CN103222214A - Method and apparatus of wavelength division multiplexing optical network transmission - Google Patents
Method and apparatus of wavelength division multiplexing optical network transmission Download PDFInfo
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Abstract
The embodiment of the invention provides a method and apparatus of wavelength division multiplexing optical network transmission. In the optical network for hybrid transmission with different rates, a channel with N wavelengths is divided into M channels, and each of the M channels includes at least one channel, and at least N-1 channels, wherein, N and M are positive integers which are greater than 1 and M<=N; each channel of the M channels is carried out by time-delay according to different time-delay amounts, and M channels with different time-delays are obtained; M channels with different time-delays are combined for output. Compared with the method, the apparatus comprises a wave separator, a delayer set and a combiner. The technical scheme solves the problem that the low transmission performance caused by non-linear interference in the optical network for hybrid transmission with different rates, and the network performance is improved.
Description
Technical field
The present invention relates to field of optical networks, and more specifically, relate to the method and apparatus of wavelength division multiplexed optical network transmission.
Background technology
(wavelength division multiplexing, WDM) technology can support the light wave of a plurality of different wave lengths to transmit simultaneously according to the data designated transmission rate to wavelength division multiplexing.In present wdm system, extensively adopting relevant DSP(digital Signal Processing, Digital Signal Processing) technology carries out the construction of the optical transmission system of 40G bps and 100G bps (following 40G and the 100G of abbreviating as respectively) speed.The relevant DSP technology of 40G, 100G generally adopts palarization multiplexing (polarization division multiplexing, abbreviation PDM) binary phase shift keying (Binary phase shift keying, be called for short BPSK) or quadrature four phase place phase shift keyings (Quadrature phase shift keying, be called for short QPSK) etc. the transmitting terminal modulation technique, and reception techniques such as coherent reception and DSP processing, be one of state-of-the-art technology in present commercialization 40G, the 100G WDM transmission system.For convenience of description, hereinafter, the 40G that adopts relevant DSP technology or the channel of 100G speed rates are abbreviated as 40G channel or 100G channel respectively.
In the network application of current 40G, 100G transmission technology; often need be deployed with low speed (as 2.5G bps, 10G bps; below abbreviate 2.5G and 10G similarly respectively as) be upgraded to 40G, 100G transmission on the optical fiber link existing network of channel; and keep original low transmission rate channel simultaneously; with the smooth upgrade of realizing network, higher spectrum utilization ratio is provided, reduces every bit and transmit cost, reach the protection investment, save the purpose of networking and O﹠M cost.The essential distinction of interchannel is the wavelength difference.The speed of different channels can be identical, also can be different.
Mixing the optical-fiber network that passes with 10G channel and 100G channel is example.Mixing in the biography process with the 100G channel, apparent in view non-linear XPM(Cross-phase modulation cross-phase modulation can take place with the former in the 10G channel) interact, the 100G channel is produced interference, and can cause the obvious deterioration of transmission performance of 100G channel.
The root of the transmission performance damage of the 100G channel that this nonlinear effect causes is lower because of the speed that is the 10G channel, and spectral bandwidth is narrower, and spectral concentration is higher.And being spectral bandwidth with interference channel, the power of nonlinear effect is inversely proportional to.Luminous power is constant, and the spectrum of stray light is narrow more down, and nonlinear interaction is strong more.
In the optical-fiber network that mixes biography with other speed equally above problem can appear.Therefore, need a kind of method or device, can solve in fiber optic network, the channel of different rates mixes the low excessively problem of network transmission performance when passing.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of method and apparatus of wavelength division multiplexed optical network transmission, to solve the low excessively problem of transmission performance.
First aspect, the method of a kind of wavelength division multiplexing (WDM) optical-fiber network transmission is provided, comprise: in the optical-fiber network of different rates mixed transport, the channel of N wavelength is divided into the M paths, each road in the M paths comprises at least one channel, comprise N-1 channel at most, wherein N and M are respectively positive integer and the M≤N greater than 1; The time-delay of different delayed time amount is carried out on each road in the M paths, obtained the passage of M road different delayed time; Export after the passage of M road different delayed time closed ripple.
In first kind of possible implementation, the channel that the channel medium wavelength of N wavelength is approaching is assigned in the different roads, forms the M paths after the grouping altogether.
