CN102315894B - Channel allocation method, channel decorrelation method and DWDM (dense wavelength division multiplexing) transmission experimental system - Google Patents
Channel allocation method, channel decorrelation method and DWDM (dense wavelength division multiplexing) transmission experimental system Download PDFInfo
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Abstract
The invention discloses a channel allocation method, a channel decorrelation method and a DWDM (dense wavelength division multiplexing) transmission experimental system which are used for allocating wavelength channels of transmitters to delay lines in the DWDM transmission experimental system. The channel allocation method comprises a first allocation step and a second allocation step, wherein the first allocation step comprises: respectively selecting M wavelength channels which are nearest to wavelength channels to be measured from the wavelength channels contained in each transmitter, and allocating the selected M wavelength channels of each transmitter to the M delay lines in a one-to-one correspondence mode; and the second allocation step comprises: averagely allocating the rest of wavelength channels to the M delay lines as far as possible, and ensuring that the any two wavelength channels of which the wavelength difference is N delta lambda from the same transmitter are not allocated to the same delay line.
Description
Technical field
The present invention relates to the communications field, especially relate to the channel decorrelation method and apparatus in dense wave division multipurpose Transmission System, and dense wave division multipurpose Transmission System.
Background technology
In dense wave division multipurpose (DWDM) system, the phase noise that Cross-phase Modulation (Cross-PhaseModulation, XPM) causes is the one of the main reasons that affects systematic function.In order to estimate the impact of Cross-phase Modulation, conventional method is under lab to carry out multi-channel transmission experiment.Traditional experimental technique is odd even decorrelation method, and this has been widely used in various multi-channel transmission experiments.The method makes all odd-numbered channels through same optical sender, and all even-numbered channels, through another optical sender, finally close ripple by all channels, forms a dense wave division multipurpose experiment emission system.But traditional odd even decorrelation method can not correctly be estimated the impact of Cross-phase Modulation in actual light communication system.
Summary of the invention
An object of the present invention is, be provided for the channel decorrelation method and apparatus of multi-channel transmission experiment, can effectively in dense wave division multipurpose experimental system, realize channel decorrelation by the method and device.Provide hereinafter about brief overview of the present invention, to the basic comprehension about some aspect of the present invention is provided.Should be appreciated that this general introduction is not about exhaustive general introduction of the present invention.It is not that intention is determined key of the present invention or pith, and nor is it intended to limit the scope of the present invention.Its object is only that the form of simplifying provides some concept, using this as the preorder in greater detail of discussing after a while.
According to one embodiment of present invention, provide a kind of for the wavelength channel of transmitter being assigned to the method on delay line at dense wave division multipurpose Transmission System, wherein said system comprises N transmitter, N × M coupler and M bar delay line, each transmitter comprises that at least the channel number of M wavelength channel and different transmitters differs at most one, wavelength difference between adjacent wavelength-channels is Δ λ, wherein N, M is natural number, described method comprises: the first allocation step: difference chosen distance M nearest wavelength channel of wavelength channel to be measured the wavelength channel comprising from each transmitter, and the M of a selected each transmitter wavelength channel is distributed to M bar delay line correspondingly, and second allocation step: by all the other wavelength channels as far as possible number be assigned to fifty-fifty on M bar delay line, and the wavelength channel that to make from any two wavelength difference of same transmitter be N Δ λ is not assigned to identical delay line.
By the method, can process the channel of any more number, especially, can in lower equipment complexity situation, carry out multi channel transmission experiment.
In addition, according to one embodiment of present invention, also provide a kind of for determine the method for delay line length at dense wave division multipurpose Transmission System, comprise: obtain minimum delay time, determine minimum delay length according to minimum delay time, and determine the corresponding length of delay line based on minimum delay length, make the length of delay line in the situation that arranging from small to large, form not arithmetic sequence.
Owing to having utilized in the method not arithmetic sequence, thus the periodicity of having avoided sequence to increase, and the periodicity of having avoided the difference of adjacent two of sequence to have, can simulate real system better.
In addition, according to one embodiment of present invention, also provide a kind of at dense wave division multipurpose Transmission System by the method for channel decorrelation, comprise: dense wave division multipurpose Transmission System is provided, wherein said system comprises N transmitter, N × M coupler and M bar delay line, each transmitter comprises that at least the channel number of M wavelength channel and different transmitters differs at most one, wavelength difference between adjacent wavelength-channels is Δ λ, wherein N, M are natural number, and the wavelength channel of transmitter is assigned on M bar delay line, the length of wherein said M bar delay line is come to determine by the following method: obtain minimum delay time, determine minimum delay length according to minimum delay time, determine respectively the corresponding length of M bar delay line based on minimum delay length, make the length of delay line in the situation that arranging from small to large, form not arithmetic sequence, the step wherein wavelength channel of transmitter being assigned on M bar delay line comprises: the first allocation step: difference chosen distance M nearest wavelength channel of wavelength channel to be measured the wavelength channel comprising from each transmitter, and the M of a selected each transmitter wavelength channel is distributed to M bar delay line correspondingly, and second allocation step: by all the other wavelength channels as far as possible number be assigned to fifty-fifty on M bar delay line, and the wavelength channel that to make from any two wavelength difference of same transmitter be N Δ λ is not assigned to identical delay line.
