test.However, still having biggish talent shortage in this professional domain, therefore, being badly in need of culture a batch has relatively by force
The talent of the ability of practice and initiative spirit, to meet demand for talent.
The courses such as fiber optic communication, Principle of Communication are the important specialized courses of colleges and universities' communication class profession, and such course is had
Require each colleges and universities not only to carry out theoretical course the features such as theoretical property is strong, conceptual abstraction, strong practicality, also to open up experiment religion
Learn course.On the one hand Experimental Teaching Courses strengthen students practical abikty, deepen the understanding to theoretical knowledge；On the other hand more
Add it is intuitive, profoundly to student teach knowledge, Research Thinking is provided, meanwhile, also improve whereby it is a set of with scientific theory for guidance,
Practical exploration is the teaching system of power, improves the theoretical tray and the ability of practice of domestic college student.For this purpose, country is to communication class
Experimental Teaching Courses are paid much attention to, and each colleges and universities are also equipped with corresponding experimental instruments.
And currently, the Experimental Teaching Courses that open up of each colleges and universities mainly around experimental box provided by each producer, it is point multiple when light
With and demultiplexing experiment be fiber optic communication experiment in it is important experiment one of.Existing experimental box is able to satisfy experimental teaching requirement substantially,
But there is also such-and-such deficiencies.Be mainly manifested in: the core of existing experimental box mostly uses greatly programmable chip or high collection
At degree communication chip, analog signal module, digital signal module, optical transmitter module, optical receiver module, multiplexing and solution are generally comprised
Multiple modules such as Multiplexing module, need to connect the connecting line of each functional module when student tests, right solution data transmission with
The process of processing does not recognize intuitively, the basic principle and step of inconvenience debugging and study Optical Time Division Multiplexing and demultiplexing, only
The scattered each knowledge point of understanding of energy, lacks systematicness and integrality；And such experimental box due to interface it is excessive, testing
During be easy to that there is a situation where misconnection conducting wires.Simultaneously because existing experimental box time-division wavelength-division multiplex system is complex,
Student carries out such contrived experiment or secondary development experiment, typically just progress software design, is seldom related to hardware
Extension.
Summary of the invention
In view of this, the present invention propose it is a kind of for the device of time-division division multiplex fibre-optic communication wave experimental teaching, method and
System is designed based on full non-programmed chip, is only retained input terminal two signal input interfaces that difference is not present, is very suitable for
For Experimental Teaching Courses, carries out experiment designed convenient for student, student is made to be more clear signal in entire multiplex process
Situation of change deepens the study and research of theoretical course.
The present invention is solved the above problems by following technological means:
A kind of device for time-division division multiplex fibre-optic communication wave experimental teaching, comprising:
Signal sending end, generate modulation needed for modulating clock pulse, generate multiple channel frequencies are identical, pulsewidth is different,
Pulse sampling pulse wrong between having synchronizes multiple channel sample pulses, then to multiple channel original signals of input
Pulse width modulation is carried out respectively, modulated multiple Channel Modulation signals is time-multiplexed, then will be after time division multiplexing
Electric signal is converted to the optical signal of different wave length, and the optical signal of different wave length is finally carried out wavelength-division multiplex；
Signal receiving end demultiplexes the signal of wavelength-division multiplex to obtain the optical signal of different wave length, by the light of different wave length
Signal is converted into electric signal, the time division multiplexing electric signal after being demultiplexed, by the time division multiplexing electric signal shaping after demultiplexing
Multiple channel shaping electric signals are obtained, demodulation clock pulse needed for generating demodulation carries out multiple channel shaping electric signals same
Step, extracts that multichannel frequency is identical, pulsewidth is different, pulse wrong demodulation pulse continuously from time division multiplexing electric signal, by multichannel
Demodulate pulse and carry out isolated multiple channels and demodulate pulses, and the demodulation pulse of multiple channels is synchronized, then by synchronizing after
Multiple channels demodulation pulse pair synchronize after multiple channel shaping electric signals demodulation, finally restore the original letter of multiple channels
Number.
Further, the signal sending end includes transmitting terminal clock, and transmitting terminal output terminal of clock connects double-channel sampling
Pulse-generating circuit input terminal, it is defeated that double-channel sampling pulse the first output end of generation circuit connects the first Channel Modulation circuit second
Enter end, double-channel sampling pulse generation circuit second output terminal connects the second input terminal of second channel modulation circuit, the first channel
Modulation circuit first input end connects the first channel input interface, and second channel modulation circuit first input end connects second channel
Input interface, the first Channel Modulation circuit output end connect adder circuit input terminal with second channel modulation circuit output end,
Adder circuit output end connects electro-optical conversion circuit input terminal, and electro-optical conversion circuit output end connects WDM wave multiplexer input terminal；
Modulating clock pulse needed for transmitting terminal clock generates modulation, double-channel sampling pulse generation circuit generate frequency phase
First channel sample pulse and second channel sampling pulse same, pulsewidth is different, pulse is wrong between having, by the first channel sample pulse
It is synchronized with second channel sampling pulse, the first Channel Modulation circuit connects the first channel sample pulse and the input of the first channel
The electric signal of mouth is multiplied to obtain the first modulated signal, and second channel modulation circuit is defeated by second channel sampling pulse and second channel
The electric signal of incoming interface is multiplied to obtain the second modulated signal, and the first modulated signal is added by adder circuit with the second modulated signal
It is time-multiplexed to obtain time division multiplexing electric signal, time division multiplexing electric signal obtains the light of different wave length by electro-optical conversion circuit
The optical signal of different wave length is carried out wavelength-division multiplex by signal, last WDM wave multiplexer.