In second kind of possible implementation, the channel medium wavelength of N wavelength is the approaching and channel use different rates is assigned in the different roads, forms the M paths after the grouping altogether.
In conjunction with the above-mentioned possible implementation of first aspect or first aspect, in the third possible implementation, the time-delay of different delayed time amount is carried out on each road in the M paths, the scope that amount of delay differs is greater than 100 psecs.
In conjunction with the above-mentioned possible implementation of first aspect or first aspect, in the 4th kind of possible implementation, in the optical-fiber network of different rates mixed transport, be provided with the protection bandwidth between the different rates channel transmitted.
Above-mentioned possible implementation in conjunction with first aspect or first aspect, in the 5th kind of possible implementation, comprise the channel of following two or more speed rates in the optical-fiber network of different rates mixed transport: 2.5G bps, 10G bps, 40G bps, 100G bps and 1T bps.
Second aspect, the device that provides a kind of wavelength division multiplexing (WDM) optical-fiber network to transmit comprises channel-splitting filter, delayer group, wave multiplexer:
Channel-splitting filter is used for the optical-fiber network in the different rates mixed transport, and the channel of N wavelength is divided into the M paths, output to the delayer group, each road in the M paths comprises at least one channel, comprises N-1 channel at most, and wherein N and M are respectively positive integer and the M≤N greater than 1; The delayer group is used for the time-delay of different delayed time amount is carried out on each road of the M paths of channel-splitting filter output, obtains the passage of M road different delayed time, outputs to wave multiplexer; Wave multiplexer is used for exporting after passage with the M road different delayed time of delayer group output closes ripple.
In first kind of possible implementation, channel-splitting filter specifically is used for the channel that the channel medium wavelength of N wavelength is approaching and assigns to the passage of not going the same way, and forms the M paths after the grouping altogether.
In second kind of possible implementation, channel-splitting filter specifically is used for the channel of the channel medium wavelength of N wavelength is approaching and use different transmission rates and assigns to the passage of not going the same way, and forms the M paths after the grouping altogether.
In conjunction with the above-mentioned possible implementation of second aspect or second aspect, in the third possible implementation, the delayer group specifically is used for each road of M paths is carried out the time-delay of different delayed time amount, and the scope that amount of delay differs is greater than 100 psecs.
Above-mentioned possible implementation in conjunction with second aspect or second aspect, in the 4th kind of possible implementation, device is applied in the optical-fiber network that uses the different rates mixed transport, comprises the channel of following two or more speed rates in the optical-fiber network: 2.5G bps, 10G bps, 40G bps, 100G bps and 1T bps.
Pass through technique scheme, different rates can be mixed the channel that passes and carry out partial wave, delay time and close the ripple processing, by improving the amount of delay of the interchannel of different rates in the transmission course, thereby reduced the non-linear interference of the interchannel of different rates, the channel of raising different rates mixes the network transmission performance when passing.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schematic diagram of optical-fiber network in the prior art.
Fig. 2 is the schematic flow diagram of method of the wavelength division multiplexed optical network transmission of the embodiment of the invention.
Fig. 3 is the schematic diagram of the optical-fiber network of the embodiment of the invention.
Fig. 4 is the schematic block diagram of a kind of multichannel difference delayer of the embodiment of the invention.
Fig. 5 is the schematic block diagram of the operation principle of multichannel difference delayer.
Fig. 6 is the schematic diagram of the simulation result of the embodiment of the invention.
Fig. 7 A and Fig. 7 B are respectively the schematic block diagrams of the another kind of multichannel difference delayer of the channel-splitting filter of prior art and the embodiment of the invention.
Fig. 7 C and Fig. 7 D are respectively the schematic block diagrams of the another kind of multichannel difference delayer of the wave multiplexer of prior art and the embodiment of the invention.
Fig. 8 is the schematic block diagram of device of the wavelength division multiplexed optical network transmission of the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Term " system " and " network " often are used interchangeably in this article herein.Herein term " and/or ", only be a kind of incidence relation of describing affiliated partner, can there be three kinds of relations in expression, for example, A and/or B, can represent: individualism A exists A and B, these three kinds of situations of individualism B simultaneously.In addition, character "/" herein, generally represent forward-backward correlation to as if a kind of " or " relation.
