CN102572620A - Optical module and optical wave multiplexing system - Google Patents
Optical module and optical wave multiplexing system Download PDFInfo
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Abstract
The invention relates to an optical module and an optical wave multiplexing system. The invention provides an optical module which is integrated with a first module and comprises a first wave dividing unit, a first photoelectric conversion unit, a first processing unit, a first electro-optic conversion unit and a first wave combining unit, wherein the first wave dividing unit is used for dividing a received optical signal of a first waveband into N wave light signals and then outputting the N wave light signals to the first photoelectric conversion unit; the first photoelectric conversion unit is used for converting the received N wave light signals into N paths of electric signals respectively and then outputting the N paths of electric signals to the first processing unit; the first processing unit is used for processing the received N paths of electric signals, and converting the N paths of electric signals into M paths of electric signals, and then outputting the M paths of electric signals to the first electro-optic conversion unit; the first electro-optic conversion unit is used for converting the received M paths of electric signals into M paths of optical signals of a second waveband, and then outputting to the first wave combining unit; and the first wave combining unit is used for outputting the M paths of optical signals after wave combination. In the invention, the PIC (photonic integrated circuit) technique is applied, and a plurality of separated optical channels are integrated into a single module sub-system, thereby improving the integration level of an optical port.
Description
Technical field
The present invention relates to the optical communication field; Particularly relate to a kind of application Transceiver (transmitting-receiving unification) PIC (Photonic Integrated Circuit; Photonic integrated circuits) the multichannel light module of technology; Relate in particular to the light wave multiplex system in optical communication field; Comprise DWDM (Dense Wavelength Division Multiplexing, intensive multiplexed optical wave is used) backbone device system and CWDM (Coarse Wavelength Division Multiplexing, CWDM) metropolitan area network equipment system.
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, dwdm system as shown in Figure 1, traditional will 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.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, 2 huge multiplex/demultiplex veneers; And each optical module is because the difference of wavelength must be selected fixing laser for use, and the application module number is many, thereby system complex; Configurable flexibility ratio is poor, and power consumption is very big, and very flexible; Power system capacity upgrading difficulty is big, and cost is high.
As shown in Figure 2, the internal structure of conventional single ripple passage optical convering unit (OTU) has been used two modules in client side and line side.
The receiving terminal of client side module is converted into the signal of telecommunication with the light signal of client side and sends to the FEC chip and encode, and transmitting terminal passes the decoded signal of telecommunication of coming with the FEC chip and transmits into light signal; The light signal that the receiving terminal of line side module receives main line changes into the signal of telecommunication to FEC, and the signal of telecommunication after the transmitting terminal of line side module is encoded FEC changes into the signal of specifying the DWDM wavelength.
The client side module is used for the access of client side client traffic, and the line side module is responsible for the signal behind the FEC coding is modulated into the light signal of specified wavelength; FEC carries out error correction coding and decoding through the mode that adds expense.
And existing multichannel module also only limits to client side or line side, and must intersect through electricity, like Fig. 3 and Fig. 4, has system complex equally, problems such as the function consumption is big, very flexible.
Summary of the invention
The technical problem that the present invention will solve provides a kind of optical module, to have improved the integrated level of light mouth.
In order to solve the problems of the technologies described above, the invention provides a kind of optical module, be integrated with first module, comprising:
The first partial wave unit is used for the light signal of first wave band that receives is divided into the N wave optical signal, exports to the first photoelectricity conversion unit then;
The first photoelectricity conversion unit is exported to first processing unit after being used for respectively the N wave optical signal that receives being converted into the N road signal of telecommunication;
First processing unit is used for the N road signal of telecommunication that receives is handled, and is converted into the M road signal of telecommunication and exports to the first electric light conversion unit;
The first electric light conversion unit, being used for the M road electrical signal conversion that receives is to export to first behind the light signal of M road second wave band to close the ripple unit;
First closes the ripple unit, exports after being used for M road light signal closed ripple.
Further, above-mentioned optical module also has following characteristics: the first photoelectricity conversion unit comprises: N receiver and N trans-impedance amplifier, wherein,
Said receiver is used for the light signal that receives is converted into photo-signal;
Said trans-impedance amplifier is used for said photo-signal is converted into voltage signal.
Further, above-mentioned optical module also has following characteristics: first processing unit comprises:
The clock and data recovery unit is used for the N road signal of telecommunication is carried out shaping, converts the light signal of M road second wave band into, and wherein, N equals M.
