CN102231652B - C form-factor pluggable (CFP) optical transceiver with interleaver - Google Patents
C form-factor pluggable (CFP) optical transceiver with interleaver Download PDFInfo
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- CN102231652B CN102231652B CN201110185019.4A CN201110185019A CN102231652B CN 102231652 B CN102231652 B CN 102231652B CN 201110185019 A CN201110185019 A CN 201110185019A CN 102231652 B CN102231652 B CN 102231652B
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Abstract
The invention discloses a C form-factor pluggable (CFP) optical transceiver with an interleaver. The CFP optical transceiver comprises a transmitter and a receiver. The transmitter has two groups of 2:1 modified multiplexers and the interleaver connected with the 2:1 modified multiplexers by an optical fiber, wherein the 2:1 modified multiplexers and the interleaver are all used for coupling two paths of optical signals with different wavelengths into the same optical fiber for transmission. The CFP optical transceiver with the interleaver 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 multiplexed into two groups of optical signals by the 2:1 modified multiplexers (2:1MUX), and then the two groups of optical signals enter the same optical fiber by the interleaver. 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 light transmitting terminal with light Interleaver 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 LR4CFP) 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-LR4CFP optical transceiver.At transmitting terminal, four road CWDM (Coarse Wavelength Division Multiplexer, coarse wavelength division multiplexer) wavelength (is respectively 1271nm, 1291nm, 1311nm, 10Gbit/s 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 CWDM MUX (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, optical signals reception monomode fiber (SMFRX, 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) structure as far as possible little just extremely important.In order to reduce the size of transmitter, common way is to use integrated 4* (DML)+CWDM MUX, or uses the CWDM MUX+4 with tail optical fiber the separated DML with tail optical fiber of one.For 4* (DML)+CWDM MUX, there are two kinds of modes to realize, the one, with integrated AWG (Array Waveguide Grating, array waveguide grating) 4* (DML)+MUX, another kind is the free space optical system that use and DML are integrated together.For integrated 4* (DML)+CWDM MUX, encapsulation difficulty is larger, and supplier is few, and the packaging cost of integrated 4* (DML)+CWDM MUX is high in addition, and rate of finished products is low, is difficult to large-scale production.For small-sized CWDM MUX, be also faced with same problem, the high and very difficult large-scale production of cost.
Figure 5 shows that the traditional structure of 100GBASE-LR4CFP.At transmitting terminal, it is respectively the LAN-WDM of 25Gbit/s (Local Area Network-Wavelength Division Multiplexer that the light signal of transmission channel (TXLANE) Shi road 10Gbit/s becomes four tunnels 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 4:1LAN-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 4:10 deserializer (4:10Deserializer), by receive path (RXLANE), received, therefore keep that the size of LAN-WDM MUX 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 CFP optical transceiver with light Interleaver of applicable batch production.
For achieving the above object, the invention provides a kind of CFP optical transceiver with light Interleaver, it includes transmitting terminal and receiving terminal, the light Interleaver that described transmitting terminal has two groups of 2:1 diplex multiplexers and is connected by optical fiber with this 2:1 diplex multiplexer, described 2:1 diplex multiplexer and described smooth Interleaver all transmit for the light signal of two-way different wave length being coupled into an optical fiber.
Described smooth Interleaver is sparse smooth Interleaver, in described transmitting terminal, four road light signals are multiplexed in a transmitting monomode fiber and are transmitted by clock and data recovery, laser diode, described 2:1 diplex multiplexer and described sparse smooth Interleaver successively.
Preferably, when light Interleaver is sparse smooth Interleaver, the structure that described receiving terminal adopts p-i-n photodiode to be combined with transimpedance amplifier.
Preferably, when light Interleaver is sparse smooth Interleaver, the structure that described receiving terminal adopts semiconductor optical amplifier to be combined with p-i-n photodiode and transimpedance amplifier.
When light Interleaver is sparse smooth Interleaver, what described sparse smooth Interleaver was used is dielectric filter plate, described 2:1 diplex multiplexer consists of dielectric filter plate and two coaxial packaging transmitters, and this coaxial packaging transmitter is direct modulated laser.