Fig. 1 is the schematic diagram of optical-fiber network 10 in the prior art.Optical-fiber network 10 can comprise OTM(Optical Terminal Multiplexer usually, optical multiplexer 11, image intensifer 12, OLA(Optical line amplification in the station of optical terminal multiplexer) standing, optical link amplifies) stand 13, Transmission Fibers 14, OADM(Optical add-drop multiplexing, Optical Add Drop Multiplexer) stand 15 and the OTM receipts station of standing in equipment such as optical branching filter 16.Wherein, OLA station 13 is used to carry out power back-off and dispersion compensation, can be one or more power back-off and the dispersion compensations of carrying out among several OLA in the practical application, and other OLA stations only are used to carry out power back-off; OADM station 15 is used to carry out the ripple up and down of channel.Generally include the equipment or the device of multiple smooth partial wave, photosynthetic ripple in the network of use OADM, AWG(arrayed waveguide grating for example, array waveguide grating), ITL(interleaver, optical comb filter), WSS(Wavelength Selective Switch, wavelength-selective switches) etc.Wherein AWG and ITL are commonly used to constitute that " fixed OADM equipment (Fix OADM is called for short FOADM), WSS are commonly used to constitute " restructural formula OADM equipment (reconfigurable OADM is called for short ROADM).Schematically two equipment in the OADM station 15 have been represented among Fig. 1 with 15A and 15B.
The root of the transmission performance of the 100G channel that nonlinear effect causes damage be because of also comprising following reason, makes that transmission performance is poorer in the network.
Optionally, low-rate channel for example 10G channel generally adopts OOK(On-off keying, the on-off keying) modulation.10G OOK is a kind of optical modulation formats of single polarization, by nonlinear effects such as XPM, can produce disturbance fast to the SOP (state of polarization, polarization state) of 100G channel, causes the latter's SOP to follow the tracks of losing lock when serious, causes error code.
In addition, when the actual transmissions distance is longer, adopted distributed dispersion compensation measure on the 10G existing network, the terminal residual dispersion amount of each section of striding generally is in the small range.Distributed dispersion compensation measure makes that walking from (walk-off) of 10G channel and 100G interchannel is not obvious.Walk from more little, the stack of the nonlinear effect of each section of striding is just serious more.
When the channel of different rates in optical-fiber network 10 mixes when passing, because the non-linear interference of interchannel causes in the network transmission performance low, the embodiment of the invention provides a kind of technical scheme, can improve transmission performance.
Fig. 2 is the schematic flow diagram of method 20 of the wavelength division multiplexed optical network transmission of the embodiment of the invention, comprises following content.
S21 in the optical-fiber network of different rates mixed transport, is divided into the M paths with the channel of N wavelength, and each road in the described M paths comprises at least one channel, comprises N-1 channel at most, and wherein N and M are respectively positive integer and the M≤N greater than 1.
Existing transmission rate comprises 2.5G channel, 10G channel, 40G channel, 100G channel etc., along with the development of technology, also higher transmission rate can occur.In the WDM optical-fiber network, mixed transport comprises the channel of two or more speed, and the channel of every kind of speed comprises one or more wavelength that are used to transmit at least.With the channel packet of all wavelengths, form the M paths.
S22 carries out the time-delay of different delayed time amount to each road in the M paths, obtains the passage of M road different delayed time.
Because the time delay of the interchannel that different rates mix to pass is less to be the bigger one of the main reasons of non-linear interference that causes interchannel,, make that the time-delay on each road is different with the time-delay on other roads in the M road therefore by delay process.
S23 exports after the passage of M road different delayed time closed ripple.
The channel of not going the same way closed export after ripple forms one the tunnel, in optical-fiber network, transmit continuing.
The embodiment of the invention is carried out partial wave, delays time and closes the ripple processing by different rates being mixed the channel that passes, by improving the amount of delay of the interchannel of different rates in the transmission course, thereby reduced the non-linear interference of the interchannel of different rates, the channel of raising different rates mixes the network transmission performance when passing.
Optionally, as different embodiment, the channel that the channel medium wavelength of N wavelength is approaching is assigned in the different roads, forms the M paths after the grouping altogether.
Optionally, as different embodiment, the channel medium wavelength of N wavelength is the approaching and channel use different transmission rates is assigned in the passage of not going the same way, and forms the M paths after the grouping altogether.
