CN102572621A - Optical module and wavelength division multiplexing system - Google Patents

Abstract

The invention provides an optical module and a wavelength division multiplexing system. The optical module comprises a photoelectric conversion module and an electro-optical conversion module. The photoelectric conversion module comprises an optical demultiplexing unit (ODU) and M photoelectric conversion units. The ODU is used to divide a received optical signal into M-channel optical signals with a specific rate and output to the corresponding photoelectric conversion units respectively. The photoelectric conversion units are used to convert the received optical signal into an electric signal and then output the electric signal. The electro-optical conversion module comprises M N wave compatible electro-optical conversion units and an optical multiplexing unit (OMU). The electro-optical conversion units are used to modulate the received electric signal into the optical signals with a corresponding wavelength and then output to the OMU. The OMU is used to carry out the multiplexing on the received optical signals and then output the signals. According to the invention, by using the minimum number of the optical modules and with lowest cost and most flexible configuration, the whole dense wavelength division multiplexing (DWDM) and coarse wavelength division multiplexing (CWDM) wave bands can covered.

Description

A kind of optical module and wavelength-division multiplex system

Technical field

The present invention relates to the optical communication field; Particularly relate to a kind of multichannel optical module of realizing multi-wavelength tunable; Relate in particular to the DWDM backbone network system and CWDM (Coarse Wavelength Division Multiplexing, the CWDM) metropolitan area network system in optical communication field.

Background technology

In the prior art in optical communication system; Separate channels is many, OMU in the single channel (Optical Multiplexing Unit, Optical Multiplexer Unit) and ODU (Optical Demultiplexing Unit; Optical Demultiplexing Unit); Discrete device such as optical fiber splice and fiber coupler is many, and the optical communication terminal equipment occupation space is big, and power consumption is big; In addition, traditional DWDM (Dense Wavelength Division Multiplexing, intensive multiplexed optical wave is used) system; Transmitting terminal will cover 96 ripples; Will 96 modules, and each module be because the difference of wavelength must be selected fixing laser for use, and the application module number is many; Configurable flexibility ratio is poor, and cost is high.

Present stage, system configuration was as shown in Figure 1 in the DWDM wavelength-division system, use discrete multichannel OMU and ODU to be used for multiplexing and demultiplexing, and every in addition passage all needs an optical fiber and two optical convering units (OTU).Need nearly 192 or 160 optical convering units in the 96 traditional like this ripples or the main line of 80 ripple dwdm systems, 192 or 160 fixed wave length optical modules; Thereby system complex, power consumption are very big, and very flexible, and power system capacity upgrading difficulty is big.

Summary of the invention

The technical problem that the present invention will solve provides a kind of optical module, and with the minimum optical module of number, minimum cost and configuration the most flexibly cover the wave band of whole DWDM and CWDM.

In order to solve the problems of the technologies described above, the invention provides a kind of optical module, comprising: photoelectricity conversion module and electric light conversion module,

Said photoelectricity conversion module comprises: Optical Demultiplexing Unit and M photoelectricity conversion unit, wherein,

Said Optical Demultiplexing Unit is used for the light signal that receives is divided into the light signal of M road special speed, exports to corresponding photoelectricity conversion unit respectively;

Said photoelectricity conversion unit is used for the light signal that receives is converted into the signal of telecommunication, then output;

Said electric light conversion module comprises: but the electric light conversion unit and the Optical Multiplexer Unit of M N ripple harmony, wherein,

Said electric light conversion unit is used for respectively the signal of telecommunication that receives being modulated into the light signal of corresponding wavelength, exports to said Optical Multiplexer Unit then;

Said Optical Multiplexer Unit is used for the light signal that receives is closed ripple, output then,

Wherein, N＞1, M＞1.

Further, above-mentioned optical module also has following characteristics: said photoelectricity conversion module also comprises:

Processing unit is used for the signal of telecommunication of said M photoelectricity conversion unit output is carried out exporting after shaping is handled.

Further, above-mentioned optical module also has following characteristics:

Said photoelectricity conversion unit comprises respectively: the receiver of 1 assigned rate and 1 trans-impedance amplifier.