Preferably, described smooth Interleaver is local area network (LAN) light Interleaver, in described transmitting terminal, ten road light signals become four road light signals by a 10:4 parallel-to-serial converter, then optical signals modulator drives and successively enters described 2:1 diplex multiplexer and described local area network (LAN) light Interleaver, and last optical multiplexed signal is used in a transmitting monomode fiber and transmitted.
When light Interleaver is local area network (LAN) light Interleaver, the structure that described receiving terminal adopts p-i-n photodiode to be combined with transimpedance amplifier.
When light Interleaver is local area network (LAN) light Interleaver, the structure that described receiving terminal adopts semiconductor optical amplifier to be combined with p-i-n photodiode and transimpedance amplifier, or described receiving terminal adopts avalanche diode.
When light Interleaver is local area network (LAN) light Interleaver, described 2:1 diplex multiplexer consists of dielectric filter plate and two coaxial packaging transmitters, and this coaxial packaging transmitter is direct modulated laser or Electroabsorption Modulated Laser.
Described receiving terminal adopts the structure that comprises light intersection Wave decomposing multiplexer and 1:2 diplex demultiplexing device, and this light intersection Wave decomposing multiplexer is sparse light intersection Wave decomposing multiplexer or local area network (LAN) light intersection Wave decomposing multiplexer.
The CFP optical transceiver that the present invention has light Interleaver 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 is multiplexed with two groups of light signals by 2:1MUX, and then two groups of light signals enter in an optical fiber by light Interleaver.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 the present invention has the CFP optical transceiver embodiment mono-of light Interleaver;
Fig. 3 a is 2:1 diplex multiplexer structural representation one in the embodiment of the present invention one;
Fig. 3 b is 2:1 diplex multiplexer structural representation two in the embodiment of the present invention one;
Fig. 4 is the 2:1 diplex multiplexer of transmitting terminal in the embodiment of the present invention one and the composition structural representation of CWDM light Interleaver;
Fig. 5 is the structural representation of traditional 100GBASE-LR4CFP optical transceiver;
Fig. 6 is the structural representation that the present invention has the CFP optical transceiver embodiment bis-of light Interleaver;
Fig. 7 a is the 2:1 diplex multiplexer of transmitting terminal in the embodiment of the present invention two and the composition structural representation one of LAN-WDM light Interleaver;
Fig. 7 b is the 2:1 diplex multiplexer of transmitting terminal in the embodiment of the present invention two and the composition structural representation two of LAN-WDM light Interleaver.
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 the present invention has light Interleaver includes transmitting terminal and receiving terminal, this transmitting terminal has the 2:1 diplex multiplexer (Modified Diplexer 2:1MUX) of two groups of improvement and the light Interleaver (Interleaver) being connected by optical fiber with 2:1 diplex multiplexer, and this 2:1 diplex multiplexer and light Interleaver all can be coupled into the light signal of two-way different wave length in an optical fiber and transmit.
As shown in Figure 2, the present invention has the CFP optical transceiver of light Interleaver for the CFP of 40G, as 40GBASE-LR4CFP, in this CFP optical transceiver, its transmitting terminal comprises the sparse smooth Interleaver (being CWDM interleaver) of a CWDM 20nm/40nm and the 2:1 diplex multiplexer (hereinafter to be referred as 2:1MUX) of two improvement, and CWDM interleaver and 2 2:1MUX are positioned at the physical package of CFP.Transmitting terminal You Si road 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) (10Gbit/s is only nominal value to 10Gbit/s, actual speed rate can be between 10-15Gbit/s) light signal, as shown in Fig. 3 a and Fig. 4, wherein λ 1 and λ 3 light signals are multiplexed with a road light signal by one of them 2:1MUX, as shown in Fig. 3 b and Fig. 4, λ 2 and λ 4 light signals are multiplexed with a road light signal by another 2:1MUX, (λ 1 for this two ways of optical signals, λ 3 and λ 2, λ 4) by sparse smooth Interleaver (CWDM interleaver), in an optical fiber, transmit.What CWDM 20nm/40nm light Interleaver was used is dielectric filter plate, so cost is very low.Traditional light Interleaver is used three-dB coupler, the loss of at least many 2dB of scheme with light Interleaver that can propose than the present invention like this, and this can cause meeting the performance requirement of CFP.Conventional 10G duplex multiplexer consists of TO-CAN (coaxial packaging) receiver and a TO-CAN transmitter.As shown in Fig. 3 a and Fig. 3 b, 2:1MUX in the present invention after improvement consists of dielectric filter plate 1 and two TO-CAN transmitters (as DML), and wherein filter plate can synthesize an independently transmission path (every optical fiber is a transmission path) the light signal that contains two wavelength.