CN107919915B - Multichannel NRZ optical signal turns the optical fiber telecommunications system and method for the more level optical signals of single channel - Google Patents
Multichannel NRZ optical signal turns the optical fiber telecommunications system and method for the more level optical signals of single channel Download PDFInfo
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- CN107919915B CN107919915B CN201711385821.1A CN201711385821A CN107919915B CN 107919915 B CN107919915 B CN 107919915B CN 201711385821 A CN201711385821 A CN 201711385821A CN 107919915 B CN107919915 B CN 107919915B
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- 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
- H04B10/54—Intensity modulation
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- 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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
- H04B10/25891—Transmission components
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Abstract
The invention discloses optical fiber telecommunications systems and method that a kind of multichannel NRZ optical signal turns the more level optical signals of single channel, are related to optical communication field.N number of light intensity modulation module in the system for the NRZ digital electric signal that the road N rate is R to be modulated to the different NRZ optical signal of the road N wavelength, and is input in multipath light signal coupled apparatus by optical delay line；Multipath light signal coupled apparatus is transmitted for making the road N NRZ optical signal while entering same optical fiber link；The decoupling device of multipath light signal, for the NRZ optical signal in optical fiber link to be divided into the road N NRZ optical signal；1:N single mode photo-coupler, for the road N NRZ optical signal to be input to photodetector；Photodetector, for exporting the electric signal of a Multilevel modulation.Existing NRZ light intensity modulation module can be rationally applied in Multilevel modulation system by the present invention, not only reduce cost, and avoid the waste of resource, economic and practical.
Description
Technical field
The present invention relates to optical communication fields, are specifically a kind of multichannel NRZ (Non return to zero, non-return-to-zero)
Optical signal turns the optical fiber telecommunications system and method for the more level optical signals of single channel.
Background technique
With internet, cloud computing, the fast development of mobile broadband, data center, network transmission bandwidth demand presents quick-fried
Fried formula increases, and pushes the development of vast capacity optical transmission system.In order to promote the capacity of existing optical transmission system, wavelength-division multiplex
Technology, digital coherent receive and the key technologies such as low noise light amplification are considered as that hoist capacity efficiently solves scheme.?
In terms of long range backbone network, from the end of the eighties in last century after wavelength-division multiplex technique is introduced into fiber optic communication field, single mode optical fiber
Single fiber transmission capacity is just doubled and redoubled.Only in nearest 15 years, the single mode optical fiber single fiber transmission capacity obtained in laboratory just from
10Tbit/s is rapidly spread to more than 100Tbit/s.In terms of practical commercial system, commercial single channel on a large scale at present
The full configuration of 100G DWDM (Dense Wavelength Division Multiplexing, dense wave division multipurpose) Transmission system
Channel quantity alreadys exceed 180 waves, and total capacity is close to the 20Tbit/s order of magnitude.With next-generation single channel 400G/1T optical transport
The development of technology, commercial backbone network single fiber transmission capacity will also be close to or up to the 100Tbit/s order of magnitude (single mode optical fiber reason quickly
By transmission limit).
On the other hand, opposite, traditional short-distance transmission net is reformed with the megatechnics of backbone technology
Network (including access and short distance Metropolitan Area Network (MAN)) technological innovation is slower, has faced increasing carrying pressure.Especially with cloud
Calculate, internet+, that Internet of Things etc. for a series of new big data business of representative builds service provider largely is super
Data center, and a large amount of short distance, high-speed, low is required inside data center and between data center and data center
Energy consumption and the controllable optical interconnection technology of cost are used to support the interaction data of increasingly magnanimity.Since last year, country mentions again
" broadband China strategy " requires to arrive the year two thousand twenty out, and the city broadband user access rate that be averaged reaches 50M, and Rural Broadband user is averaged
Rate reaches 10M, and 100% administrative village must all realize fiber broadband bilateral construction.More and more scene demands and
Business feature, so that existing straight with inexpensive OOK (on-off keying, on-off switch keying) double level light intensity modulations
Short distance optical fiber transmission technique based on inspection technology can not cope with.Industry is badly in need of novel short distance optical fiber transmission technique
Meet following needs with framework.
