CN102255669A - 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 relevant a kind of optical transceiver of the present invention is meant a kind of CFP optical transceiver that has light intersection Wave decomposing multiplexer at optical receiving end especially.
Background technology
In recent years, because the increase rapidly (for example cloud computing, the connection of router-to-router, the transmission of image) of the market demand, Fiber Optical Communication System is being upgraded to the speed of 40G, and 40G optical transceiver (Transponder) is a subsystem the most key in the 40G optical communication system.
The 40G optical transceiver need be used more more advanced than 10G optical transceiver, complexity and difficult technologies, 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 is as 40G BASE LR4 CFP) has the advantage of lower cost and long transmission distance.Because the quick increase of communication service demand, the 40G system has accounted for significant proportion in utility system, and also there is small-scale development in the 100G system.CFP is the common package dimension product that satisfies multi-source agreement, be used for the transmitting high speed digital signal, the CFP optical transceiver is applied in utility system, the CFP2 of littler package dimension and CFP4 optical transceiver are also developed, but the multi-source agreement that satisfies CFP2 and CFP4 is not also thoroughly finished.40GCFP/CFP2/CFP4 and 100G CFP/CFP2/CFP4 are the very important optical transceivers of client, in the CFP optical transceiver, it is highly important that transmitter and (or) receiver needs 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 finish multiplexing, be multiplexed in the emission monomode fiber (SMF TX, Single Mode Fiber TX); At receiving terminal, one road optical signals receive CWDM DeMUX (the use in sparse wave-division demultiplexing device) demultiplexing of monomode fiber (SMF RX, Single Mode Fiber) by a 1:4 be 4 CWDM wavelength (1271nm, 1291nm, 1311nm, 1331nm).Be four-way serial bus interface (XLAUI) at the light inputting end of transmitting terminal and the bright dipping end of receiving terminal, between the CDR of transmitting terminal and the LD and be physical medium associated layers interface (PMD service interface) between the CDR of receiving terminal and the 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 the p-i-n photodiode, and TIA is a 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), perhaps uses the PIN/TIA of CWDM DeMUX+4 of magnetic tape trailer fibre magnetic tape trailer fibre that separates of one.For CWDM DeMUX+4* (PIN/TIA), there is dual mode 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 usefulness and PIN/TIA are integrated together.For integrated CWDM DeMUX+4* (PIN/TIA), encapsulation difficulty is bigger, and supplier is few, the packaging cost height of integrated in addition CWDMDeMUX+4* (PIN/TIA), and rate of finished products is low, is difficult to large-scale production.Also be faced with same problem for small-sized CWDM DeMUX, 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, ten road light signals of transmission channel (TXLANE) become 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, 1309.14nm) light signal, and then successively by MD (modulators drives), an EML (Electro-Absorption Modulated Laser, Electroabsorption Modulated Laser) and a 4:1 LAN-WDM MUX (local area network (LAN)-wavelength division multiplexer) carry out multiplexed; At receiving terminal, light signal is by behind 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), receive by receive path (RXLANE) via PIN, TIA and 4:10 deserializer (4:10De-serializer), keep therefore that the size of LAN-WDM DEMUX+4* (PIN/TIA) is enough little just to seem particularly important.But the transmitting terminal of present 100GBASE-LR4CFP and the packaging cost height of receiving terminal, rate of finished products is low, and the cost height, is 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 suitable batch process 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 intersects Wave decomposing multiplexer with a light that this 1:2 diplex demultiplexing device is connected by optical fiber, and described 1:2 diplex demultiplexing device and described light intersect Wave decomposing multiplexer and all is used for Jiang Yilu and has the signal that the wavelength optical signals demultiplexing is the two-way individual wavelengths.
Described light intersection Wave decomposing multiplexer is sparse light intersection Wave decomposing multiplexer, in described receiving terminal, one tunnel 4 light signals with different wave length successively through should sparse light intersection Wave decomposing multiplexer, 1:2 diplex demultiplexing device and clock and data recovery demultiplexing be four tunnel signals of telecommunication independently.
What described sparse light intersected the Wave decomposing multiplexer use is the dielectric filter plate, and described 1:2 diplex demultiplexing device is made of dielectric filter plate and two coaxial packaging receivers.
Intersecting Wave decomposing multiplexer when light is sparse light when intersecting Wave decomposing multiplexer, and described coaxial packaging receiver is p-i-n photodiode and transimpedance amplifier structure combining.
Intersecting Wave decomposing multiplexer when light is sparse light when intersecting Wave decomposing multiplexer, and described coaxial packaging receiver is semiconductor optical amplifier and p-i-n photodiode and transimpedance amplifier structure combining, or described coaxial packaging receiver is APD.