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 transmitting 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 the present invention has a light Interleaver also can be used in 100GCFP/CFP2/CFP4, as 100GBASE-LR4CFP.In the optical transceiver of the present embodiment, the physical package of its transmitting terminal the inside comprises the 2:1MUX of a local area network (LAN) light Interleaver (being LAN-WDM interleaver) and two improvement.Fig. 7 a is depicted as the 2:1MUX of transmitting terminal in the embodiment of the present invention two and the composition structural representation of LAN-WDM interleaver, 2:1MUX consists of dielectric filter plate 1 and two TO-CAN transmitters (as EML), and wherein filter plate can synthesize an independently transmission path (every optical fiber is a transmission path) the light signal that contains two wavelength.As shown in Fig. 6 and Fig. 7 a, at transmitting terminal, the light signal of ten road 10Gbit/s becomes four tunnels by a 10:4 parallel-to-serial converter, and respectively for 25Gbit/s, (bit-rates values 25G is only nominal value, actual speed rate can be between 25-32Gbit/s) LAN-WDM wavelength (1295.56nm, 1300.05nm, 1304.58nm, light signal 1309.14nm), then optical signals MD enters 2:1MUX, 4 road LAN-WDM wavelength X 1, 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) the TO-CAN transmitter by two 2:1MUX is multiplexed with two branch road light signals (λ 1, λ 3 and λ 2, λ 4), two branch road light signals are entered in an optical fiber and are transmitted by LAN-WDM interleaver.Fig. 7 b and Fig. 7 a difference be, in Fig. 7 b, the transmitter of 2:1MUX is DML TO-CAN transmitter.
In the present invention, also can adopt the structure that comprises CWDM De-interleaver (sparse light intersection Wave decomposing multiplexer) and 1:2DeMUX (1:2 diplex demultiplexing device) as the receiving terminal of 40GBASE-LR4CFP, the receiving terminal of 100GBASE-LR4CFP also can adopt the structure that comprises LAN-WDM De-interleaver (local area network (LAN) light intersect Wave decomposing multiplexer) and 1:2DeMUX (1:2 diplex demultiplexing device).
The present invention also can be for 40GBASE-ER4CFP, the structure of its transmitting terminal also can adopt the identical structure with 40GBASE-LR4CFP, use the 2:1MUX after CWDM interleaver and improvement, 40GBASE-ER4CFP detector (being receiving terminal) adopts SOA+PIN+TIA (SOA:Semiconductor Optical Amplifier, semiconductor optical amplifier) or APD (Avalanche Photo Diode, avalanche diode) but not PIN+TIA detector in 40GBASE-LR4CFP.The present invention also can be for 100GBASE-ER4CFP, the structure of its transmitting terminal also can adopt the structure that similarly has the 2:1MUX after LAN-WDM interleaver and improvement with 100GBASE-LR4CFP, PIN+TIA detector but 100GBASE-ER4CFP detector adopts SOA+PIN+TIA (SOA:Semiconductor Optical Amplifier, semiconductor optical amplifier) or APD in 100GBASE-LR4CFP.
The CFP optical transceiver that the present invention has light Interleaver 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 is multiplexed with two groups of light signals by 2:1MUX, and then two groups of light signals enter in an optical fiber by light Interleaver.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 CFP optical transceiver with light Interleaver, it includes transmitting terminal and receiving terminal, it is characterized in that, the light Interleaver that described transmitting terminal has two groups of 2:1 diplex multiplexers and is connected by optical fiber with this 2:1 diplex multiplexer, this 2:1 diplex multiplexer consists of dielectric filter plate and two coaxial packaging transmitters; One of them 2:1 diplex multiplexer is coupled into the light signal λ 1 of two-way different wave length, λ 3 in an optical fiber, another 2:1 diplex multiplexer is coupled into the light signal λ 2 of other two-way different wave length, λ 4 in another optical fiber, and this light Interleaver is coupled into four kinds of light signal λ 1 of different wave length in two optical fiber, λ 3 in the 3rd optical fiber and transmits with λ 2, λ 4.