The advantage that the method has is that one side can be processed the channel of any more number, can simulate better on the other hand real system.
In addition, according to one embodiment of present invention, also provide a kind of for the wavelength channel of transmitter being assigned to the wavelength selection unit on delay line at dense wave division multipurpose Transmission System, wherein said system also comprises N transmitter, N × M coupler and M bar delay line, each transmitter comprises that at least the channel number of M wavelength channel and different transmitters differs at most one, wavelength difference between adjacent wavelength-channels is Δ λ, wherein N, M is natural number, described wavelength selection unit comprises: the first distributor, it is arranged to difference chosen distance M nearest wavelength channel of wavelength channel to be measured the wavelength channel comprising from each transmitter, and the M of a selected each transmitter wavelength channel is distributed to M bar delay line correspondingly, and second distributor, its be arranged to by all the other wavelength channels as far as possible number be assigned to fifty-fifty on M bar delay line, and the wavelength channel that to make from any two wavelength difference of same transmitter be N Δ λ is not assigned to identical delay line.
In addition, according to one embodiment of present invention, a kind of dense wave division multipurpose Transmission System is also provided, comprise N transmitter, N × M coupler, M bar delay line and wavelength selection unit, each transmitter comprises that at least the channel number of M wavelength channel and different transmitters differs at most one, wavelength difference between adjacent wavelength-channels is Δ λ, wherein N, M is natural number, the length of wherein said M bar delay line is come to determine by the following method: obtain minimum delay time, determine minimum delay length according to minimum delay time, determine respectively the corresponding length of M bar delay line based on minimum delay length, make the length of delay line in the situation that arranging from small to large, form not arithmetic sequence, wherein wavelength selection unit comprises: the first distributor, it is arranged to difference chosen distance M nearest wavelength channel of wavelength channel to be measured the wavelength channel comprising from each transmitter, and the M of a selected each transmitter wavelength channel is distributed to M bar delay line correspondingly, and second distributor, its be arranged to by all the other wavelength channels as far as possible number be assigned to fifty-fifty on M bar delay line, and the wavelength channel that to make from any two wavelength difference of same transmitter be N Δ λ is not assigned to identical delay line.
Above-mentioned wavelength selection unit and dense wave division multipurpose Transmission System have advantages of identical with corresponding method.
In addition, embodiments of the invention also provide the computer program for realizing described method.
In addition, embodiments of the invention also provide at least computer program of computer-readable medium form, record the computer program code for realizing said method on it.
Brief description of the drawings
The present invention can be by reference to hereinafter given description and being better understood by reference to the accompanying drawings.Described accompanying drawing comprises in this manual and forms the part of this specification together with detailed description below, and is used for further illustrating the preferred embodiments of the present invention and explains principle and advantage of the present invention.In the accompanying drawings:
Fig. 1 shows the schematic diagram of dense wave division multipurpose Transmission System according to an embodiment of the invention;
Fig. 2 shows according to an embodiment of the invention for the wavelength channel of transmitter being assigned to the flow chart of the method on delay line;
Fig. 3 shows the flow chart of the method for definite delay line length according to an embodiment of the invention;
Fig. 4 shows according to an embodiment of the invention by the flow chart of the method for channel decorrelation;
Fig. 5 shows the schematic diagram of wavelength selection unit according to an embodiment of the invention;
Fig. 6 shows according to the effect of channel decorrelation apparatus and method of the present invention; And
Fig. 7 shows and can be used for implementing the schematic block diagram of computer according to an embodiment of the invention.
Embodiment
In connection with accompanying drawing, example embodiment of the present invention is described hereinafter.All features of actual execution mode are not described for clarity and conciseness, in specification.But, should understand, in the process of any this practical embodiments of exploitation, must make much decisions specific to execution mode, to realize developer's objectives, and these decisions may change to some extent along with the difference of execution mode.In addition,, although will also be appreciated that development is likely very complicated and time-consuming, concerning having benefited from those skilled in the art of present disclosure, this development is only routine task.
At this, also it should be noted is that, for fear of the details because of unnecessary fuzzy the present invention, only show in the accompanying drawings with according to the closely-related apparatus structure of the solution of the present invention, and omitted other details little with relation of the present invention.
the first embodiment
Fig. 1 shows the schematic diagram of dense wave division multipurpose Transmission System 10 according to an embodiment of the invention, in this experimental system, the wavelength channel of transmitter need to be assigned on multiple delay lines to realize the decorrelation of these wavelength channels.This experimental system based on general principle be that information sequence on the different wave length channel sending at transmitter enough after large delay line, can think that these information sequences are independent of each other through different, length.
