CN103200398A - Multi-channel light convergence video transmitter - Google Patents
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- CN103200398A CN103200398A CN2013101583243A CN201310158324A CN103200398A CN 103200398 A CN103200398 A CN 103200398A CN 2013101583243 A CN2013101583243 A CN 2013101583243A CN 201310158324 A CN201310158324 A CN 201310158324A CN 103200398 A CN103200398 A CN 103200398A
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Abstract
The invention discloses a multi-channel light convergence video transmitter, which aims at a mass of video optical path convergence transmission. The multi-channel light convergence video transmitter mainly converges optical signals of multiple user side senders to one or multiple paths of 1.25G optical channels, multiplexes in a TDM (Time Division Multiplex) mode, realizes the single-fiber bidirectional transmission in combination with a 18-path CWDM (Coarse Wavelength Division Multiplexing) technology, and also realizes the transmission of 144 paths of digital non-compressed video signals by one single optical fiber. The multi-channel light convergence video transmitter mainly comprises a 8-channel video light convergence card, a 8-channel video sending card, a 8-channel video receiving card, a dual-channel multi-rate wavelength converter card, a set of 18-channel multiplexer/demultiplexer card, two monitor cards, a special case, a redundant power source and monitoring software. The system design of the 8-channel video light convergence card contains a high-speed serial-parallel conversion light convergence circuit design, a master control circuit of CPLD (Complex Programable Logic Device), a resistance matching circuit with AC coupling, a communication circuit comprising IIC and 485 bus circuits, and a light convergence control software design.
Description
Technical field
In recent years, because the develop rapidly of Network, the problem that the ubiquity fiber resource was nervous and the transport service kind is many during metropolitan area network and short-distance and medium-distance transmission network were built, therefore, how in limited fiber resource simultaneously efficiently the transmission of large capacity video traffic become the development bottleneck of city safety engineering, become the direction that the scientific research personnel makes great efforts simultaneously.Develop a kind of reliable operation,, business interface complicated and diversified multichannel light aggregate video transmitter strong to transmission system adaptability, improve the fiber resource utilance, make a large number of users enjoy the enormous bandwidth resource of backbone network.
Research and develop a kind of multichannel light aggregate video transmitter that converges access function arbitrarily that has based on digital non-compression video.It has multistage full light, digital converging, characteristics such as the fine transmission of large capacity single, the non-compressed image of high-quality full real time digit.This system is particularly suitable for the fiber optic network structure of operator, is the best solution that makes up the high-quality digital video Access Network at the existing fiber network.
Background technology
Wavelength division multiplexing (WDM) technology has become the mainstream technology of optical transfer network, has obtained using widely in optical communication system.Highly dense wavelength division multiplexing (DWDM) technology is widely used in long distance line and backbone network, preferably resolves current bandwidth demand.The bandwidth bottleneck of network has been transferred to metropolitan area network gradually, the focus that turns current networking into of metropolitan area network.The CWDM technology more and more comes into one's own in the construction of metropolitan area network with its special advantages.Except metropolitan area network and Access Network, in light area stores network (SAN), also paid attention to widely.
The effect of wavelength conversion is to change from WDM terminal or the next light signal of other equipment, the light signal on the non-matching wavelength is forwarded on the satisfactory wavelength, thereby realizes the conversion of signal from a wavelength to another wavelength.In containing the network of wavelength conversion, optical channel can be by setting up with different wavelength at different links, thereby improve network more flexible greatly, and the wavelength conflict of elimination optical channel also helps the Operations, Administration and Maintenance of network simultaneously.
In the time of telecom operators' quickening self networking, QoS of customer more and more is much accounted of, and the main line that some are important and high-end big customer adopt the double route backup to become a kind of trend.By the route protection technology can help the user set up one do not have blocking-up, highly reliable, safety flexibly, optical communication net that the anti-disaster ability is strong.
The fiber amplifier technology is exactly to mix the lasing rare earth element of energy in the fibre core of optical fiber, by the direct current light stimulus that laser provides, makes the light signal that passes through obtain amplifying.Traditional fiber optic transmission system is to adopt light-electricity-optical regenerative repeater, this trunking influences stability and the reliability of system, for removing above-mentioned transfer process, directly on light path, signal is amplified transmission, will replace this regenerative repeater with a full light-transmitting type repeater.The equipment that is suitable for has erbium-doped fiber amplifier (EDFA), PDFA Praseodymium Doped Fiber Amplifier (PDFA), mixes niobium fiber amplifier (NDFA).Optical Amplification Technology mainly is to adopt EDFA at present.The initial stage nineties, succeeding in developing of Erbium-Doped Fiber Amplifier (EDFA) broken fiber-optic communications traffic apart from the restriction that is subjected to fibre loss, makes all optical communication distance extend to several thousand kilometers, bring revolutionary variation to optical fiber communication, be described as " milestone " of optical communication development.