Further, above-mentioned optical module also has following characteristics:

Said Optical Demultiplexing Unit is the periodicity optical branching filter.

Further, above-mentioned optical module also has following characteristics: said electrooptic switching element also comprises:

Processing unit after being used for respectively the M road signal of telecommunication that receives being carried out the shaping amplification, is exported to corresponding said electric light conversion unit respectively.

Further, above-mentioned optical module also has following characteristics:

Comprise an Electroabsorption Modulated Laser in each said electric light conversion unit.

In order to address the above problem, the present invention also provides a kind of intensive light wave multiplex system, comprise, and 2R above-mentioned optical module, wherein,

R first optical module is exported after being used for respectively the M road signal of telecommunication that receives is converted into the M route trackside light signal of this system's corresponding wavelength;

R second optical module, be used to receive M route trackside light signal after, export after M route trackside light signal is converted into the M road signal of telecommunication.

Further, above-mentioned intensive light wave multiplex system also has following characteristics:

N equals 8, and M equals 10, and R equals 8; Perhaps

N equals 8, and M equals 12, and R equals 8; Perhaps

N equals 10, and M equals 8, and R equals 10; Perhaps

N equals 12, and M equals 8, and R equals 12; Perhaps

N equals 96, and M equals 4, and R equals 24; Perhaps

N equals 96, and M equals 8, and R equals 12; Perhaps

N equals 96, and M equals 12, and R equals 8.

In order to address the above problem, the present invention also provides a kind of coarse wavelength division multiplexing systems, comprises 2R above-mentioned optical module, wherein,

R first optical module is exported after being used for respectively the M road signal of telecommunication that receives is converted into the M route trackside light signal of the corresponding wavelength of this system;

R second optical module, be used to receive M route trackside light signal after, export after M route trackside light signal is converted into the M road signal of telecommunication.

Further, above-mentioned coarse wavelength division multiplexing systems also has following characteristics: N equals 8, and M equals 8, and R equals 1.

To sum up, the present invention provides a kind of optical module, can use the minimum optical module of number, configuration minimum cost and cover the wave band of whole DWDM and CWDM the most flexibly.The present invention has used PIC (Photonic Integrated Circuit, photon integrated optical circuit) technology, and the optical channel of a plurality of separations is incorporated in the individual module subsystem, has improved the integrated level of light mouth.Can select single pass tunable wavelength to count N flexibly, and photoelectricity port number M, thereby with the minimum optical module of number, minimum cost and configuration the most flexibly cover the wave band of whole DWDM, can be widely used in following backbone network.This invention also can be counted the port number M of N and optical module through the tunable wavelength of configuration optical device, is applied to the CWDM system, is applied to Access Network, in the metropolitan area network.

Description of drawings

Fig. 1 is the sketch map of the N wavelength dwdm system of prior art.

Fig. 2 is the sketch map of the optical module of the embodiment of the invention.

Fig. 3 is the basic principle figure that the function of the optical module of the embodiment of the invention realizes.

Fig. 4 is a sketch map of using the dwdm system that the optical module of the embodiment of the invention makes up.

Fig. 5 is the sketch map of the dwdm system of the embodiment of the invention one.

Fig. 6 is the sketch map of the optical module in the dwdm system of the embodiment of the invention one.

Embodiment

For making the object of the invention, technical scheme and advantage clearer, hereinafter will combine accompanying drawing that embodiments of the invention are elaborated.Need to prove that under the situation of not conflicting, embodiment among the application and the characteristic among the embodiment be combination in any each other.

The core light device of the optical module of present embodiment has mainly adopted the PIC technology; PIC is a photonic integrated circuits; Adopt the mode of high integration; In discrete sets of elements Cheng Zaiyi encapsulation such as receiver, periodicity channel-splitting filter or tunable laser, periodicity wave multiplexer, refrigerator, realize the purpose of reducing power consumption, volume, cost.The optical module of present embodiment is packaged into two PIC devices with main receiver and laser and wave multiplexer, channel-splitting filter; One is used for receiving terminal; As shown in Figure 2, the optical module of present embodiment comprises: a photoelectricity conversion module and the electric light conversion module as the EO passage as the OE passage is arranged, and the OE passage is the light signal that receiver is received to be converted into the signal of telecommunication give interface connector; Be exactly to give veneer, the EO passage is exactly that the signal of telecommunication with veneer is output into light signal through laser modulation.