As can see from Figure 1, this experimental system 10 comprises N transmitter 110, N × M coupler 120 and M bar delay line 130, and wherein N, M are natural number.Each transmitter comprises multiple wavelength channels.For example, the wavelength of the included wavelength channel of transmitter #1 is respectively λ
1, λ
n+1..., λ
kN+1, the wavelength of the included wavelength channel of transmitter #2 is respectively λ
2, λ
n+2..., λ
kN+2etc., wherein the wavelength difference between adjacent wavelength-channels is Δ λ, that is to say λ
iand λ
i+1between wavelength difference be Δ λ.In order to utilize best the resource of this experimental system, preferably the channel number of different transmitters 110 is identical, or cannot realize channel number identical in the situation that channel number each other differ at most one.In system proposed by the invention, suppose that each transmitter 110 comprises at least M wavelength channel, because if the number of the included wavelength channel of transmitter is less than M, those skilled in the art easily expect, in order to realize the decorrelation between these wavelength channels, these wavelength channels are assigned to respectively on different delay lines.
In the situation that the each transmitter 110 of supposition comprises at least M wavelength channel, a kind of for the wavelength channel of transmitter is assigned to the method on delay line according to the present invention proposes.In Fig. 2, illustrate according to an embodiment of the invention for the wavelength channel of transmitter being assigned to the flow chart of the method on delay line.
As can see from Figure 2, the method comprises:
The first allocation step S210: difference chosen distance M nearest wavelength channel of wavelength channel to be measured the wavelength channel comprising from each transmitter 110, and the M of a selected each transmitter wavelength channel is distributed to M bar delay line correspondingly.The corresponding wavelength of for example supposing wavelength channel to be measured is λ
0, for the transmitter #1 wavelength X of definite wavelength channel wherein respectively
1, λ
n+1..., λ
kN+1with λ
0poor, and therefrom determine the wavelength of absolute value minimum of M difference, corresponding these wavelength wavelength channel is distributed to M bar delay line correspondingly.At this, one by one corresponding expression, two channels of same transmitter can not be assigned to same delay line.Similarly, all carry out this first allocation step for all transmitter #1 to #N, thus by channel allocation nearest N × M range measurement channel wavelength to delay line.In this allocation step, the M having the greatest impact for the wavelength channel to be measured wavelength channel that each transmitter is launched has been assigned to respectively on M bar delay line, thereby ensure the decorrelation between these wavelength channels in experiment, improved the reliability of experiment.
The second allocation step S220: by all the other wavelength channels as far as possible number be assigned to fifty-fifty on M bar delay line 130, and the wavelength channel that to make from any two wavelength difference of same transmitter 110 be N Δ λ is not assigned to identical delay line 130.At this, the average implication of number is as far as possible, possible in the situation that, make described remaining wavelength channel with similar number be assigned on M bar delay line 130.If can not realize mean allocation, the difference of the number of the wavelength channel distributing on each delay line is preferably no more than 1.In addition, because the wavelength channel that is N Δ λ from any two wavelength difference of same transmitter 110 is not assigned to identical delay line 130, therefore any two adjacent wavelength channels that same transmitter 110 is launched can be on identical delay line, each other relevant of this wavelength channel that has also further reduced same transmitter inside, has improved the accuracy of experimental result.
It should be noted that, according to a form of implementation, the first allocation step can circulate.That is to say, after carrying out for the first time the first allocation step, if the number of remaining wavelength channel is greater than N × M, can re-execute the first allocation step to described remaining wavelength channel, thereby again by other N × M the channel allocation that range measurement channel wavelength is nearest to delay line, until the number of remaining wavelength channel is less than N × M, carry out again subsequently the second allocation step.Therefore, in this application, can think the situation of the first allocation step circulation is also contained in the middle of " the first allocation step ".
And according to another form of implementation, can carry out the first allocation step without circulation, but carry out the second allocation step for all remaining wavelength channels after only carrying out first allocation step, and no matter whether the number of remaining wavelength channel is greater than N × M.And from another perspective, also can be considered as the second allocation step and in the situation that all the other wavelength channel numbers are greater than N × M, also can comprise the operation that is similar to above-mentioned the first allocation step,, the operation of the first allocation step can be also so as to realize one of means of mean allocation as far as possible in the second allocation step.
It should be noted that in addition, for the implementation of above-mentioned the first allocation step and the second allocation step, can be all first to carry out the first allocation step for each transmitter 110 respectively, then all carry out again the second allocation step for each transmitter respectively, also possible that first carry out the first allocation step for transmitter #1, then carry out the second allocation step, first carry out again the first allocation step for transmitter #2 subsequently, then carry out the second allocation step, etc., this does not affect essence of the present invention.
