CN102315894A - Method for channel allocation, channel decorrelation method and DWDM transmission experiment system - Google Patents
Method for channel allocation, channel decorrelation method and DWDM transmission experiment system Download PDFInfo
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Abstract
The invention discloses a kind of method for channel allocation, channel decorrelation method and DWDM transmission experiment system, to be used for the wavelength channel of transmitter being assigned to delay line in dense wave division multipurpose transmission experiment system.Said method for channel allocation comprises: first allocation step: difference chosen distance M nearest wavelength channel of wavelength channel to be measured from the wavelength channel that each transmitter comprised; And M wavelength channel of each transmitter of being selected distributed to M bar delay line correspondingly; And second allocation step: with all the other wavelength channels as far as possible number be assigned to fifty-fifty on the M bar delay line, and make the wavelength channel that any two wavelength difference from same transmitter are N Δ λ not be assigned to identical delay line.
Description
Technical field
The present invention relates to the communications field, especially relate to the channel decorrelation method and apparatus in the dense wave division multipurpose transmission experiment system, and dense wave division multipurpose transmission experiment system.
Background technology
In dense wave division multipurpose (DWDM) system, (Cross-PhaseModulation, the phase noise that XPM) causes are the one of the main reasons that influences systematic function in the cross-phase modulation.In order to estimate the influence of cross-phase modulation, method commonly used is under lab to carry out the multichannel transmission experiment.Traditional experimental technique is an odd even decorrelation method, and this has been widely used in various multichannel transmission experiments.This method makes all odd-numbered channels through same optical sender, and all even-numbered channels close ripple with all channels at last through another optical sender, forms a dense wave division multipurpose experiment emission system.Yet traditional odd even decorrelation method can not estimate correctly that cross-phase is modulated at the influence in the 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 multichannel transmission experiment, can in the dense wave division multipurpose experimental system, realize the channel decorrelation effectively by this method and apparatus.Provide hereinafter about brief overview of the present invention, so that 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 confirmed key of the present invention or pith, neither be intended to limit scope of the present invention.Its purpose only is to provide some notion with the form of simplifying, with this as the preorder in greater detail of argumentation after a while.
According to one embodiment of present invention; Provide a kind of being used for the wavelength channel of transmitter to be assigned to the method on the delay line in dense wave division multipurpose transmission experiment 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 one at most, and the wavelength difference between the adjacent wavelength-channels is Δ λ, and wherein N, M are natural number; Said method comprises: first allocation step: difference chosen distance M nearest wavelength channel of wavelength channel to be measured from the wavelength channel that each transmitter comprised; And M wavelength channel of each transmitter of being selected distributed to M bar delay line correspondingly, and second allocation step: with all the other wavelength channels as far as possible number be assigned to fifty-fifty on the M bar delay line, and make the wavelength channel that any two wavelength difference from same transmitter are N Δ λ not be assigned to identical delay line.
By this method, can handle the channel of any more number, especially, can under lower complex equipments degree situation, carry out multi channel transmission experiment.
In addition; According to one embodiment of present invention; A kind of method that is used for confirming in dense wave division multipurpose transmission experiment system delay line length also is provided, has comprised: obtain minimum delay time, confirm minimum delay length according to minimum delay time; And confirm the respective length of delay line based on minimum delay length, make the length of delay line under the situation of arranging from small to large, constitute not arithmetic sequence.
Since utilized not arithmetic sequence in the method, thus the periodicity of having avoided sequence to increase, and the periodicity of promptly having avoided adjacent two difference of sequence to have can be simulated real system better.
In addition; According to one embodiment of present invention, a kind of method with the channel decorrelation in dense wave division multipurpose transmission experiment system that is used for is provided also, has comprised: dense wave division multipurpose transmission experiment system is provided; Wherein said system comprises N transmitter; N * M coupler and M bar delay line, each transmitter comprise that at least the channel number of M wavelength channel and different transmitters differs one at most, and the wavelength difference between the adjacent wavelength-channels is Δ λ; Wherein N, M are natural number, and the wavelength channel of transmitter is assigned on the M bar delay line; The length of wherein said M bar delay line is confirmed through following method: obtain minimum delay time; Confirm minimum delay length according to minimum delay time; Based on the respective length that minimum delay length confirms respectively M bar delay line, make the length of delay line under the situation of arranging from small to large, constitute not arithmetic sequence; The step that wherein wavelength channel of transmitter is assigned on the M bar delay line comprises: first allocation step: chosen distance M nearest wavelength channel of wavelength channel to be measured respectively from the wavelength channel that each transmitter comprised; And M wavelength channel of each transmitter of being selected distributed to M bar delay line correspondingly; And second allocation step: with all the other wavelength channels as far as possible number be assigned to fifty-fifty on the M bar delay line, and make the wavelength channel that any two wavelength difference from same transmitter are N Δ λ not be assigned to identical delay line.