Periodically wave multiplexer, periodicity channel-splitting filter are meant that same port can be the light ofλ 1 to λ n through wavelength, also can be through the light of (λ 1+T) to (λ n+T), and wherein T is the cycle.

As shown in Figure 2, the OE conversion module comprises: Optical Demultiplexing Unit and M photoelectricity conversion unit, wherein,

Said Optical Demultiplexing Unit is used for the light signal that receives is divided into the light signal of M road special speed, exports to corresponding photoelectricity conversion unit respectively;

Said photoelectricity conversion unit is used for the light signal that receives is converted into the signal of telecommunication, then output;

Said electric light conversion module comprises: but the electric light conversion unit and the Optical Multiplexer Unit of M N ripple harmony, wherein,

Said electric light conversion unit is used for respectively the signal of telecommunication that receives being modulated into the light signal of corresponding wavelength, exports to said Optical Multiplexer Unit then;

Wherein, comprise an Electroabsorption Modulated Laser in each said electric light conversion unit.

Said Optical Multiplexer Unit is used for the light signal that receives is closed ripple, output then,

Wherein, N＞1, M＞1.

Wherein, said OE conversion module also comprises: processing unit is used for the signal of telecommunication of said M photoelectricity conversion unit output is carried out exporting after shaping is handled.

Wherein, said EO conversion module also comprises: processing unit, after being used for respectively the M road signal of telecommunication that receives being carried out the shaping amplification, export to corresponding laser respectively.

Said photoelectricity conversion unit comprises receiver and 1 TIA (Trans-impedance amplifier, trans-impedance amplifier) of 1 assigned rate respectively.Optical branching filter is M road special speed grade light signal in interior part with said light signal; Receiver and the TIA corresponding by respective rate are converted into the signal of telecommunication with light signal; The M road signal of telecommunication is through the shaping of clock and data recovery unit; Export to HOST (veneer) through electrical interface, shown in Fig. 3 top.

Shown in Fig. 3 lower part; The M road signal of telecommunication by the HOST input; Through the shaping regeneration of clock recovery unit and the high frequency compensation of equalizer, after laser driver drives amplification, laser is modulated again, accomplish the electric light conversion; The M road light signal that is assigned at last on the specified wavelength passage passes through recovery usefulness, is exported by optical fiber.

Transmitter side (being the EO conversion module in the present embodiment) is divided into: transmitter side clock and data recovery unit (TXCDR), EA (electro-absorption modulation) laser driver (DRIVER) and transmitter side PIC (TXPIC); Various performance collections and alarm report are accomplished by MCU (Micro Controller Unit, micro-control unit) and FPGA (Field Programmable Gate Array, field programmable gate array).

Fig. 4 is the sketch map of the wavelength-division multiplex system of the embodiment of the invention; As shown in Figure 4; Can make up wavelength-division multiplex system with the optical module of 2R present embodiment; For example, can or regulate the wavelength of the laser modulation of each passage in the optical module, make up dwdm system or CWDM system through configuration.

The difference of dwdm system and CWDM system is: the number of wavelengths of dwdm system is many, and CWDM system wavelength number is few; The frequency interval of dwdm system adjacent wave long-channel is less than 100G, and the CWDM system be greater than 100G, sparse a lot, can realize so function through laser configurations particularly.

The wavelength-division multiplex system of present embodiment comprises 2R above-mentioned optical module, wherein,

R optical module is used for exporting behind the M route trackside light signal with the M road signal of telecommunication conversion corresponding wavelength that receives respectively;

R optical module, be used to receive M route trackside light signal after, export after M route trackside light signal is converted into the M road signal of telecommunication.