Preferably, described light intersection Wave decomposing multiplexer is a local area network (LAN) light intersection Wave decomposing multiplexer, in described receiving terminal, one tunnel 4 light signals with different wave length are ten tunnel separate electric signals through this local area network (LAN) light intersection Wave decomposing multiplexer, 1:2 diplex demultiplexing device and 4:10 deserializer demultiplexing successively.
What described local area network (LAN) light intersected the Wave decomposing multiplexer use is the dielectric filter plate, and described 1:2 diplex demultiplexing device is made of dielectric filter plate and two coaxial packaging receivers.
When light intersection Wave decomposing multiplexer intersected Wave decomposing multiplexer for local area network (LAN) light, described coaxial packaging receiver was p-i-n photodiode and transimpedance amplifier structure combining.
When light intersection Wave decomposing multiplexer intersects Wave decomposing multiplexer for local area network (LAN) light, described coaxial packaging receiver is semiconductor optical amplifier and p-i-n photodiode and transimpedance amplifier structure combining, or described coaxial packaging receiver is an avalanche diode.
Preferably, also be placed with a filter plate that can filter the residue signal of other wavelength before each described coaxial packaging receiver.
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 that is used for 40G or 100G CFP (LR4 and ER4 type) communication system, this optical transceiver is simple in structure, the advantage that have low cost, encapsulates and produce in batches easily easily.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 two branch road light signals are 4 road signals of telecommunication by the 1:2DeMUX demultiplexing and are detected device and detect then.Adopt technology of the present invention, can make the receiving terminal cost be reduced to 1/5th to 1/10th of original technology.
Description of drawings
Fig. 1 is the structural representation of traditional 40GBASE-LR4CFP optical transceiver;
Fig. 2 has the structural representation of the CFP optical transceiver embodiment one of light intersection Wave decomposing multiplexer for receiving terminal of the present invention;
Fig. 3 a is a 1:2 diplex demultiplexing device structural representation one in the embodiment of the invention one;
Fig. 3 b is a 1:2 diplex demultiplexing device structural representation two in the embodiment of the invention one;
Fig. 4 is that 1:2 diplex demultiplexing device and the CWDM light of receiving terminal in the embodiment of the 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 has the structural representation of the CFP optical transceiver embodiment two of light intersection Wave decomposing multiplexer for receiving terminal of the present invention;
Fig. 7 is that 1:2 diplex demultiplexing device and the LAN-WDM light of receiving terminal in the embodiment of the 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 further understanding, the preferred embodiment that develops simultaneously of existing conjunction with figs. is 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 intersects Wave decomposing multiplexer (De-interleaver) with a light that 1:2 diplex demultiplexing device is connected by optical fiber, and this 1:2 diplex demultiplexing device and light intersect Wave decomposing multiplexer all can to have two wavelength optical signals demultiplexings with one the tunnel is the signal of two-way individual wavelengths.
As shown in Figure 2, receiving terminal of the present invention has light and intersects the CFP optical transceiver of Wave decomposing multiplexer and be used 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.A road of receiving terminal 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, the light signal of λ 4=1331 ± 6.5nm), 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), shown in Fig. 3 a, wherein (λ 1 for light signal, λ 3) be two path signal λ 1 by one of them 1:2DeMUX demultiplexing, λ 3, shown in Fig. 3 b, light signal (λ 2, and λ 4) is two path signal λ 2 by another 1:2DeMUX demultiplexing, λ 4, therefore, by using the 1:2DeMUX after the improvement, (λ 1, and λ 2 for 4 CWDM wavelength in optical fiber, λ 3, and λ 4) the light signal demultiplexing be 4 road signals of telecommunication.What CWDM20nm/40nm light intersected the Wave decomposing multiplexer use is the dielectric filter plate, so cost is very low.Traditional light intersects Wave decomposing multiplexer and uses three-dB coupler, can intersect the scheme of Wave decomposing multiplexer than using up of proposing of the present invention like this and many loss of 2dB at least, and this can cause satisfying the performance requirement of CFP.Conventional 10G duplex demodulation multiplexer is made of TO-CAN (coaxial packaging) receiver and a TO-CAN transmitter.Shown in Fig. 3 a and Fig. 3 b, 1:2DeMUX among the present invention after the improvement is made 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) to the road light signal that contains two wavelength.Compare with traditional technical scheme, cost of the present invention hangs down the income height, and very is fit to large-scale production.
CFP optical transceiver receiving terminal structure of the present invention is small and exquisite, is placed on CFP/CFP2/CFP4 easily.
