CN101060378A - A wave division multiple transmission system and method - Google Patents
A wave division multiple transmission system and method Download PDFInfo
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- CN101060378A CN101060378A CN 200610075845 CN200610075845A CN101060378A CN 101060378 A CN101060378 A CN 101060378A CN 200610075845 CN200610075845 CN 200610075845 CN 200610075845 A CN200610075845 A CN 200610075845A CN 101060378 A CN101060378 A CN 101060378A
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Abstract
The disclosed WDM system comprises: a HS signal decomposing unit, a modulation and electric-photo conversion unit, a wave length multiplex unit, a wave length demultiplex unit, a photo-electric conversion and demodulation unit, and a LS signal multiplex unit, wherein it multiplexes multiple signal into on e fiber for transmission; then, decomposes wave length signal relative to HS signal from the fiber to converse into electric signal; and multiplexes these electric signal form LS to HS. This invention realizes the transmission for HS signal in a LS system.
Description
Technical field
The present invention relates to the wave division multiplexing transmission system of optical communication field, relate in particular to a kind of method of utilizing sub rate multiplexing/demultiplexing technology realization transmission of applied in reverse.
Background technology
Wave division multiplexing transmission system (WDM, Wavelength Division Multiplex) is a kind of big Capacity Optical communication bidirectional transmission system that utilizes the wavelength multiplexing technology to realize message transmission.
G.709 defining OTU (Optical Channel Transport Unit in the standard, optical channel transmission unit), ODU (Optical Channel Data Unit, Optical Channel Data Unit-k), OPU (Optical Channel Payload Unit, the optical channel Payload Unit), ODTU data encapsulation structures such as (Optical channelData Tributary Unit, optical channel data tributary units).Each part all has its function and associated overhead.
At the information source end, different rates by the generation of business generation equipment, dissimilar business is modulated onto on the different wavelength after photoelectric conversion unit is handled, after wave multiplexer closes ripple, be multiplexed in the optical fiber and transmit, utilize channel-splitting filter to isolate each wavelength again at stay of two nights end, be converted into by optical conversion element and deliver to service reception equipment behind the signal of telecommunication and handle.As a kind of bidirectional transmission system, receiving element is also arranged at the existing transmitting element of client's side business incoming end.
The network model of wave division multiplexing transmission system is relevant with single pass speed, and its without electronic relay maximum transmission distance, single span section maximum transmission distance all are subjected to the influence of single channel speed.Therefore, for according to given pace design build up the wave transmission system that comes into operation, possibly can't transmit the signal of higher rate.When for example, directly transmission line speed is 40G professional in the transmission system of single channel speed 10G because problems such as chromatic dispersion, signal to noise ratio almost are infeasible.
Along with the develop rapidly of optical communication network, wavelength-division transmission equipment single channel speed progressively carries out the transition to 10Gb/S from 2.5Gb/S, and single channel speed is that the wavelength-division transmission network of 10Gb/S has been the main flow transmission network of present stage, and the beginning large-scale application.On the other hand, client's side needs loaded service speed also in develop rapidly, and the 40G router has begun commercialization, and speed is provided is that the signal demand WDM network of 40G solves transmission problem.
A kind of method that addresses this problem is that to construct single-rate be that the WDM transmission system of 40G is carried the 40G business, but on the one hand because the 40G business also is not a main flow, for solving the new network of non-mainstream professional input substantial contribution structure is not wise move, on the other hand, technically also exist more problem to need to solve: wide, the required electronic device of the signal bandwidth as 40G light modulation/light receiving unit is near the limit of engineering application rate; The circuit dispersion compensation unit then requires compensation precision height, system residual chromatic dispersion tolerance limit little; PMD (Polarization Mode Dispersion, polarization mode dispersion) compensation aspect does not also have practical compensation technique; To practical application, system's luminous power allowance, Optical Signal To Noise Ratio allowance and chromatic dispersion allowance are compared all strict a lot with the 10G system, and reliability is very low.It is slow and difficult that above-mentioned a series of technical barrier can cause the 10G system to shift to the 10G system than 2.5G system toward the transition meeting of 40G system, and transient process can be longer.A large amount of investments and huge technical risk cause this solution feasible hardly.
Therefore, need a kind of method can realize the transmission of high speed signal in idling slow speed system.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of wave division multiplexing transmission system and method, utilize the inverse multiplexing technology, be implemented in the solution of utilizing low speed optical transmission system carrying high speed business signal in the wave transmission system, to solve the problem that the two-forty client signal is difficult for transmission.
For solving the problems of the technologies described above, the invention provides a kind of wave division multiplexing transmission system, comprising:
The high speed signal resolving cell is used for a high-speed electrical signals is decomposed into the sub-rate signal of a plurality of low speed;
Modulation and electrooptic switching element are used for described a plurality of sub-rate signals are carried out the electric light conversion, every road signal of telecommunication all are modulated on the light wave of a coincidence circuit side transmission requirement, obtain corresponding a plurality of light signals;
The wavelength multiplexing unit is used for described a plurality of light signals are carried out wavelength multiplexing, a plurality of wavelength signals is multiplexed in the optical fiber transmits;
The wavelength (de) multiplexing unit is used for decompositing each wavelength signals relevant with high speed signal from optical fiber;
Opto-electronic conversion and demodulating unit, each wavelength signals that is used for described decomposition is come out are converted to corresponding a plurality of signals of telecommunication, realize demodulation;
The low speed signal Multiplexing Unit is used for a plurality of signals of telecommunication after the described demodulation are carried out low speed at a high speed multiplexing, restores described high speed signal.