Further, the signal receiving end includes WDM channel-splitting filter, and WDM channel-splitting filter input terminal connects the output of WDM wave multiplexer
End, WDM channel-splitting filter output end connect photoelectric conversion circuit input terminal, photoelectric conversion circuit output end connection signal shaping circuit the
One input terminal and double-channel sampling pulse extract circuit input end, and it is whole that double-channel sampling pulse extracts circuit output end connection signal
The second input terminal of shape circuit and double-channel sampling pulse split circuit first input end, signal transformation circuit third input terminal and double
The second input terminal of channel sample pulse-separating circuit connects receiving end output terminal of clock, signal transformation circuit output end connection first
Channel signal extracts circuit first input end and second channel signal extracting circuit first input end, the separation of double-channel sampling pulse
The first output end of circuit connects the first channel signal and extracts the second input terminal of circuit, and double-channel sampling pulse split circuit second is defeated
Outlet connects the second input terminal of second channel signal extracting circuit, and the first channel signal extracts circuit output end and connects the first channel
Low-pass filter input terminal, second channel signal extracting circuit output end are connected to second channel low-pass filter input terminal, the
One channel low pass filter output end connects the first channel output interface, the second letter of second channel first low pass filter output connection
Road output interface；
WDM channel-splitting filter demultiplexes the signal of wavelength-division multiplex to obtain the optical signal of different wave length, and photoelectric conversion circuit will not
The optical signal of co-wavelength is converted into electric signal, the time division multiplexing electric signal after being demultiplexed, and signal transformation circuit will demultiplex
Time division multiplexing electric signal shaping afterwards obtains the first shaping electric signal and the second shaping electric signal, and receiving end clock generates demodulation institute
The demodulation clock pulse needed, the first shaping electric signal and the second shaping electric signal are synchronized, and double-channel sampling pulse extracts
Circuit extracts that double-channel frequency is identical, pulsewidth is different, pulse wrong demodulation pulse continuously from time division multiplexing electric signal, and double-channel is adopted
Double-channel demodulation pulse is carried out isolated first channel demodulation pulse to sample pulse-separating circuit and second channel demodulates pulse,
Receiving end clock demodulates pulse to the first channel and second channel demodulation pulse synchronizes, and the first channel signal extracts circuit will
The first channel demodulation pulse after synchronizing with it is synchronous after the first shaping electric signal be multiplied to obtain the first channel sample electric signal, the
Two channel signals extract circuit will synchronize after second channel demodulation pulse with it is synchronous after the second shaping electric signal be multiplied to obtain
Second channel samples electric signal, and the first channel sample electric signal obtains the first channel telecommunications after the first channel low pass filter
Number, second channel sampling electric signal obtains second channel electric signal, the first channel telecommunications after second channel low-pass filter
Number by the first channel output interface export, second channel electric signal by second channel output interface output.
Further, clock pulse frequency caused by the transmitting terminal clock and the receiving end clock is not identical.
A method of for time-division division multiplex fibre-optic communication wave experimental teaching, comprising:
S1, generate modulation needed for modulating clock pulse, generate between multiple channel frequencies are identical, pulsewidth is different, pulse has
Wrong sampling pulse, multiple channel sample pulses are synchronized；
S2, pulse width modulation is carried out respectively to multiple channel original signals of input, by modulated multiple channel tune
Signal processed is time-multiplexed；
S3, the optical signal that the electric signal after time division multiplexing is converted to different wave length, then by the optical signal of different wave length
Carry out wavelength-division multiplex；
S4, the signal of wavelength-division multiplex is demultiplexed to obtain the optical signal of different wave length, the optical signal of different wave length is converted
At electric signal, time division multiplexing electric signal after being demultiplexed is obtained the time division multiplexing electric signal shaping after demultiplexing multiple
Channel shaping electric signal；
S5, the required demodulation clock pulse of demodulation is generated, multiple channel shaping electric signals is synchronized；
S6, extract that multichannel frequency is identical, pulsewidth is different, pulse wrong demodulation pulse continuously from time division multiplexing electric signal,
Multiple channel demodulation pulse is subjected to isolated multiple channels and demodulates pulse, and the demodulation pulse of multiple channels is synchronized；
S7, again by after synchronizing multiple channels demodulation pulse pair synchronize after multiple channel shaping electric signals demodulate, finally
Restore multiple channel original signals.
A kind of system for time-division division multiplex fibre-optic communication wave experimental teaching, at least one institute including side user terminal
State signal sending end and the signal receiving end equal with signal sending end quantity, further include other side user terminal and side
The signal sending end quantity of the user terminal equal signal sending end and the signal receiving end, the first letter of side user terminal
Number transmitting terminal connects the first photo-coupler by the first optoisolator, and the first signal receiving end of side user terminal passes through the second light
Isolator connects the first photo-coupler, and the first photo-coupler connects the first wavelength division multiplexer, the second signal of other side user terminal
Transmitting terminal connects the second photo-coupler by third optoisolator, and the second signal receiving end of other side user terminal passes through the 4th light
Isolator connects the second photo-coupler, and the second photo-coupler connects the second wavelength division multiplexer, and the first wavelength division multiplexer passes through optical fiber
It is connect with the second wavelength division multiplexer.
Compared with prior art, beneficial effects of the present invention are as follows:
1), present invention ensures that modulated signal can be stable addition, reduce error；
2), the present invention proposes that the demodulation pulse of receiving end (is simulated actual by the time multiplexing signal triggering after shaping
Communication system) method, demodulating same mutually restrict between pulse ensures accurately to demodulate；
3), the present invention is applied to the sampling of analog signal, pulse-amplitude modulation and demodulation, time division multiplexing with demultiplex
With the foundation of data frame, the detection of pulse width, the knowledge points such as Wave division multiplexing and demultiplexing are deepened each of student and known
Know point theory study, improve the meaning of experiment, while can also carry out the experiment designed of student, clock synchronization partial wave point using this device
The parameters of multiplex system are adjusted, and carry out hardware expanding；
4) present invention uses non-programmed logical device completely, can set multiple groups sensing point, to clock signal, debugging pulse, adjusts
Signal processed, time multiplexing signal, demodulation pulse, demodulated signal etc. compare；
5), the present invention is combined by being time-multiplexed with wavelength-division multiplex, keeps system more perfect；
6), the present invention can apply in a variety of time-multiplexed systems, and double-channel high quality, low error rate may be implemented
Effective transmission；
7), the present invention reduces unnecessary line during circuit design, finally only retains the two of input terminal
A signal input interface, and difference is not present in the input interface of two signals, and also just there is no the phenomenon that conducting wire wrong to occur,
Such design not only can solve conducting wire in test and spend the case where mostly occurring misconnection, but also can reduce significantly and entirely to test
Time can be used for teaching demonstration.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is structural schematic diagram of the present invention for the device of time-division division multiplex fibre-optic communication wave experimental teaching；
Fig. 2 is the schematic diagram of transmitting terminal clock 1-1 of the present invention；
Fig. 3 is the schematic diagram of double-channel sampling pulse generation circuit 1-2 of the present invention；
Fig. 4 is the schematic diagram that the present invention first believes modulation circuit 1-3；
Fig. 5 is the schematic diagram of second channel modulation circuit 1-4 of the present invention；
Fig. 6 is the schematic diagram of adder circuit 1-5 of the present invention；