By said method, can process the channel of any more number, especially, can in lower equipment complexity situation, carry out multi channel transmission experiment.
the second embodiment
According to embodiments of the invention, propose a kind of for determine the method for delay line length at dense wave division multipurpose Transmission System 10.Fig. 3 shows the flow chart of the method for definite delay line length according to an embodiment of the invention.
As can see from Figure 3, the method comprises:
Step S310: obtain minimum delay time τ
min.This minimum delay time τ
mincan be given in advance, also can calculate according to following formula:
Wherein D is optical fiber dispersion coefficient, and N is transmitter number, and Δ λ is the wavelength difference between adjacent wavelength-channels, α is optical fiber attenuation coefficient, i is natural number, wherein conventionally requires i > 3, to ensure that minimum delay time is enough to realize the decorrelation of wavelength channel.
In step S320, according to minimum delay time τ
mindetermine minimum delay length L
min.Can determine minimum delay length according to following formula:
Wherein n is the refractive index of fibre delay line, and c is the light velocity in vacuum.
Subsequently, in step S330, based on minimum delay length L
mindetermine the corresponding length of delay line.A kind of common method is in the art to utilize arithmetic sequence to determine the length of delay line.For example, a kind of method be by the Design of length of M bar delay line be 0, L, 2L, 3L ..., (M-1) L.Although this method for designing is simple, but there is following shortcoming: the length of delay line difference each other equates, the location interval of signal pulse after these delay lines also equates so, and the stack of these signal pulses just forms the signal with some cycles.Equally, such signal, in the time there is Cross-phase Modulation generation phase noise, also can make phase noise have certain periodicity.Be embodied on phase noise auto-correlation function is exactly to have the larger relevant peaks peak of 40000ps place (in referring to the Fig. 6) in non-zero points.But, in real system, do not have above-mentioned characteristic.For this reason, propose to make the length of delay line to form not arithmetic sequence in the situation that arranging from small to large according to embodiments of the invention, advantageously avoided thus the defect in arithmetic sequence situation, thereby more approached real system.
For example, can utilize following arithmetic sequence to design the corresponding length of delay line: to be arithmetic sequence in this sequence that difference of adjacent two in arithmetic sequence does not form.For example, can use sequence 0, L, 2L+d, 3L+3d, 4L+6d ...,
wherein d ≠ 0.For example, can select d=0.1*L.Can see, the difference of in above-mentioned sequence adjacent two form arithmetic sequence L, L+d, L+2d, L+3d ..., L+ (M-2) d.
According to another embodiment, can utilize following arithmetic sequence to design the corresponding length of delay line: the difference of the Section 2 in arithmetic sequence and Section 1 is not greater than described minimum delay length L
min, and any one starting from Section 3 is two sums before it.For example, can use sequence L, 2L+d, 3L+d, 5L+2d, 8L+3d ..., wherein d ≠ 0.For example, can select d=0.1*L.This sequence builds based on Fibonacci sequence or Lucas sequence.
According to another embodiment, can utilize following arithmetic sequence to design the corresponding length of delay line: this not arithmetic sequence build based on Pei Er sequence.Pei Er sequence is 0,1,2,5,12,29,70 ..., therefore can use sequence L, 2L, 5L, 12L, 29L, 70L ....For example, can utilize Pei Er sequence to be multiplied by minimum delay length and build this not arithmetic sequence.
Based on foregoing description of the present invention, those skilled in the art easily expect designing with other not arithmetic sequence the length of delay line.
Owing to utilizing arithmetic sequence not to design the length of delay line, make to avoid the periodicity that comprises in arithmetic sequence, thereby advantageously improved the decorrelation of the channel on each delay line, make experimental system approach more well real system.
the 3rd embodiment
According to embodiments of the invention, proposed a kind of at dense wave division multipurpose Transmission System by the method for channel decorrelation.Fig. 4 shows according to an embodiment of the invention by the flow chart of the method for channel decorrelation.
As shown in Figure 4, the method comprises the steps:
S410: dense wave division multipurpose Transmission System is provided.As described in conjunction with Figure 1 above, this experimental system 10 comprises N transmitter 110, N × M coupler 120 and M bar delay line 130, and wherein N, M are natural number.Each transmitter comprises multiple wavelength channels.For example, the wavelength of the included wavelength channel of transmitter #1 is respectively λ
1, λ
n+1..., λ
kN+1, the wavelength of the included wavelength channel of transmitter #2 is respectively λ
2, λ
n+2..., λ
kN+2etc., wherein the wavelength difference between adjacent wavelength-channels is Δ λ, that is to say λ
iand λ
i+1between wavelength difference be Δ λ.In order to realize the resource of utilizing best this experimental system, preferably the channel number of different transmitters 110 is identical, or cannot realize channel number identical in the situation that channel number each other differ at most one.In system proposed by the invention, suppose that each transmitter 110 comprises at least M wavelength channel.