The present invention and then a kind of wavelength division multiplexing transmission method also is provided comprises the steps:
(1) high-speed electrical signals is decomposed into the sub-rate signal of a plurality of low speed;
(2) described a plurality of sub-rate signals are carried out the electric light conversion, every road signal of telecommunication all is modulated on the light wave of a coincidence circuit side transmission requirement, obtain corresponding a plurality of light signals;
(3) described a plurality of light signals are carried out wavelength multiplexing, a plurality of wavelength signals are multiplexed in the optical fiber transmit;
(4) from optical fiber, decomposite each wavelength signals relevant with high speed signal;
(5) each wavelength signals that described decomposition is come out is converted to corresponding a plurality of signals of telecommunication, realizes demodulation;
(6) a plurality of signals of telecommunication after the described demodulation are carried out low speed at a high speed multiplexing, restore described high speed signal.
The present invention has realized utilizing low speed optical transmission system carrying high speed business signal in wave transmission system, overcome the difficult difficult problem that transmits of two-forty client signal.
Description of drawings
Fig. 1 is the theory diagram according to the described wave division multiplexing transmission system of the embodiment of the invention;
Fig. 2 is the first embodiment principle schematic according to the described high speed signal resolving cell of the embodiment of the invention;
Fig. 3 is the first embodiment principle schematic according to the described low speed signal Multiplexing Unit of the embodiment of the invention;
Fig. 4 is the second embodiment principle schematic according to the described high speed signal resolving cell of the embodiment of the invention;
Fig. 5 is the second embodiment principle schematic according to the described low speed signal Multiplexing Unit of the embodiment of the invention;
Fig. 6 is the first embodiment principle schematic according to described modulation of the embodiment of the invention and electrooptic switching element;
Fig. 7 is the first embodiment principle schematic according to described opto-electronic conversion of the embodiment of the invention and demodulating unit;
Fig. 8 is the wavelength schematic diagram corresponding with Fig. 6, Fig. 7;
Fig. 9 is the second embodiment principle schematic according to described modulation of the embodiment of the invention and electrooptic switching element;
Figure 10 is the second embodiment principle schematic according to described opto-electronic conversion of the embodiment of the invention and demodulating unit;
Figure 11 is the wavelength schematic diagram corresponding with Fig. 9, Figure 10.
Embodiment
The present invention has adopted the sub rate multiplexing technology to carry out adaptive to client's side business speed and line side transmission rate in order to make full use of the transmission that conventional network resources solves the 40G business.When client's side business speed is lower than 10Gb/S, (as client's side business is the SDH signal of 2.5Gb/S, the perhaps GE data service signal of 1Gb/S), the signal that the service signal of 4 2.5Gb/S or 8 GE service signals can be pooled one tunnel speed and be 10Gb/S transmits in the wavelength-division transmission network, and this is the most frequently used a kind of means at present.When client's side business speed is higher than 10Gb/S, (is the signal of 40Gb/S as client's side business), the signal that the service signal of 40Gb/S can be split into 4 road 10Gb/S transmits in the wavelength-division transmission network, and this technology is referred to as the inverse multiplexing technology.
Usually be that the signal that signal with the non-standard rate of a high speed is divided into several low speed standard speeds transmits to the understanding of inverse multiplexing technology, it can be applied in (referring to " Modern Telecommunication science and technology " 2001 No.3 P.28-30) in the various communication systems.
And the inverse multiplexing among the present invention is meant: become the signal of several low speed standards or non-standard rate to transmit the signal decomposition of the standard speed of a high speed, use wavelength division multiplexing or frequency multiplexing technique during transmission.
With reference to figure 1, for according to the described system principle diagram of the embodiment of the invention, comprise following several sections: high speed signal resolving cell 10, modulation and electrooptic switching element 20, wavelength multiplexing unit 30, wavelength (de) multiplexing unit 40, opto-electronic conversion and demodulating unit 50, low speed signal Multiplexing Unit 60.
Wherein, high speed signal resolving cell 10 is used for a high-speed electrical signals is decomposed into the sub-rate signal of a plurality of low speed; Modulation and electrooptic switching element 20 are used for described a plurality of sub-rate signals are carried out the electric light conversion, every road signal of telecommunication all are modulated on the optical wavelength of a coincidence circuit side transmission requirement, obtain corresponding a plurality of light signals; Wavelength multiplexing unit 30 is used for described a plurality of light signals are carried out wavelength multiplexing, a plurality of wavelength signals is multiplexed in the optical fiber transmits; Wavelength (de) multiplexing unit 40 is used for decompositing each wavelength signals relevant with high speed signal from optical fiber; Opto-electronic conversion and demodulating unit 50, each wavelength signals that is used for described decomposition is come out are converted to corresponding a plurality of signals of telecommunication, realize demodulation; Low speed signal Multiplexing Unit 60 is used for a plurality of signals of telecommunication after the described demodulation are carried out low speed at a high speed multiplexing, restores described high speed signal.
