CN103178923A - Multichannel and multispeed wavelength convertor - Google Patents
Multichannel and multispeed wavelength convertor Download PDFInfo
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Abstract
A multichannel and multispeed wavelength convertor comprises 18 two-channel and multispeed wavelength conversion cards, a set of 18-channel multiplexer cards/demultiplexer cards, two control monitor cards, a special use case, a redundant power source and a PC (personal computer) end monitoring software. The multichannel and multispeed wavelength convertor supports an 18 two-channel and multispeed wavelength conversion application (155Mbps/622Mpbs/1.25Gbps/2.5Gbps). The multichannel and multispeed wavelength convertor is simple in structure and stable in performance. A core business board is a two-channel and multispeed wavelength conversion card. The multichannel and multispeed wavelength convertor is characterized in that a two-channel 2*2 asynchronous matrix switch is designed, an STC12C5A60S2 single-chip main control circuit is adopted, an alternating-current coupling resistance match circuit is adopted, and a communication circuit including IIC and 485 bus circuits and communication control software design are provided. The multichannel and multispeed wavelength convertor integrates digital/analog assessing, multiplexing, transmitting and light converting functions, and adopts modularized smart bus design, so that existing optical resource can be fully utilized and future business development can be guaranteed. Meanwhile, the wave-division multiplexing technology can be shared at low cost and optical paving expenses in metropolitan area networks can be reduced, and the multichannel and multispeed wavelength convertor are significant to all fields.
Description
Technical field
The present technique invention is main towards the private network business to mechanisms such as government, finance, the energy, education, army, enterprises and institutions, many speed of multichannel wavelength shifter line side can provide many speed 155Mbps/622Mbps/1.25Gbps/2.5Gbps data feedback channel of 18 different wavelength channels (1271nm---1611nm), user's side can provide the various access waies such as PDH, Ethernet, DWDM, CWDM, FIBER CHANNEL, satisfies flexibly the needs of all kinds of big customers of operator, medium and small commercial accounts multi service access.
Background technology
In recent years, due to the develop rapidly of Network, the problem that during metropolitan area network and short-distance and medium-distance transmission network are built, the ubiquity fiber resource is nervous and the transport service kind is many.Due to the enormous bandwidth of dense wave division multipurpose (DWDM) technology and the transparency of the transmission of data, the hope of people's nature can be DWDM as the transmission platform in metropolitan area network.In long-distance transmission, because DWDM has adopted EDFA (erbium-doped fiber amplifier), light signal is directly amplified, save a large amount of electric trunkings, thereby greatly saved cost.But and restriction itself some gain characteristic narrower due to the EDFA flattened gain bandwidth, people have to adopt laser and dense wave division multiplexer and the demodulation multiplexer of high wavelength stability, and carry out light power equalization on whole circuit; In addition, due to electric relay transmission lengthening distance, very high requirement has been proposed also for dispersion tolerance and the chirping characteristics of laser.The application of these technology has improved again system cost.And at metropolitan area network short due to transmission range (in general 100km), do not need to use amplifier, increase an optical fiber cost also not high, CWDM (Coarse WDM, coarse wavelength division multiplexer) characteristics such as the low cost of technology, large capacity, applying flexible and easy expansion are for broadband metropolitan area network provides brand-new solution.
The effect of wavelength conversion is to change from WDM terminal or the next light signal of other equipment, the light signal on non-matching wavelength to be forwarded on satisfactory wavelength, thereby realize 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 on different links, thus the flexibility that greatly improves network, and the Wavelength conflict of elimination optical channel also helps the Operations, Administration and Maintenance of network simultaneously.
Summary of the invention
Many speed of multichannel wavelength shifter mainly is comprised of 18 many speed of binary channels wavelength transition cards, cover 18 channel multiplexing device/demodulation multiplexer cards, two watch-dog cards, special-purpose cabinet, redundant power and PC end monitoring softwares.Many speed of multichannel wavelength shifter is supported the wavelength transformation applications (155Mbps/622Mbps/1.25Gbps/2.5Gbps) of 18 many speed of passage of single fiber.