The advantage that this method has is that one side can be handled the channel of any more number, can simulate real system better on the other hand.
In addition; According to one embodiment of present invention; Also provide a kind of being used for the wavelength channel of transmitter to be assigned to the wavelength selection unit on the delay line in dense wave division multipurpose transmission experiment system; Wherein said system also comprises N transmitter, and N * M coupler and M bar delay line, each transmitter comprise that at least the channel number of M wavelength channel and different transmitters differs one at most; Wavelength difference between the adjacent wavelength-channels is Δ λ; Wherein N, M are natural number, and said wavelength selection unit comprises: first distributor, and it is arranged to difference chosen distance M nearest wavelength channel of wavelength channel to be measured the wavelength channel that comprises from each transmitter; And M wavelength channel of each transmitter of being selected distributed to M bar delay line correspondingly; And second distributor, its be arranged to all the other wavelength channels as far as possible number be assigned to fifty-fifty on the M bar delay line, and make the wavelength channel that any two wavelength difference from same transmitter are N Δ λ not be assigned to identical delay line.
In addition, according to one embodiment of present invention, a kind of dense wave division multipurpose transmission experiment system is provided also; 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 one at most; Wavelength difference between the adjacent wavelength-channels is Δ λ; Wherein N, M are natural number, and the length of wherein said M bar delay line is confirmed through following method: obtain minimum delay time, confirm minimum delay length according to minimum delay time; Based on the respective length that minimum delay length confirms respectively M bar delay line, make the length of delay line under the situation of arranging from small to large, constitute not arithmetic sequence; Wherein wavelength selection unit comprises: first distributor; It is arranged to difference chosen distance M nearest wavelength channel of wavelength channel to be measured the wavelength channel that comprises from each transmitter; And M wavelength channel of each transmitter of being selected distributed to M bar delay line correspondingly; And second distributor; It is arranged to all the other wavelength channels as far as possible number be assigned to fifty-fifty on the M bar delay line, and make the wavelength channel that any two wavelength difference from same transmitter are N Δ λ not be assigned to identical delay line.
Above-mentioned wavelength selection unit and dense wave division multipurpose transmission experiment system have and the corresponding identical advantage of method.
In addition, embodiments of the invention also provide the computer program that is used to realize said method.
In addition, embodiments of the invention also provide the computer program of computer-readable medium form at least, record the computer program code that is used to realize said method on it.
Description of drawings
The present invention can hereinafter combine the given description of accompanying drawing to be better understood through reference.Said accompanying drawing comprises in this manual and forms the part of this specification together with following detailed description, 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 experiment according to an embodiment of the invention system;
Fig. 2 shows the flow chart that is used for the method on the delay line that the wavelength channel of transmitter is assigned to according to an embodiment of the invention;
Fig. 3 shows the flow chart of the method for definite delay line length according to an embodiment of the invention;
Fig. 4 shows the flow chart of the method with the channel decorrelation according to an embodiment of the invention;
Fig. 5 shows the schematic diagram of wavelength selection unit according to an embodiment of the invention;
Fig. 6 shows the effect according to 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
To combine accompanying drawing that example embodiment of the present invention is described hereinafter.In order to know and for simplicity, in specification, not describe all characteristics of actual execution mode.Yet, should understand, in the process of any this practical embodiments of exploitation, must make a lot of decisions specific to execution mode, so that realize developer's objectives, and these decisions may change along with the difference of execution mode to some extent.In addition, might be very complicated and time-consuming though will also be appreciated that development, concerning the those skilled in the art that have benefited from present disclosure, this development only is customary task.
At this, what also need explain a bit is for fear of having blured the present invention because of unnecessary details, only to show in the accompanying drawings and the closely-related apparatus structure of scheme according to the present invention, and omitted other details little with relation of the present invention.
First embodiment
Fig. 1 shows the schematic diagram of dense wave division multipurpose transmission experiment according to an embodiment of the invention system 10, in this experimental system, need the wavelength channel of transmitter be assigned on a plurality of delay lines to realize the decorrelation of these wavelength channels.This experimental system based on basic principle be that information sequence on the different wave length channel that transmitter sent can think that through after the delay line different, that length is enough big these information sequences are independent of each other.
