CN102255669B - C form-factor pluggable (CFP) transponder with interleaver at receiver - Google Patents
C form-factor pluggable (CFP) transponder with interleaver at receiver Download PDFInfo
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Abstract
The invention discloses a C form-factor pluggable (CFP) transponder with an interleaver at a receiver. The CFP transponder comprises a transmitter and the receiver. The receiver has two groups of 1:2 modified multiplexers and the interleaver connected with the 1:2 modified multiplexers by an optical fiber, wherein the 1:2 modified multiplexers and the interleaver are all used for demultiplexing a path of optical signals with different wavelengths into two independent paths of optical signals. The CFP transponder with the interleaver at the receiver is used for 40G or 100G LR4 and ER4 type CFP communication systems, has the advantages of simple structure and low cost, and is easy to package and produce in batches. In the structure, coarse wavelength division multiplexing (CWDM)/local area network-wavelength division multiplexing (LAN-WDM) optical signals with four wavelengths are demultiplexed into four independent paths of optical signals by the interleaver and the 1:2 modified multiplexers (1:2MUX). By the technology provided by the invention, the cost of the receiver can be reduced to 1/5 to 1/10 of that of the prior art.
Description
Technical field
The present invention, about a kind of optical transceiver, refers to a kind of CFP optical transceiver at optical receiving end with light intersection Wave decomposing multiplexer especially.
Background technology
In recent years, increase rapidly (for example cloud computing, the connection of router-to-router, the transmission of image) due to the market demand, Fiber Optical Communication System is being upgraded to the speed of 40G, and 40G optical transceiver (Transponder) is subsystem the most key in 40G optical communication system.
40G optical transceiver need be used more more advanced than 10G optical transceiver, complicated and difficult technology, and its cost is higher.Compare with the optical transceiver of serial 40G, 40G CFP (the pluggable optical transceiver device of CFP:C Form-Factor Pluggable-C type external form, as 40G BASE LR4 CFP) has advantages of lower cost and long transmission distance.Due to the quick increase of communication service demand, 40G system has accounted for significant proportion in utility system, and 100G system also has small-scale development.CFP is the common package dimension product that meets multi-source agreement, for transmitting high speed digital signal, CFP optical transceiver is applied in utility system, the CFP2 of less package dimension and CFP4 optical transceiver are also developed, and the multi-source agreement that still meets CFP2 and CFP4 does not also thoroughly complete.40GCFP/CFP2/CFP4 and 100G CFP/CFP2/CFP4 are the very important optical transceivers of client, in CFP optical transceiver, it is highly important that transmitter and (or) receiver need little size.
Figure 1 shows that the structure of traditional 40GBASE-LR4 CFP optical transceiver.At transmitting terminal, four road CWDM (Coarse Wavelength Division Multiplexer, coarse wavelength division multiplexer) wavelength (is respectively 1271nm, 1291nm, 1311nm, light signal TX3 1331nm), TX2, TX1, TX0 is respectively by CDR (Clock Data Recover, clock and data recovery), LD (Laser Diode, laser diode), DML (Directly Modulated Laser, direct modulated laser) and the CWDMMUX (use in sparse wave-division multiplexer) of a 4:1 complete multiplexing, be multiplexed into a transmitting monomode fiber (SMF TX, Single Mode Fiber TX) in, at receiving terminal, one road optical signals reception monomode fiber (SMF RX, Single Mode Fiber) is 4 CWDM wavelength (1271nm, 1291nm by CWDM DeMUX (the use in sparse wave-division demultiplexing device) demultiplexing of a 1:4,1311nm, 1331nm).At the light inputting end of transmitting terminal and the bright dipping end of receiving terminal, being four-way serial bus interface (XLAUI), is physical medium associated layers interface (PMD service interface) between the CDR of transmitting terminal and LD and between the CDR of receiving terminal and TIA (transimpedance amplifier).Because the size of CFP/CFP2/CFP4 is smaller, therefore make the size of transmitting terminal 4*DML+CWDM MUX and receiving terminal CWDM DEMUX+4* (PIN/TIA) (PIN is p-i-n photodiode, and TIA is transimpedance amplifier) structure as far as possible little just extremely important.In order to reduce the size of receiving terminal, common way is to use integrated CWDM DeMUX+4* (PIN/TIA), or uses the CWDM DeMUX+4 with tail optical fiber the separated PIN/TIA with tail optical fiber of one.For CWDM DeMUX+4* (PIN/TIA), there are two kinds of modes to realize, the one, with integrated AWG (Array Waveguide Grating, array waveguide grating) DeMUX+4* (PIN/TIA), another kind is the free space optical system that use and PIN/TIA are integrated together.For integrated CWDM DeMUX+4* (PIN/TIA), encapsulation difficulty is larger, and supplier is few, and the packaging cost of integrated CWDMDeMUX+4* (PIN/TIA) is high in addition, and rate of finished products is low, is difficult to large-scale production.For small-sized CWDM DeMUX, be also faced with same problem, the high and very difficult large-scale production of cost.