The high speed business signal generally transmits on the optical fiber medium, the high speed business conversion of signals that the high speed signal resolving cell provides the light path receiving function to exist with the form of light becomes the signal of telecommunication, can realize of the decomposition of one road high speed signal through special-purpose large scale integrated circuit nest plate afterwards to the multi-path low speed signal, these low speed signals are sent to modulation and electrooptic switching element with the situation of electricity, the purpose of this unit is that one tunnel road the low speed signal of telecommunication is modulated into light signal more again, but the light signal of this moment is different on performance index with the light signal that enters the high speed signal resolving cell, these light signals are modulated onto on the certain wavelengths, and be adapted at transmitting on the optical fiber of long distance, these modulated good light signals are connected to the wavelength multiplexing unit through one group of jumping fiber (short fiber of length about 1m), the core component of wavelength multiplexing unit is an optical device, and it can combine the wavelength optical signals from different fiber and transmit in an optical fiber.Adopt the light mouth to connect between wavelength multiplexing unit and the wavelength (de) multiplexing unit, meet group's trackside interface standard of wdm system, wavelength multiplexing unit and wavelength (de) multiplexing unit are existing unit, and the present invention just uses it to constitute the system of an inverse multiplexing.The wavelength (de) multiplexing unit is the inverse process of wavelength multiplexing unit, be broken down into again on the different optical fiber through each wavelength optical signals behind the wavelength (de) multiplexing unit, and send opto-electronic conversion and demodulating unit to, be that multifiber is connected between wavelength (de) multiplexing unit and opto-electronic conversion and the demodulating unit promptly.Opto-electronic conversion and demodulating unit are the converting unit of a light signal to the signal of telecommunication, through after this cell processing, the original service signal that exists with regard to the form that has become with electricity of the service signal that exists with the form of light, these signals of telecommunication are sent to the low speed signal Multiplexing Unit again and carry out low speed at a high speed multiplexing (realizing with special-purpose large scale integrated circuit nest plate), thereby recover the high speed business signal that transmitting terminal sends at receiving terminal.
The above is that one road high speed business signal is sent to the process of far-end through the designed system of the present invention from near-end, be an one-way process, but actual communication systems all is two-way, need be made of the above-mentioned unit of two covers.
This system realizes that the detailed process of inverse multiplexing transmission is as follows:
Phase I: be that being decomposed into speed was n sub-rate signal S1, the S2...Sn of B2 after the high-speed electrical signals of B1 was handled through high speed signal resolving cell 10 with speed, the available following formula of the relation between B1, B2, the n is described B
1=B
2* n, n=2
k, k ∈ positive integer.
Second stage: signals such as S1, S2...Sn are input to modulation and do the conversion of the signal of telecommunication to light signal with electrooptic switching element 20, every road signal of telecommunication all is modulated onto on the optical wavelength of a coincidence circuit side transmission requirement, thereby obtains the light signal that a series of wavelength are λ 1, λ 2, λ n.
Phase III: a series of wavelength signals enters wavelength multiplexing unit 30 and carries out wavelength multiplexing, and multiplexing result is that the wavelength of a series of carrying information is multiplexed in the optical fiber and transmits.What particularly point out is, wavelength multiplexing unit 30 can realize that not only λ 1, λ 2, λ n etc. and speed are high speed signal relevant wavelength multiplexing of B1, can also be simultaneously multiplexing other with speed be the incoherent wavelength signals of high speed signal of B1.Wavelength (de) multiplexing unit 40 is inverse process of wavelength multiplexing unit 30.Wavelength multiplexing unit 30 and wavelength (de) multiplexing unit 40 are existing unit, and the present invention directly quotes it.
The quadravalence section: what 40 decomposition were come out from the wavelength (de) multiplexing unit realizes that through opto-electronic conversion and demodulating unit 50 backs demodulation or light to the conversion of electricity, obtain series of electrical signals S1 ', S2 ', Sn ' with professional each the relevant wavelength signals of transmitting terminal high speed signal.
Five-stage: S1 ', S2 ', Sn ' realize low speed at a high speed multiplexing through low speed signal Multiplexing Unit 60, thereby restore the high speed signal that speed is B1.
Above-mentioned whole process has just realized the transmission of high speed signal in an idling slow speed system.
As shown in Figure 2, the first embodiment schematic diagram for the described high speed signal resolving cell 10 of the embodiment of the invention, this high speed signal resolving cell 100 comprise OTU3 unit 101, ODU3 unit 102, OPU3 to ODTU23 map unit 103, ODTU23 to ODU2 map unit 104a, 104b, 104c, 104d, and OTU2 unit 105a, 105b, 105c, 105d.