Fig. 7 is the schematic diagram of electro-optical conversion circuit 1-6 of the present invention；
Fig. 8 is the schematic diagram of photoelectric conversion circuit 2-1 of the present invention；
Fig. 9 is the schematic diagram that double-channel sampling pulse of the present invention extracts circuit 2-2；
Figure 10 is the schematic diagram of clock 2-3 in receiving end of the present invention；
Figure 11 is the schematic diagram of double-channel sampling pulse split circuit 2-4 of the present invention；
Figure 12 is the schematic diagram of signal transformation circuit 2-5 of the present invention；
Figure 13 is the schematic diagram that the first channel signal of the invention extracts circuit 2-6；
Figure 14 is the schematic diagram of second channel signal extracting circuit 2-7 of the present invention；
Figure 15 is the schematic diagram of second channel low-pass filter 2-8 of the present invention；
Figure 16 is the schematic diagram of the first channel low pass filter 2-9 of the present invention；
Figure 17 is flow chart of the present invention for the method for time-division division multiplex fibre-optic communication wave experimental teaching；
Figure 18 is structural schematic diagram of the present invention for the system of time-division division multiplex fibre-optic communication wave experimental teaching.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with attached drawing and specifically
Embodiment technical solution of the present invention is described in detail.It should be pointed out that described embodiment is only this hair
Bright a part of the embodiment, instead of all the embodiments, based on the embodiments of the present invention, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
Embodiment 1
As shown in Figure 1, the present invention provides a kind of device for time-division division multiplex fibre-optic communication wave experimental teaching, it is suitable for
Institution of higher learning's communication class profession, comprising:
Signal sending end, generate modulation needed for modulating clock pulse, generate multiple channel frequencies are identical, pulsewidth is different,
Pulse sampling pulse wrong between having synchronizes multiple channel sample pulses, then to multiple channel original signals of input
Pulse width modulation is carried out respectively, modulated multiple Channel Modulation signals is time-multiplexed, then will be after time division multiplexing
Electric signal is converted to the optical signal of different wave length, and the optical signal of different wave length is finally carried out wavelength-division multiplex；
Signal receiving end demultiplexes the signal of wavelength-division multiplex to obtain the optical signal of different wave length, by the light of different wave length
Signal is converted into electric signal, the time division multiplexing electric signal after being demultiplexed, by the time division multiplexing electric signal shaping after demultiplexing
Multiple channel shaping electric signals are obtained, demodulation clock pulse needed for generating demodulation carries out multiple channel shaping electric signals same
Step, extracts that multichannel frequency is identical, pulsewidth is different, pulse wrong demodulation pulse continuously from time division multiplexing electric signal, by multichannel
Demodulate pulse and carry out isolated multiple channels and demodulate pulses, and the demodulation pulse of multiple channels is synchronized, then by synchronizing after
Multiple channels demodulation pulse pair synchronize after multiple channel shaping electric signals demodulation, finally restore the original letter of multiple channels
Number.
The signal sending end includes transmitting terminal clock, and transmitting terminal output terminal of clock connects double-channel sampling pulse and generates electricity
Road input terminal, double-channel sampling pulse the first output end of generation circuit connect first the second input terminal of Channel Modulation circuit, double letters
Road sampling pulse generation circuit second output terminal connects the second input terminal of second channel modulation circuit, the first Channel Modulation circuit the
One input terminal connects the first channel input interface, and second channel modulation circuit first input end connects second channel input interface,
First Channel Modulation circuit output end connects adder circuit input terminal, adder circuit with second channel modulation circuit output end
Output end connects electro-optical conversion circuit input terminal, and electro-optical conversion circuit output end connects WDM wave multiplexer input terminal；
Modulating clock pulse needed for transmitting terminal clock generates modulation, double-channel sampling pulse generation circuit generate frequency phase
First channel sample pulse and second channel sampling pulse same, pulsewidth is different, pulse is wrong between having, by the first channel sample pulse
It is synchronized with second channel sampling pulse, the first Channel Modulation circuit connects the first channel sample pulse and the input of the first channel
The electric signal of mouth is multiplied to obtain the first modulated signal, and second channel modulation circuit is defeated by second channel sampling pulse and second channel
The electric signal of incoming interface is multiplied to obtain the second modulated signal, and the first modulated signal is added by adder circuit with the second modulated signal
It is time-multiplexed to obtain time division multiplexing electric signal, time division multiplexing electric signal obtains the light of different wave length by electro-optical conversion circuit
The optical signal of different wave length is carried out wavelength-division multiplex by signal, last WDM wave multiplexer.
The signal receiving end includes WDM channel-splitting filter, and WDM channel-splitting filter input terminal connects WDM wave multiplexer output end, and WDM divides
Wave device output end connects photoelectric conversion circuit input terminal, photoelectric conversion circuit output end connection signal shaping circuit first input end
Circuit input end is extracted with double-channel sampling pulse, double-channel sampling pulse extracts circuit output end connection signal shaping circuit the
Two input terminals and double-channel sampling pulse split circuit first input end, signal transformation circuit third input terminal and double-channel sampling
The second input terminal of pulse-separating circuit connects receiving end output terminal of clock, and signal transformation circuit output end connects the first channel signal
Extract circuit first input end and second channel signal extracting circuit first input end, double-channel sampling pulse split circuit first
Output end connects the first channel signal and extracts the second input terminal of circuit, the connection of double-channel sampling pulse split circuit second output terminal
The second input terminal of second channel signal extracting circuit, the first channel signal extract circuit output end and connect the first channel low-pass wave
Device input terminal, second channel signal extracting circuit output end are connected to second channel low-pass filter input terminal, and the first channel is low
Bandpass filter output end connects the first channel output interface, and the connection second channel output of second channel first low pass filter output connects
Mouthful；
WDM channel-splitting filter demultiplexes the signal of wavelength-division multiplex to obtain the optical signal of different wave length, and photoelectric conversion circuit will not
The optical signal of co-wavelength is converted into electric signal, the time division multiplexing electric signal after being demultiplexed, and signal transformation circuit will demultiplex
Time division multiplexing electric signal shaping afterwards obtains the first shaping electric signal and the second shaping electric signal, and receiving end clock generates demodulation institute
The demodulation clock pulse needed, the first shaping electric signal and the second shaping electric signal are synchronized, and double-channel sampling pulse extracts
Circuit extracts that double-channel frequency is identical, pulsewidth is different, pulse wrong demodulation pulse continuously from time division multiplexing electric signal, and double-channel is adopted
Double-channel demodulation pulse is carried out isolated first channel demodulation pulse to sample pulse-separating circuit and second channel demodulates pulse,
Receiving end clock demodulates pulse to the first channel and second channel demodulation pulse synchronizes, and the first channel signal extracts circuit will
The first channel demodulation pulse after synchronizing with it is synchronous after the first shaping electric signal be multiplied to obtain the first channel sample electric signal, the
Two channel signals extract circuit will synchronize after second channel demodulation pulse with it is synchronous after the second shaping electric signal be multiplied to obtain
Second channel samples electric signal, and the first channel sample electric signal obtains the first channel telecommunications after the first channel low pass filter
Number, second channel sampling electric signal obtains second channel electric signal, the first channel telecommunications after second channel low-pass filter
Number by the first channel output interface export, second channel electric signal by second channel output interface output.
Clock pulse frequency caused by the transmitting terminal clock and the receiving end clock is not identical.