Further, above-mentioned optical module also has following characteristics: first processing unit comprises:
Demultiplexing unit is used for the N road signal of telecommunication and carries out shaping, converts the light signal of M road second wave band into, and wherein, N is not equal to M.
Further, above-mentioned optical module also has following characteristics: the first electric light conversion unit comprises: M laser driver and M laser, wherein,
Said laser driver is exported to corresponding laser after being used for respectively the signal of telecommunication that receives being handled;
Said laser is used for the signal of telecommunication that receives is modulated into the light signal of second wave band.
Further, above-mentioned optical module also has following characteristics:
Said laser is a tunable laser.
Further, above-mentioned optical module also has following characteristics:
First processing unit is exported to the first electric light conversion unit after the M road signal of telecommunication that transforms out exported to veneer and handle again.
Further, above-mentioned optical module also has following characteristics: said optical module also is integrated with second module, comprising:
The second partial wave unit is used for the light signal of second wave band that receives is divided into the M wave optical signal, exports to the second photoelectricity conversion unit then;
The second photoelectricity conversion unit is exported to second processing unit after being used for respectively the M wave optical signal that receives being converted into the M road signal of telecommunication;
Second processing unit is used for the M road signal of telecommunication that receives is handled, and is converted into the N road signal of telecommunication and exports to the second electric light conversion unit;
The second electric light conversion unit, being used for the N road electrical signal conversion that receives is to export to second behind the light signal of N road first wave band to close the ripple unit;
Second closes the ripple unit, exports after being used for N road light signal closed ripple.
Further, above-mentioned optical module also has following characteristics:
First wave band is the 1310nm wave band, and second wave band is the 1550nm wave band; Perhaps
First wave band is the 1550nm wave band, and second wave band is the 1310nm wave band.
In order to address the above problem, the present invention also provides a kind of light wave multiplex system, comprising:
2R above-mentioned optical module, wherein, R is a positive integer.
To sum up, the present invention provides a kind of optical module, has used PIC (Photonic Integrated Circuit, photonic integrated circuits) 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.In addition; The middle PIC of optical module of the present invention is not only simultaneously integrated receiver (PD) and laser (LASER); And simultaneously integrated be used for two kinds of lasers (being respectively 1310 wave bands and 1550 wave bands) in client side and line side, thereby realized that all optical devices that a light is transmitted on veneer or the one group of light forwarding veneer integrate, and have improved integrated level greatly; Reduce cost, reduced the number of veneer.Optical module of the present invention also can be used All-in-One CDR (the Clock and data recovery unit of transmitting-receiving unification simultaneously; The clock and data recovery unit) thus simplified the structure of multichannel optical module greatly; Avoided PCB (Printed Circuit Board; Printed circuit board) signal of telecommunication intersection staggered floor, the another one advantage is to have abandoned electric cross board.So can the minimum optical module of enough numbers, thus minimum cost and configuration the most flexibly cover the purpose that the wave band of whole DWDM has been simplified dwdm system, can be widely used in the backbone network in future.This invention also can be through configuration optical device optical module port number N=8 or N=16 etc. directly as the CWDM system terminal, be applied to Access Network, in the metropolitan area network.
Description of drawings
Fig. 1 is the sketch map of the dwdm system of prior art;
Fig. 2 is the sketch map of the single channel optical convering unit of prior art;
Fig. 3 is existing sketch map based on the integrated DWDM set of wavelengths of the line side PIC of electric interleaving techniques;
Fig. 4 is the existing sketch map of distinguishing the integrated DWDM set of wavelengths of PIC based on the line side and the client side of electric interleaving techniques;
Fig. 5 is the sketch map of the optical module of the embodiment of the invention one;
Fig. 6 is the sketch map of the optical module of the embodiment of the invention two;
Fig. 7 is the sketch map of the optical module of applying examples one of the present invention;
Fig. 8 is the sketch map of the optical module of applying examples two of the present invention;
Fig. 9 is the sketch map of the wavelength-division multiplex system of the embodiment of the invention.
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.
Fig. 5 is the sketch map of the optical module of the embodiment of the invention one, and is as shown in Figure 5, the integrated lower unit of the optical module of present embodiment:
The partial wave unit is used for the light signal of first wave band that receives is divided into the N wave optical signal, exports to the corresponding photoelectricity conversion unit of N speed then respectively;
The photoelectricity conversion unit is exported to processing unit after being used for respectively the light signal that receives being converted into the signal of telecommunication;
Processing unit is used for the N road signal of telecommunication that receives is handled, and is converted into the M road signal of telecommunication and exports to the first electric light conversion unit;
The first electric light conversion unit, being used for the M road electrical signal conversion that receives is to export to behind the light signal of M road second wave band to close the ripple unit;
Close the ripple unit, export after being used for M road light signal closed ripple.