In recent years, it is with PAM-4 (4level pulse amplitude modulation, the modulation of 4 level pulse amplitudes)
Main more level light intensity modulation formats, are applied to short distance optical fiber transmission field, and rapidly become mainstream.But more level light
Intensity modulated format is higher to the linearity of transmitting terminal driving element, it is therefore desirable to higher cost, and it is original a large amount of
The NRZ light intensity modulation module produced can not be applied in Multilevel modulation system, form the significant wastage of resource.
Summary of the invention
The purpose of the invention is to overcome the shortcomings of above-mentioned background technique, a kind of multichannel NRZ optical signal is provided and turns single channel
Existing NRZ light intensity modulation module can be rationally applied to more level by the optical fiber telecommunications system and method for more level optical signals
In modulating system, cost is not only reduced, and avoids the waste of resource, it is economic and practical.
To achieve the above objectives, it is logical to provide a kind of optical fiber that multichannel NRZ optical signal turns the more level optical signals of single channel by the present invention
Letter system, the system include N number of adjustable transmitting optical power and modulate the light intensity modulation module of extinction ratio, multipath light signal coupling
The photodetector of the decoupling device of clutch part, multipath light signal, 1:N single mode photo-coupler and linear response, N are greater than 1
Natural number；
N number of light intensity modulation module, for the NRZ digital electric signal that the independent rate in the road N is R to be modulated to the road N wavelength
On different NRZ optical signals, and the road N NRZ optical signal is input in multipath light signal coupled apparatus by N number of optical delay line, R
For positive integer；
Multipath light signal coupled apparatus is transmitted for making the road N NRZ optical signal while entering in the same optical fiber link；
The decoupling device of multipath light signal is believed for the NRZ optical signal in optical fiber link to be divided into the independent road N NRZ light
Number；
1:N single mode photo-coupler, for the road N NRZ optical signal to be input to photodetector；
Photodetector carries all tune of the road N NRZ optical signal for exporting the electric signal of a Multilevel modulation
Information processed, modulation level number are 2N.
Based on the above technical solution, the independent rate in the road N is that the NRZ digital electric signal of R is same in the time domain
It walks but data is uncorrelated；NRZ data entrained by the different NRZ optical signal of the road N wavelength synchronize in the time domain, and N number of wave
Minimum frequency space between length is greater than the reception electricity bandwidth of photodetector.
Based on the above technical solution, the Output optical power of N number of light intensity modulation module is consistent；N number of luminous intensity tune
The extinction ratio of molding block is successively successively decreased.
Based on the above technical solution, the light intensity modulation module selects directly modulated lasers DML, electric absorption light tune
Device or Mach-Zehnder modulator MZM processed.
Based on the above technical solution, the photodetector select balance optical detector, single-ended optical detector or
Optical-electronic demodulator.
Based on the above technical solution, the optical fiber link is general single mode fiber link, single mode multi-core optical fiber chain
Road or less fundamental mode optical fibre link；The multipath light signal coupled apparatus, the decoupling device of multipath light signal are used according to system
Optical fiber link is selected.
Based on the above technical solution, when the optical fiber link used is general single mode fiber link, the multichannel
Optical signal coupling device part selects photo-coupler or light wavelength division multiplexing, and receiving end signal directly input photodetector without
To pass through the decoupling device of multipath light signal and 1:N single mode photo-coupler.
Based on the above technical solution, when the optical fiber link used is single mode multi-core optical fiber link, the multichannel
Optical signal coupling device part selects single mode multicore fan-in device, and the decoupling device of multipath light signal selects single mode multicore to be fanned out to device
Part.
Based on the above technical solution, when the optical fiber link used is less fundamental mode optical fibre link, the multichannel light letter
Number coupled apparatus selects Mode Coupling device, and the decoupling device of multipath light signal selects the decoupling device of mode.