In order to realize low-power consumption, high-performance this purpose, the present invention realizes that time-multiplexed circuit selection belongs to TTL type
The 74LS series digit logic chip of integrated circuit, with high speed, low consumption, broadband characteristic.Specifically: signal sending end 1
It include: transmitting terminal clock 1-1 (see Fig. 2), double-channel sampling pulse generation circuit 1-2 (see Fig. 3), the first Channel Modulation circuit 1-
3 (see Fig. 4), second channel modulation circuit 1-4 (see Fig. 5), adder circuit 1-5 (see Fig. 6), electro-optical conversion circuit 1-5 are (see figure
7), wherein transmitting terminal clock 1-1 set there are two capacitor C1 and C2, a crystal oscillator Y1, a resistance R1, ten level Four two into
Serial counter U1 processed；Double-channel sampling pulse generation circuit 1-2 set there are two 4 binary counter U3 and U5, one with
NOT gate U2A, two and door U4A and U4B；First Channel Modulation circuit 1-3 is set there are four resistance R2, R3, R4, R5, two polarity
Capacitor C3 and C6, two capacitors C4 and C5, a four-quadrant analog multiplier U6；There are four second channel modulation circuit 1-4 is set
Resistance R6, R8, R10, R11, two polar capacitors C7 and C10, two capacitors C8 and C9, a four-quadrant analog multiplier U7；
Adder circuit 1-5 is equipped with an operational amplifier U8A, a capacitor C11, a resistance R12, and electro-optical conversion circuit 1-5 is set
There are three resistance R13, R15, R16, a potentiometer R14, a triode Q1, a LD laser head D1.
Physical relationship is: the port CLK of transmitting terminal clock 1-1 is connected to the end CLK of double-channel sampling pulse generation circuit 1-2
Mouthful, the port TT1 of double-channel sampling pulse generation circuit 1-2 is connected to the port TT1 of the first Channel Modulation circuit 1-3, double-channel
The port TT2 of sampling pulse generation circuit 1-2 is connected to the port TT2 of second channel modulation circuit 1-4, the first channel input interface
The port MIN1 be connected to the port MIN1 of the first Channel Modulation circuit 1-3, the port MIN2 of second channel input interface is connected to
The port MIN2 of two Channel Modulation circuit 1-4, the port TM of the first Channel Modulation circuit 1-3 and second channel modulation circuit 1-4
The port TM be all connected to the port TM of adder circuit 1-5, the port TMH of adder circuit 1-5 is connected to electro-optical conversion circuit 1-6
The port TMH.
Working principle is: forming 14 grades of binary systems by capacitor C1, capacitor C2, crystal oscillator Y1, resistance R1 in transmitting terminal clock 1-1
The external crystal oscillation circuit of serial counter U1, therefore the clock cycle of the port CLK output is the 2 of external crystal oscillation circuit baseband cycle
^6 times.When the clock signal of 4 binary counters U3 and U5 are all come to transmitting terminal in double-channel sampling pulse generation circuit 1-2
The impulse sampling signal that the port CLK of clock 1-1 generates double-channel sampling pulse generation circuit 1-2 finally has synchronism.
The port ENT of 4 binary counter U3 and 4 binary counter U5, the port the ENP ,~port CLR all connect height
Level is only possible to work and is reading and counting two kinds of working conditions.
The data of " ABCD " access of 4 binary counter U3 are " 0010 ", and " ABCD " of binary counter U5 connects
The data entered are " 1100 ".
4 binary counter U3~3 ports of the port LOAD connection NAND gate U2A, 4 binary counter U3 the
The working condition at n moment is codetermined by the (n-1)th moment of the port QA and QD of 4 binary counter U3,4 binary countings
4 binary counter U5 of the port QC connection of device U3~port LOAD, the work at 4 the n-th moment of binary counter U5
State is determined by the (n-1)th moment of the port QC of 4 binary counter U3.
4 binary counter U3 carry out cycle count to CLK pulse, while generating one with the port TT1 of door U4A
The sampling pulse that period is 6 times of clock cycle, pulsewidth is 1 times of clock cycle；4 binary counter U5 carry out CLK pulse
Cycle count, while a cycle is 6 times of clock cycle, pulsewidth is 3 times of clock cycle generating with the port TT2 of door U4B
Sampling pulse.
It is accessed with the port TT1 of the port TT1 access four-quadrant analog multiplier U6 of door U4A and the port TT2 of door U4B
The port TT2 of four-quadrant analog multiplier U7.It is multiplied respectively with input signal MIN1 and MIN2 and produces modulated signal.
The modulated signal that the modulated signal TM and four-quadrant analog multiplier U7 that four-quadrant analog multiplier U6 is generated are generated
TM accesses the port of operational amplifier U8A simultaneously.The two modulated signals of channel pulse amplitude are overlapped, it is multiple to generate the time-division
Electric signal.
The port TMH for the time division multiplexing electric signal access triode Q1 that operational amplifier U8A is generated, converts optical signals into
Electric signal.
Signal receiving end 2 specifically includes that photoelectric conversion circuit 2-1 (see Fig. 8), sampling pulse extract circuit 2-2 (see figure
9), receiving end clock 2-3 (see Figure 10), double-channel sampling pulse split circuit 2-4 (see Figure 11), signal transformation circuit 2-5 (see
Figure 12), the first channel signal extracts circuit 2-6 (see Figure 13), second channel signal extracting circuit 2-7 (see Figure 14), the first letter
Road low-pass filter 2-8 (see Figure 15), second channel low-pass filter 2-9 (see Figure 16).Wherein: photoelectric conversion circuit 2-1 is set
There are a PIN photodiode D1, an operational amplifier U9, a potentiometer R17；Sampling pulse extracts circuit 2-2 and is equipped with
One potentiometer R18, a comparator U10A, a resistance R1；Receiving end clock 2-3 sets that there are two capacitor C12 and C13, one
A crystal oscillator Y1, a resistance R20, a ten level Four binary system serial counter U11；Double-channel sampling pulse split circuit 2-4
Equipped with 4 binary counter U12, a NAND gate U14A, a double rising d type flip flop U13A；Signal transformation circuit
2-5 be equipped with 4 binary counter U15, one with door U16A, a four-quadrant analog multiplier U17, four resistance R21,
R22, R23, R24, two polar capacitors C14 and C17, two capacitors C15 and C16；First channel signal extracts circuit 2-6 and is equipped with
One four-quadrant analog multiplier U18, four resistance R25, R26, R27, R28, two polar capacitors C18 and C21, two capacitors
C19 and C20；Second channel signal extracting circuit 2-7 be equipped with a four-quadrant analog multiplier U19, four resistance R25, R26,
R27, R28, two polar capacitors C22 and C25, two capacitors C23 and C24；First channel low pass filter 2-8 is transported there are three setting
Calculate amplifier U20A, U20B, U20C, six resistance R33, R34, R35, R36, R37, R39, a potentiometer R38, four capacitors
C26,C27,C28,C29；Second channel low-pass filter 2-9 is set there are three operational amplifier U21A, U21B, U21C, six electricity
Hinder R40, R41, R42, R43, R44, R46, a potentiometer 45, four capacitors C30, C31, C32, C33.