Wherein, OTU3 unit 101 is used for the high-speed electrical signals of input is carried out decoding FEC; ODU3 unit 102 is used for described decoded data, removes the Optical Channel Data Unit-k expense; OPU3 is used for interleaving by byte to ODTU23 map unit 103, and the signal decomposition after will handling through described Optical Channel Data Unit-k is the data-signal that multichannel meets optical channel data tributary unit; ODTU23 is mapped as the signal that meets Optical Channel Data Unit-k to the data-signal that ODU2 map unit 104a, 104b, 104c, 104d are used for respectively described multichannel being met optical channel data tributary unit, obtains the corresponding sub-rate signal of multi-path low speed; OTU2 unit 105a, 105b, 105c, 105d are used for respectively the sub-rate signal of described multi-path low speed being carried out exporting behind the forward error correction coding.
According to embodiment shown in Figure 2, the signal decomposition that to have described a speed that meets OTN form (a kind of data format of stipulating in the optical transfer network standard) be OTU3 becomes the process of 4 road STM-64 signals.
In this embodiment, the 40G signal of input is handled through OTU3, ODU3 successively, remove the OTU3 expense, carry out FEC (forward error correction) decoding, obtain the OPU3 frame after removing the ODU3 expense, can from OPU3, take out CBR (Constant Bit Rate afterwards, constant bit rate) 40G signal, this signal meets the STM-256 form,, adopt byte to interleave technology and realize being broken down into again 4 road STM-64 signals, this four road STM-64 signal is carried out the FEC coding, obtain 10G signal, transmit through changing light signal into behind the photoelectric conversion unit with the FEC function.The signal that the speed that meets OTU3 is approximately 43Gbit/s is a client side signal, and the signal of 10Gbit/s is a line-side signal, is adapted at transmitting in the wave transmission system that single-rate is 10Gbit/s.
As shown in Figure 3, be the first embodiment schematic diagram according to the described low speed signal Multiplexing Unit 60 of the embodiment of the invention, this low speed signal Multiplexing Unit 600, comprise: OUT2 unit 601a, 601b, 601c, 601d, ODU2 is to map unit 602a, 602b, 602c, the 602d of ODTU23, and ODTU23 is to map unit 603, ODU3 unit 604, the OTU3 unit 605 of OPU3.
Wherein, OUT2 unit 601a, 601b, 601c, 601d are used for respectively the sub-rate signal of multi-path low speed being carried out decoding FEC; ODU2 is used for interleaving by byte to map unit 602a, 602b, 602c, the 602d of ODTU23, and the signal of described multichannel behind decoding FEC merged into one road signal, forms the signal that meets optical channel data tributary unit; ODTU23 is used for described optical channel data tributary unit signal map to the optical channel Payload Unit to the map unit 603 of OPU3; ODU3 unit 604 is used for increasing the Optical Channel Data Unit-k expense with to the described signal that is mapped to the optical channel Payload Unit; OTU3 unit 605 is used for the signal through described Optical Channel Data Unit-k processing is carried out exporting behind the forward error correction coding, obtains original high-speed electrical signals.
Fig. 3 has described the inverse process that above-mentioned high speed signal decomposes.After the processing of signal through one group of 10Gbit/s after the fibre circuit transmission through opto-electronic conversion and demodulating unit, change the signal of telecommunication that speed is 10Gbit/s into, the signal of telecommunication of four tunnel 10Gbit/ss relevant with original high speed signal is at first handled through OTU2, carry out fec decoder, utilize byte to interleave technology afterwards 4 road 10Gbit/s are merged into one road signal, formation meets the Frame of CBR40G, be mapped to the OPU3 layer again, increase the expense of ODU3 afterwards, increase the expense of OTU3, carry out the FEC coding at last, finally recovering the speed that meets the OTU3 form is the client side signal of 43Gbit/s.
As shown in Figure 4, the second embodiment principle schematic for high speed signal resolving cell 10 of the present invention, this high speed signal resolving cell 110 comprises interface adaptation unit 111, GFP (GenericFraming Procedure, generic framing procedure, GFP) unit 112, speed adjustment unit 113, DMUX (Trans-Demultiplexer, sub-speed demodulation multiplexer) unit 114, PMA/PCS (physical medium connects and coding) unit 115a～115h.
Wherein, interface adaptation unit 111 is used for the high speed signal of input is realized the decoding of line coding, and takes out payload user data; General frame forming unit 112 is used for the payload user data of described taking-up is packaged into interchangeable frame; Speed adjustment unit 113 is used for by increasing or delete the bandwidth utilization rate of the balanced every road of idle frame signal; Sub-speed demultiplexing unit 114 is used for adopting byte to interleave technology described interchangeable frame and is decomposed into 8 tunnel payload data signal; Physical medium connects and coding unit 115a～115h is used for 8 tunnel payload data signal after decomposing through the laggard line of encapsulation road coding, to obtain the corresponding with it sub-rate signal of low speed.
With reference to shown in Figure 4, the ethernet signal that meets the IEEE802.3 standard that to have described a speed be 10Gbit/s is broken down into the process that 8 tunnel speed are the ethernet signal of 1Gbit/s.Speed is the client side signal of 10Gbit/s realizes line coding through the interface adaptation unit decoding, take out payload user data, then it is packaged into GFP (Generic Framing Procedure, the interchangeable frame agreement) frame, afterwards it is adopted byte to interleave technology and resolve into the signal that 8 tunnel speed are 1Gbit/s, because the restriction of bandwidth, need before decomposing, increase a speed adjustment unit, by increasing or delete the bandwidth utilization rate of the balanced every road of idle frame 1Gbit/s signal, payload data after being decomposed is through the coding of the laggard line of package road again, acquisition meets the 1Gbit/s signal of IEEE802.3 standard, transmits through changing light signal into behind the photoelectric conversion unit then.