In the experimental system providing in step S410, the length of M bar delay line 130 is determined based on arithmetic sequence not.About specifically how utilizing arithmetic sequence not to determine the length of delay line, can be with reference to above-described the second embodiment, no longer repetition here.
In step S420, the wavelength channel of transmitter is assigned on M bar delay line, to realize the channel decorrelation in experimental system.For this reason, preferably use the distribution method of describing according in the first embodiment, respectively by the first allocation step and the second allocation step by all wavelengths channel allocation to M bar delay line.About specifically how distributing wavelength channel, can, referring to above-described the first embodiment, no longer repeat here.
Owing to combining in the method the scheme proposing in the first embodiment and the second embodiment, therefore there is the scheme in the first and second embodiment simultaneously.
the 4th embodiment
According to embodiments of the invention, propose a kind of for the wavelength channel of transmitter being assigned to the wavelength selection unit 140 on delay line at dense wave division multipurpose Transmission System 10.Described system 10 also comprises N transmitter 110, N × M coupler 120 and M bar delay line 130, each transmitter 110 comprises that at least the channel number of M wavelength channel and different transmitters 110 differs at most one, and the wavelength difference between adjacent wavelength-channels is Δ λ, and wherein N, M are natural number
Fig. 5 shows the schematic diagram of wavelength selection unit 140 according to an embodiment of the invention.As we can see from the figure, described wavelength selection unit 140 comprises the first distributor 510, it is arranged to difference chosen distance M nearest wavelength channel of wavelength channel to be measured the wavelength channel comprising from each transmitter 110, and the M of a selected each transmitter wavelength channel is distributed to M bar delay line correspondingly.In addition, wavelength selection unit 140 also comprises the second distributor 520, its be arranged to by all the other wavelength channels as far as possible number be assigned to fifty-fifty on M bar delay line 130, and the wavelength channel that to make from any two wavelength difference of same transmitter 110 be N Δ λ is not assigned to identical delay line 130.About the concrete assigning process of the first distributor and the second distributor, can, referring to above-described the first embodiment, repeat no more here.
By above-mentioned wavelength selection unit, can process the channel of any more number, especially, can in lower equipment complexity situation, carry out multi channel transmission experiment.
the 5th embodiment
According to embodiments of the invention, a kind of collection wave division multiplex transmission experimental system has been proposed, comprise N transmitter 110, N × M coupler 120, M bar delay line 130 and wavelength selection unit 140, each transmitter 110 comprises that at least the channel number of M wavelength channel and different transmitters 110 differs at most one, and the wavelength difference between adjacent wavelength-channels is Δ λ, and wherein N, M are natural number.Wherein the length of the M bar delay line 130 in this experimental system is determined based on arithmetic sequence not.About specifically how utilizing arithmetic sequence not to determine the length of delay line, can be with reference to above-described the second embodiment, no longer repetition here.
Wavelength selection unit 140 in this experimental system comprises the first distributor 510 and the second distributor 520.Concrete function about these distributors can, referring to the description in the 4th embodiment, equally no longer repeat here.
Fig. 6 shows according to the effect of channel decorrelation apparatus and method of the present invention.In Fig. 6, solid line is illustrated in the Phase autocorrelation function about the time in the situation of utilizing arithmetic sequence to determine delay line length, and dotted line represents respectively real system and utilize arithmetic sequence not to determine the Phase autocorrelation function about the time in the situation of delay line length.As can be seen from Figure 6, the in the situation that of arithmetic sequence, there will be sometime larger autocorrelation value (for example, at 40000ps place) due to the period-luminosity relation comprising in arithmetic sequence, and the not arithmetic sequence that the application of the invention proposes, effectively suppress this effect, thereby simulated better the effect of real system.
The first distributor, the second distributor in above-mentioned wavelength selection unit can be configured by the mode of software, firmware, hardware or its combination.Configure spendable concrete means or mode and be well known to those skilled in the art, do not repeat them here.In the situation that realizing by software or firmware, to the computer (example all-purpose computer 700 as shown in Figure 7) with specialized hardware structure, the program that forms this software is installed from storage medium or network, this computer, in the time that various program is installed, can be carried out various functions etc.
In Fig. 7, CPU (CPU) 701 carries out various processing according to the program of storage in read-only memory (ROM) 702 or from the program that storage area 708 is loaded into random access memory (RAM) 703.In RAM 703, also store as required data required in the time that CPU 701 carries out various processing etc.CPU 701, ROM 702 and RAM 703 are connected to each other via bus 704.Input/output interface 705 is also connected to bus 704.