Optionally, as different embodiment, the time-delay of different delayed time amount is carried out on each road in the described M road, (picosecond is called for short ps to described amount of delay scope greater than 100 psecs; 1 psec=10
-12Second, i.e. trillionth second).
Optionally, as different embodiment, in the optical-fiber network of different rates mixed transport, be provided with the protection bandwidth between the different rates channel transmitted.
Optionally, as different embodiment, comprise the channel of following at least two kinds of speed rates in the optical-fiber network of different rates mixed transport: 2.5G bps, 10G bps, 40G bps, 100G bps and 1T bps.
Fig. 3 is the schematic diagram of the optical-fiber network 30 of the embodiment of the invention.Similar with the optical-fiber network 10 of Fig. 1, optical-fiber network 30 can comprise equipment such as optical multiplexer 11, image intensifer 12, OLA station 13, Transmission Fibers 14, OADM station 15 and optical branching filter 16 equally.Optical multiplexer 11 and optical branching filter 16 are included in sending out the station and receiving the station of OTM station respectively.Different with the optical-fiber network 10 of Fig. 1 is that optical-fiber network 30 also comprises one or more multichannel difference delayers 31.Multichannel difference delayer 31 can be carried out the method 20 of the embodiment of the invention, is placed on arbitrary place of the link except that receiving the station in the Transmission Fibers link.Optionally, convenience for actual management, multichannel difference delayer 31 can place OLA station 13, perhaps can place the inside at OADM station 15, perhaps can place OTM to send out the inside at station, for example 10G and 100G channel produce different amount of delay to the channel of different channel especially different transmission rates.
Fig. 4 is the schematic block diagram of a kind of multichannel difference delayer of the embodiment of the invention.Optionally, as a kind of implementation, multichannel difference delayer 31 comprises channel-splitting filter 31A, delayer group 31B and wave multiplexer 31C.
Next, the operation principle of analyzing multichannel difference delayer 31 by Fig. 5 illustrates the technical scheme of the embodiment of the invention.Fig. 5 is the schematic block diagram of the operation principle of multichannel difference delayer 31.
S51, channel-splitting filter 31A partial wave.
Channel-splitting filter 31A receives the WDM light of the channel of N the wavelength that uses different transmission rates.Channel-splitting filter 31A will contain for example M paths and the output of WDM light demultiplexing of N channel.For convenience of description, above-mentioned " multichannel output " is called " multichannel output ", each road output channel comprises 1 path channels at least, comprises the N-1 path channels at most.Wherein M and N are the positive integer greater than 1, and M≤N.The shunt mode that N channel is divided into the M paths can be fixed, and also can be provided with, and depends on the number of N channel, and the situation of ripple up and down of present networks node.N channel is divided into the group forming criterion of M paths for to make the approaching a plurality of channels of wavelength be assigned on the different passages as far as possible, make these channels after passing through the delayer group of channel-splitting filter 31A back, time delays amount each other has nothing in common with each other, to reduce the XPM nonlinear interaction of these interchannels.
For instance, when the present invention is used for OLA website 13, can the WDM channel of this website of break-through evenly be divided into groups.For example, suppose that the WDM channel has 80, i.e. N=80 can be provided with channel-splitting filter 31A and make 80 ripple channels are divided into 8 the tunnel, 8 passages just, i.e. and M=8, then each passage comprises 10 channels.The first via comprises the 1st channel (abbreviating ch1 as), ch9, ch17 ... ch73.The second the tunnel is ch2, ch10, ch18 ... ch74.Other channels by that analogy, and are as shown in table 1.Adopt this group technology, can be so that the approaching a plurality of channels of wavelength such as ch1～ch8, be assigned in the different passages.Normally according to the wavelength numbering, its medium wavelength is little than short sequence number for the numbering of channel; Perhaps according to the frequency numbering, its medium wavelength is little than long sequence number.The wavelength of the channel of adjacent numbering is approaching, be easy to generate XPM and disturb, and when the channel of adjacent numbering used different transmission rates, XPM disturbed even more serious.Preferably, with adjacent numbering and use the channel of different transmission rates to divide in different passages, after this optical-fiber network transmission performance is improved better.
Table 1
S52, delayer group 31B time-delay.