Designed many speed of the multichannel wavelength shifter of this paper is simple in structure, stable performance.The access of this system integration digital-to-analog, multiplexing, transmission, light translation function adopt the modularization intelligent bus design, can take full advantage of the existing fiber resource, guarantee the development of following business.Simultaneously, this design is enjoyed wavelength-division multiplex technique with lower cost, reduces the expense of laying optical fiber in establishing of MAN, and is significant concerning the mechanisms such as government, finance, the energy, education, army, enterprises and institutions.This paper mainly illustrates many speed of multichannel wavelength shifter core technology " many speed of binary channels wavelength transition card ".
One, the design of many speed of binary channels wavelength transition card
Many speed of binary channels wavelength transition card divides A, two passages of B, and each passage includes user's side and two, line side optical module, and user's sidelight module wavelength is supported 850/1310/1550nm, and line side optical module wavelength is supported
1271/1291/1311/1331/1351/1371/1391/1411/1431/1451/1471/1491/1511/1531/1551/1571/1591/1611nm。The optical module bandwidth of supporting is 155Mbps/622Mbps/1.25Gbps/2.5Gbps, can satisfy the multiplexing requirement of miscellaneous service.Many speed of binary channels wavelength transition card has the RS485 communication interface, can the real-time working parameter of self all optical module be sent to watch-dog by this interface; And the mode of operation of wavelength transition card can be set to loop back mode or normal mode of operation by watch-dog by the real work situation, and the reflector of line side optical module also can be controlled by watch-dog and open/turn-off in addition.
Many speed of binary channels wavelength transition card hardware components comprises the two-way 2 asynchronous matrix switches of x 2, SFP(Small Form-factor Pluggables) fiber optical transceiver, main controller, resistors match network, telecommunication circuit and LED display circuit etc.The logic of many speed of binary channels wavelength transition card as shown in figure 10.
Two, the hardware designs of many speed of binary channels wavelength transition card
2.1 the two-way 2 asynchronous matrix switches of x 2
SY55859L is a two-way 2 asynchronous matrix switches of x 2, is applicable to SDH/SONET DWDM and other needs the high-speed data switched system of serial data stream loopback and protection channel switch.Broadband, fully differential signal path make accumulated jitter, crosstalk and the signal skew minimum.Every road 2 x 2 matrix switches can fan-out and/or multiplexing data and 2.7GHz clock signal up to 2.7Gbps.All input and output and CML (CML) compatibility is easy to be connected with AC coupled LVPECL signal.When not using, each CML output stage can be turn-offed by enabling to control pin, to save power.When all outputs were in enabled state, typical power consumption was 460 milliwatts.
2.2 SFP fiber optical transceiver
The fiber optical transceiver that this many speed of binary channels wavelength transition card uses is the SFP encapsulation, and the SFP fiber optical transceiver is compared with 9 pin optical transceivers, has advantages of the hot plug of support, has real-time diagnosis information.The SFP fiber optical transceiver of most is all supported SFF-8472 (industrial standard multilateral agreement), according to the SFF-8472 agreement, must support digital diagnostic monitoring (DDM, Digital Diagnostic Monitor) function, this feature makes the end user can detect in real time the SFP parameter, for example 5 basic large monitoring parameters: temperature (Temperature), transceiver supply power voltage (Vcc), laser bias current (Tx Bias Current), optical output power (Tx Power), input power (Rx Power).The information of optical transceiver SFP is stored in the EEPROM of SFP inside, and this information can read by the I2C bus interface between single-chip microcomputer and SFP.Can find potential problem before ageing equipment, inefficacy, all bring facility for product upgrading and maintenance in the future.
2.3 main controller
The governor circuit of many speed of binary channels wavelength transition card is made of the STC12C5A60S2 single-chip microcomputer, and the STC12C5A60S2 single-chip microcomputer is high speed/low-power consumption/superpower jamproof 8051 single-chip microcomputers of new generation, the fully compatible tradition 8051 of instruction code, but the fast 8-12 of speed is doubly.STC12C5A60S2 changes the working method of SY55859L by four pins of SELA0, SELA1, SELB0, SELB1 of controlling SY55859L, realize that many speed of binary channels wavelength transition card is operated in normal mode or LOOPBACK pattern.In addition, because fiber optical transceiver used is SFP encapsulation, can read its real-time running parameter by iic bus, such as the parameter index of the whole communication stabilities of impact such as the emission of fiber optical transceiver working temperature, light signal and received power.Therefore many speed of binary channels wavelength transition card must carry out Real Time Monitoring to the working condition of these optical transceivers owing to having 4 SFP fiber optical transceivers.