As shown in Figure 5, the second embodiment principle schematic for low speed signal Multiplexing Unit 60 of the present invention, this low speed signal Multiplexing Unit 610 comprises: PMA/PCS (physical medium connects and decoding) unit 611a～611h, MUX (Trans-Multiplexer, sub-rate multiplexer) unit 612, speed adjustment unit 613, GFP (Generic Framing Procedure, generic framing procedure, GFP) unit 614, interface adaptation unit 615.
Wherein, physical medium connects and decoding unit 611a～611h, is used for the sub-rate signal process of 8 road low speed of input line decoding is obtained 8 tunnel corresponding with it payload data signal; Sub rate multiplexing unit 612 is used to utilize byte to interleave technology 8 tunnel payload data signal is merged into one tunnel payload data signal; Speed adjustment unit 613 is used to solve the balance of each road signal payload data; General frame forming unit 614 is used for described payload data is packaged into interchangeable frame; Interface adaptation unit 615 is used for described interchangeable frame is encapsulated and coding through corresponding, recovers and the output high speed signal.
With reference to shown in Figure 5, the inverse process that high speed signal decomposes has been described.After the processing of signal through one group of 1Gbit/s after the circuit optical fiber transmission through opto-electronic conversion and demodulating unit, change the signal of telecommunication that speed is 1Gbit/s into, 8 the tunnel with the 1Gbit/s signal of original 10Gbit/s signal correction at first through obtaining 8 road payload datas behind the line decoding, adopt byte to interleave technology again described 8 road payload datas are merged into one road payload data, and the through-rate adjustment unit solves the balance of the payload data of each road GE, then it is packaged into the gfp frame form, make its frame format meet the IEEE802.3 standard through corresponding encapsulation with coding again, thereby recover the 10Gbit/s signal that is transmitted of client's side.
As shown in Figure 6, be the first embodiment principle schematic of modulation of the present invention and electrooptic switching element 20, this modulation and electrooptic switching element 200 comprise a plurality of pumping source 201a～201n, a plurality of electrooptic switching element 202a～202n.
Wherein, a plurality of pumping source 201a～201n are used to produce light source; A plurality of electrooptic switching element 202a～202n, the a plurality of signals of telecommunication that are used for needs are changed are as modulation signal, a plurality of light sources to described generation are modulated, obtain carrying the light modulated identical, thereby be light signal after a series of modulation with specific wavelength with electrical signal conversion with electrical signal information.
Fig. 6 has showed the transfer process of electro-optical signal, need electrical signal converted S1, S2...Sn as modulation signal, produce light source by a series of pumping sources, with these signals of telecommunication light source is modulated, can obtain carrying the light modulated identical with electrical signal information, thereby signal of telecommunication S1, S2...Sn are converted to the light λ 1 with specific wavelength, λ 2... λ n after a series of modulation, and G.694.1 these wavelength meet, the regulation of standard G.694.2, and each wavelength takies the passage of an ITU-T.
As shown in Figure 7, the first embodiment principle schematic for opto-electronic conversion of the present invention and demodulating unit 50, this opto-electronic conversion and demodulating unit 500 comprise a plurality of light-detecting device 501a～501n, are used for a series of modulated optical signals with specific wavelength are converted to the signal of telecommunication.
Fig. 7 has showed that a kind of light signal is converted to the process of the signal of telecommunication, utilize light-detecting device the modulated optical signal of specific wavelength can be converted to the signal of telecommunication, through obtaining one group of signal of telecommunication S1 ', S2 ' after the processing such as amplification, shaping ... Sn ', there be not under the situation of error code S1 ', S2 ' ... the information that Sn ' and S1, S2...Sn carry is identical.
The wavelength schematic diagram corresponding with Fig. 6, Fig. 7, as shown in Figure 8.
As shown in Figure 9, be the second embodiment principle schematic of modulation of the present invention and electrooptic switching element 20, this modulation and electrooptic switching element 210 comprise a plurality of pumping source 211a～211n, a plurality of frequency division multiplexing and electrooptic switching element 212a～212n.
Wherein, a plurality of pumping source 211a～211n are used to produce light source, and light source frequency is f0, and corresponding wavelength takies a passage; A plurality of frequency division multiplexings and electrooptic switching element 212a～212n are used in a Wavelength grid, and utilizing sub-carrier modulation to obtain one group is the carrier wave of benchmark with f0, and with the signal of telecommunication these carrier waves is modulated, and obtain one group of wavelength signals after the modulation.
Among second embodiment shown in Figure 9, adopting sub-carrier modulation is the main distinction with first embodiment, the light source frequency that pumping source sends among the figure is f0, corresponding wavelength takies a passage of ITU-T standard code, in the Wavelength grid of an ITU-T regulation, utilizing the sub-carrier modulation principle can obtain one group is the carrier wave of benchmark with f0, with signal S1, S2...Si these carrier waves is modulated and just can be obtained one group of wavelength signals after the modulation
The expression wavelength standard is one group of wavelength of λ.Adopt sub-carrier modulation, can improve the utilance of fiber bandwidth greatly.