Optical module in the present embodiment has M passage; Each laser is tunable N wavelength of one-tenth (this N wavelength is not continuous); Be exactly that optical module has M receiver and M laser, if laser all is non-tunable M wavelength (such as M=8) that just only covered like this, if but each laser is a N property period of wave tunable laser; Each laser can be adjusted to N wavelength on request, and (such as N=12) so just covered 96 wavelength.Such as being 80 wave systems systems 10 groups by 8 wavelength one components, adopt so the laser of the first via of the optical module of M=8 passage require can be tuned to first wavelength of every group in these 10 groups, i.e. N=10, other forwards.

The optical module of present embodiment has following advantage:

At first, the OEO of multi-wavelength very cheaply (photoelectricity light) switching device that utilizes PIC technology to realize, integrated a plurality of DWDM paths; Compared with prior art, has higher single channel capacity, energy-conservation degree and reliability; Lower failure risk; Cost, and simpler installation procedure, occupation area of equipment still less.

Then need reach 160 or 192 optical modules that are used for optical convering unit in 80 traditional ripples or the 96 ripple dwdm systems, 160 or 192 physics light mouths; And by contrast, the embodiment of the invention only just can realize same capacity with 160/N or 192/N such minimum system, has practiced thrift power consumption so to greatest extent.Because service dispatching is transformed into electric territory from the light territory; Optical fiber encapsulation quantity and wire jumper quantity obviously reduce; What the optical module of present embodiment met with when mounted connects the failure that causes also still less because of unstable or unclean optical fiber; The also corresponding reduction of system failure rate is more than 87.5%, and volume reduces more than 80%; Except the simple advantage of system, the client is installing, is planning and using the time of this optical module networking to be merely 1/4th of prior art.The optical module of present embodiment need not trigger clock in addition, and each service signal of single channel self adaptation respective rate grade can carry different business types, flexible configuration simultaneously.

Secondly; Because what PIC was integrated is many ripples tunable laser; Except reducing the module number of whole system, can also reduce the wavelength kind and the code quantity of optical module to greatest extent, because an optical module can cover whole 80 ripples or 96 ripples through tuning; So whole system is only used a kind of optical module, can greatly reduce the complexity of producing and purchasing.

A kind of optical module that present embodiment provides can successfully be realized single fiber DWDM networking; Make the complexity of the optical link of DWDM reduce to minimum; Overcome optical link optical channel and the various disadvantage of discrete device in the prior art, eliminated the huge veneer of photonic devices such as being loaded with OMU and ODU, except realizing the purpose of reducing power consumption, volume, cost; Improve the flexibility of system configuration, also realized minimizing of dwdm system terminal simultaneously; Also can be through the monochromatic light module construction CWDM system of present embodiment.

Can carry out the dwdm system of secondary multiplexing through the optical module of present embodiment like Fig. 4, only need N this optical module.

The optical module of a present embodiment is that M passage N ripple is tunable; Be N the wavelength that can configure appointment on each passage by software arrangements; Be used in the wavelength that just accesses formulation on the wavelength end of different grouping; Lift an actual application; 8 passage optical modules can output wavelength 192.9THZ～193.6THZ, also can export other group wavelength such as the THZ of 193.7～194.4......, (192.9+0.8*N) THZ～(193.6+0.8*N), so the laser of first passage be can be tuned to 192.9,193.7, N ripple such as 192.9+0.8*N is tunable

Transmit in branch composite wave to an optical fiber of grouping wavelength through multiplexer of optical module output; The light amplification through OA on the way comes the compensation power loss; And carry out professional scheduling up and down through some OADM websites, tell through the grouping demodulation multiplexer and respectively organize wavelength and give each optical module.

Therefore; A kind of optical module as shown in Figure 2 is provided, can improves photoelectricity passage integrated level, and simultaneously every passage integrated optical module that can carry out the N tunable wave length can constitute the minimum subsystem of DWDM; Can cover full DWDM wave band (number of wavelengths=N * M); And needn't carry out the wavelength configuration on the system schema, any light mouth is only used with a kind of optical module, and only uses N optical module; Thereby the complexity of the optical link of DWDM is reduced to minimum, realize the multipurpose of reducing power consumption, volume, cost, networking time, system upgrade difficulty.