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 among the 100G CFP/CFP2/CFP4, as 100G BASE-LR4CFP.In the optical transceiver of 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 invention two and the composition structural representation of LAN-WDM De-interleaver, 1:2DeMUX is made 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) to the road light signal that contains two wavelength.As Fig. 6 and shown in Figure 7, at receiving terminal, the one tunnel 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, the light signal of λ 4=1309.14 ± 1.05nm) 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 two independent signal of telecommunication λ 1 and λ 3 and λ 2 and λ 4.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 among the present invention also can adopt the structure that comprises CWDMinterleaver (sparse light intersection wavelength division multiplexer) 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 intersection wavelength division multiplexer) and 2:1MUX (2:1 diplex multiplexer), and is 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) but not the PIN+TIA detector among the 40G BASE-LR4CFP is not shown.The present invention also can be used for 40G BASE-ER4CFP, the structure of its receiving terminal also can adopt the identical structure with 40G BASE-LR4CFP, promptly use CWDM De-interleaver and the improvement after 1:2DeMUX, this moment, the TO-CAN receiver of 1:2DeMUX was SOA+PIN+TIA or APD, and is not shown.The present invention also can be used for 100G BASE-ER4 CFP, the structure of its receiving terminal also can adopt with 100GBASE-LR4CFP similarly the structure of 1:2DeMUX after LAN-WDM De-interleaver and the improvement, but this moment, the TO-CAN receiver of 1:2DeMUX was SOA+PIN+TIA or APD, and is 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 that is used for 40G or 100G CFP (LR4 and ER4 type) communication system, this optical transceiver is simple in structure, the advantage that have low cost, encapsulates and produce in batches easily easily.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 two branch road light signals are 4 road signals of telecommunication by the 1:2DeMUX demultiplexing and are detected device and detect then.Adopt technology of the present invention, can make the receiving terminal cost be reduced to 1/5th to 1/10th of original technology.
The above is preferred embodiment of the present invention only, is not to be used 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 intersects Wave decomposing multiplexer with a light that this 1:2 diplex demultiplexing device is connected by optical fiber, and described 1:2 diplex demultiplexing device and described light intersect Wave decomposing multiplexer and all is used for Jiang Yilu and has the signal that the wavelength optical signals demultiplexing is the two-way individual wavelengths.
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, one tunnel 4 light signals with different wave length successively through should sparse light intersection Wave decomposing multiplexer, 1:2 diplex demultiplexing device and clock and data recovery demultiplexing be four tunnel signals of telecommunication independently.
3. the CFP optical transceiver with light intersection wavelength division multiplexer as claimed in claim 2, it is characterized in that, what described sparse light intersected the Wave decomposing multiplexer use is the dielectric filter plate, and described 1:2 diplex demultiplexing device is made of dielectric filter plate and two coaxial packaging receivers.
4. the CFP optical transceiver with light intersection wavelength division multiplexer as claimed in claim 3 is characterized in that described coaxial packaging receiver is p-i-n photodiode and transimpedance amplifier structure combining.
5. the CFP optical transceiver with light intersection wavelength division multiplexer as claimed in claim 3, it is characterized in that, described coaxial packaging receiver is semiconductor optical amplifier and p-i-n photodiode and transimpedance amplifier structure combining, 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 a local area network (LAN) light intersection Wave decomposing multiplexer, in described receiving terminal, one tunnel 4 light signals with different wave length are ten tunnel separate electric signals through this local area network (LAN) light intersection Wave decomposing multiplexer, 1:2 diplex demultiplexing device and 4:10 deserializer demultiplexing 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 the Wave decomposing multiplexer use is the dielectric filter plate, and described 1:2 diplex demultiplexing device is made of dielectric filter plate and two coaxial packaging receivers.
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 p-i-n photodiode and transimpedance amplifier structure combining.
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 semiconductor optical amplifier and p-i-n photodiode and transimpedance amplifier structure combining, or described coaxial packaging receiver is an avalanche diode.
10. have light as claim 3 or 7 described receiving terminals and intersect the CFP optical transceiver of Wave decomposing multiplexer, it is characterized in that, also be placed with a filter plate that can filter the residue signal of other wavelength before each described coaxial packaging receiver.
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| CN201110185016.0A CN102255669B (en) | 2011-07-04 | 2011-07-04 | C form-factor pluggable (CFP) transponder with interleaver at receiver |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN103973372A (en) * | 2014-06-11 | 2014-08-06 | 武汉电信器件有限公司 | One hundred G CFP light module |
| 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 |
| 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 |
| CN110176960A (en) * | 2019-06-27 | 2019-08-27 | 成都光创联科技有限公司 | A kind of novel single fiber bi-directional multichannel input optical module |
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| US20060291861A1 (en) * | 2005-06-23 | 2006-12-28 | Samsung Electronics Co.; Ltd | WDM PON with interleaver |
| 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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Patent Citations (2)
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| US20060291861A1 (en) * | 2005-06-23 | 2006-12-28 | Samsung Electronics Co.; Ltd | WDM PON with interleaver |
| 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 |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
| CN110176960A (en) * | 2019-06-27 | 2019-08-27 | 成都光创联科技有限公司 | A kind of novel single fiber bi-directional multichannel input optical module |
| 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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