Following parts are connected to input/output interface 705: importation 706 (comprising keyboard, mouse etc.), output 707 (comprise display, such as cathode ray tube (CRT), liquid crystal display (LCD) etc., with loud speaker etc.), storage area 708 (comprising hard disk etc.), communications portion 709 (comprising that network interface unit is such as LAN card, modulator-demodulator etc.).Communications portion 709 via network such as internet executive communication processing.As required, driver 710 also can be connected to input/output interface 705.Detachable media 711, such as disk, CD, magneto optical disk, semiconductor memory etc. are installed on driver 710 as required, is installed in storage area 708 computer program of therefrom reading as required.
In the situation that realizing above-mentioned series of processes by software, from network such as internet or storage medium are such as detachable media 711 is installed the program that forms softwares.
It will be understood by those of skill in the art that this storage medium is not limited to wherein having program stored therein shown in Fig. 7, distributes separately the detachable media 711 so that program to be provided to user with equipment.The example of detachable media 711 comprises disk (comprising floppy disk (registered trade mark)), CD (comprising compact disc read-only memory (CD-ROM) and digital universal disc (DVD)), magneto optical disk (comprising mini-disk (MD) (registered trade mark)) and semiconductor memory.Or storage medium can be hard disk comprising in ROM 702, storage area 708 etc., wherein computer program stored, and be distributed to user together with comprising their equipment.
The present invention also proposes a kind of program product that stores the instruction code that machine readable gets.When described instruction code is read and carried out by machine, can carry out above-mentioned according to the method for the embodiment of the present invention.
Correspondingly, be also included within of the present invention open for carrying the storage medium of the above-mentioned program product that stores the instruction code that machine readable gets.Described storage medium includes but not limited to floppy disk, CD, magneto optical disk, storage card, memory stick etc.
Finally, also it should be noted that, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.In addition, the in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
Although describe by reference to the accompanying drawings above embodiments of the invention in detail, it should be understood that execution mode described above is just for the present invention is described, and be not construed as limiting the invention.For a person skilled in the art, can make various changes and modifications and not deviate from the spirit and scope of the invention above-mentioned execution mode.Therefore, scope of the present invention is only limited by appended claim and equivalents thereof.
Be not difficult to find out by above description, according to embodiments of the invention, provide following scheme:
1. 1 kinds of remarks are for being assigned to the method on delay line at dense wave division multipurpose Transmission System (10) by the wavelength channel of transmitter, wherein said system (10) comprises N transmitter (110), N × M coupler (120) and M bar delay line (130), each transmitter (110) comprises that at least the channel number of M wavelength channel and different transmitters (110) differs at most one, wavelength difference between adjacent wavelength-channels is Δ λ, wherein N, M are natural number, and described method comprises:
The-the first allocation step: difference chosen distance M nearest wavelength channel of wavelength channel to be measured the wavelength channel comprising from each transmitter (110), and the M of a selected each transmitter wavelength channel is distributed to M bar delay line correspondingly, and
The-the second allocation step: by all the other wavelength channels as far as possible number to be assigned to fifty-fifty M bar delay line (130) upper, and the wavelength channel that to make from any two wavelength difference of same transmitter (110) be N Δ λ is not assigned to identical delay line (130).
2. 1 kinds of remarks, for determine the method for delay line length at dense wave division multipurpose Transmission System (10), comprising:
-obtain minimum delay time,
-determine minimum delay length according to minimum delay time, and
-determine the corresponding length of delay line based on minimum delay length, make the length of delay line in the situation that arranging from small to large, form not arithmetic sequence.
Remarks 3. is according to the method described in remarks 2, and the sequence that the difference of adjacent two in wherein said not arithmetic sequence forms is arithmetic sequence.
Remarks 4. is according to the method described in remarks 2, and the Section 2 in wherein said not arithmetic sequence and the difference of Section 1 are greater than described minimum delay length, and any one starting from Section 3 is two sums before it.
Remarks 5. is according to the method described in remarks 2, and wherein arithmetic sequence does not build based on Fibonacci sequence or Lucas sequence.
Remarks 6. is according to the method described in remarks 2, and wherein arithmetic sequence is not multiplied by minimum delay length by Pei Er sequence and builds.
7. 1 kinds of remarks at dense wave division multipurpose Transmission System by the method for channel decorrelation, comprising:
-dense wave division multipurpose Transmission System is provided, wherein said system comprises N transmitter (110), N × M coupler (120) and M bar delay line (130), each transmitter (110) comprises that at least the channel number of M wavelength channel and different transmitters (110) differs at most one, wavelength difference between adjacent wavelength-channels is Δ λ, wherein N, M are natural number, and
-wavelength channel of transmitter (110) is assigned on M bar delay line (130);
The length of wherein said M bar delay line is come to determine by the following method:
-obtain minimum delay time,
-determine minimum delay length according to minimum delay time,
-determine respectively the corresponding length of M bar delay line (130) based on minimum delay length, make the length of delay line in the situation that arranging from small to large, form not arithmetic sequence;
The step wherein wavelength channel of transmitter (110) being assigned on M bar delay line (130) comprises:
The-the first allocation step: difference chosen distance M nearest wavelength channel of wavelength channel to be measured the wavelength channel comprising from each transmitter (110), and the M of a selected each transmitter wavelength channel is distributed to M bar delay line correspondingly, and
The-the second allocation step: by all the other wavelength channels as far as possible number to be assigned to fifty-fifty M bar delay line (130) upper, and the wavelength channel that to make from any two wavelength difference of same transmitter (110) be N Δ λ is not assigned to identical delay line (130).