Figure 5 shows that the traditional structure of 100G BASE-LR4 CFP.At transmitting terminal, transmission channel (TXLANE) Shi road light signal becomes four road LAN-WDM (Local Area Network-Wavelength Division Multiplexer by a 10:4 parallel-to-serial converter (10:4Serializer), local area network (LAN)-wavelength division multiplexing) wavelength (1295.56nm, 1300.05nm, 1304.58nm, light signal 1309.14nm), and then successively by MD (modulator driving), EML (Electro-Absorption Modulated Laser, Electroabsorption Modulated Laser) carry out multiplexed with a 4:1 LAN-WDM MUX (local area network (LAN)-wavelength division multiplexer), at receiving terminal, light signal is by after a 1:4LAN-WDM DeMUX (local area network (LAN)-wavelength division multiplex demodulation multiplexer) demultiplexing, become 4 LAN-WDM wavelength (1295.56nm, 1300.05nm, 1304.58nm, 1309.14nm), via PIN, TIA and 4:10 deserializer (4:10De-serializer), by receive path (RXLANE), received, therefore keep that the size of LAN-WDM DEMUX+4* (PIN/TIA) is enough little just seems particularly important.But the transmitting terminal of 100GBASE-LR4CFP and the packaging cost of receiving terminal are high at present, and rate of finished products is low, and cost is high, be difficult to large-scale production.
Summary of the invention
In view of this, main order of the present invention is to provide a kind of easy encapsulation, cost is low and the receiving terminal of applicable batch production has light and intersects the CFP optical transceiver of Wave decomposing multiplexer.
For achieving the above object, the invention provides the CFP optical transceiver that a kind of receiving terminal has light intersection Wave decomposing multiplexer, it includes transmitting terminal and receiving terminal, described receiving terminal has two groups of 1:2 diplex demultiplexing devices and a light being connected by optical fiber with this 1:2 diplex demultiplexing device intersects Wave decomposing multiplexer, and it is the signal of two-way individual wavelengths that described 1:2 diplex demultiplexing device and described light intersect the light signal demultiplexing that Wave decomposing multiplexer all has a different wave length for Jiang Yi road.
Described light intersection Wave decomposing multiplexer is sparse light intersection Wave decomposing multiplexer, in described receiving terminal, 4 light signals that a road has a different wave length intersect the independently signal of telecommunication of Wave decomposing multiplexer, 1:2 diplex demultiplexing device and clock and data recovery demultiplexing Wei Si road through this sparse light successively.
What described sparse light intersected Wave decomposing multiplexer use is dielectric filter plate, and described 1:2 diplex demultiplexing device consists of dielectric filter plate and two coaxial packaging receivers.
When light intersection Wave decomposing multiplexer is sparse light intersection Wave decomposing multiplexer, described coaxial packaging receiver is the structure that p-i-n photodiode combines with transimpedance amplifier.