Time division multiplexing (TDM) technology is to cut apart by the time of transmission signal, it transmits different signals in the different time, the whole transmission time is divided into (Slot time, TS of many time intervals, be called time slot again), each timeslice is taken by one road signal.TDM realizes that by the part of each road signal of intersection transmission in time a circuit transmits multiple signals.The of short duration moment of on the circuit each has only one road signal to exist.Factor word signal is limited centrifugal pump, so in the TDM technology extensive use optical communication network.
The digital video transmission technology carry out high-resolution digitalization with multi-channel analog base band video, audio frequency, data, forms high-speed figure stream, then multi-path digital stream is carried out multiplexingly, carries out multiplexing and demultiplexing by transmitting terminal and receiving terminal and reverts to digitized signal.The data video transmission technologies has solved problems such as analog video big volume transport cost prohibitive of when transmission, vision signal are subject to disturb, signal transmission quality is difficult to get a promotion fully.
Traditional digital fiber video transmission all is by the point-to-point transmission means of control point to client, if will carry out separately for each node that relatively disperses that long-distance transmissions can be utilized a large amount of fiber resources and also be a kind of waste to the efficiency of transmission of optical fiber itself, if several roads fiber data that originally will carry out long-distance transmissions is all converged and then transmits in the place close to relatively from each point at one, so just can well save fiber resource and make the original multi-core fiber that needs to transmit become present single optical fibre just to solve.Reduce unnecessary circuit, reduced cost.
Summary of the invention
Multichannel light aggregate video transmitter is the solution at a large amount of mixed video light path aggregate transmission.Multichannel light aggregate video transmitter mainly is aggregated to the light signal of many user's side transmitters one or more 1.25G optical channel and realizes the single fiber bi-directional transmission in conjunction with 18 road CWDM wavelength-division multiplex techniques, realizes simple optical fiber carrying transmission 144 way word non-compression videos.
Multichannel light aggregate video transmitter mainly by 8 passage video light converge card, 8 passage video reception cards, 8 passage video transmission cards, many speed of binary channels wavelength shifter card, a cover 18 channel multiplexings device/demodulation multiplexer card, two watch-dog cards, special-purpose cabinet, redundant power and monitoring softwares are formed.
1.1, the design principle of multichannel light aggregate video transmitter
The design principle of multichannel light aggregate video transmitter is that the convergence on the multi-channel optical fibre is transmitted to one road optical fiber, and the optical fiber vision signal that will be transmitted by 8 optical modules of far-end enters string and conversion chip after by opto-electronic conversion respectively and recovers wherein digital signal and clock signal; Then, go up the multipath high-speed digital signal that recovery is come out at CPLD (CPLD) and carry out the 10b/8b conversion, and then the multiple signals that conversion is come are carried out time division multiplexing, and by at a high speed and go here and there conversion chip time-multiplexed parallel digital signal is converted to the CML level signal of serial, deliver to again on the SFP optical module and be coupled into Optical Fiber Transmission by optical transmitting set.Carry out corresponding data again at receiving terminal and handle, recover vision signal wherein.Prove that by experiment this system works is stable, the real-time Transmission effect is relatively good.Its scheme as shown in Figure 1.
Passing the convergence of coming by the single channel video optical multiplexer with far-end makes the information that converges recover wherein each road video information at receiving terminal by the reception of 8 road video optical multiplexer receiving terminals again an optical fiber transmission to the aggregate video optical transceiver then.Transmission method is in the past compared, the resource that the system of building by newly-designed aggregate video optical transceiver can save optical fiber.Can be in intermediate conveyor make by time division multiplexing principle and need be modified at 8 road video datas that 8 optical fiber transmit originally at optical fiber transmission 8 road video data optical fiber.Needing the large tracts of land video monitoring but place that camera relatively disperses, this system not only can save the resource of optical fiber in a large number, and can also economize on the cost at family.