Physical relationship is: the port MM of photoelectric conversion circuit 2-1 is connected to the port MM and the letter that sampling pulse extracts circuit 2-2
The port MM of number shaping circuit 2-5, the port 1CLK that sampling pulse extracts circuit 2-2 are connected to double-channel sampling pulse split circuit
The t1 port of the port 1CLK of 2-4 and the port 1CLK of signal transformation circuit 2-5, double-channel sampling pulse split circuit 2-4 connects
The t1 port of circuit 2-6 is extracted to the first channel signal, the port T2 of double-channel sampling pulse split circuit 2-4 is connected to the second letter
The port T2 of road signal extracting circuit 2-7, the port TMM1 that the first channel signal extracts circuit 2-6 are connected to the first channel low-pass
The port TMM1 of wave device 2-8, the port TMM2 of second channel signal extracting circuit 2-7 are connected to second channel low-pass filter 2-9
The port TMM2, the port CLK2 of receiving end clock 2-3 is connected to the port CLK2 and the letter of double-channel sampling pulse split circuit 2-4
The port CLK2 of number shaping circuit 2-5, the port MM2 of signal transformation circuit 2-5 are connected to the first channel signal and extract circuit 2-6's
The port MM2 of the port MM2 and second channel signal extracting circuit 2-7.
Working principle is: after photoelectric conversion circuit 2-1 receives the optical signal of optical fiber link transmission, by two pole of PIN photoelectricity
Pipe D1 converts optical signals into time-multiplexed electric signal, and operational amplifier U9 forms voltage follower circuit and provides subsequent conditioning circuit foot
Enough signal voltages；
The port MM of the port the MM access comparator U10A of operational amplifier U9, the electric signal that is time-multiplexed is in comparator U10A
In compared with the threshold voltage of potentiometer R18, thus extract time division multiplexing electric signal in sampling pulse signal.
14 grades of binary serials are formed by capacitor C12, capacitor C13, crystal oscillator Y1, resistance R20 in the clock 2-3 of receiving end to count
The external crystal oscillation circuit of device U1, therefore the clock cycle of the port CLK2 output is 2^5 times of external crystal oscillation circuit baseband cycle.It is double
4 binary counters in 4 binary counter U12 and signal transformation circuit 2-5 in channel sample pulse-separating circuit 2-4
The clock signal of U15 all comes to receiving end clock to believe the port CLK2 of 2-3, so that double-channel sampling pulse split circuit 2-4
T1 has synchronous with the reshaping signal that the port MM2 of the sampling pulse signal that the port T2 generates and signal transformation circuit 2-5 generate
Property.
The port ENT of 4 binary counter U12 and 4 binary counter U15, the port the ENP ,~port CLR all connect
High level is only possible to work and is reading and counting two kinds of working conditions.
The data of " ABCD " access of 4 binary counter U12 are " 0010 ", " ABCD " of binary counter U15
The data of access are " 1110 ".
4 binary counter U12~port 1CLK of the port LOAD connection comparator U10A, 4 binary countings
The working condition at the n-th moment of device U12 determines by the (n-1)th moment of the port 1CLK of comparator U10A, 4 binary counter U15
~port 1CLK of the port LOAD comparator U10A, the working condition at 4 the n-th moment of binary counter U15 is by comparator
The (n-1)th moment of the port 1CLK of U10A determines.
4 binary counter U12 carry out cycle count to CLK pulse, while generating one in 3 ports of NAND gate U14A
A modulated signal, the modulated signal period is 12 times of clock cycle, high level includes adjacent two nearest risings in signal 1CLK
Edge；4 binary counter U15 carry out cycle count to CLK pulse, while generating a modulation with 3 ports of door U16A
Signal, the modulated signal period be 12 times of clock cycle, than pulse each in 1CLK rise the time it is t few (0 < t < T clock period)
Deadline is identical.
Double ports T1 and T2 for rising d type flip flop U13A export reversed two paths of signals, and low and high level is believed with 1CLK
Rising edge in number and change (it is reversed that T1 and the level of the port T2 occur for the rising edge of 1CLK).
8 ports of four-quadrant analog multiplier U17 receive the modulated signal generated with 3 ports of door U16A, by the modulation
The signal multiplication of the port MM for the operational amplifier U9 that signal and the port MM receive obtains the signal of port MM2.
The t1 port of four-quadrant analog multiplier U18 receives the signal of the t1 port of double rising edge d type flip flop U13A, by this
The signal multiplication of the port MM2 for the four-quadrant analog multiplier U17 that modulated signal and the port MM2 receive obtains port TMM1's
Signal；The port T2 of four-quadrant analog multiplier U19 receives the signal of the port T2 of double rising edge d type flip flop U13A, by the tune
The signal multiplication of the port MM2 for the four-quadrant analog multiplier U17 that signal processed and the port MM2 receive obtains the letter of port TMM2
Number.
The signal of the port TMM1 of the received TMM1 four-quadrant analog multiplier U18 of operational amplifier U20A, by the signal
The first channel original signal is restored after low-pass filtering；The received TMM2 four-quadrant analog multiplier of operational amplifier U21A
The signal is restored second channel original signal by the signal of the port TMM9 of U19 after low-pass filtering.
In conclusion the invention proposes the circuits that the device of a kind of time division multiplexing and wavelength-division multiplex is implemented.With it is existing
Technology is compared, the invention has the advantages that (1) present invention generate modulation and demodulation pulse method can be applied to it is most of this
Class system；(2) present invention contains the sampling of analog signal, the verifying of sampling theorem, and pulse-amplitude modulation and demodulation, time-division are more
Road multiplexing and demultiplexing, the foundation of data frame, the knowledge points such as detection of pulse width；(3) present invention time division multiplexing receiving end
Pulse is demodulated by modulated signal triggering and modulated signal influences, frequency is identical, pulsewidth is different, wrong to reduce between pulse zero-clearance
Demodulating error；(4) present system is complete, and student can establish the communication system of oneself according to oneself to the understanding of knowledge point；
(5) various pieces modularization of the present invention, at low cost convenient for teaching, later period maintenance is convenient.
The present invention does not need excessive data-interface, effectively can avoid student during testing, due to connecing
It makes a slip of the tongue and causes conducting wire wrong position more, lead to not correctly make experimental result；And most of students test for the first time
During can not reach very deep understanding to the operation of experiment and principle, if occurring excessive mistake during experiment
Its enthusiasm can be seriously affected.The signal input interface of input terminal is not present difference, and the input signals of two kinds of different frequencies can be with
Any access, can obtain correct experimental result.
The present invention provide it is a kind of based on the design of full non-programmed chip for the experimental teaching of time-division division multiplex fibre-optic communication wave
Device, this device circuit definite functions, it is convenient for safeguarding, convenient for student debugging, application it is strong, more can intuitively show number
According to the process of transmission and processing, it is very suitable for making student be more clear signal in entire multiplex process for Experimental Teaching Courses
In situation of change, deepen the study and research of theoretical course.