Embodiment one: N=8, M=10

As shown in Figure 5, present embodiment is that the tunable module application of 10 passages, 8 ripples is 80 ripple dwdm system block diagrams, (N=8 is the tunable wavelength number of single channel laser, and M=10 is the port number of single module), and the single channel bandwidth is 10G.Because the optical device of inside modules is integrated periodically wave multiplexer, only need pass through the very little grouping wave multiplexer of volume (two OGMD (light grouping channel join-splitting device) are actually a miniaturization veneer) in advance so export to two groups of signals that OCI (light interleave unit) interleaves wavelength.Whole system only needs 16 modules of the same race just to make up the DWDM backbone network system of 80 ripples like this.

Constructing system needs can to decide according to the wave number of aggregate demand and the port number of each optical module with several optical modules, for example, can utilize the optical module of 8 present embodiments to make up the DWDM backbone network system etc. of 40 ripples.Tunable character as for laser is embodied in flexible Application and configurability, when preparing product, only produces a kind of configuration and gets final product, and other wavelength that need can access through software.

As shown in Figure 6, the optical module of present embodiment mainly is made up of following receiver side and transmitter side two parts, and receiver side is divided into: receiver side PIC device (RXPIC), receiver side clock and data recovery unit (RXCDR); Transmitter side is divided into: transmitter side clock and data recovery unit (TXCDR), EA laser driver (DRIVER) and transmitter side PIC device (TXPIC); Various performance collections and alarm report are accomplished by MCU and FPGA.

Receiving unit mainly is made up of RXPIC (being made up of receiver and optical branching filter), RXCDR:

The multiplexing optical signal of the 10*10Gb/s that the RXPIC receiving front-end is sent here (or FEC speed); It at first is the light signal of 10 tunnel parallel 10Gb/s through AWG_DEMUX (Optical Demultiplexing) partial wave; Pass through PIN (photodiode) again and convert the signal of telecommunication to, the limiting amplifier after next independently the signal of telecommunication is sent into respectively by the inner transreactance amplifier amplification back output M road of RXPIC receiving unit among the level RXCDR.Signal carries out data clock again and recovers in RXCDR after the shaping of limiting amplifier amplitude limit; And the difference high-speed electrical signals of line output 10 road 10Gb/s; And by microcontroller realization receiving terminal power monitoring; Decision threshold adjustment, receiving end signal are lost performance collection such as alarm, receiving terminal losing lock, LOF alarm and are reported.

Transmitting section mainly is made up of TXCDR, laser driver, TXPIC and temperature, wavelength, power control unit:

TXCDR receives 10 tunnel independence 10Gb/s high-speed-differential signals of telecommunication from Host Board (veneer) respectively; And to carry out integer regeneration through high speed 10Gb/s signal than long transmission line; And then after laser driver drives amplification, send into TXPIC and accomplish electricity/light conversion by the inner integrated laser of TXPIC, through AWG 10 road light signals are closed ripple more at last and be multiplexed with the output of one road light signal.

The inner EA absorbing light modular assembly that uses of the optical module of present embodiment is as the electric light retransmission unit, and power control, wavelength control all realize control through the optical module internal microprocessor, and the significant data of optical module stores among the Flash of inside modules (flash memory).

Embodiment two: N=8, and M=12,

In the present embodiment, the tunable module application of 12 passages, 8 ripples is in 96 ripple dwdm system main lines, and (N=8 is the tunable wavelength number of single channel laser, and M=12 is the port number of single module), the single channel bandwidth is 10G.Because the optical device of inside modules is integrated periodically wave multiplexer, only need pass through the very little grouping wave multiplexer of volume (two OGMD are actually a miniaturization veneer) in advance so export to two groups of signals that OCI interleaves wavelength.Whole system only needs 16 modules of the same race just to make up the DWDM backbone network system of 96 ripples like this.

Embodiment three: N=10, M=8

Present embodiment can make up the DWDM backbone network system of 80 ripples through 20 optical modules.

Embodiment four: N=12, M=8

Present embodiment can make up the DWDM backbone network system of 96 ripples through 24 optical modules.