When light intersection Wave decomposing multiplexer is sparse light intersection Wave decomposing multiplexer, described coaxial packaging receiver is the structure that semiconductor optical amplifier combines with p-i-n photodiode and transimpedance amplifier, or described coaxial packaging receiver is APD.
Preferably, described light intersection Wave decomposing multiplexer is local area network (LAN) light intersection Wave decomposing multiplexer, in described receiving terminal, a road has 4 light signals of different wave length successively through this local area network (LAN) light intersection Wave decomposing multiplexer, 1:2 diplex demultiplexing device and 4:10 deserializer demultiplexing Wei Shi road separate electric signals.
What described local area network (LAN) light intersected Wave decomposing multiplexer use is dielectric filter plate, and described 1:2 diplex demultiplexing device consists of dielectric filter plate and two coaxial packaging receivers.
When light intersection Wave decomposing multiplexer is local area network (LAN) light intersection Wave decomposing multiplexer, described coaxial packaging receiver is the structure that p-i-n photodiode combines with transimpedance amplifier.
When light intersection Wave decomposing multiplexer is local area network (LAN) light intersection Wave decomposing multiplexer, described coaxial packaging receiver is the structure that semiconductor optical amplifier combines with p-i-n photodiode and transimpedance amplifier, or described coaxial packaging receiver is avalanche diode.
Preferably, described in each, before coaxial packaging receiver, be also placed with a filter plate that can filter the residue signal of other wavelength.
The CFP optical transceiver that receiving terminal of the present invention has light intersection Wave decomposing multiplexer is a kind of at the optical transceiver for 40G or 100G CFP (LR4 and ER4 type) communication system, this optical transceiver is simple in structure, the advantage that have low cost, easily encapsulates and easily produce in batches.In this structure, the CWDM of 4 wavelength (or LAN-WDM) light signal intersects Wave decomposing multiplexer demultiplexing two branch road light signals by light, and then two branch road light signals are the 4 road signals of telecommunication by 1:2DeMUX demultiplexing and are detected device and detect.Adopt technology of the present invention, can make receiving terminal cost to 1/5th to 1/10th of original technology.
Accompanying drawing explanation
Fig. 1 is the structural representation of traditional 40GBASE-LR4CFP optical transceiver;
Fig. 2 is the structural representation that receiving terminal of the present invention has the CFP optical transceiver embodiment mono-of light intersection Wave decomposing multiplexer;
Fig. 3 a is 1:2 diplex demultiplexing device structural representation one in the embodiment of the present invention one;
Fig. 3 b is 1:2 diplex demultiplexing device structural representation two in the embodiment of the present invention one;
Fig. 4 is that 1:2 diplex demultiplexing device and the CWDM light of receiving terminal in the embodiment of the present invention one intersects the composition structural representation of Wave decomposing multiplexer;
Fig. 5 is the structural representation of traditional 100GBASE-LR4CFP optical transceiver;
Fig. 6 is the structural representation that receiving terminal of the present invention has the CFP optical transceiver embodiment bis-of light intersection Wave decomposing multiplexer;
Fig. 7 is that 1:2 diplex demultiplexing device and the LAN-WDM light of receiving terminal in the embodiment of the present invention two intersects the composition structural representation of Wave decomposing multiplexer.
Embodiment
For ease of structure of the present invention and the effect that reaches are had to further understanding, now coordinate the accompanying drawing preferred embodiment that develops simultaneously to be described in detail as follows.
The CFP optical transceiver that receiving terminal of the present invention has light intersection Wave decomposing multiplexer includes transmitting terminal and receiving terminal, this receiving terminal has the 1:2 diplex demultiplexing devices (Modified Diplexer 1:2DeMUX) of two groups of improvement and a light being connected by optical fiber with 1:2 diplex demultiplexing device and intersects Wave decomposing multiplexer (De-interleaver), and it is the signal of two-way individual wavelengths that this 1:2 diplex demultiplexing device and light intersect the light signal demultiplexing that the equal Ke Jiang of Wave decomposing multiplexer mono-tunnel has two different wave lengths.