As shown in figure 10, the second embodiment principle schematic for opto-electronic conversion of the present invention and demodulating unit 50, this opto-electronic conversion and demodulating unit 510 comprise a plurality of optical branching filter 511a～511n, be used for further to isolate each wavelength through the wavelength of respectively organizing that described wavelength (de) multiplexing unit is separated respectively, after opto-electronic conversion, obtain the corresponding signal of telecommunication.
Corresponding with Fig. 9, separate through the set of wavelengths that will be positioned at different I TU-T grid behind the wavelength (de) multiplexing unit 40, wavelength (de) multiplexing unit 40 is similar to the group channel-splitting filter at this moment, isolated every group of wavelength further isolated each wavelength through behind the channel-splitting filter, can obtain the corresponding signal of telecommunication through after the opto-electronic conversion then.
The wavelength schematic diagram corresponding with Fig. 9, Figure 10, as shown in figure 11.
Claims (20)
1. a wave division multiplexing transmission system is characterized in that, comprising:
The high speed signal resolving cell is used for a high-speed electrical signals is decomposed into the sub-rate signal of a plurality of low speed;
Modulation and electrooptic switching element are used for described a plurality of sub-rate signals are carried out the electric light conversion, every road signal of telecommunication all are modulated on the light wave of a coincidence circuit side transmission requirement, obtain corresponding a plurality of light signals;
The wavelength multiplexing unit is used for described a plurality of light signals are carried out wavelength multiplexing, a plurality of wavelength signals is multiplexed in the optical fiber transmits;
The wavelength (de) multiplexing unit is used for decompositing each wavelength signals relevant with high speed signal from optical fiber;
Opto-electronic conversion and demodulating unit, each wavelength signals that is used for described decomposition is come out are converted to corresponding a plurality of signals of telecommunication, realize demodulation;
The low speed signal Multiplexing Unit is used for a plurality of signals of telecommunication after the described demodulation are carried out low speed at a high speed multiplexing, restores described high speed signal.
2. the system as claimed in claim 1 is characterized in that, described high speed signal resolving cell, and the speed of the high-speed electrical signals of input is B1, and the sub-rate signal speed that decomposites is B2, and quantity is n, wherein, B
1=B
2* n, n=2
k, k ∈ positive integer.
3. the system as claimed in claim 1 is characterized in that, described high speed signal resolving cell comprises:
Optical channel transmission unit is used for the high-speed electrical signals of input is carried out decoding FEC;
Optical Channel Data Unit-k is used for described decoded data, removes the Optical Channel Data Unit-k expense;
The optical channel Payload Unit is used for interleaving by byte to the map unit of optical channel data tributary unit, and the signal decomposition after will handling through described Optical Channel Data Unit-k is the data-signal that multichannel meets optical channel data tributary unit;
A plurality of optical channel data tributary units are to the map unit of Optical Channel Data Unit-k, the data-signal that is used for respectively described multichannel being met optical channel data tributary unit is mapped as the signal that meets Optical Channel Data Unit-k, obtains the corresponding sub-rate signal of multi-path low speed;
A plurality of optical channel transmission units are used for respectively the sub-rate signal of described multi-path low speed being carried out exporting behind the forward error correction coding.
4. the system as claimed in claim 1 is characterized in that, described low speed signal Multiplexing Unit comprises:
A plurality of optical channel transmission units are used for respectively the sub-rate signal of multi-path low speed being carried out decoding FEC;
A plurality of Optical Channel Data Unit-k are used for interleaving by byte to the map unit of optical channel data tributary unit, and the signal of described multichannel behind decoding FEC merged into one road signal, form the signal that meets optical channel data tributary unit;
Optical channel data tributary unit is used for described optical channel data tributary unit signal map to the optical channel Payload Unit to the map unit of optical channel Payload Unit;
Optical Channel Data Unit-k is used for increasing the Optical Channel Data Unit-k expense with to the described signal that is mapped to the optical channel Payload Unit;
Optical channel transmission unit is used for the signal through described Optical Channel Data Unit-k processing is carried out exporting behind the forward error correction coding, obtains original high-speed electrical signals.
5. the system as claimed in claim 1 is characterized in that, described high speed signal resolving cell comprises:
The interface adaptation unit is used for the high speed signal of input is realized the decoding of line coding, and takes out payload user data;
The general frame forming unit is used for the payload user data of described taking-up is packaged into interchangeable frame;
The speed adjustment unit is used for by increasing or delete the bandwidth utilization rate of the balanced every road of idle frame signal;
Sub-speed demultiplexing unit is used for adopting byte to interleave technology described interchangeable frame and is decomposed into the multichannel payload data signal;
A plurality of physical mediums connect and coding unit, and the multichannel payload data signal that is used for obtaining after decomposing obtains the corresponding with it sub-rate signal of multi-path low speed through the laggard line of encapsulation road coding.