In transmitting terminal clock 1-1 (see Fig. 2) of the present invention, receiving end clock 2-3 (see Figure 10), Q4--Q14 pin respectively can
To generate the clock signal of different frequencys multiplication, therefore the clock signal that switching circuit is used to select different frequency can be accessed, realized
Experiment is improved in the case where not changing experimental provision wiring.
Embodiment 2
As shown in figure 17, the present invention also provides a kind of method for time-division division multiplex fibre-optic communication wave experimental teaching, packets
It includes:
S1, generate modulation needed for modulating clock pulse, generate between multiple channel frequencies are identical, pulsewidth is different, pulse has
Wrong sampling pulse, multiple channel sample pulses are synchronized；
S2, pulse width modulation is carried out respectively to multiple channel original signals of input, by modulated multiple channel tune
Signal processed is time-multiplexed；
S3, the optical signal that the electric signal after time division multiplexing is converted to different wave length, then by the optical signal of different wave length
Carry out wavelength-division multiplex；
S4, the signal of wavelength-division multiplex is demultiplexed to obtain the optical signal of different wave length, the optical signal of different wave length is converted
At electric signal, time division multiplexing electric signal after being demultiplexed is obtained the time division multiplexing electric signal shaping after demultiplexing multiple
Channel shaping electric signal；
S5, the required demodulation clock pulse of demodulation is generated, multiple channel shaping electric signals is synchronized；
S6, extract that multichannel frequency is identical, pulsewidth is different, pulse wrong demodulation pulse continuously from time division multiplexing electric signal,
Multiple channel demodulation pulse is subjected to isolated multiple channels and demodulates pulse, and the demodulation pulse of multiple channels is synchronized；
S7, again by after synchronizing multiple channels demodulation pulse pair synchronize after multiple channel shaping electric signals demodulate, finally
Restore multiple channel original signals.
The present invention provide it is a kind of based on the design of full non-programmed chip for the experimental teaching of time-division division multiplex fibre-optic communication wave
Method, enable to complete to carry out multiple signals pulse amplitude modulation, time division multiplexing, multiple signals wavelength-division after time division multiplexing
Multiplexing, the foundation of data frame, the detection of pulse width, sampled signal extraction and signal sampling etc. can reach principle and reality
It tramples and combines, the grasp that the whole process for allowing student's more intuitive understanding to communicate facilitates student to knowledge point, and the religion
It is obvious to learn the EM equipment module division of labor, is convenient for later maintenance and teaching demonstration.
Embodiment 3
As shown in figure 18, the present invention also provides a kind of system for time-division division multiplex fibre-optic communication wave experimental teaching, packets
At least one described signal sending end and the signal receiving end equal with signal sending end quantity of side user terminal are included, also
The signal sending end and the signal equal with the signal sending end quantity of side user terminal including other side user terminal
First signal sending end of receiving end, side user terminal connects the first photo-coupler, side user terminal by the first optoisolator
The first signal receiving end by the second optoisolator connect the first photo-coupler, the first photo-coupler connect the first wavelength-division multiplex
The second signal transmitting terminal of device, other side user terminal connects the second photo-coupler, other side user terminal by third optoisolator
Second signal receiving end by the 4th optoisolator connect the second photo-coupler, the second photo-coupler connect the second wavelength-division multiplex
Device, the first wavelength division multiplexer are connect by optical fiber with the second wavelength division multiplexer.
S is signal sending end 1, and R is signal receiving end 2, and it is multiple that signal sending end 1 and signal receiving end 2 form a set of time-division
With either simplex double-channel communication experiment system.A set of time division multiplexing either simplex double-channel communication experiment system is the laser of λ with certain wavelength
It is transmitted by optical fiber.When n set (n >=2) single channel time division multiplexing either simplex double-channel fiber optic communication experimental system wavelength division multiplexer is n
It is transmitted after the multiplexing of road Sampled optical signals and then constitutes time division multiplexed wavelength-division hybrid multiplex either simplex fiber optic communication experimental system, finally,
The present invention increases photo-coupler and optoisolator to realize that multichannel full duplex signaling transmits in an optical fiber, and as multichannel is entirely double
Work fiber optic communication experimental system.Namely for the system of time-division division multiplex fibre-optic communication wave experimental teaching.
Compared with prior art, beneficial effects of the present invention are as follows:
1), present invention ensures that modulated signal can be stable addition, reduce error；
2), the present invention proposes that the demodulation pulse of receiving end (is simulated actual by the time multiplexing signal triggering after shaping
Communication system) method, demodulating same mutually restrict between pulse ensures accurately to demodulate；
3), the present invention is applied to the sampling of analog signal, pulse-amplitude modulation and demodulation, time division multiplexing with demultiplex
With the foundation of data frame, the detection of pulse width, the knowledge points such as Wave division multiplexing and demultiplexing are deepened the theoretical of student and learned
It practises, improves the meaning of experiment；
4) present invention uses non-programmed logical device completely, can set multiple groups sensing point, to clock signal, debugging pulse, adjusts
Signal processed, time multiplexing signal, demodulation pulse, demodulated signal etc. compare；
5), the present invention is combined by being time-multiplexed with wavelength-division multiplex, keeps system more perfect；
6), the present invention can apply in a variety of time-multiplexed systems, and double-channel high quality, low error rate may be implemented
Effective transmission；
7), the present invention reduces unnecessary line during circuit design, finally only retains the two of input terminal
A signal input interface, and difference is not present in the input interface of two signals, and also just there is no the phenomenon that conducting wire wrong to occur,
Such design not only can solve conducting wire in test and spend the case where mostly occurring misconnection, but also can reduce significantly and entirely to test
Time can be used for teaching demonstration.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (6)
1. a kind of device for time-division division multiplex fibre-optic communication wave experimental teaching characterized by comprising
Signal sending end, modulating clock pulse needed for generating modulation, generates that multiple channel frequencies are identical, pulsewidth is different, pulse
Wrong sampling pulse between having synchronizes multiple channel sample pulses, then distinguishes multiple channel original signals of input
Pulse width modulation is carried out, modulated multiple Channel Modulation signals are time-multiplexed, then by the telecommunications after time division multiplexing
The optical signal of different wave length number is converted to, the optical signal of different wave length is finally subjected to wavelength-division multiplex；
Signal receiving end demultiplexes the signal of wavelength-division multiplex to obtain the optical signal of different wave length, by the optical signal of different wave length
It is converted into electric signal, the time division multiplexing electric signal after being demultiplexed obtains the time division multiplexing electric signal shaping after demultiplexing
Multiple channel shaping electric signals, demodulation clock pulse needed for generating demodulation, multiple channel shaping electric signals are synchronized, from
The electric signal that is time-multiplexed extracts that multichannel frequency is identical, pulsewidth is different, pulse wrong demodulation pulse continuously, by multiple channel demodulation arteries and veins
The isolated multiple channel demodulation pulses of row are rushed in, and the demodulation pulse of multiple channels are synchronized, then by multiple after synchronizing
Multiple channel shaping electric signals after channel demodulation pulse pair synchronizes demodulate, and finally restore multiple channel original signals.