As shown in Figure 2, receiving terminal of the present invention has the CFP optical transceiver of light intersection Wave decomposing multiplexer for the CFP of 40G, as 40G BASE-LR4CFP, in this CFP optical transceiver, its receiving terminal comprises that the sparse light of a CWDM 20nm/40nm intersects the 1:2 diplex demultiplexing device (hereinafter to be referred as 1:2DeMUX) of Wave decomposing multiplexer (being CWDMDe-interleaver) and two improvement, and CWDM De-interleaver and 2 1:2DeMUX are positioned at the physical package of CFP.Receiving terminal Yi road has four kinds of different CWDM wavelength X 1, λ 2, λ 3, λ 4 (λ 1=1271 ± 6.5nm, λ 2=1291 ± 6.5nm, λ 3=1311 ± 6.5nm, λ 4=1331 ± 6.5nm) light signal, as shown in Figure 4, this light signal by CWDM De-interleaver after demultiplexing be that (λ 1 for two groups of light signals, λ 3 and λ 2, λ 4), as shown in Figure 3 a, wherein (λ 1 for light signal, λ 3) by one of them 1:2DeMUX demultiplexing, be two path signal λ 1, λ 3, as shown in Figure 3 b, (λ 2 for light signal, λ 4) by another 1:2DeMUX demultiplexing, be two path signal λ 2, λ 4, therefore, 1:2DeMUX after improveing by use, (λ 1 for 4 CWDM wavelength in an optical fiber, λ 2, λ 3, λ 4) light signal demultiplexing be the 4 road signals of telecommunication.What CWDM20nm/40nm light intersected Wave decomposing multiplexer use is dielectric filter plate, so cost is very low.Traditional light intersection Wave decomposing multiplexer is used three-dB coupler, the loss of at least many 2dB of scheme that use up intersection Wave decomposing multiplexer that can propose than the present invention like this, and this can cause meeting the performance requirement of CFP.Conventional 10G duplex demodulation multiplexer consists of TO-CAN (coaxial packaging) receiver and a TO-CAN transmitter.As shown in Fig. 3 a and Fig. 3 b, 1:2DeMUX in the present invention after improvement consists of dielectric filter plate 1 and two TO-CAN receivers (as PIN+TIA), and wherein filter plate 1 can be divided into two independently transmission paths (each wavelength is a transmission path) containing two wavelength Yi road light signals.Compare with traditional technical scheme, the low income of cost of the present invention is high, and is very applicable to large-scale production.
CFP optical transceiver receiving terminal structure of the present invention is small and exquisite, is easily placed on CFP/CFP2/CFP4.
As shown in Figure 6, the CFP optical transceiver that receiving terminal of the present invention has light intersection Wave decomposing multiplexer also can be used in 100G CFP/CFP2/CFP4, as 100G BASE-LR4CFP.In the optical transceiver of the present embodiment, the physical package of its receiving terminal the inside comprises the 1:2DeMUX of a local area network (LAN) light intersection Wave decomposing multiplexer (being LAN-WDM De-interleaver) and two improvement.Figure 7 shows that the 1:2DeMUX of receiving terminal in the embodiment of the present invention two and the composition structural representation of LAN-WDM De-interleaver, 1:2DeMUX consists of dielectric filter plate 1 and two TO-CAN transmitters (as PIN+TIA), and wherein filter plate 1 can be divided into two independently transmission paths (each wavelength is a transmission path) containing two wavelength Yi road light signals.As shown in Figures 6 and 7, at receiving terminal, a road includes four wavelength X 1, and λ 2, λ 3, λ 4 (λ 1=1295.56 ± 1.03nm, λ 2=1300.05 ± 1.04nm, λ 3=1304.58 ± 1.04nm, λ 4=1309.14 ± 1.05nm) light signal is that (λ 1 for two branch road light signals by LAN-WDM De-interleaver demultiplexing, λ 3 and λ 2, λ 4), each branch road light signal by 1:2DeMUX respectively demultiplexing be independently signal of telecommunication λ 1 and λ 3 and λ 2 and λ 4 of two-way.The TO-CAN receiver front end of 1:2DeMUX can be placed with extra filter plate, plays the effect of filtering other wavelength residual signals.