Data sync on each single channel video optical multiplexer of front end that the design's difficult point is to receive is to the aggregate video optical transceiver, and data loses in the time of not so can causing the incorrect and time division multiplexing that reads data owing to the clock problem data of striding time domain transmission asynchronous.Solution is to make front end emission and the pool side clock can be synchronously accurate, and the metastable state of read data and data that frequency difference causes are inaccurate in the time of can avoiding like this striding the time domain transmission, influences the quality that video transmits.On aggregate video optical transceiver on the single channel video optical multiplexer of front end, used a pair of SN65LV1023A and SN65LV1224B to utilize the characteristic of 1224B respectively, because its chip internal has the transmit clock that CDR module (data clock recovery module) can recover the data that read out according to data and the reference clock of reception, this clock that recovers out of recycling is as the clock of AD conversion and the transmit clock of 1023A.And then the 1224B on the aggregate video optical transceiver recovers this clock and utilize this clock to read data.Can well solve the nonsynchronous problem of time domain transfer clock of striding in this system like this.And the unnecessary data storage cell that adds the outside, also need not use the expensive FPGA of price, saved cost.And the video effect transmission is good.
1.2,8 passage video light converge the card hardware designs
System comprises front end LVDS parallel serial conversion module and LVDS parallel serial conversion module, CPLD data processing module, nine kinds of needles optical module, SFP optical module, tlk1501 string and modular converter, 51 microcomputer monitoring modules.System block diagram as shown in Figure 2.
String also/parallel serial conversion module adopted SN65LV1023A and SN65LV1224B, be a frequency range be 10 ~ 66M Hz, 10:1 low-voltage differential signal (LVDS) and the string data conversion chip, what serial data adopted is the low-voltage differential signal transmission.Because the voltage swing of low-voltage differential signal is little, so conversion speed is faster, and can not increase crosstalk, EBI and power consumption, can improve signal to noise ratio greatly.At receiving terminal, LV1224B has phase-locked loop, can recover to send the clock of data automatically, when receiving terminal receive pass the serial data come after, at first lock, the recovery system clock is converted to serial data the output of 10 parallel-by-bit data then.
The reception of front end is the optical module of fiber-optic signal at a distance, has adopted nine kinds of needles symmetrical beam module NM5330B/NM3330B., the 5V power supply, and standard TTL has light to detect, and it is high that the light time is arranged, and unglazed is low, 155M transfer of data, standard P ECL interface.
Because the interface standard of optical module is the PECL level, and the interface standard of 1023A and 1224B is the LVDS level.This just needs a level shifting circuit to make each module receive correct data.Match circuit adopts the mode of AC coupled.This match circuit has satisfied the syntype bias level that 3.7V is provided for the LVPECL input.But also satisfied the PECL signal to the differential signal impedance matching between the LVDS signal.For realizing the impedance matching on the circuit, the equivalent resistance of resistor network should be 50 ohm.The output of PECL need add direct current biasing resistance R (270 Ω ~ 350 Ω) to ground, must be connected in series 50 Ω resistance on the synchronous signal passage, so that certain decay to be provided.The input of LVDS need add 5k Ω resistance to ground, so that syntype bias to be provided.
When the transfer of data that converges is gone out, to adopt at a high speed and go here and there conversion chip.Adopting the TLK1501 chip, is a support string and the two-way chip of going here and there.According to the chip data handbook, when the LOOPEN of tlk1501 pin was high level, the serial data of transmission was directly sent into the input of receiver by inside, and differential lines DOUTTXP and XN are controlled in high-impedance state, when it was low level, serial data could normal output.All the time drag down when therefore here we control this pin with CPLD.PRBSEN is that the control of chip internal pseudo-random binary sequence enables, and when it was high level, the expression pseudo-random binary sequence received correct.TD0 ~ TD15 and RD0 ~ RD15 are respectively transmitting terminal and the receiving terminal of TLK1501 data, and TD0 ~ TD15 sends 16 parallel-by-bit digital signals, and TX-CLK is synchronous with clock, and rising edge is effective.RD0 ~ RD15 receives 16 parallel-by-bit digital signals, and synchronous with the clock GTX-CLK that recovers to come out, rising edge is effective.ENABLE is TLK1501 work enable pin, and when it was low level, chip was in the state of outage, and when it was high level, chip could operate as normal.Because data are continual transmission, so we put height all the time to this pin.TESTEN is test enable control, and this pin needs ground connection.RX-ER is for receiving the error in data pin, and this pin is for high when accepting error in data.RX-DV is effective for receiving data.TX-EN is for sending data enable control, and it is in high level during transmission, and TX-ER is for sending error in data.