6. the system as claimed in claim 1 is characterized in that, described low speed signal Multiplexing Unit comprises:
A plurality of physical mediums connect and decoding unit, are used for the sub-rate signal process of the multi-path low speed of input line decoding is obtained corresponding with it multichannel payload data signal.
The sub rate multiplexing unit is used to utilize byte to interleave technology the multichannel payload data signal is merged into one tunnel payload data signal;
The speed adjustment unit is used to solve the balance of each road signal payload data;
The general frame forming unit is used for described payload data is packaged into interchangeable frame;
The interface adaptation unit is used for described interchangeable frame is encapsulated and coding through corresponding, recovers and the output high speed signal.
7. the system as claimed in claim 1 is characterized in that, described modulation and electrooptic switching element comprise:
A plurality of pumping sources are used to produce light source;
A plurality of electrooptic switching elements, the a plurality of signals of telecommunication that are used for needs are changed are as modulation signal, a plurality of light sources to described generation are modulated, and obtain carrying the light modulated identical with electrical signal information, thereby are the light signal with specific wavelength after a series of modulation with electrical signal conversion.
8. the system as claimed in claim 1 is characterized in that, described opto-electronic conversion and demodulating unit comprise:
A plurality of light-detecting devices are used for a series of modulated optical signals with specific wavelength are converted to the signal of telecommunication.
9. the system as claimed in claim 1 is characterized in that, described modulation and electrooptic switching element comprise:
A plurality of pumping sources are used to produce light source, and light source frequency is f0, and corresponding wavelength takies a passage;
A plurality of frequency division multiplexings and electrooptic switching element are used in a Wavelength grid, and utilizing sub-carrier modulation to obtain one group is the carrier wave of benchmark with f0, and with the signal of telecommunication these carrier waves is modulated, and obtain one group of wavelength signals after the modulation.
10. the system as claimed in claim 1 is characterized in that, described opto-electronic conversion and demodulating unit comprise:
A plurality of optical branching filters are used for will further isolating each wavelength through the wavelength of respectively organizing that described wavelength (de) multiplexing unit is separated respectively, obtain the corresponding signal of telecommunication after opto-electronic conversion.
11. a wavelength division multiplexing transmission method is characterized in that, comprises the steps:
(1) high-speed electrical signals is decomposed into the sub-rate signal of a plurality of low speed;
(2) described a plurality of sub-rate signals are carried out the electric light conversion, every road signal of telecommunication all is modulated on the light wave of a coincidence circuit side transmission requirement, obtain corresponding a plurality of light signals;
(3) described a plurality of light signals are carried out wavelength multiplexing, a plurality of wavelength signals are multiplexed in the optical fiber transmit;
(4) from optical fiber, decomposite each wavelength signals relevant with high speed signal;
(5) each wavelength signals that described decomposition is come out is converted to corresponding a plurality of signals of telecommunication, realizes demodulation;
(6) a plurality of signals of telecommunication after the described demodulation are carried out low speed at a high speed multiplexing, restore described high speed signal.
12. as method as described in the claim 11, it is characterized in that in the described step (1), the speed of high-speed electrical signals is B1, the sub-rate signal speed that decomposites is B2, quantity is n, wherein, and B
1=B
2* n, n=2
k, k ∈ positive integer.
13. method as claimed in claim 11 is characterized in that, described step (1) comprising:
(11A) high-speed electrical signals of input is carried out decoding FEC;
(12A) to described decoded data, remove the Optical Channel Data Unit-k expense;
(13A) interleaving by byte, is the data-signal that multichannel meets optical channel data tributary unit with the signal decomposition after the removal Optical Channel Data Unit-k expense;
(14A) data-signal that respectively described multichannel is met optical channel data tributary unit is mapped as the signal that meets Optical Channel Data Unit-k, obtains the corresponding sub-rate signal of multi-path low speed;
(15A) respectively the sub-rate signal of described multi-path low speed is carried out exporting behind the forward error correction coding.
14. method as claimed in claim 11 is characterized in that, described step (6) comprising:
(61A) respectively the sub-rate signal of multi-path low speed is carried out decoding FEC;
(62A) interleave, the signal of described multichannel behind decoding FEC merged into one road signal, form the signal that meets optical channel data tributary unit by byte;
(63A) described optical channel data tributary unit signal map is arrived the optical channel Payload Unit;
(64A) will increase the Optical Channel Data Unit-k expense to the described signal that is mapped to the optical channel Payload Unit;
(65A) will carry out exporting behind the forward error correction coding, obtain original high-speed electrical signals through the signal of described Optical Channel Data Unit-k processing.
15. method as claimed in claim 11 is characterized in that, described step (1) comprising:
(11B) high speed signal of input is realized the decoding of line coding, and taken out payload user data;
(12B) payload user data with described taking-up is packaged into interchangeable frame;
(13B) by increasing or delete the bandwidth utilization rate of the balanced every road of idle frame signal;
(14B) adopt byte to interleave technology described interchangeable frame and be decomposed into the multichannel payload data signal;
(15B) the multichannel payload data signal that obtains after will decomposing is through the laggard line of encapsulation road coding, to obtain the corresponding with it sub-rate signal of multi-path low speed.