The transmitting terminal of 40GBASE-LR4CFP in the present invention also can adopt the structure that comprises CWDMinterleaver (sparse smooth Interleaver) and 2:1MUX (2:1 diplex multiplexer), the transmitting terminal of 100GBASE-LR4CFP also can adopt the structure that comprises LAN-WDM interleaver (local area network (LAN) light Interleaver) and 2:1MUX (2:1 diplex multiplexer), not shown.
40G BASE-ER4CFP can adopt the similar structure with 40GBASE-LR4CFP in the structure of receiving terminal, 40G BASE-ER4CFP detector adopts SOA+PIN+TIA (SOA:Semiconductor Optical Amplifier, semiconductor optical amplifier) or APD (Avalanche Photo Diode, avalanche diode) the PIN+TIA detector but not in 40G BASE-LR4CFP, not shown.The present invention also can be for 40G BASE-ER4CFP, the structure of its receiving terminal also can adopt the identical structure with 40G BASE-LR4CFP, use the 1:2DeMUX after CWDM De-interleaver and improvement, now the TO-CAN receiver of 1:2DeMUX is SOA+PIN+TIA or APD, not shown.The present invention also can be for 100G BASE-ER4 CFP, the structure of its receiving terminal also can adopt the structure that similarly has the 1:2DeMUX after LAN-WDM De-interleaver and improvement with 100GBASE-LR4CFP, but now the TO-CAN receiver of 1:2DeMUX is SOA+PIN+TIA or APD, not shown.
The CFP optical transceiver that receiving terminal of the present invention has light intersection Wave decomposing multiplexer is a kind of at the optical transceiver for 40G or 100G CFP (LR4 and ER4 type) communication system, this optical transceiver is simple in structure, the advantage that have low cost, easily encapsulates and easily produce in batches.In this structure, the CWDM of 4 wavelength (or LAN-WDM) light signal intersects Wave decomposing multiplexer demultiplexing two branch road light signals by light, and then two branch road light signals are the 4 road signals of telecommunication by 1:2DeMUX demultiplexing and are detected device and detect.Adopt technology of the present invention, can make receiving terminal cost to 1/5th to 1/10th of original technology.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.
Claims (10)
1. a receiving terminal has light and intersects the CFP optical transceiver of Wave decomposing multiplexer, it includes transmitting terminal and receiving terminal, it is characterized in that, described receiving terminal has two groups of 1:2 diplex demultiplexing devices and a light being connected by optical fiber with this 1:2 diplex demultiplexing device intersects Wave decomposing multiplexer, and described 1:2 diplex demultiplexing device consists of dielectric filter plate and two coaxial packaging receivers; It is the light signal that two-way comprises respectively λ 1, λ 3 and λ 2, λ 4 that light signal λ 1, λ 2, the λ 3 that one tunnel has four kinds of different wave lengths and λ 4 intersect Wave decomposing multiplexer demultiplexing by this light, wherein comprising λ 1, λ 3 Yi road light signals is independently light signal λ 1 and λ 3 of two-way through one of them 1:2 diplex demultiplexing device demultiplexing, and another road light signal that comprises λ 2, λ 4 is independently light signal λ 2 and λ 4 of other two-way through another 1:2 diplex demultiplexing device demultiplexing.