Delayer group 31B produces different time-delays to the channel in each road output channel of channel-splitting filter 31A.Delayer group 31B can be an independent devices, also can be the combination of a plurality of devices; Delayer group 31B produces different time-delays to every paths, and the amount of delay between every road differs scope, is designated hereinafter simply as the difference amount of delay, and the difference amount of delay is more than 100 psecs.For example, delayer group 31B is 0ps to the time delay of first via signal, is 400ps to the time delays amount of the second road signal, is 600ps to the time delays amount of Third Road signal, and the rest may be inferred.
S53, wave multiplexer 31C closes ripple.
Wave multiplexer 31C closes ripple with multiplexer channel and becomes one tunnel output.
Multichannel difference delayer 31 can be the optical device of specialized designs, processing, to the different amount of delay of channel generation of different wave length.Multichannel difference delayer 31 can be placed in the Transmission Fibers link except that receiving end Anywhere, for example places OLA station 13, the perhaps inside at OADM station 15, and perhaps OTM sends out the inside at station, perhaps in the Transmission Fibers.Qualification is not done in the position of multichannel difference delayer 31 and the position of image intensifer 12, can be placed in the middle of two image intensifers, can be placed on the output or the input of image intensifer yet.
After the best applications mode of this multichannel difference delayer 31 is one section optical fiber of every transmission, place a multichannel difference delayer 31, also can a plurality of sections of striding of every transmission place a multichannel difference delayer 31.
Fig. 6 is the schematic diagram of the simulation result of the embodiment of the invention.
10G on the optical fiber link of dispersion compensation is arranged and 100G channel mix in the biography process, the time delay of 10G and 100G interchannel is less to be the one of the main reasons that causes the 10G channel bigger to the non-linear interference of 100G channel, therefore, the present invention reduces the transmission cost (transmission penalty) of 10G to the 100G channel by the amount of delay of 10G and 100G interchannel in the raising transmission course.Transmission cost is meant that channel is after Optical Fiber Transmission, at receiving terminal is the BER(Bit Error Rate that reaches certain, bit error rate), needed OSNR(Optical signal to noise ratio, Optical Signal To Noise Ratio) and the difference of the OSNR when not transmitting between requiring.Transmission cost is more little, shows that systematic function is good more.
Fig. 6 has provided the embodiment of the invention under the condition that different interchannel delay inequalities is set, to the simulation result of the influence of the transmission cost of 100G channel.Simulated conditions comprises: adopted 4 10G NRZ(non-return to zero; Non-return-to-zero)-OOK channel and 1 100G RZ(return to zero; Make zero)-PDM(polarization division multiplexing; Palarization multiplexing)-QPSK(quadrature phase shift keying; Binary phase shift keying) channel is at 8 sections, and every section is that G.652 80km mixes biography in the optical fiber.The DCM(dispersion compensation module of every section rearmounted 100% dispersion compensation of Transmission Fibers, dispersion compensation module).Place a multichannel difference delayer 31 after per 4 sections Transmission Fibers.Multichannel difference delayer 31 with above-mentioned 5 wavelength divided be 5 the tunnel, and each path channels is produced different time-delays, closing ripple again is the output of one road signal.10G and 100G channel are 1dBm at the incident optical power of each section Transmission Fibers.As can be seen from Figure 6, along with the increase of the set interchannel delay inequality of multichannel difference delayer 31, the relevant transmission cost of 100G reduces gradually.When not having multichannel difference delayer 31, the transmission cost of 100G PDM-QPSK will reach 3dB.Along with the increase of the difference amount of delay of difference delayer 31, the transmission cost of 100G PDM-QPSK channel will reduce, and therefore the transmission performance of 100G channel improves.As from the foregoing, when the best difference amount of delay of multichannel difference delayer 31 was set to 200ps, the transmission cost of 100G channel was reduced to 0.7dB, and after this transmission cost changes steadily.Therefore, the embodiment of the invention can preferably be defined as the difference amount of delay more than the 100ps.Above-mentioned theory emulation shows that the embodiment of the invention can reduce the nonlinear degradation effect of 10G channel to the 100G channel effectively, improves network transmission performance.