16. method as claimed in claim 11 is characterized in that, described step (6) comprising:
(61B), obtain corresponding with it multichannel payload data signal with the sub-rate signal process of the multi-path low speed of input line decoding;
(62B) utilize byte to interleave the multichannel payload data signal is merged into one tunnel payload data signal;
(63B) payload data of each road signal of balance;
(64B) described payload data is packaged into interchangeable frame;
(65B) described interchangeable frame is encapsulated and coding through corresponding, recover and the output high speed signal.
17. method as claimed in claim 11 is characterized in that, described step (2) comprising:
(21A) utilize a plurality of pumping sources to be used to produce a series of light sources;
(22A) will need a plurality of signals of telecommunication of changing, a plurality of light sources of described generation will be modulated, obtain carrying the light modulated identical, thereby be light signal after a series of modulation with specific wavelength with electrical signal conversion with electrical signal information as modulation signal.
18. method as claimed in claim 11 is characterized in that, described step (5) comprising:
Utilize a plurality of light-detecting devices that a series of modulated optical signals with specific wavelength are converted to the signal of telecommunication.
19. method as claimed in claim 11 is characterized in that, described step (2) comprising:
(21B) utilize a plurality of pumping sources to produce a series of light sources, light source frequency is f0, and corresponding wavelength takies a passage;
(22B) utilize a plurality of frequency division multiplexings and electrooptic switching element in a Wavelength grid, utilizing sub-carrier modulation to obtain one group is the carrier wave of benchmark with f0, and with the signal of telecommunication these carrier waves is modulated, and obtains one group of wavelength signals after the modulation.
20. method as claimed in claim 11 is characterized in that, described step (5) comprising:
Utilize a plurality of optical branching filters will further isolate each wavelength through the wavelength of respectively organizing that described wavelength (de) multiplexing unit is separated respectively, after opto-electronic conversion, obtain the corresponding signal of telecommunication.
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| CN 200610075845 CN101060378A (en) | 2006-04-20 | 2006-04-20 | A wave division multiple transmission system and method |
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| CN 200610075845 CN101060378A (en) | 2006-04-20 | 2006-04-20 | A wave division multiple transmission system and method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101835068A (en) * | 2009-03-12 | 2010-09-15 | 富士通株式会社 | Frame transfer device and frame transfer method |
| WO2016202296A1 (en) * | 2015-06-19 | 2016-12-22 | 华为技术有限公司 | Data bearing method and apparatus, and data parsing method and apparatus |
| CN103780514B (en) * | 2014-02-11 | 2017-01-11 | 中国联合网络通信集团有限公司 | Method and device for selecting bandwidth |
| WO2017067001A1 (en) * | 2015-10-23 | 2017-04-27 | 华为技术有限公司 | Data transmission method, and optical transmission device |
| CN108521430A (en) * | 2018-04-24 | 2018-09-11 | 天津芯海创科技有限公司 | Double protocol multiplexing chips and double protocol multiplexing methods |
| CN109743114A (en) * | 2019-01-11 | 2019-05-10 | 太原理工大学 | A kind of two-way multichannel chaotic laser light communication system and communication means |
| CN111903079A (en) * | 2018-01-11 | 2020-11-06 | 拉什米尔科技有限公司 | Reconfigurable point-to-multipoint connection |
| CN114745055A (en) * | 2022-03-29 | 2022-07-12 | 中国电子科技集团公司第三十八研究所 | Superconducting quantum system based on optical carrier microwave signal transmission |
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- 2006-04-20 CN CN 200610075845 patent/CN101060378A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101835068A (en) * | 2009-03-12 | 2010-09-15 | 富士通株式会社 | Frame transfer device and frame transfer method |
| CN101835068B (en) * | 2009-03-12 | 2013-04-24 | 富士通株式会社 | Frame transfer device and frame transfer method |
| CN103780514B (en) * | 2014-02-11 | 2017-01-11 | 中国联合网络通信集团有限公司 | Method and device for selecting bandwidth |
| WO2016202296A1 (en) * | 2015-06-19 | 2016-12-22 | 华为技术有限公司 | Data bearing method and apparatus, and data parsing method and apparatus |
| WO2017067001A1 (en) * | 2015-10-23 | 2017-04-27 | 华为技术有限公司 | Data transmission method, and optical transmission device |
| CN107925503A (en) * | 2015-10-23 | 2018-04-17 | 华为技术有限公司 | A kind of data transmission method and optical transmission device |
| CN107925503B (en) * | 2015-10-23 | 2019-07-23 | 华为技术有限公司 | A kind of data transmission method and optical transmission device |
| CN111903079A (en) * | 2018-01-11 | 2020-11-06 | 拉什米尔科技有限公司 | Reconfigurable point-to-multipoint connection |
| CN108521430A (en) * | 2018-04-24 | 2018-09-11 | 天津芯海创科技有限公司 | Double protocol multiplexing chips and double protocol multiplexing methods |
| CN109743114A (en) * | 2019-01-11 | 2019-05-10 | 太原理工大学 | A kind of two-way multichannel chaotic laser light communication system and communication means |
| CN114745055A (en) * | 2022-03-29 | 2022-07-12 | 中国电子科技集团公司第三十八研究所 | Superconducting quantum system based on optical carrier microwave signal transmission |
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