Remarks 8. is according to the method described in remarks 7, and the sequence that the difference of adjacent two in wherein said not arithmetic sequence forms is arithmetic sequence.
Remarks 9. is according to the method described in remarks 7, and the Section 2 in wherein said not arithmetic sequence and the difference of Section 1 are greater than described minimum delay length, and any one starting from Section 3 is two sums before it.
Remarks 10. is according to the method described in remarks 7, and wherein arithmetic sequence does not build based on Fibonacci sequence or Lucas sequence.
Remarks 11. is according to the method described in remarks 7, and wherein arithmetic sequence is not multiplied by minimum delay length by Pei Er sequence and builds.
12. 1 kinds of remarks are for being assigned to the wavelength selection unit (140) on delay line at dense wave division multipurpose Transmission System (10) by the wavelength channel of transmitter, wherein said system (10) also comprises N transmitter (110), N × M coupler (120) and M bar delay line (130), each transmitter (110) comprises that at least the channel number of M wavelength channel and different transmitters (110) differs at most one, wavelength difference between adjacent wavelength-channels is Δ λ, wherein N, M is natural number, described wavelength selection unit (140) comprising:
The-the first distributor (510), it is arranged to difference chosen distance M nearest wavelength channel of wavelength channel to be measured the wavelength channel comprising from each transmitter (110), and the M of a selected each transmitter wavelength channel is distributed to M bar delay line correspondingly, and
The-the second distributor (520), its be arranged to by all the other wavelength channels as far as possible number to be assigned to fifty-fifty M bar delay line (130) upper, and the wavelength channel that to make from any two wavelength difference of same transmitter (110) be N Δ λ is not assigned to identical delay line (130).
13. 1 kinds of dense wave division multipurpose Transmission Systems of remarks, comprise N transmitter (110), N × M coupler (120), M bar delay line (130) and wavelength selection unit (140), each transmitter (110) comprises that at least the channel number of M wavelength channel and different transmitters (110) differs at most one, wavelength difference between adjacent wavelength-channels is Δ λ, and wherein N, M are natural number
The length of wherein said M bar delay line is come to determine by the following method:
-obtain minimum delay time,
-determine minimum delay length according to minimum delay time,
-determine respectively the corresponding length of M bar delay line (130) based on minimum delay length, make the length of delay line in the situation that arranging from small to large, form not arithmetic sequence;
Wherein wavelength selection unit (140) comprising:
The-the first distributor (510), it is arranged to difference chosen distance M nearest wavelength channel of wavelength channel to be measured the wavelength channel comprising from each transmitter (110), and the M of a selected each transmitter wavelength channel is distributed to M bar delay line correspondingly, and
The-the second distributor (520), its be arranged to by all the other wavelength channels as far as possible number to be assigned to fifty-fifty M bar delay line (130) upper, and the wavelength channel that to make from any two wavelength difference of same transmitter (110) be N Δ λ is not assigned to identical delay line (130).
Remarks 14 is according to the system described in remarks 13, and the sequence that the difference of adjacent two in wherein said not arithmetic sequence forms is arithmetic sequence.
Remarks 15. is according to the system described in remarks 13, and the Section 2 in wherein said not arithmetic sequence and the difference of Section 1 are greater than described minimum delay length, and any one starting from Section 3 is two sums before it.
Remarks 16. is according to the system described in remarks 13, and wherein arithmetic sequence does not build based on Fibonacci sequence or Lucas sequence.
Remarks 17. is according to the system described in remarks 13, and wherein arithmetic sequence is not multiplied by minimum delay length by Pei Er sequence and builds.
18. 1 kinds of program products of remarks, this program product comprises the executable instruction of machine, when carry out described instruction on messaging device time, described instruction makes described messaging device carry out the method as described in remarks 1 or 2.
19. 1 kinds of storage mediums of remarks, this storage medium comprises machine-readable program code, when carry out described program code on messaging device time, described program code makes described messaging device carry out the method as described in remarks 1 or 2.