As from can seeing Fig. 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 all comprises a plurality of 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 wavelength channel that transmitter # 2 is included is respectively λ
2, λ
N+2..., λ
KN+2Or the like, wherein the wavelength difference between the adjacent wavelength-channels is Δ λ, that is to say λ
iAnd λ
I+1Between wavelength difference be Δ λ.In order to utilize the resource of this experimental system best, preferably the channel number of different transmitters 110 is identical, perhaps can't realize under the identical situation of channel number that channel number each other differs one at most.In system proposed by the invention; Supposed that each transmitter 110 comprises M wavelength channel at least; Because if the number of the included wavelength channel of transmitter is less than M; Those skilled in the art expect easily, in order to realize the decorrelation between these wavelength channels, these wavelength channels are assigned to respectively on the different delay lines get final product.
Comprise under the situation of M wavelength channel at least at each transmitter 110 of supposition, the wavelength channel of transmitter is assigned to the method on the delay line according to the present invention proposes a kind of being used for.The flow chart that is used for the method on the delay line that the wavelength channel of transmitter is assigned to according to an embodiment of the invention has been shown among Fig. 2.
As from can seeing Fig. 2, this method comprises:
The first allocation step S210: from the wavelength channel that each transmitter 110 is comprised, distinguish chosen distance M nearest wavelength channel of wavelength channel to be measured, and M wavelength channel of each transmitter of being selected distributed to M bar delay line correspondingly.The corresponding wavelength of for example supposing wavelength channel to be measured is λ
0, then confirm the wavelength X of wavelength channel wherein respectively for transmitter #1
1, λ
N+1..., λ
KN+1With λ
0Poor, and therefrom confirm the wavelength of the absolute value minimum of M difference, the pairing wavelength channel of these wavelength is distributed to M bar delay line correspondingly.At this, corresponding expression is that two channels of same transmitter can not be assigned to same delay line one by one.Likewise, all carry out this first allocation step, thereby give delay line N * M the nearest channel allocation of range measurement channel wavelength for all transmitter #1 to #N.In this allocation step; M the wavelength channel that has the greatest impact for wavelength channel to be measured that each transmitter is launched has been assigned to respectively on the M bar delay line; Thereby guaranteed the decorrelation between these wavelength channels in experiment, improved the reliability of experiment.
The second allocation step S220: with all the other wavelength channels as far as possible number be assigned to fifty-fifty on the M bar delay line 130, and make the wavelength channel that any two wavelength difference from same transmitter 110 are N Δ λ not be assigned to identical delay line 130.At this, the average implication of number is as far as possible, make under the possible situation said remaining wavelength channel with similar number be assigned on the M bar delay line 130.If can not realize mean allocation, then each delay line difference of attending the number of institute's assigned wavelength channel preferably is no more than 1.In addition; The wavelength channel that is N Δ λ owing to any two wavelength difference from same transmitter 110 is not assigned to identical delay line 130; So any two adjacent wavelength channels that same transmitter 110 is launched can not be on the identical delay line; This has also further reduced each other relevant of the inner wavelength channel of same transmitter, has improved the accuracy of experimental result.
Need to prove that according to a form of implementation, first allocation step can circulate.That is to say; After carrying out first allocation step for the first time; If the number of remaining wavelength channel greater than N * M, then can be carried out first allocation step to said remaining wavelength channel again, thereby give delay line with other N * M the channel allocation that the range measurement channel wavelength is nearest once more; Less than N * M, carry out second allocation step up to the number of remaining wavelength channel subsequently again.Therefore, in this application, can think that the situation with first allocation step circulation is also contained in the middle of " first allocation step ".
And according to another form of implementation; Can need not circulation and carry out first allocation step; Carry out second allocation step but only carry out after one time first allocation step to all remaining wavelength channels, and no matter the number of remaining wavelength channel whether greater than N * M.And from another perspective; Also can be regarded as second allocation step and also can comprise the operation that is similar to above-mentioned first allocation step under greater than the situation of N * M at all the other wavelength channel numbers; That is, the operation of first allocation step also can be so as to one of means of realizing mean allocation as far as possible in second allocation step.
Need to prove in addition; For the implementation of above-mentioned first allocation step and second allocation step, can be all to carry out first allocation step earlier to each transmitter 110 respectively, all carry out second allocation step again to each transmitter respectively then; Also possible is to carry out first allocation step to transmitter #1 earlier; Carry out second allocation step then, carry out first allocation step again earlier to transmitter # 2 subsequently, carry out second allocation step then; Or the like, this does not influence essence of the present invention.
Through said method, can handle the channel of any more number, especially, can under lower complex equipments degree situation, carry out multi channel transmission experiment.