The optical fiber of the present invention also provides a kind of multichannel NRZ optical signal based on above system turns more level optical signals of single channel is logical
Letter method, comprising the following steps:
A, the NRZ digital electric signal that the independent rate in the road N is R is separately input into N number of light intensity modulation module, it is N number of
The road N NRZ digital electric signal is modulated on the entirely different NRZ optical signal of the road N wavelength by light intensity modulation module respectively；And pass through
The road N NRZ optical signal is input in multipath light signal coupled apparatus by N number of optical delay line；Multipath light signal coupled apparatus makes the road N
NRZ optical signal enters in the same optical fiber link simultaneously to be transmitted；
B, the NRZ optical signal in optical fiber link is again split into the independent road N after the decoupling device of multipath light signal
NRZ optical signal；The road the N NRZ optical signal is input to photodetector after 1:N single mode photo-coupler；Photodetector output
The electric signal of one Multilevel modulation, carries all modulation intelligences of the road N NRZ optical signal, and modulation level number is 2N。
The beneficial effects of the present invention are:
(1) compared with prior art, the very low NRZ light intensity modulation module of use cost of the present invention constitutes electric more than one
The modulator of zero diopter signal has saved certain cost, while benefit so that substantially reducing to the linearity of transmitting terminal modulator
With mature module, it is not necessary to which new more level sending modules of redeveloping further reduced use cost.Also, it will
Original NRZ light intensity modulation module largely produced is rationally applied in Multilevel modulation system, can effectively avoid money
The waste in source, economic serviceability are strong.Generally speaking, the present invention is that the very promising more level optical signals of low cost of one kind connect
Debit's case.
(2) in the present invention, N number of light intensity modulation module is adjustable transmitting optical power and the luminous intensity tune for modulating extinction ratio
Molding block, and the Output optical power of each light intensity modulation module is completely the same, but different (the N number of light intensity modulations of extinction ratio
The extinction ratio of module is successively successively decreased).By reasonably adjusting the extinction ratio of every road NRZ optical signal, the mostly electric of receiving end can be made
The level presentation of level electrical signal output is uniformly distributed.
Detailed description of the invention
Fig. 1 is the knot for the optical fiber telecommunications system that multichannel NRZ optical signal turns the more level optical signals of single channel in the embodiment of the present invention
Structure block diagram；
Fig. 2 is the stream for the optical fibre communication method that multichannel NRZ optical signal turns the more level optical signals of single channel in the embodiment of the present invention
Cheng Tu；
Fig. 3 is a kind of specific example signal for the optical fiber telecommunications system that multichannel NRZ optical signal turns the more level optical signals of single channel
Figure.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is described in further detail.
Shown in Figure 1, the embodiment of the present invention provides the optical fiber that a kind of multichannel NRZ optical signal turns the more level optical signals of single channel
Communication system, (N is the nature greater than 1 to the light intensity modulation module including N number of adjustable transmitting optical power and modulation extinction ratio
Number), multipath light signal coupled apparatus, the decoupling device of multipath light signal, 1:N single mode photo-coupler and linear response photoelectricity visit
Survey device.
Wherein, N number of light intensity modulation module, for being the NRZ digital telecommunication of R (R is positive integer) by the independent rate in the road N
It number is modulated on the entirely different NRZ optical signal of the road N wavelength, and by N number of optical delay line is input to the road N NRZ optical signal more
In the optical signal coupling device part of road.The above-mentioned independent rate in the road N be R NRZ digital electric signal is fully synchronized in the time domain but data
It is completely uncorrelated, as shown in fig. 1, R1To RNIt is electric as the NRZ number of R to represent the synchronous but incoherent rate of data in the time domain of the road N
Signal.The above-mentioned road N NRZ wavelength of optical signal is different, but its NRZ data carried is fully synchronized in the time domain, at the same N number of wavelength it
Between minimum frequency space also much larger than receiving end photodetector reception electricity bandwidth, as shown in fig. 1, λ1To λNRepresent the road N
The NRZ optical signal that rate synchronous but that data are uncorrelated and wavelength is different is R in time domain.Above-mentioned N number of optical delay line guarantees all N
Road NRZ optical signal still can be fully synchronized when being input to receiving end photodetector by system, as shown in fig. 1,
D1To DNRepresent N number of optical delay line.