Go here and there and change then by the conversion of SFP optical module electric light and enter Optical Fiber Transmission will converging data.What here we adopted is that capacity is the SFP optical module of 1.25G, and the heap(ed) capacity of the optical module of SFP is 1.6G in the practical application.The operation wavelength of this optical module is 1310nm and 1550nm.3.3V power supply power supply, the input and output of standard LVPECL level, the alarm of high level loss of gloss can also be read with the mode of the IIC information to optical module by single-chip microcomputer, as the luminous power that receives, loss of gloss warning information, producer's information, the temperature of optical module.By single-chip microcomputer this SFP optical module is carried out reading of data in order to detect, and the information that detects is transferred to the monitoring integrated circuit board by 485 chips.The SFP optical module also receives the light data that transmit at a distance.Here our usefulness is the chip that a P changes T, and SY100ELT23V can be converted to the LVPECL signal that receives standard TTL signal by this chip, in order to extract control signal.
Converge on the optical transceiver owing to have 9 optical modules at this, wherein the nine kinds of needles optical module of eight symmetries and 1 SFP optical module, if undesired that of one of them optical module work will in time generate warning message, know that optical module does not have operate as normal, maintenance in time.This has very big using value in the middle of practical application.Therefore must have or not light path to monitor in real time to these optical modules.Utilize the loss of gloss warning information of each optical module to grasp these information in real time.51 single-chip microcomputers read these information by general IO mouth and pack and send.And the information of integrated circuit board own is sent.Because the information of sending is the straddle transmission, transmit so when the IO mouth is exported these information, will be transformed to 485 differential signals to the Transistor-Transistor Logic level of this standard, these information transmitted antijamming capabilities are stronger.
1.3,8 passage video light converge card software design
As the core of native system, the CPLD module needs not only to finish that data are handled but also the initialization that need finish each ancillary equipment.Select for use XC95288XL288 as the CPLD module of native system, it has 288 macrocells and has 208 pins well to satisfy the requirement of native system.
On Xilinx ISE 9.1, CPLD is carried out the design of program.The function that CPLD need realize comprises: peripheral each module of initialization, provide clock to each module, 10b/8b conversion, each circuit-switched data of time division multiplexing, receive 1 road TTL data.Programming language is Verilog HDL, has adopted modularization idea.
1023A and 1224B, the initialization of TLK1501 is extremely important, wherein needs to carry out before 1023A and the 1224B proper communication synchronously.And TLK1501 also needed to send synchronous code before proper communication.Only having finished synchrodata could receive normally.1023A and 1224B have two kinds of methods of synchronization, and a kind of is quick synchronization, and a kind of convenient for programming, we select to lock at random synchronization in order to lock synchronization at random, both as long as the SYNC1 of 1023A and the pin of SYNC2 are formulated.And needing to launch synchronous code before the TLK1501 operate as normal, we only need put the higher position again with clock cycle of TX-EN pin bottom set of TLK1501 can just can finish the synchronous of two TLK1501 when launching time-multiplexed valid data.The synchronous state transition diagram of TLK1501 as shown in Figure 3.
Module clocks all in the native system are all provided by CPLD, and the clock of CPLD is provided by the active crystal oscillator of the 75M of periphery, and CPLD introduces this clock by the global clock pin and through an inner BUFFER, and then carries out frequency division.What wherein give 1023A and 1224B is that clock is 12.5M, carries out 6 frequency divisions.Giving the clock of TLK1501 is 75M., directly exports through a buffer memory.In program, at first the 10bit input is read in, according to the principle of code character before coding back each unidirectional corresponding coding of code character in the coding schedule, code character before the output encoder of tabling look-up, finish decoding work, and then these these data time division multiplexinges are sent.Since the time slot that the 75M crystal oscillator has 6 12.5M wherein two time slots be used between the TLK1501 synchronously because the clock cycle of TLK1501 can send the 16bit data, so four remaining time slots are used for time division multiplexing 8 road 8bit data.
Finish the PECL differential signal to the conversion of standard Transistor-Transistor Logic level through SY100ELT23V, read this TTL signal then, because this TTL signal has a frame synchronization head, we read the control information that comprises among this TTL again after reading this frame synchronization head entirely true.
Single-chip microcomputer reads the information of SFP optical module by two IO mouth Simulation with I IC communication protocols in the P2 mouth, reads the loss of gloss warning information of 8 nine kinds of needles optical modules again by the P1 mouth.By the P0 mouth these information package are sent for host computer again this aggregate video optical transceiver is monitored.