Second embodiment
According to embodiments of the invention, a kind of method that is used for confirming in dense wave division multipurpose transmission experiment system 10 delay line length has been proposed.Fig. 3 shows the flow chart of the method for definite delay line length according to an embodiment of the invention.
As from can seeing Fig. 3, this method comprises:
Step S310: obtain minimum delay time τ
MinThis minimum delay time τ
MinCan be given in advance, also can obtain according to computes:
Wherein D is the optical fiber dispersion coefficient, and N is the transmitter number, and Δ λ is the wavelength difference between the adjacent wavelength-channels, and α is the optical fiber attenuation coefficient, and i is a natural number, wherein requires i＞3 usually, is enough to realize the decorrelation of wavelength channel to guarantee minimum delay time.
In step S320, according to minimum delay time τ
MinConfirm the minimum delay length L
MinCan confirm minimum delay length according to following formula:
Wherein n is the refractive index of fibre delay line, and c is the light velocity in the vacuum.
Subsequently, in step S330, based on the minimum delay length L
MinConfirm the respective length of delay line.A kind of common method in the art is to utilize arithmetic sequence to confirm the length of delay line.For example, a kind of method is that the Design of length with M bar delay line is 0, L, 2L, 3L ..., (M-1) L.Though this method for designing is simple; Yet have following shortcoming: the length of delay line difference each other equates; Signal pulse also equates through the location interval behind these delay lines so, and the stack of these signal pulses just forms the signal with some cycles property.Equally, such signal also can make phase noise have certain periodicity when cross-phase modulation generation phase noise takes place.Be embodied on the phase noise auto-correlation function is exactly in non-zero points the bigger relevant peaks peak of 40000ps place (in referring to the Fig. 6) to be arranged.Yet, do not have above-mentioned characteristic in the real system.For this reason, proposed to make that according to embodiments of the invention the length of delay line constitutes not arithmetic sequence under the situation of arranging from small to large, advantageously avoided the defective under the arithmetic sequence situation thus, thereby more near real system.
For example, can utilize following arithmetic sequence to design the respective length of delay line: this not the sequence that constitutes of adjacent two difference in the arithmetic sequence be arithmetic sequence.For example, can use sequence 0, L, 2L+d, 3L+3d, 4L+6d ...,
d ≠ 0 wherein.For example, can select d=0.1*L.Can see, adjacent two difference in the above-mentioned sequence constitute 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 respective length of delay line: second in the arithmetic sequence and first difference be not greater than said minimum delay length L
Min, and be two sums in its front since the 3rd any one.For example, can use sequence L, 2L+d, 3L+d, 5L+2d, 8L+3d ..., d ≠ 0 wherein.For example, can select d=0.1*L.This sequence is based on that Fibonacci sequence or Lucas sequence make up.
According to another embodiment, can utilize following arithmetic sequence to design the respective length of delay line: this not arithmetic sequence make up based on the Pei Er sequence.The 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 the Pei Er sequence to multiply by minimum delay length and make up this not arithmetic sequence.
Based on foregoing description of the present invention, those skilled in the art expect using other not arithmetic sequence to design the length of delay line easily.
Owing to utilize arithmetic sequence not to design the length of delay line, make and avoided the periodicity that comprises in the arithmetic sequence, thereby advantageously improved the decorrelation of the channel on each delay line, make experimental system more well near real system.
The 3rd embodiment
According to embodiments of the invention, a kind of method with the channel decorrelation in dense wave division multipurpose transmission experiment system that is used for has been proposed.Fig. 4 shows the flow chart of the method with the channel decorrelation according to an embodiment of the invention.
As shown in Figure 4, this method comprises the steps:
S410: dense wave division multipurpose transmission experiment system is provided.As described in conjunction with Figure 1 in front, 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 all comprises a plurality of 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 wavelength channel that transmitter # 2 is included is respectively λ
2, λ
N+2..., λ
KN+2Or the like, wherein the wavelength difference between the adjacent wavelength-channels is Δ λ, that is to say λ
iAnd λ
I+1Between wavelength difference be Δ λ.In order to realize utilizing best the resource of this experimental system, preferably the channel number of different transmitters 110 is identical, perhaps can't realize under the identical situation of channel number that channel number each other differs one at most.In system proposed by the invention, supposed that each transmitter 110 comprises M wavelength channel at least.
In the experimental system that in step S410, is provided, the length of M bar delay line 130 is based on that arithmetic sequence not confirms.About specifically how utilizing arithmetic sequence not to confirm the length of delay line, can be with reference to above-described second embodiment, no longer repetition here.