For succinctly, serve as main being described with 100G channel and relevant DSP technology thereof in the embodiment of the invention.These are described 40G channel and relevant DSP technology thereof, and greater than the channel of 100G, for example 400G, 1T etc., and technical solution of the present invention also is suitable for.
Above-mentioned learning has multiple smooth partial wave, closes wave device and device in the OADM network, comprise AWG, ITL, WSS etc.The embodiment of the invention can increase the difference delay process in the inside light path of devices such as common AWG, ITL or WSS, realize the technical scheme of the embodiment of the invention.
Fig. 7 A and Fig. 7 B are respectively the schematic block diagrams of the another kind of multichannel difference delayer of the channel-splitting filter of prior art and the embodiment of the invention.Optionally, behind existing channel-splitting filter 71 output ports of devices such as AWG, ITL or WSS, increase delayer group 72, thereby form the multichannel difference delayer 73 of the embodiment of the invention.Similarly, can after OTM sends out the output port of channel-splitting filter at station, increase the delayer group, thereby form the multichannel difference delayer 73 of the embodiment of the invention.Carry out the grouping of channel at adjacent channel and with the channel-splitting filter of different rates transmission, compared with carrying out the grouping of channel, better effects if by existing channel-splitting filter.
Fig. 7 C and Fig. 7 D are respectively the schematic block diagrams of the another kind of multichannel difference delayer of the wave multiplexer of prior art and the embodiment of the invention.Optionally, before existing wave multiplexer 74 input ports of devices such as AWG, ITL or WSS, increase delayer group 72, thereby form the multichannel difference delayer group 75 of the embodiment of the invention.
In the OADM station, optionally, can use multichannel difference delayer 73 and multichannel difference delayer 75 simultaneously; Perhaps, can use multichannel difference delayer 73 and wave multiplexer 74 simultaneously; Perhaps, can use channel-splitting filter 71 and multichannel difference delayer 74 simultaneously.In the light path of each port of these existing smooth partial waves, photosynthetic wave device inside, by increasing the difference delay process, make WDM light when the OADM station of forming via FOADM and ROADM equipment, each approaching channel of wavelength is produced different big or small amount of delay, and the difference amount of delay of different channels is defined as more than the 100ps.Finally, with the signal output of closing behind the ripple.The signal of output has reduced the non-linear interference of the interchannel of different rates, thereby has improved the transmission performance of network owing to delay process.
In the prior art, can also be provided with by the interchannel at different transmission rates and reserve the non-linear interference that enough protection bandwidth (guard band) reduce interchannel, the representative value of protection bandwidth is 200～500GHz.The number of protection bandwidth is relevant with the concrete compound mode of different channels.Do not need extra protection bandwidth such as 40G and the mixed biography of 100G interchannel; 10G and 40G channel, or 10G and the mixed bandwidth that needs protection that passes of 100G interchannel; And 2.5G and 40G channel, or 2.5G and the mixed just bigger protection bandwidth of needs that passes of 100G interchannel.Owing in the protection bandwidth, can not place transmission channel, so the shortcoming of this method is to reduce the channel number and the total capacity of whole transmission system.Though; preferably; can use technical scheme in the embodiment of the invention to reduce the non-linear interference of interchannel separately; but; as a kind of execution mode, can use in the transmission network of protecting the bandwidth technology, existing in conjunction with the technical scheme in the embodiment of the invention; in two kinds of different modes, solve the non-linear interference of interchannel jointly.
Fig. 8 is the schematic block diagram of device 80 of the wavelength division multiplexed optical network transmission of the embodiment of the invention.
Device 80 comprises channel-splitting filter 81, delayer group 82 and wave multiplexer 83.
Channel-splitting filter 81 is in the optical-fiber network of different rates mixed transport, the channel of N wavelength is divided into the M paths, outputs to described delayer group 82, each road in the described M paths comprises at least one channel, comprise N-1 channel at most, wherein N and M are respectively positive integer and the M≤N greater than 1.
The time-delay of different delayed time amount is carried out on each road in the described M paths of 82 pairs of described channel-splitting filter 81 outputs of delayer group, obtains the passage of M road different delayed time, outputs to described wave multiplexer.
Wave multiplexer 83 is exported after the passage of the described M road different delayed time of described delayer group 82 outputs is closed ripple.