2. being used for the device of time-division division multiplex fibre-optic communication wave experimental teaching as described in claim 1, which is characterized in that described
Signal sending end includes transmitting terminal clock, and transmitting terminal output terminal of clock connects double-channel sampling pulse generation circuit input terminal, double
The first output end of channel sample pulse-generating circuit connects first the second input terminal of Channel Modulation circuit, and double-channel sampling pulse produces
Raw circuit second output terminal connects the second input terminal of second channel modulation circuit, the connection of the first Channel Modulation circuit first input end
First channel input interface, second channel modulation circuit first input end connect second channel input interface, the first Channel Modulation
Circuit output end connects adder circuit input terminal, adder circuit output end connection electricity with second channel modulation circuit output end
Light conversion circuit input terminal, electro-optical conversion circuit output end connect WDM wave multiplexer input terminal；
Transmitting terminal clock generate modulation needed for modulating clock pulse, double-channel sampling pulse generation circuit generate frequency it is identical,
The the first channel sample pulse and second channel sampling pulse that pulsewidth is different, pulse is wrong between having, by the first channel sample pulse and
Second channel sampling pulse synchronizes, and the first Channel Modulation circuit is by the first channel sample pulse and the first channel input interface
Electric signal be multiplied to obtain the first modulated signal, second channel modulation circuit inputs second channel sampling pulse and second channel
The electric signal of interface is multiplied to obtain the second modulated signal, and adder circuit mutually adds the first modulated signal with the second modulated signal
Row time division multiplexing obtains time division multiplexing electric signal, and time division multiplexing electric signal obtains the light letter of different wave length by electro-optical conversion circuit
Number, the optical signal of different wave length is carried out wavelength-division multiplex by last WDM wave multiplexer.
3. being used for the device of time-division division multiplex fibre-optic communication wave experimental teaching as claimed in claim 2, which is characterized in that described
Signal receiving end includes WDM channel-splitting filter, and WDM channel-splitting filter input terminal connects WDM wave multiplexer output end, and WDM channel-splitting filter output end connects
Connect photoelectric conversion circuit input terminal, photoelectric conversion circuit output end connection signal shaping circuit first input end and double-channel sampling
Pulse extraction circuit input terminal, double-channel sampling pulse extract the second input terminal of circuit output end connection signal shaping circuit and double
Channel sample pulse-separating circuit first input end, signal transformation circuit third input terminal and double-channel sampling pulse split circuit
Second input terminal connects receiving end output terminal of clock, and signal transformation circuit output end connects the first channel signal and extracts circuit first
Input terminal and second channel signal extracting circuit first input end, double-channel sampling pulse the first output end of split circuit connection the
One channel signal extracts the second input terminal of circuit, and double-channel sampling pulse split circuit second output terminal connects second channel signal
The second input terminal of circuit is extracted, the first channel signal extracts circuit output end and connects the first channel low pass filter input terminal, the
Two channel signals extract circuit output end and are connected to second channel low-pass filter input terminal, the output of the first channel low pass filter
The first channel output interface of end connection, second channel first low pass filter output connect second channel output interface；
WDM channel-splitting filter demultiplexes to obtain the optical signal of different wave length to the signal of wavelength-division multiplex, and photoelectric conversion circuit is by different waves
Long optical signal is converted into electric signal, and the time division multiplexing electric signal after being demultiplexed, signal transformation circuit will be after demultiplexing
Time division multiplexing electric signal shaping obtains the first shaping electric signal and the second shaping electric signal, and receiving end clock generates needed for demodulation
Demodulation clock pulse synchronizes the first shaping electric signal and the second shaping electric signal, and double-channel sampling pulse extracts circuit
Extract that double-channel frequency is identical, pulsewidth is different, pulse wrong demodulation pulse continuously from time division multiplexing electric signal, double-channel samples arteries and veins
It rushes split circuit and double-channel demodulation pulse is subjected to isolated first channel demodulation pulse and second channel demodulation pulse, receive
End clock demodulates pulse to the first channel and second channel demodulation pulse synchronizes, and the first channel signal extracts circuit and will synchronize
The first channel demodulation pulse afterwards with it is synchronous after the first shaping electric signal be multiplied to obtain the first channel sample electric signal, second believes
Road signal extracting circuit will synchronize after second channel demodulation pulse with it is synchronous after the second shaping electric signal be multiplied to obtain second
Channel sample electric signal, the first channel sample electric signal obtain the first channel electrical signal after the first channel low pass filter,
Second channel sampling electric signal obtains second channel electric signal, the first channel electrical signal warp after second channel low-pass filter
The output of the first channel output interface is crossed, second channel electric signal is exported by second channel output interface.
4. being used for the device of time-division division multiplex fibre-optic communication wave experimental teaching as claimed in claim 3, which is characterized in that described
Clock pulse frequency caused by transmitting terminal clock and the receiving end clock is not identical.
5. a kind of method for time-division division multiplex fibre-optic communication wave experimental teaching characterized by comprising
S1, generate modulation needed for modulating clock pulse, generate wrong between multiple channel frequencies are identical, pulsewidth is different, pulse has
Sampling pulse synchronizes multiple channel sample pulses；
S2, pulse width modulation is carried out to multiple channel original signals of input respectively, modulated multiple Channel Modulations are believed
It number is time-multiplexed；
Then S3, the optical signal that the electric signal after time division multiplexing is converted to different wave length carry out the optical signal of different wave length
Wavelength-division multiplex；
S4, the signal of wavelength-division multiplex is demultiplexed to obtain the optical signal of different wave length, the optical signal of different wave length is converted into electricity
Time division multiplexing electric signal shaping after demultiplexing is obtained multiple channels by signal, the time division multiplexing electric signal after being demultiplexed
Shaping electric signal；
S5, the required demodulation clock pulse of demodulation is generated, multiple channel shaping electric signals is synchronized；
S6, extract that multichannel frequency is identical, pulsewidth is different, pulse wrong demodulation pulse continuously from time division multiplexing electric signal, it will be more
Channel demodulates pulse and carries out isolated multiple channel demodulation pulses, and synchronizes to the demodulation pulse of multiple channels；
S7, again by after synchronizing multiple channels demodulation pulse pair synchronize after multiple channel shaping electric signals demodulate, finally restore
Multiple channel original signals out.