Wherein, the photoelectricity conversion unit can comprise: N receiver and N trans-impedance amplifier, wherein,
Said receiver is used for the light signal that receives is converted into photo-signal;
Said trans-impedance amplifier is used for said photo-signal is converted into voltage signal.
Wherein, processing unit can comprise:
The clock and data recovery unit is used for the N road signal of telecommunication is carried out shaping, converts the light signal of M road second wave band into, and wherein, N equals M.
Wherein, processing unit can comprise:
Demultiplexing unit is used for the N road signal of telecommunication and carries out shaping, converts the light signal of M road second wave band into, and wherein, N is not equal to M.
Wherein, the electric light conversion unit comprises: M laser driver and M laser, wherein,
Said laser driver is exported to corresponding laser after being used for respectively the signal of telecommunication that receives being handled;
Said laser is used for the signal of telecommunication that receives is modulated into the light signal of second wave band.
Wherein, processing unit is exported to the electric light conversion unit after the M road signal of telecommunication that transforms out exported to veneer and handle again.
Fig. 6 is the sketch map of the optical module of inventive embodiments two; As shown in Figure 6; Integrated first module of the optical module of present embodiment and second module, first module is the light signal that is used for the light signal of N ripple first wave band is converted into M ripple second wave band, and second module is the light signal that is used for the light signal of M ripple second wave band is converted into N ripple first wave band; The optical module of embodiment two is the optical module of two-way multi-channel like this, and integrated level is higher.Certainly, the optical module of embodiment two can be made up of two unidirectional multichannel optical modules.
First module in the present embodiment comprises:
The first partial wave unit is used for the light signal of first wave band that receives is divided into the N wave optical signal, exports to the first corresponding photoelectricity conversion unit of N speed then respectively;
The first photoelectricity conversion unit is exported to first processing unit after being used for respectively the light signal that receives being converted into the signal of telecommunication;
First processing unit is used for the N road signal of telecommunication that receives is handled, and is converted into the M road signal of telecommunication and exports to the first electric light conversion unit;
The first electric light conversion unit, being used for the M road electrical signal conversion that receives is to export to first behind the light signal of M road second wave band to close the ripple unit;
First closes the ripple unit, exports after being used for M road light signal closed ripple.
Second module comprises:
The second partial wave unit is used for the light signal of second wave band that receives is divided into the M wave optical signal, exports to the second corresponding photoelectricity conversion unit of M speed then respectively;
The second photoelectricity conversion unit is exported to second processing unit after being used for respectively the light signal that receives being converted into the signal of telecommunication;
Second processing unit is used for the M road signal of telecommunication that receives is handled, and is converted into the N road signal of telecommunication and exports to the second electric light conversion unit;
The second electric light conversion unit, being used for the N road electrical signal conversion that receives is to export to second behind the light signal of N road first wave band to close the ripple unit;
Second closes the ripple unit, exports after being used for N road light signal closed ripple.
Wherein, each unit class in the principle of compositionality of each unit and first module seemingly, just no longer repeat specification here.
For example, N=10, M=4, the optical module of present embodiment the is integrated respectively client's sidelight mouth of 4 * 25G and the circuit sidelight mouth of 10 * 10G can be used for the conversion of 10 ripple 10G light signals and 4 ripple 25G light signals.
For example, N=M=4, two 40GE modules of CFP (multi-source agreement) encapsulation replace 4 OTU unit.
Fig. 7 is the sketch map of the optical module of the present invention's one applying examples; As shown in Figure 7, mainly adopted the PIC technology, PIC is a photonic integrated circuits; Adopt the mode of high integration; With receiver (PD), periodically channel-splitting filter and AWG (Arrayed Waveguide Grating, array waveguide grating), wavelength-selective switches (WSS) and laser, driver, periodically wave multiplexer and AWG), in discrete sets of elements Cheng Zaiyi of refrigerator etc. encapsulate, with Transceiver PIC replacement 2 or a plurality of PIC; Thereby realize the harmless fusion of client side module and line side module, realize the purpose of reducing power consumption, volume, cost.