Further, in the present embodiment, the Output optical power of each light intensity modulation module is completely the same, but extinction ratio is not
Together.Specifically, the extinction ratio of N number of light intensity modulation module is successively successively decreased.As shown in Figure 1, optical signal λ1Extinction ratio it is maximum；
Optical signal λ2Extinction ratio ratio λ1It is small；Optical signal λ3Extinction ratio ratio λ2It is small, and so on, optical signal λNExtinction ratio ratio
λN-1It is small, and be the smallest in all optical signals.It, can by reasonably adjusting the extinction ratio of every road optical signal in practical operation
So that the level presentation that more level electrical signals of receiving end export is uniformly distributed.
Multipath light signal coupled apparatus is transmitted for making the road N NRZ optical signal while entering in the same optical fiber link.?
In optical fiber link transmission process, it should ensure that the loss of the road N NRZ optical signal and delay are completely the same.Multipath light signal decoupler
Part, for the NRZ optical signal in optical fiber link to be divided into the independent road N NRZ optical signal.1:N single mode photo-coupler is used for N
Road NRZ optical signal is input to photodetector (tail optical fiber is general single mode fiber).The photodetector, for exporting more than one
The electric signal of level modulation, this carry all modulation intelligences of the road N NRZ optical signal, modulation level number is 2N。
Further, in practical application, the light intensity modulation module can be electro-optic modulator, the electro-optic modulator
It can be any optical device that electric signal can be modulated in light intensity, such as: DML (Directly modulated laser, directly
Adjusting laser), electric absorption optical modulator, MZM (Mach-Zehnder Modulator, Mach-Zehnder modulator) etc..The light
Electric explorer can be any optical detector that optical signal can be converted to electric signal, such as balance optical detector, single-ended light
Detector or other optical-electronic demodulators.The optical fiber link can be general single mode fiber link, single mode multi-core optical fiber link or
Person's less fundamental mode optical fibre link etc..On this basis, as long as the light that the multipath light signal coupling/uncoupling clutch part is used according to system
Fine Linktype selection: in general single mode fiber link, multipath light signal coupled apparatus can choose photo-coupler or light
Wavelength division multiplexer, and receiving end signal (the NRZ optical signal i.e. in optical fiber link) can directly input photodetector without
To pass through the decoupling device of multipath light signal and 1:N single mode photo-coupler；In single mode multi-core optical fiber link, multipath light signal coupling
It closes/single mode multicore fan-in can be used in decoupling device/and is fanned out to device；In less fundamental mode optical fibre link, then selection mode coupling and solution are answered
Coupled apparatus (such as photon lantern) is used as multipath light signal coupling/uncoupling clutch part.It is understood that the application actually invented
Range and practical plan are not limited to above-mentioned device.
Shown in Figure 2, the embodiment of the present invention also provides a kind of optical fibre communication method based on above system, including following
Step:
A, the NRZ digital electric signal (R as shown in figure 1 for being R by the independent rate in the road N1To RN) it is separately input into N number of luminous intensity
In modulation module, the road N NRZ digital electric signal is modulated to the entirely different NRZ of the road N wavelength respectively by N number of light intensity modulation module
(λ as shown in figure 1 on optical signal1To λN)；And pass through N number of optical delay line (D as shown in figure 11To DN) road N NRZ optical signal is input to it is more
In the optical signal coupling device part of road；Multipath light signal coupled apparatus makes the road N NRZ optical signal while entering in the same optical fiber link to pass
It is defeated；
B, the NRZ optical signal in optical fiber link is again split into the independent road N after the decoupling device of multipath light signal
NRZ optical signal；The road the N NRZ optical signal is still fully synchronized after 1:N single mode photo-coupler, is finally-transmitted to photodetection
Device；The photodetector will export the electric signal of a Multilevel modulation, and this carry all modulation of the road N NRZ optical signal letters
Breath, modulation level number are 2N。
For a clearer understanding of the present invention, making below by specific example to above-mentioned optical fibre communication method further detailed
Explanation.