2.4 resistors match circuit
Because the interface standard of SFP fiber optical transceiver is the PECL level, and the interface standard of SY55859L is the CML level, so need the interconnection circuit of design high speed logic level.Interconnected the same with TTL, CMOS level, high-speed level is interconnected, and what at first need to consider is whether size and the amplitude of oscillation of level be compatible, if the incompatible conversion that needs realize by resistor network level.
Interconnected between logic level has two kinds of ways.A kind of is direct-current coupling (DC Couple), and namely transmitting terminal and receiving terminal directly connect, and are suitable for the little occasion of common-mode noise.A kind of is AC coupled (AC Couple), be to pass through electric capacity between transmitting terminal and receiving terminal (in the king-sized situation of common-mode noise, should use transformer) isolation, only transmit AC signal, AC coupled has following advantage: one has solved the problem of the ground level potential difference that may exist between transmitting terminal and receiving terminal; Its two, the common-mode noise on the isolation signals circuit; Its three, solved the different problem of DC biased level that may exist between transmitting terminal and receiving terminal.
Because the syntype bias level of LVPECL and CML is different, DC coupling circuit is complicated, is unsuitable for high-speed applications, so LVPECL generally adopts AC coupled to connection and the CML of CML to the connection of LVPECL.
2.4.1 the AC coupled of LVPECL-CML should satisfy following requirement:
(1) common mode electrical level of LVPECL output is Vcc-1.3V, and output output DC stream 14mA.Therefore during AC coupled, DC channel is blocked, and need utilize R1 and R1 to guarantee stable common mode electrical level and the DC loop of 14mA electric current is provided.The AC coupled of LVPECL-CML as shown in figure 11.
(2) coupling of the level amplitude of oscillation.VOD is larger for the LVPECL output voltage swing, is protection CML input port, answers crosstalk resistance R2 with the decay differential pair signal.For example, the output voltage swing VOD of LVPECL is 800mV, and the minimum requirements of the CML input amplitude of oscillation is 400mV, generally speaking, should with the output voltage swing decay 1/3rd of LVPECL, should satisfy formula (2) [in formula (2), 50 Ω refer to single-ended resistance value to GND]:
When R1 gets 150 Ω, can get R2=25 Ω.R2 ' is consistent with the computational methods of R2, repeats no more.
2.4.2 the AC coupled of CML-LVPECL should satisfy following requirement:
(1) at the LVPECL receiving terminal, by the potential-divider network that R1, R2 and R1 ', R2 ' form, it acts on except providing
Beyond the bias level of-2V, can also provide the terminating resistor of 50 Ω.Therefore, R1 and R2 should satisfy following two formula:
When
During=3.3V, R1=130 Ω, R2=82 Ω.
The AC coupled of CML-LVPECL as shown in figure 12.
(2) coupling of the level amplitude of oscillation.When the output voltage swing VOD of CML device is larger, be protection LVPECL input, can be on the differential pair signal line series resistance, with the decay differential pair signal.
2.5 telecommunication circuit
On the veneer of many speed of binary channels wavelength transition card, its telecommunication circuit mainly comprises communication and two parts of communication between plates in plate, and in plate, communication refers to that single-chip microcomputer and 4 interior EEPROM of SFP fiber optical transceiver communicate by iic bus.Communication between plates refers in same cabinet, and many speed of binary channels wavelength transition card and watch-dog communicate by 485 buses.
2.5.1 iic bus circuit
Design is the P1.0 mouth that the clock line of 4 EEPROM all is connected on single-chip microcomputer, and the data wire of 4 EEPROM is connected on respectively the P1.1 of single-chip microcomputer ~ P1.4 mouth, adopts 5 IO causes for gossip now to share same clock, the design of 4 independent iic bus of simulation.Be designed with like this three reasons, the one, because the address of devices of the EEPROM in 4 SFP fiber optical transceivers is identical and can't revise, can't be articulated on the same iic bus; The 2nd, because STC12C5A60S2 does not have the iic bus controller; The 3rd, can reduce to greatest extent the complexity of system.