Claims (2)
- For at dense wave division multipurpose Transmission System by a method for channel decorrelation, comprising:-dense wave division multipurpose Transmission System is provided, wherein said system comprises N transmitter (110), N × M coupler (120) and M bar delay line (130), each transmitter (110) comprises that at least the channel number of M wavelength channel and different transmitters (110) differs at most one, wavelength difference between adjacent wavelength-channels is Δ λ, wherein N, M are natural number, and-wavelength channel of transmitter (110) is assigned on M bar delay line (130);The length of wherein said M bar delay line is come to determine by the following method:-obtain minimum delay time,-determine minimum delay length according to minimum delay time,-determine respectively the corresponding length of M bar delay line (130) based on minimum delay length, make the length of delay line in the situation that arranging from small to large, form not arithmetic sequence;The step wherein wavelength channel of transmitter (110) being assigned on M bar delay line (130) comprises:The-the first allocation step: difference chosen distance M nearest wavelength channel of wavelength channel to be measured the wavelength channel comprising from each transmitter (110), and the M of a selected each transmitter wavelength channel is distributed to M bar delay line correspondingly, andThe-the second allocation step: by all the other wavelength channels as far as possible number be assigned to fifty-fifty on M bar delay line (130), and the wavelength channel that to make from any two wavelength difference of same transmitter (110) be N Δ λ is not assigned to identical delay line (130), whereinDescribed not arithmetic sequence is with lower one: the sequence that the difference of in described not arithmetic sequence adjacent two forms is that the difference of Section 2 in arithmetic sequence, described not arithmetic sequence and Section 1 is greater than described minimum delay length and any one that starts from Section 3 is two sums before it, described not arithmetic sequence based on Fibonacci sequence or Lucas sequence builds and described not arithmetic sequence is multiplied by minimum delay length by Pei Er sequence and builds.
- 2. a dense wave division multipurpose Transmission System, comprise N transmitter (110), N × M coupler (120), M bar delay line (130) and wavelength selection unit (140), each transmitter (110) comprises that at least the channel number of M wavelength channel and different transmitters (110) differs at most one, wavelength difference between adjacent wavelength-channels is Δ λ, and wherein N, M are natural numberThe length of wherein said M bar delay line is come to determine by the following method:-obtain minimum delay time,-determine minimum delay length according to minimum delay time,-determine respectively the corresponding length of M bar delay line (130) based on minimum delay length, make the length of delay line in the situation that arranging from small to large, form not arithmetic sequence;Wherein wavelength selection unit (140) comprising:The-the first distributor (510), it is arranged to difference chosen distance M nearest wavelength channel of wavelength channel to be measured the wavelength channel comprising from each transmitter (110), and the M of a selected each transmitter wavelength channel is distributed to M bar delay line correspondingly, andThe-the second distributor (520), its be arranged to by all the other wavelength channels as far as possible number be assigned to fifty-fifty on M bar delay line (130), and the wavelength channel that to make from any two wavelength difference of same transmitter (110) be N Δ λ is not assigned to identical delay line (130), whereinDescribed not arithmetic sequence is with lower one: the sequence that the difference of in described not arithmetic sequence adjacent two forms is that the difference of Section 2 in arithmetic sequence, described not arithmetic sequence and Section 1 is greater than described minimum delay length and any one that starts from Section 3 is two sums before it, described not arithmetic sequence based on Fibonacci sequence or Lucas sequence builds and described not arithmetic sequence is multiplied by minimum delay length by Pei Er sequence and builds.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6819870B1 (en) * | 1999-11-02 | 2004-11-16 | Alcatel | All-optical networking optical fiber line delay buffering apparatus and method |
| CN1666564A (en) * | 2002-07-10 | 2005-09-07 | 马科尼通讯股份有限公司 | Path protection method for WDM network and nodes thereof |
| CN1694385A (en) * | 2005-05-23 | 2005-11-09 | 电子科技大学 | Node structure in optical group transmission network and optical channel set-up mode |
-
2010
- 2010-06-29 CN CN201010213949.1A patent/CN102315894B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6819870B1 (en) * | 1999-11-02 | 2004-11-16 | Alcatel | All-optical networking optical fiber line delay buffering apparatus and method |
| CN1666564A (en) * | 2002-07-10 | 2005-09-07 | 马科尼通讯股份有限公司 | Path protection method for WDM network and nodes thereof |
| CN1694385A (en) * | 2005-05-23 | 2005-11-09 | 电子科技大学 | Node structure in optical group transmission network and optical channel set-up mode |
Non-Patent Citations (4)
| Title |
|---|
| "快速程控光纤延迟线设计与工艺研究";汪松波;《中国优秀硕士学位论文全文数据库》;20080630;第6-7页 * |
| 在光缓存器中节省光延迟线的技术;王振凯等;《光通信研究》;20040830(第4期);第54-57页 * |
| 汪松波."快速程控光纤延迟线设计与工艺研究".《中国优秀硕士学位论文全文数据库》.2008,第6-7页. |
| 王振凯等.在光缓存器中节省光延迟线的技术.《光通信研究》.2004,(第4期),第55-57页. |
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