2. the CFP optical transceiver with light Interleaver as claimed in claim 1, it is characterized in that, described smooth Interleaver is sparse smooth Interleaver, in described transmitting terminal, four road light signal λ 1, λ 2, λ 3 are multiplexed in a transmitting monomode fiber and are transmitted by clock and data recovery, laser diode, two described 2:1 diplex multiplexers and described sparse smooth Interleaver successively simultaneously with λ 4.
3. the CFP optical transceiver with light Interleaver as claimed in claim 2, is characterized in that, the structure that described receiving terminal adopts p-i-n photodiode to be combined with transimpedance amplifier.
4. the CFP optical transceiver with light Interleaver as claimed in claim 2, is characterized in that, the structure that described receiving terminal adopts semiconductor optical amplifier to be combined with p-i-n photodiode and transimpedance amplifier.
5. the CFP optical transceiver with light Interleaver as claimed in claim 2, is characterized in that, what described sparse smooth Interleaver was used is that this coaxial packaging transmitter of dielectric filter plate is direct modulated laser.
6. the CFP optical transceiver with light Interleaver as claimed in claim 1, it is characterized in that, described smooth Interleaver is local area network (LAN) light Interleaver, in described transmitting terminal, ten road light signals become four road light signal λ 1, λ 2, λ 3 and λ 4 by a 10:4 parallel-to-serial converter, then optical signals modulator drives and successively enters two described 2:1 diplex multiplexers and described local area network (LAN) light Interleaver, and last optical multiplexed signal is used in a transmitting monomode fiber and transmitted.
7. the CFP optical transceiver with light Interleaver as claimed in claim 6, is characterized in that, the structure that described receiving terminal adopts p-i-n photodiode to be combined with transimpedance amplifier.
8. the CFP optical transceiver with light Interleaver as claimed in claim 6, it is characterized in that, the structure that described receiving terminal adopts semiconductor optical amplifier to be combined with p-i-n photodiode and transimpedance amplifier, or described receiving terminal adopts avalanche diode.
9. the CFP optical transceiver with light Interleaver as claimed in claim 6, is characterized in that, this coaxial packaging transmitter is direct modulated laser or Electroabsorption Modulated Laser.
10. the CFP optical transceiver with light Interleaver as claimed in claim 1, it is characterized in that, described receiving terminal adopts the structure that comprises light intersection Wave decomposing multiplexer and 1:2 diplex demultiplexing device, and this light intersection Wave decomposing multiplexer is sparse light intersection Wave decomposing multiplexer or local area network (LAN) light intersection Wave decomposing multiplexer.
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| CN102496614A (en) * | 2011-11-25 | 2012-06-13 | 深圳市易飞扬通信技术有限公司 | Packaging structure and packaging method of collimated light device |
| CN102710334A (en) * | 2012-05-25 | 2012-10-03 | 武汉电信器件有限公司 | 40G CFP optical module for long-distance transmission |
| CN102750253A (en) * | 2012-06-06 | 2012-10-24 | 武汉电信器件有限公司 | Centum form factor pluggable (CFP) optical module and management data input/output (MDIO) interface communication method thereof |
| CN102833004A (en) * | 2012-08-23 | 2012-12-19 | 武汉电信器件有限公司 | 100G form-factor pluggable (CFP) optical module with transmission distance larger than 40 kilometers |
| CN103411668A (en) * | 2013-07-30 | 2013-11-27 | 武汉电信器件有限公司 | Optical power meter based on LAN-WDM wave band |
| US9967048B1 (en) * | 2016-10-14 | 2018-05-08 | Juniper Networks, Inc. | Optical transceiver with external laser source |
| CN106772816A (en) * | 2017-03-01 | 2017-05-31 | 武汉光迅科技股份有限公司 | A kind of structure and implementation method of two-forty planar optical waveguide |
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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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| 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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