As shown in figure 3, the light intensity modulation module of transmitting terminal is disappeared using adjustable transmitting optical power and modulation in the example
The DML modulation module of light ratio；The photodetector of receiving end receives optical signal using photodiode；The optical fiber link of transmission
For two core fibre link of single mode (one kind for belonging to single mode multi-core optical fiber link)；Multipath light signal coupling/uncoupling clutch part uses
Two core single mode optical fiber fan-ins/be fanned out to device.Assuming that having the independent rate in 2 tunnels in the example is the NRZ digital telecommunication of 5Gbit/s
2 DML modulation modules are inputted number respectively.Then the present invention realizes that multichannel NRZ light intensity modulated signal is converted into the more level light of single channel
The detailed step of the optical fibre communication method of intensity-modulated signal is as follows:
S1, the NRZ digital electric signal that the independent rate in 2 tunnels is 5Gbit/s is separately input into 2 DML modulation modules,
2 road NRZ digital electric signals are modulated to (such as Fig. 3 on the entirely different NRZ optical signal of 2 road wavelength respectively by 2 DML modulation modules
Middle λ1、λ2)；This 2 road NRZ wavelength of optical signal is different, but its NRZ data carried is fully synchronized in the time domain, between 2 wavelength
Frequency interval be 100GHz；The Output optical power of 2 DML modulation modules is completely the same, but extinction ratio is different: optical signal λ1's
Extinction ratio optical signal λ2Extinction ratio it is big, reasonably adjust the extinction ratio of every road optical signal, can make receiving end more level electricity
The level presentation of signal output is uniformly distributed；
Then, pass through 2 optical delay lines (D in such as Fig. 31、D2) 2 road NRZ optical signals are input to two core fibre fan-in of single mode
In device, which guarantees that two ways of optical signals is still completely same when by system transmission input receiving end photodetector
Step；Two core fibre fan-in device of single mode makes this 2 road NRZ optical signal while entering two fibre cores of two core fibre of single mode to be passed
It is defeated；Guarantee that loss and the delay of two ways of optical signals are completely the same in transmission process.
NRZ optical signal in S2, optical fiber link is again split into independent 2 road NRZ light after two core of single mode is fanned out to device
Signal；This 2 road NRZ optical signal is still fully synchronized after 1:2 single mode photo-coupler, is finally-transmitted to a linear response
Photodiode (tail optical fiber is general single mode fiber)；The three dB bandwidth of the photodiode is 5GHz, at 50GHz frequency
Without response, which will export one 4 (i.e. 22) level modulation electric signal, carry 2 road NRZ optical signal of transmitting terminal
All modulation intelligences.
Those skilled in the art can carry out various modifications to the embodiment of the present invention and modification, if these modifications and change
For type category within the scope of the claims in the present invention and its equivalent technologies, then these modifications and variations are also in protection model of the invention
Within enclosing.
The prior art that the content being not described in detail in specification is known to the skilled person.
Claims (8)
1. the optical fiber telecommunications system that a kind of multichannel NRZ optical signal turns the more level optical signals of single channel, it is characterised in that: the system includes
Light intensity modulation module, the multipath light signal coupled apparatus, multipath light signal of N number of adjustable transmitting optical power and modulation extinction ratio
The photodetector of decoupling device, 1:N single mode photo-coupler and linear response, N are the natural number greater than 1；
N number of light intensity modulation module is different for the NRZ digital electric signal that the independent rate in the road N is R to be modulated to the road N wavelength
NRZ optical signal on, and the road N NRZ optical signal is input in multipath light signal coupled apparatus by N number of optical delay line, R is positive
Integer；
Multipath light signal coupled apparatus is transmitted for making the road N NRZ optical signal while entering in the same optical fiber link；
The decoupling device of multipath light signal, for the NRZ optical signal in optical fiber link to be divided into the independent road N NRZ optical signal；
1:N single mode photo-coupler, for the road N NRZ optical signal to be input to photodetector；
Photodetector carries all modulation letter of the road N NRZ optical signal for exporting the electric signal of a Multilevel modulation
Breath, modulation level number are 2N；
Synchronous but data are uncorrelated in the time domain for the NRZ digital electric signal that the independent rate in the road N is R；The road N wavelength is not
NRZ data entrained by same NRZ optical signal synchronize in the time domain, and the minimum frequency space between N number of wavelength is greater than photoelectricity
The reception electricity bandwidth of detector；
The Output optical power of N number of light intensity modulation module is consistent；The extinction ratio of N number of light intensity modulation module is successively successively decreased.