Being example with client side input 1310nm wave band below describes the operation principle of optical module that should use-case:
Periodically channel-splitting filter is divided into the M wave optical signal to the light signal of the 1310nm wave band of optical fiber input, is coupled to an AWG then;
AWG carries out demultiplexing to the grouping wavelength-division-multiplexed optical signal that it is subordinate to wave band, is divided into M road special speed grade light signal in inside, this M road light signal is exported to the receiver of corresponding speed respectively;
M bank of receivers and TIA (Trans-Impedance Amplifier, trans-impedance amplifier) will receive photoelectric current respectively and be converted into the signal of telecommunication;
Receiver is used for light signal is converted into photo-signal;
TIA is used for photo-signal is converted into the voltage signal with certain amplitude;
Clock and data recovery unit or DEMUX (demultiplexing) chip is converted into the N road signal of telecommunication after the M road signal of telecommunication is carried out shaping, exports to veneer (HOST) through electrical interface; Handle if carry out shaping by the clock and data recovery unit, then M=N handles if carry out shaping by the DEMUX chip, and then M can be not equal to N.
The clock and data recovery unit carries out shaping to the N road signal of telecommunication, makes it go up can pass farther at PCB (printed circuit board), signal of telecommunication relay method commonly used.
The N road signal of telecommunication adds expense through veneer; After carrying out error correction coding; Through the shaping regeneration of clock recovery or the high frequency compensation of MUX (multiplexing) chip and equalizer; After laser driver drives amplification, line side laser (like EA (electro-absorption modulation) laser) is modulated, the N road light signal after the modulation has the specific wavelength of 1550nm wave band again, can guarantee to get into primary transmission.
Accomplish and export by simple optical fiber after the N road light signal that is assigned to after electric light is changed on the specified wavelength passage is recovered usefulness and composite wave through AWG and wave multiplexer.
Be example to describing with line side input 1550nm wave band below with the operation principle of the optical module of example:
Periodically channel-splitting filter is divided into the N wave optical signal to the light signal of the 1550nm wave band of optical fiber input, is coupled to an AWG then;
AWG carries out demultiplexing to the grouping wavelength-division-multiplexed optical signal that it is subordinate to wave band, is divided into N road special speed grade light signal in inside, this N road light signal is exported to the receiver of corresponding speed respectively;
N bank of receivers and TIA will receive photoelectric current respectively and be converted into the signal of telecommunication;
Clock and data recovery unit or DEMUX chip are converted into the M road signal of telecommunication and export to veneer (HOST) through electrical interface after the N road signal of telecommunication is carried out shaping;
The M road signal of telecommunication adds expense through veneer; After carrying out error correction coding; Through the shaping regeneration of clock recovery list or the high frequency compensation of MUX (multiplexing) chip and equalizer; After laser driver drives amplification, the client side laser is modulated, the M road light signal after the modulation has the specific wavelength of 1310nm wave band again.
Completion electric light conversion is assigned at last and is exported by simple optical fiber after M road light signal on the specified wavelength passage is recovered usefulness and composite wave through AWG and wave multiplexer.
When M=N, module is a same rate light forwarding module, can use All-in-One Transceiver CDR, greatly simplifies module structure; When M＜N, module is the rate transition optical module, and inside modules is used the MUX/DEMUX of N/M, and the thick wavelength-division signal of high bandwidth can be used in the M road; When M＞N, module is sub-speed collection module, can accumulate the business of low rate grade the business of two-forty grade, can be applied to the granularity conversion.
Can carry out any light oral sex fork loopback that gating is realized optical module by wavelength through wavelength-selective switches.
Can realize any electric industry affair of optical module loopback through the MUX/DEMUX chip; The signal that receives from receiver side like the signal of telecommunication is directly through sending through transmitter side after the conversion of MUX/DEMUX chip; And do not export to veneer, two passages of OE passage and EO passage become an OEO passage like this.
Fig. 8 is the sketch map of the optical module of Another Application example; The optical module of Fig. 8 is to be used in the occasion of optical channel bandwidth ratio when big; Must pass through DEMUX/MUX in the signal of telecommunication inside of optical module outlet handles; DEMUX demultiplexes into the C1 road low speed signal of telecommunication with M road high-speed electrical signals, and N road high-speed electrical signals is demultiplexed into the C2 road low speed signal of telecommunication.
The type optical module has following advantage:
The OEO of multi-wavelength very cheaply (Optical to Electrical to Optical, the 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.