Embodiment five: N=96, M is any

Each laser in the present embodiment all is that 96 ripples are tunable; Each laser can both be adjusted to 96 wavelength that need; The port number M (M is not equal to 1, has been exactly the single channel optical module because equal 1) of planning in theory just can be any when optical module designed like this.If M=4, an end of building 96 wave systems system so needs 24 optical modules, wants 48 optical modules altogether; If M=8, an end of building 96 wave systems system so needs 12 modules, if the port number M of module can accomplish 12, an end of building 96 wave systems system so needs 8 modules.

Embodiment six: when M=8, can use two present embodiment optical modules to make up the CWDM system of 8 ripples.

In this case, laser can be used the tunable optical module of 8 ripples, and this 8 channel module is used like this all is the same laser, each laser respectively be tuned to the wavelength of CWDM.

Certainly, above-mentioned each embodiment only is an example, and the N of the optical module among the embodiment, the value of M are not limited to the foregoing description, can design and dispose according to the embodiment needs.

One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to accomplish through program, said program can be stored in the computer-readable recording medium, like read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each the module/unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.

More than be merely the preferred embodiments of the present invention; Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof, those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (10)

1. optical module comprises: photoelectricity conversion module and electric light conversion module,

Said photoelectricity conversion module comprises: Optical Demultiplexing Unit and M photoelectricity conversion unit, wherein,

Said Optical Demultiplexing Unit is used for the light signal that receives is divided into the light signal of M road special speed, exports to corresponding photoelectricity conversion unit respectively;

Said photoelectricity conversion unit is used for the light signal that receives is converted into the signal of telecommunication, then output;

Said electric light conversion module comprises: but the electric light conversion unit and the Optical Multiplexer Unit of M N ripple harmony, wherein,

Said electric light conversion unit is used for respectively the signal of telecommunication that receives being modulated into the light signal of corresponding wavelength, exports to said Optical Multiplexer Unit then;

Said Optical Multiplexer Unit is used for the light signal that receives is closed ripple, output then,

Wherein, N＞1, M＞1.

2. optical module as claimed in claim 1 is characterized in that: said photoelectricity conversion module also comprises:

Processing unit is used for the signal of telecommunication of said M photoelectricity conversion unit output is carried out exporting after shaping is handled.

3. optical module as claimed in claim 1 is characterized in that:

Said photoelectricity conversion unit comprises respectively: the receiver of 1 assigned rate and 1 trans-impedance amplifier.

4. like each described optical module of claim 1-3, it is characterized in that:

Said Optical Demultiplexing Unit is the periodicity optical branching filter.

5. optical module as claimed in claim 1 is characterized in that: said electrooptic switching element also comprises:

Processing unit after being used for respectively the M road signal of telecommunication that receives being carried out the shaping amplification, is exported to corresponding said electric light conversion unit respectively.

6. optical module as claimed in claim 1 is characterized in that:

Comprise an Electroabsorption Modulated Laser in each said electric light conversion unit.

7. an intensive light wave multiplex system comprises, 2R is individual like each described optical module of claim 1-5, wherein,

R first optical module is exported after being used for respectively the M road signal of telecommunication that receives is converted into the M route trackside light signal of this system's corresponding wavelength;

R second optical module, be used to receive M route trackside light signal after, export after M route trackside light signal is converted into the M road signal of telecommunication.

8. intensive light wave multiplex system as claimed in claim 7 is characterized in that:

N equals 8, and M equals 10, and R equals 8; Perhaps

N equals 8, and M equals 12, and R equals 8; Perhaps

N equals 10, and M equals 8, and R equals 10; Perhaps

N equals 12, and M equals 8, and R equals 12; Perhaps

N equals 96, and M equals 4, and R equals 24; Perhaps

N equals 96, and M equals 8, and R equals 12; Perhaps

N equals 96, and M equals 12, and R equals 8.

9. a coarse wavelength division multiplexing systems comprises, 2R is individual like each described optical module of claim 1-5, wherein,

R first optical module is exported after being used for respectively the M road signal of telecommunication that receives is converted into the M route trackside light signal of the corresponding wavelength of this system;

R second optical module, be used to receive M route trackside light signal after, export after M route trackside light signal is converted into the M road signal of telecommunication.

10. coarse wavelength division multiplexing systems as claimed in claim 9 is characterized in that:

N equals 8, and M equals 8, and R equals 1.

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