The device of the embodiment of the invention carries out partial wave, delays time and closes the ripple processing by different rates being mixed the channel that passes, by improving the amount of delay of the interchannel of different rates in the transmission course, thereby reduced the non-linear interference of the interchannel of different rates, the channel of raising different rates mixes the network transmission performance when passing.
Optionally, as different embodiment, channel-splitting filter 81 channel that the channel medium wavelength of N wavelength is approaching is assigned in the passage of not going the same way, form altogether after the grouping M paths,
Optionally, as different embodiment, channel-splitting filter 81 with the channel medium wavelength of N wavelength near and use the channel of different transmission rates to assign in the passage of not going the same way, form the M paths after the grouping altogether.
Optionally, as different embodiment, delayer group 82 specifically is used for each road of described M paths is carried out the time-delay of different delayed time amount, and the scope that described amount of delay differs is greater than 100 psecs.
Optionally, as different embodiment, device 80 is applied in the optical-fiber network that uses the different rates mixed transport, comprises the channel of following at least two kinds of speed rates in the described optical-fiber network: 2.5G bps, 10G bps, 40G bps, 100G bps and 1T bps.Along with development of science and technology, can also comprise more speed.
Device 80 can be Fig. 3, Fig. 4 or multichannel difference delayer 31 shown in Figure 5, also can be the multichannel difference delayer that utilizes the part of existing equipment to form, for example 73 of Fig. 7 B and Fig. 7 D 75 shown in.Device 80 has been realized method 20, can improve the transmission performance of the WDM optical-fiber network of mixing rate transmission.
Those of ordinary skills can recognize, the unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions still are that software mode is carried out with hardware actually, depend on the application-specific and the design constraint of technical scheme.The professional and technical personnel can use distinct methods to realize described function to each specific should being used for, but this realization should not thought and exceeds scope of the present invention.
The those skilled in the art can be well understood to, and is the convenience described and succinct, and the concrete course of work of the system of foregoing description, device and unit can not repeat them here with reference to the corresponding process among the preceding method embodiment.
In several embodiment that the application provided, should be understood that disclosed system, apparatus and method can realize by other mode.For example, device embodiment described above only is schematic, for example, the division of described unit, only be that a kind of logic function is divided, during actual the realization other dividing mode can be arranged, for example a plurality of unit or assembly can in conjunction with or can be integrated into another system, or some features can ignore, or do not carry out.Another point, the shown or coupling each other discussed or directly to be coupled or to communicate to connect can be by some interfaces, the indirect coupling of device or unit or communicate to connect can be electrically, machinery or other form.
Described unit as separating component explanation can or can not be physically to separate also, and the parts that show as the unit can be or can not be physical locations also, promptly can be positioned at a place, perhaps also can be distributed on a plurality of network element.Can select wherein some or all of unit to realize the purpose of present embodiment scheme according to the actual needs.
In addition, each functional unit in each embodiment of the present invention can be integrated in the processing unit, also can be that the independent physics in each unit exists, and also can be integrated in the unit two or more unit.
If described function realizes with the form of SFU software functional unit and during as independently production marketing or use, can be stored in the computer read/write memory medium.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words or the part of this technical scheme can embody with the form of software product, this computer software product is stored in the storage medium, comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out all or part of step of the described method of each embodiment of the present invention.And aforesaid storage medium comprises: various media that can be program code stored such as USB flash disk, portable hard drive, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by described protection range with claim.
Claims (9)
1. the method for a wave division multiplexing WDM optical-fiber network transmission is characterized in that, comprising:
In the optical-fiber network of different rates mixed transport, the channel of N wavelength is divided into the M paths, each road in the described M paths comprises at least one channel, comprises N-1 channel at most, and wherein N and M are respectively positive integer and the M≤N greater than 1;
The time-delay of different delayed time amount is carried out on each road in the described M paths, obtained the passage of M road different delayed time;
Export after the passage of described M road different delayed time closed ripple.
2. method according to claim 1 is characterized in that, described channel with N wavelength is divided into the M paths, comprising:
The channel that the channel medium wavelength of N wavelength is approaching is assigned in the different roads, forms the M paths after the grouping altogether.
3. method according to claim 1 is characterized in that, described channel with N wavelength is divided into the M paths, comprising:
The channel medium wavelength of N wavelength is the approaching and channel use different rates is assigned in the different roads, forms the M paths after the grouping altogether.