The embodiment of the invention also provides a kind of wavelength-division multiplex system, and is as shown in Figure 9, can comprise the optical module that 2R the embodiment of the invention provides, and wherein, R is a positive integer.
For example; M=N=8 in optical module; Then can build one 8 ripple WDM (Wavelength Division Multiplexing through the optical module of 2 present embodiments; Wavelength division multiplexing) system, and can be thick wavelength-division interval through changing the line side output wavelength, then can constitute the CWDM system.
Then need reach 160 or 192 line side optical module and 160 or 192 client side 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, in the embodiment of the invention, can only just can realize same capacity with 80/N or 96/N such optical module.
For example, when M=N=10, whole 80 wave systems system only needs the optical module of 16 present embodiments, minimum 16 physics light mouths.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; This optical module meet with when mounted because of unstable or unclean optical fiber connects the failure that causes also still less, the also corresponding reduction of failure rate is more than 87.5%, 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.In addition, because the module light of present embodiment can be realized the light forwarding with same veneer simultaneously according to the value of system needs configuration M and N, sub-speed such as compiles at multiple function, and the kind of veneer also can significantly reduce, the cost of saving veneer.
PIC is integrated in the optical module of present embodiment is that all optical device compatibility is tunable, and 16 optical modules with configuration just can cover whole 80 ripples so for example can adopt, and no matter in technology, production still is that the change of purchase cost is all self-evident.
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. an optical module is integrated with first module, comprising:
The first partial wave unit is used for the light signal of first wave band that receives is divided into the N wave optical signal, exports to the first photoelectricity conversion unit then;
The first photoelectricity conversion unit is exported to first processing unit after being used for respectively the N wave optical signal that receives being converted into the N road signal of telecommunication;
First processing unit is used for the N road signal of telecommunication that receives is handled, and is converted into the M road signal of telecommunication and exports to the first electric light conversion unit;
The first electric light conversion unit, being used for the M road electrical signal conversion that receives is to export to first behind the light signal of M road second wave band to close the ripple unit;
First closes the ripple unit, exports after being used for M road light signal closed ripple.
2. optical module as claimed in claim 1 is characterized in that: the first photoelectricity conversion unit comprises: N receiver and N trans-impedance amplifier, wherein,
Said receiver is used for the light signal that receives is converted into photo-signal;
Said trans-impedance amplifier is used for said photo-signal is converted into voltage signal.
3. optical module as claimed in claim 1 is characterized in that: first processing unit comprises:
The clock and data recovery unit is used for the N road signal of telecommunication is carried out shaping, converts the light signal of M road second wave band into, and wherein, N equals M.
4. optical module as claimed in claim 1 is characterized in that: first processing unit comprises:
Demultiplexing unit is used for the N road signal of telecommunication and carries out shaping, converts the light signal of M road second wave band into, and wherein, N is not equal to M.
5. optical module as claimed in claim 1 is characterized in that: the first electric light conversion unit comprises: M laser driver and M laser, wherein,
Said laser driver is exported to corresponding laser after being used for respectively the signal of telecommunication that receives being handled;
Said laser is used for the signal of telecommunication that receives is modulated into the light signal of second wave band.
6. optical module as claimed in claim 5 is characterized in that:
Said laser is a tunable laser.
7. optical module as claimed in claim 1 is characterized in that:
First processing unit is exported to the first electric light conversion unit after the M road signal of telecommunication that transforms out exported to veneer and handle again.
8. like each described optical module of claim 1-7, it is characterized in that: said optical module also is integrated with second module, comprising:
The second partial wave unit is used for the light signal of second wave band that receives is divided into the M wave optical signal, exports to the second photoelectricity conversion unit then;
The second photoelectricity conversion unit is exported to second processing unit after being used for respectively the M wave optical signal that receives being converted into the M road signal of telecommunication;
Second processing unit is used for the M road signal of telecommunication that receives is handled, and is converted into the N road signal of telecommunication and exports to the second electric light conversion unit;
The second electric light conversion unit, being used for the N road electrical signal conversion that receives is to export to second behind the light signal of N road first wave band to close the ripple unit;
Second closes the ripple unit, exports after being used for N road light signal closed ripple.
9. optical module as claimed in claim 1 is characterized in that:
First wave band is the 1310nm wave band, and second wave band is the 1550nm wave band; Perhaps
First wave band is the 1550nm wave band, and second wave band is the 1310nm wave band.
10. light wave multiplex system comprises:
2R optical module as claimed in claim 8, wherein, R is a positive integer.
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