After many speed of binary channels wavelength transition card powers on, single-chip microcomputer will read 4 information in SFP optical transceiver EEPROM by the I2C bus cycle, wait for that watch-dog carries out poll to it.After receiving the poll instruction that watch-dog sends, it is sent it back watch-dog.
2.5.2 485 bus circuits
Because the communication of many speed of binary channels wavelength transition card and watch-dog is to transmit between plate, and a watch-dog will monitor maximum 4 many speed of binary channels wavelength transition cards simultaneously, so transmission means adopts 485 buses.485 bus interface adopt the combination of balance driver and differential receiver, and anti-common mode disturbances ability strengthens, and noise immunity is good.Because the RS-485 interface has good noise immunity, the above-mentioned advantages such as long transmission range and multistation ability just make it become first-selected serial line interface.But two half-duplex network that transmission line can only form of a RS485 interface, in order to realize the full-duplex communication of watch-dog and many speed of binary channels wavelength transition card, we use two MAX485 chips, and a slice only is used for sending, and another sheet only is used for receiving.
Three, the Software for Design of many speed of binary channels wavelength transition card
Use the C language to write the software of many speed of binary channels wavelength transition card on Keil 4 development environments, adopted modular design philosophy, the function of its realization comprises: the system configuration initialization, control SY55859L mode of operation, read the real-time working parameter of 4 SFP fiber optical transceivers and communicate by 485 bus interface and watch-dog by the I2C bus.
3.1 system configuration initialization
When many speed of binary channels wavelength transition card powers on, single-chip microcomputer will first complete self serial ports configuration, configuration parameter is baud rate 9600,8 bit data positions, 1 position of rest, no parity check position.Then read the operating state code of many speed of binary channels wavelength transition card when cutting off the power supply last time from the 0x00 address of EEPROM, changed the level state of single-chip microcomputer P2.0 ~ P2.3 by state code, the identical when mode of operation of SY55859L was cut off the power supply with last time.
3.2 the SY55859L mode of operation is controlled
The SY55859L chip uses simple, need not peripheral operating circuit, only needs SELA0, SELA1, SELB0, four pins of SELB1 are connected with the P2.0 ~ P2.3 of single-chip microcomputer and get final product.As long as the level state that changes single-chip microcomputer P2.0 ~ P2.3 just can be realized carrying out work by arbitrary passage of many speed of binary channels wavelength transition card under normal mode or LOOPBACK pattern.
3.3 IO mouth Simulation with I 2C sequential
The I2C bus is the bus protocol that is connected between a kind of integrated circuit (IC) device of proposing of Philips company, its objective is that the line that makes between each IC device of electronic system becomes easy.EEPROM in the SFP fiber optical transceiver is the memory of the 2Kbit(256 a kind of commonly used that adopts the I2C interface * 8bit).51 series monolithics itself do not have the I2C interface, realize the I2C bus communication so we just simulate with reference to the I2C agreement by the IO mouth of single-chip microcomputer with software.The information that reads comprises the data of memory address 20-35,40-45,60-61 in address of devices A0, and the data of memory address 96-97,102-103 in address of devices A2.
Four, the systemic-function of watch-dog card
4.1, authentication
4.2, machine frame draw-in groove operating state shows
4.3, the power work state shows
4.4, control and the demonstration of fan work state
4.5, single-board operation state shows
4.6, the operating state setting of webmaster card itself, as: log in the setting of account and password and modification, the machine IP arranges.
Description of drawings
Fig. 1 is the design structure diagram of many speed of multichannel wavelength shifter
Fig. 2 is the design structure diagram of many speed of binary channels wavelength transition card
Fig. 3 is the design structure diagram of watch-dog card
Fig. 4 is many speed of multichannel wavelength shifter case radiation fan figure
Fig. 5 is many speed of multichannel wavelength shifter cabinet card guide rail figure
Fig. 6 is many speed of multichannel wavelength shifter chassis power supply panel figure
Fig. 7 is many speed of multichannel wavelength shifter monitor card panel figure
Fig. 8 is 18 wavelength division multiplexing card faceplate figure
Fig. 9 is wavelength transition card panel figure
Figure 10 is the logic diagram of many speed of binary channels wavelength transition card
Figure 11 is the LVPECL-CML AC coupled
Figure 12 is CML-LVPECL AC coupled.