Description of drawings
Fig. 1 is improved 8 road video transmission plans
Fig. 2 is system block diagram
Fig. 3 is the state transition diagram of TLK1501
Fig. 4 is that 8 passage video light converge card project organization figure
Fig. 5 is multichannel light aggregate video transmitter cabinet integrated circuit board guide rail figure
Fig. 6 is multichannel light aggregate video transmitter case radiation fan figure
Fig. 7 is wavelength transition card panel figure
Fig. 8 is 18 wavelength division multiplexing card faceplate figure
Fig. 9 is monitor card panel figure.
Claims (3)
1. multichannel light aggregate video transmitter, it is characterized in that: (1) 8 passage video light converges card (2) 8 passage video transmission cards (3) 8 passage video reception card (4) many speed of binary channels wavelength shifter card (5) CWDM Coarse Wavelength Division Multiplexing card (6) watch-dog card (7) radiator fan (8) redundant power module (9) cabinets.
2. multichannel light aggregate video transmitter according to claim 1, it is characterized in that: mainly the light signal with many user's side transmitters is aggregated to one or more 1.25G optical channel, multiplexing and realize the single fiber bi-directional transmission in conjunction with 18 road CWDM wavelength-division multiplex techniques in the TDM mode, realize simple optical fiber carrying transmission 144 way word non-compression videos.
3. 8 passage video light according to claim 1 converge card, it is characterized in that: at a high speed the light of string and conversion converge circuit design, adopt CPLD governor circuit, adopt the resistors match circuit of AC coupled, telecommunication circuit, the light that comprises IIC and 485 bus circuits to converge the design of control software.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104660989A (en) * | 2015-01-28 | 2015-05-27 | 中国科学院光电技术研究所 | Optical fiber-to-full configuration type Camera link real-time image optical transceiver based on FPGA |
| CN107360413A (en) * | 2017-08-25 | 2017-11-17 | 秦山 | A kind of multi-view stereo image method for transmitting signals and system |
| CN107528635A (en) * | 2017-08-17 | 2017-12-29 | 北京广利核系统工程有限公司 | Communicator and method based on SFP optical modules |
| CN108681518A (en) * | 2018-05-21 | 2018-10-19 | 中国科学院国家空间科学中心 | A kind of low speed IO time division multiplex systems |
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| EP2234294A1 (en) * | 2007-12-13 | 2010-09-29 | Huawei Technologies Co., Ltd. | Aggregation node device of passive optical network and the system thereof |
| CN201750425U (en) * | 2009-03-12 | 2011-02-16 | 天津七所信息技术有限公司 | Coarse wavelength division and dense wavelength division optical transmission system |
| CN102420651A (en) * | 2011-08-31 | 2012-04-18 | 天津七所信息技术有限公司 | Comprehensive service optical-transmission platform |
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| EP2234294A1 (en) * | 2007-12-13 | 2010-09-29 | Huawei Technologies Co., Ltd. | Aggregation node device of passive optical network and the system thereof |
| CN201185460Y (en) * | 2008-04-01 | 2009-01-21 | 深圳市诺龙实业有限公司 | Optical concourse optical transmitter-receiver and video optical fiber transmission system |
| CN201750425U (en) * | 2009-03-12 | 2011-02-16 | 天津七所信息技术有限公司 | Coarse wavelength division and dense wavelength division optical transmission system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104660989A (en) * | 2015-01-28 | 2015-05-27 | 中国科学院光电技术研究所 | Optical fiber-to-full configuration type Camera link real-time image optical transceiver based on FPGA |
| CN104660989B (en) * | 2015-01-28 | 2018-02-13 | 中国科学院光电技术研究所 | Optical fiber-to-full configuration type Camera link real-time image optical transceiver based on FPGA |
| CN107528635A (en) * | 2017-08-17 | 2017-12-29 | 北京广利核系统工程有限公司 | Communicator and method based on SFP optical modules |
| CN107528635B (en) * | 2017-08-17 | 2024-03-19 | 北京广利核系统工程有限公司 | Communication device and method based on SFP optical module |
| CN107360413A (en) * | 2017-08-25 | 2017-11-17 | 秦山 | A kind of multi-view stereo image method for transmitting signals and system |
| CN108681518A (en) * | 2018-05-21 | 2018-10-19 | 中国科学院国家空间科学中心 | A kind of low speed IO time division multiplex systems |
| CN108681518B (en) * | 2018-05-21 | 2020-12-11 | 中国科学院国家空间科学中心 | Low-speed IO time division multiplexing system |
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