6. a kind of system for time-division division multiplex fibre-optic communication wave experimental teaching, which is characterized in that including side user terminal
At least one is such as signal sending end in any described device of claim 1-4 and equal with signal sending end quantity such as right
It is required that the signal receiving end in any described device of 1-4, further include other side user terminal at least one as claim 1-4 appoints
The signal sending end equal with the signal sending end quantity of side user terminal and the signal in one described device receive
End, the first signal sending end of side user terminal connect the first photo-coupler by the first optoisolator, and the of side user terminal
One signal receiving end connects the first photo-coupler by the second optoisolator, and the first photo-coupler connects the first wavelength division multiplexer,
The second signal transmitting terminal of other side user terminal connects the second photo-coupler by third optoisolator, and the of other side user terminal
Binary signal receiving end connects the second photo-coupler by the 4th optoisolator, and the second photo-coupler connects the second wavelength division multiplexer,
First wavelength division multiplexer is connect by optical fiber with the second wavelength division multiplexer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710534791.XA CN107317650B (en) | 2017-07-03 | 2017-07-03 | Device, method and system for experimental teaching of time division wavelength division multiplexing optical fiber communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710534791.XA CN107317650B (en) | 2017-07-03 | 2017-07-03 | Device, method and system for experimental teaching of time division wavelength division multiplexing optical fiber communication |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107317650A CN107317650A (en) | 2017-11-03 |
| CN107317650B true CN107317650B (en) | 2019-04-19 |
Family
ID=60180570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710534791.XA Expired - Fee Related CN107317650B (en) | 2017-07-03 | 2017-07-03 | Device, method and system for experimental teaching of time division wavelength division multiplexing optical fiber communication |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107317650B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769782A (en) * | 2017-11-06 | 2018-03-06 | 长沙曙通信息科技有限公司 | A kind of new type multipath multiplexed analog digit transducer device |
| CN108680578B (en) * | 2018-03-14 | 2020-08-04 | 西安工业大学 | Multi-spectral frequency division multiplexing detection system and method |
| CN108599867B (en) * | 2018-03-29 | 2021-02-02 | 上海交通大学 | Optical digital signal receiving device based on waveform matching |
| CN110445547B (en) * | 2019-09-17 | 2024-06-28 | 成都芯瑞科技股份有限公司 | Circuit for transmitting pulse signals with adjustable width by utilizing optical fibers |
| CN111127986B (en) * | 2020-01-10 | 2024-09-24 | 华南师范大学 | Device and method for time division wavelength division multiplexing optical fiber digital communication experiment teaching |
| CN113726432B (en) * | 2021-08-30 | 2023-04-14 | 桂林电子科技大学 | A software-definable visible light adaptive modulation and demodulation device and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6256124B1 (en) * | 1998-05-08 | 2001-07-03 | All Optical Networks, Inc. | Combination photonic time and wavelength division multiplexer |
| CN101715153A (en) * | 2009-12-02 | 2010-05-26 | 华中科技大学 | Hybrid wavelength-division and time-division multiplexing passive sensing optical network |
| CN102840875A (en) * | 2012-09-10 | 2012-12-26 | 中国科学院半导体研究所 | Sensor multiplexing system based on phase-shifted fibre Bragg grating |
| CN103488023A (en) * | 2013-09-18 | 2014-01-01 | 上海交通大学 | High-precision optical analog-digital converter |
| CN204597973U (en) * | 2015-05-13 | 2015-08-26 | 华南师范大学 | Optical fiber communication experimental optical receiver module |
| CN204597972U (en) * | 2015-05-13 | 2015-08-26 | 华南师范大学 | Optical fiber communication experimental optical sending module |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103873182B (en) * | 2014-03-13 | 2016-06-29 | 华南师范大学 | A kind of wavelength-division multiplex Digital Communication Experiment teaching system |
-
2017
- 2017-07-03 CN CN201710534791.XA patent/CN107317650B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6256124B1 (en) * | 1998-05-08 | 2001-07-03 | All Optical Networks, Inc. | Combination photonic time and wavelength division multiplexer |
| CN101715153A (en) * | 2009-12-02 | 2010-05-26 | 华中科技大学 | Hybrid wavelength-division and time-division multiplexing passive sensing optical network |
| CN102840875A (en) * | 2012-09-10 | 2012-12-26 | 中国科学院半导体研究所 | Sensor multiplexing system based on phase-shifted fibre Bragg grating |
| CN103488023A (en) * | 2013-09-18 | 2014-01-01 | 上海交通大学 | High-precision optical analog-digital converter |
| CN204597973U (en) * | 2015-05-13 | 2015-08-26 | 华南师范大学 | Optical fiber communication experimental optical receiver module |
| CN204597972U (en) * | 2015-05-13 | 2015-08-26 | 华南师范大学 | Optical fiber communication experimental optical sending module |
Non-Patent Citations (1)
| Title |
|---|
| 基于CPLD的光纤通信实验编码发送模块;林俊宇等;《光通信技术》;20151130;33-36 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107317650A (en) | 2017-11-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107317650B (en) | Device, method and system for experimental teaching of time division wavelength division multiplexing optical fiber communication | |
| CN102820964B (en) | Method for aligning multichannel data based on system synchronizing and reference channel | |
| CN104113740A (en) | Mixed format signal optical fiber transmission device | |
| CN101874379B (en) | Bit identification circuit | |
| CN106406174B (en) | A kind of multimode multichannel collecting synchronization system and working method | |
| CN103763085B (en) | Method and device for high-speed acquisition and combination of multi-path data | |
| CN103513276A (en) | A synchronization system and a synchronization method for a micro-electro-mechanical seismic acquisition system | |
| CN105572516A (en) | Multifunctional FPGA acquisition unit with time reference output | |
| CN100530259C (en) | Power system data transmission device | |
| CN102255683B (en) | Clock recovery method for high-speed optical time-division multiplexing system | |
| Li et al. | Design of a general hardware in the loop underwater communication emulation system | |
| CN105450324A (en) | ONU-end time synchronization method and apparatus of XG-PON1 system | |
| CN104660470A (en) | Device and method for detecting Rapid IO bus protocol | |
| CN100388651C (en) | A 40G optical transmission system bit error rate detection method and apparatus | |
| CN109688371A (en) | A kind of control method of the sound source processing system based on acoustic sensor array and image recognition | |
| CN100364197C (en) | Transmission synchronization method of current differential relaying device | |
| CN202003036U (en) | Mine transient electromagnetic instrument | |
| CN109885515A (en) | A kind of realization method and system of bit wide transformation | |
| CN209028205U (en) | A kind of underwater multi-channel high-speed low delay data transmission device of sonar | |
| CN103888211B (en) | A kind of method and device carried out data transmission between cross chips | |
| CN103401747B (en) | A kind of distributed floating controller Local network communication system | |
| CN106019395B (en) | A kind of electrical method receiving processing system and its method based on Correlation Identification | |
| CN109302238A (en) | A kind of smooth I/Q modulator parameter adjusting method and system | |
| CN203310898U (en) | Optical communication data acquisition module | |
| CN107306137A (en) | A kind of high-speed sampler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190419 Termination date: 20190703 |