Claims (3)
1. many speed of multichannel wavelength shifter, is characterized in that: (1) CWDM Coarse Wavelength Division Multiplexing card (2) many speed of binary channels wavelength transition card (3) watch-dog card (4) radiator fan (5) redundant power module (6) cabinet.
2. many speed of multichannel wavelength shifter according to claim 1, it is characterized in that: at first the optical transmission signal of reception marks off 18 different wavelength channels (1271nm---1611nm) via CWDM Coarse Wavelength Division Multiplexing service subcard, access to many speed of binary channels wavelength transformation service subcard and connect again various users by wavelength shifter and use 850/1310/1550nm, can support 155Mbps/622Mbps/1.25Gbps/2.5Gbps.
3. many speed of binary channels wavelength transition card according to claim 1, is characterized in that: the two-way 2 asynchronous matrix switch designs of x 2, the governor circuit that adopts the STC12C5A60S2 single-chip microcomputer, the resistors match circuit that adopts AC coupled, the telecommunication circuit that comprises IIC and 485 bus circuits, communications control software design.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135269A (en) * | 2014-07-16 | 2014-11-05 | 北京无线电测量研究所 | High-speed clock signal transmission system and method |
| CN105610512A (en) * | 2016-03-21 | 2016-05-25 | 成都新易盛通信技术股份有限公司 | DC-20Mbps low-rate double-reception SFP optical module |
| CN106301584A (en) * | 2015-05-22 | 2017-01-04 | 青岛海信宽带多媒体技术有限公司 | Optical module and differential electric signal output circuit |
| CN111919402A (en) * | 2019-01-03 | 2020-11-10 | 华为技术有限公司 | Optical communication device, optical line terminal and optical communication processing method |
| CN112383355A (en) * | 2020-11-11 | 2021-02-19 | 许继集团有限公司 | Novel RS485 changes optical fiber communication module |
| CN114050865A (en) * | 2021-10-13 | 2022-02-15 | 武汉光迅科技股份有限公司 | Data transmission device, chip and electronic equipment |
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| 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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- 2013-01-18 CN CN2013100189682A patent/CN103178923A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135269A (en) * | 2014-07-16 | 2014-11-05 | 北京无线电测量研究所 | High-speed clock signal transmission system and method |
| CN106301584A (en) * | 2015-05-22 | 2017-01-04 | 青岛海信宽带多媒体技术有限公司 | Optical module and differential electric signal output circuit |
| CN106301584B (en) * | 2015-05-22 | 2018-10-23 | 青岛海信宽带多媒体技术有限公司 | Optical module and differential electric signal output circuit |
| CN105610512A (en) * | 2016-03-21 | 2016-05-25 | 成都新易盛通信技术股份有限公司 | DC-20Mbps low-rate double-reception SFP optical module |
| CN111919402A (en) * | 2019-01-03 | 2020-11-10 | 华为技术有限公司 | Optical communication device, optical line terminal and optical communication processing method |
| CN111919402B (en) * | 2019-01-03 | 2022-01-11 | 华为技术有限公司 | Optical communication device, optical line terminal and optical communication processing method |
| US11515943B2 (en) | 2019-01-03 | 2022-11-29 | Huawei Technologies Co., Ltd. | Optical communications apparatus, optical line termination, and optical communication processing method |
| CN112383355A (en) * | 2020-11-11 | 2021-02-19 | 许继集团有限公司 | Novel RS485 changes optical fiber communication module |
| CN112383355B (en) * | 2020-11-11 | 2022-06-14 | 许继集团有限公司 | RS485 changes optical fiber communication module |
| CN114050865A (en) * | 2021-10-13 | 2022-02-15 | 武汉光迅科技股份有限公司 | Data transmission device, chip and electronic equipment |
| CN114050865B (en) * | 2021-10-13 | 2023-04-07 | 武汉光迅科技股份有限公司 | Data transmission device, chip and electronic equipment |
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