2. receiving terminal as claimed in claim 1 has the CFP optical transceiver of light intersection Wave decomposing multiplexer, it is characterized in that, described light intersection Wave decomposing multiplexer is sparse light intersection Wave decomposing multiplexer, in described receiving terminal, 4 light signal λ 1, λ 2, the λ 3 that a road has a different wave length and λ 4 intersect the independently signal of telecommunication of Wave decomposing multiplexer, 1:2 diplex demultiplexing device and clock and data recovery demultiplexing Wei Si road through this sparse light simultaneously successively.
3. the CFP optical transceiver with light Interleaver as claimed in claim 2, is characterized in that, what described sparse light intersected Wave decomposing multiplexer use is dielectric filter plate.
4. the CFP optical transceiver with light Interleaver as claimed in claim 3, is characterized in that, described coaxial packaging receiver is the structure that p-i-n photodiode combines with transimpedance amplifier.
5. the CFP optical transceiver with light Interleaver as claimed in claim 3, it is characterized in that, described coaxial packaging receiver is the structure that semiconductor optical amplifier combines with p-i-n photodiode and transimpedance amplifier, or described coaxial packaging receiver is APD.
6. receiving terminal as claimed in claim 1 has the CFP optical transceiver of light intersection Wave decomposing multiplexer, it is characterized in that, described light intersection Wave decomposing multiplexer is local area network (LAN) light intersection Wave decomposing multiplexer, in described receiving terminal, 4 light signal λ 1, λ 2, the λ 3 that a road has a different wave length and λ 4 intersect Wave decomposing multiplexer, 1:2 diplex demultiplexing device and 4:10 deserializer demultiplexing Wei Shi road separate electric signals through this local area network (LAN) light simultaneously successively.
7. receiving terminal as claimed in claim 6 has the CFP optical transceiver of light intersection Wave decomposing multiplexer, it is characterized in that, what described local area network (LAN) light intersected Wave decomposing multiplexer use is dielectric filter plate.
8. receiving terminal as claimed in claim 6 has the CFP optical transceiver of light intersection Wave decomposing multiplexer, it is characterized in that, described coaxial packaging receiver is the structure that p-i-n photodiode combines with transimpedance amplifier.
9. receiving terminal as claimed in claim 6 has the CFP optical transceiver of light intersection Wave decomposing multiplexer, it is characterized in that, described coaxial packaging receiver is the structure that semiconductor optical amplifier combines with p-i-n photodiode and transimpedance amplifier, or described coaxial packaging receiver is avalanche diode.
10. the receiving terminal as described in claim 3 or 7 has the CFP optical transceiver of light intersection Wave decomposing multiplexer, it is characterized in that, is also placed with a filter plate that can filter the residue signal of other wavelength described in each before coaxial packaging receiver.
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| CN102761386A (en) * | 2012-06-28 | 2012-10-31 | 武汉电信器件有限公司 | 100G CFP (c form-factor pluggable) optical module in support of two fixed speed rates |
| CN102761370A (en) * | 2012-06-28 | 2012-10-31 | 武汉电信器件有限公司 | 100G CFP (Computer Forms Printer) optical module capable of supporting various rates |
| CN104348553A (en) * | 2013-08-01 | 2015-02-11 | 深圳新飞通光电子技术有限公司 | Cfp optical transceiver module |
| CN103973372A (en) * | 2014-06-11 | 2014-08-06 | 武汉电信器件有限公司 | One hundred G CFP light module |
| CN106533571A (en) * | 2016-10-27 | 2017-03-22 | 中航海信光电技术有限公司 | Single port multi-channel integrated WDM transceiver optical module and optical fiber network system |
| CN106656341A (en) * | 2016-10-28 | 2017-05-10 | 辽宁工程技术大学 | Multichannel optical module and optical fiber communication system |
| CN110176960B (en) * | 2019-06-27 | 2023-11-17 | 成都光创联科技有限公司 | Novel single-fiber bidirectional multichannel input optical module |
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| WO2010134986A2 (en) * | 2009-05-20 | 2010-11-25 | Neophotonics Corporation | 40,50 and 100 gb/s optical transceivers/transponders in 300pin and cfp msa modules |
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