2. multichannel NRZ optical signal as described in claim 1 turns the optical fiber telecommunications system of the more level optical signals of single channel, feature exists
In: the light intensity modulation module selects directly modulated lasers DML, electric absorption optical modulator or Mach-Zehnder modulator MZM.
3. multichannel NRZ optical signal as described in claim 1 turns the optical fiber telecommunications system of the more level optical signals of single channel, feature exists
In: the photodetector selects balance optical detector, single-ended optical detector or optical-electronic demodulator.
4. multichannel NRZ optical signal as described in claim 1 turns the optical fiber telecommunications system of the more level optical signals of single channel, feature exists
In: the optical fiber link is general single mode fiber link, single mode multi-core optical fiber link or less fundamental mode optical fibre link；
On this basis, the optical fiber that the multipath light signal coupled apparatus, the decoupling device of multipath light signal are used according to system
Link is selected.
5. multichannel NRZ optical signal as claimed in claim 4 turns the optical fiber telecommunications system of the more level optical signals of single channel, feature exists
In: when the optical fiber link used is general single mode fiber link, the multipath light signal coupled apparatus select photo-coupler or
Light wavelength division multiplexing, and receiving end signal directly input photodetector without by the decoupling device of multipath light signal and
1:N single mode photo-coupler.
6. multichannel NRZ optical signal as claimed in claim 4 turns the optical fiber telecommunications system of the more level optical signals of single channel, feature exists
In: when the optical fiber link used is single mode multi-core optical fiber link, the multipath light signal coupled apparatus selects single mode multicore fan
Enter device, the decoupling device of multipath light signal selects single mode multicore to be fanned out to device.
7. multichannel NRZ optical signal as claimed in claim 4 turns the optical fiber telecommunications system of the more level optical signals of single channel, feature exists
In: when the optical fiber link used is less fundamental mode optical fibre link, the multipath light signal coupled apparatus selects Mode Coupling device, institute
It states the decoupling device of multipath light signal and selects the decoupling device of mode.
8. a kind of multichannel NRZ optical signal based on system described in any one of claims 1 to 7 turns the more level optical signals of single channel
Optical fibre communication method, which is characterized in that method includes the following steps:
A, the NRZ digital electric signal that the independent rate in the road N is R is separately input into N number of light intensity modulation module, N number of light intensity
The road N NRZ digital electric signal is modulated on the entirely different NRZ optical signal of the road N wavelength by degree modulation module respectively；And by N number of
The road N NRZ optical signal is input in multipath light signal coupled apparatus by optical delay line；Multipath light signal coupled apparatus makes the road N NRZ light
Signal enters in the same optical fiber link simultaneously to be transmitted；
B, the NRZ optical signal in optical fiber link is again split into the independent road N NRZ light after the decoupling device of multipath light signal
Signal；The road the N NRZ optical signal is input to photodetector after 1:N single mode photo-coupler；Photodetector exports more than one
The electric signal of level modulation, carries all modulation intelligences of the road N NRZ optical signal, and modulation level number is 2N。
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| CN111835422A (en) * | 2020-07-02 | 2020-10-27 | 武汉市艾玻睿光电科技有限公司 | Multi-core optical fiber communication system based on direct detection of carrier-assisted single detector |
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| CN113359252B (en) * | 2021-06-30 | 2022-03-18 | 长飞光纤光缆股份有限公司 | Multi-channel optical module with single fan-in fan-out based on MPO interface |
| CN116488487B (en) * | 2023-04-06 | 2023-11-17 | 广东工业大学 | A modulation method for AC multi-level photonic power converter topology |
| WO2025018217A1 (en) * | 2023-07-19 | 2025-01-23 | 富士フイルム株式会社 | Communication system |
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| CN101406018A (en) * | 2007-05-24 | 2009-04-08 | 华为技术有限公司 | M-system phase shift keying modulation method and system |
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| CN107919915A (en) | 2018-04-17 |
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