4. according to each described method of claim 1 to 3, it is characterized in that, described the time-delay of different delayed time amount carried out on each road in the described M paths, comprising:
The time-delay of different delayed time amount is carried out on each road in the described M paths, and the scope that described amount of delay differs is greater than 100 psecs.
5. according to each described method of claim 1 to 4, it is characterized in that, in the optical-fiber network of different rates mixed transport, be provided with the protection bandwidth between the different rates channel transmitted.
6. the device of a wave division multiplexing WDM optical-fiber network transmission is characterized in that, comprises channel-splitting filter, delayer group, wave multiplexer:
Described channel-splitting filter, be used for optical-fiber network in the different rates mixed transport, the channel of N wavelength is divided into the M paths, output to described delayer group, each road in the described M paths comprises at least one channel, comprise N-1 channel at most, wherein N and M are respectively positive integer and the M≤N greater than 1;
Described delayer group is used for the time-delay of different delayed time amount is carried out on each road of the described M paths of described channel-splitting filter output, obtains the passage of M road different delayed time, outputs to described wave multiplexer;
Described wave multiplexer is used for exporting after passage with the described M road different delayed time of described delayer group output closes ripple.
7. device according to claim 6 is characterized in that:
Described channel-splitting filter specifically is used for the channel that the channel medium wavelength of N wavelength is approaching and assigns to the passage of not going the same way, and forms the M paths after the grouping altogether.
8. device according to claim 6 is characterized in that:
Described channel-splitting filter specifically is used for the channel of the channel medium wavelength of N wavelength is approaching and use different transmission rates and assigns to the passage of not going the same way, and forms the M paths after the grouping altogether.
9. according to each described device of claim 6 to 8, it is characterized in that:
Described delayer group specifically is used for each road of described M paths is carried out the time-delay of different delayed time amount, and described amount of delay is greater than 100 psecs.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2012/084455 WO2014071631A1 (en) | 2012-11-12 | 2012-11-12 | Wavelength division multiplexing optical network transmission method and apparatus |
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| CN103222214A true CN103222214A (en) | 2013-07-24 |
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| CN201280001951.XA Pending CN103222214A (en) | 2012-11-12 | 2012-11-12 | Method and apparatus of wavelength division multiplexing optical network transmission |
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| WO (1) | WO2014071631A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015042875A1 (en) * | 2013-09-27 | 2015-04-02 | 华为技术有限公司 | Wavelength selective switch and method for controlling spatial phase modulator in wavelength selective switch |
| CN111596409A (en) * | 2019-02-20 | 2020-08-28 | 阿里巴巴集团控股有限公司 | Optical transmission system, scheduling node, multiplexing node, and demultiplexing node |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1294726C (en) * | 2004-05-13 | 2007-01-10 | 上海交通大学 | Node structure supporting variable-length packet in metropolitan area ring network |
| CN100576946C (en) * | 2006-06-22 | 2009-12-30 | 天津大学 | The novel full light serial-parallel conversion method that is used for the high-speed light packet switching |
| JP5270741B2 (en) * | 2011-11-04 | 2013-08-21 | 日本電信電話株式会社 | Optical transmission equipment |
| CN102749782A (en) * | 2012-07-03 | 2012-10-24 | 上海交通大学 | Adjustable time delay system of frequency domain linear phase shift |
-
2012
- 2012-11-12 CN CN201280001951.XA patent/CN103222214A/en active Pending
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015042875A1 (en) * | 2013-09-27 | 2015-04-02 | 华为技术有限公司 | Wavelength selective switch and method for controlling spatial phase modulator in wavelength selective switch |
| US9660723B2 (en) | 2013-09-27 | 2017-05-23 | Huawei Technologies Co., Ltd. | Wavelength selective switch and method for controlling spatial phase modulator in wavelengths |
| CN111596409A (en) * | 2019-02-20 | 2020-08-28 | 阿里巴巴集团控股有限公司 | Optical transmission system, scheduling node, multiplexing node, and demultiplexing node |
| CN111596409B (en) * | 2019-02-20 | 2022-08-30 | 阿里巴巴集团控股有限公司 | Optical transmission system, scheduling node, multiplexing node, and demultiplexing node |
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| WO2014071631A1 (en) | 2014-05-15 |
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