In step S420, the wavelength channel of transmitter is assigned on the M bar delay line, to realize the channel decorrelation in the experimental system.For this reason, preferably use the distribution method of describing according among first embodiment, promptly give M bar delay line through first allocation step and second allocation step with all wavelengths channel allocation respectively.About specifically how distributing wavelength channel, can no longer repeat here referring to above-described first embodiment.
Owing to the scheme that has combined in the method to be proposed among first embodiment and second embodiment, therefore has the advantage of the scheme among first and second embodiment simultaneously.
The 4th embodiment
According to embodiments of the invention, proposed a kind of being used for the wavelength channel of transmitter to be assigned to the wavelength selection unit 140 on the delay line in dense wave division multipurpose transmission experiment system 10.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 one at most, and the wavelength difference between the 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.From figure, can see; Said wavelength selection unit 140 comprises first distributor 510; It is arranged to difference chosen distance M nearest wavelength channel of wavelength channel to be measured from the wavelength channel that each transmitter 110 is comprised, and M wavelength channel of each transmitter of being selected distributed to M bar delay line correspondingly.In addition; Wavelength selection unit 140 also comprises second distributor 520; It is arranged to all the other wavelength channels as far as possible number be assigned to fifty-fifty on the M bar delay line 130, and make the wavelength channel that any two wavelength difference from same transmitter 110 are N Δ λ not be assigned to identical delay line 130.About the concrete assigning process of first distributor and second distributor, can repeat no more here referring to above-described first embodiment.
Through above-mentioned wavelength selection unit, can handle the channel of any more number, especially, can under lower complex equipments degree situation, carry out multi channel transmission experiment.
The 5th embodiment
According to embodiments of the invention; Propose a kind of collection wavelength division multiplexing transmission experiment system, comprised 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 one at most, and the wavelength difference between the 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 based on that arithmetic sequence not confirms.About specifically how utilizing arithmetic sequence not to confirm the length of delay line, can be with reference to above-described second embodiment, no longer repetition here.
Fig. 6 shows the effect according to channel decorrelation apparatus and method of the present invention.In Fig. 6; Solid line is illustrated under the situation of utilizing arithmetic sequence to confirm delay line length the phase place auto-correlation function about the time, and dotted line is represented real system respectively and utilize arithmetic sequence not to confirm the phase place auto-correlation function about the time under the situation of delay line length.As can be seen from Figure 6; Under the situation of arithmetic sequence; Bigger autocorrelation value (for example at the 40000ps place) can appear sometime owing to the period-luminosity relation that is comprised in the arithmetic sequence; And the not arithmetic sequence that the application of the invention proposes has suppressed this effect effectively, thereby has simulated the effect of real system better.
First distributor in the above-mentioned wavelength selection unit, second distributor can be configured through the mode of software, firmware, hardware or its combination.Dispose spendable concrete means or mode and be well known to those skilled in the art, repeat no more at this.Under situation about realizing through software or firmware; From storage medium or network the program that constitutes this software is installed to the computer with specialized hardware structure (all-purpose computer 700 for example shown in Figure 7); This computer can be carried out various functions etc. when various program is installed.
In Fig. 7, CPU (CPU) 701 carries out various processing according to program stored among 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 data required when CPU 701 carries out various processing or the like as required.CPU 701, ROM 702 and RAM 703 are connected to each other via bus 704.Input/output interface 705 also is connected to bus 704.
Following parts are connected to input/output interface 705: importation 706 (comprising keyboard, mouse or the like), output 707 (comprise display; Such as cathode ray tube (CRT), LCD (LCD) etc. and loud speaker etc.), storage area 708 (comprising hard disk etc.), communications portion 709 (comprising that NIC is such as LAN card, modulator-demodulator etc.).Communications portion 709 is handled such as the internet executive communication via network.As required, driver 710 also can be connected to input/output interface 705.Detachable media 711 is installed on the driver 710 such as disk, CD, magneto optical disk, semiconductor memory or the like as required, makes the computer program of therefrom reading be installed to as required in the storage area 708.
Realizing through software under the situation of above-mentioned series of processes, such as detachable media 711 program that constitutes software is being installed such as internet or storage medium from network.
It will be understood by those of skill in the art that this storage medium is not limited to shown in Figure 7 wherein having program stored therein, distribute so that the detachable media 711 of program to be provided to the user with equipment with being separated.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.Perhaps, storage medium can be hard disk that comprises in ROM 702, the storage area 708 or the like, computer program stored wherein, and be distributed to the user with the equipment that comprises them.
The present invention also proposes a kind of program product that stores the instruction code of machine-readable.When said instruction code is read and carried out by machine, can carry out above-mentioned method according to the embodiment of the invention.
Correspondingly, the storage medium that is used for carrying the program product of the above-mentioned instruction code that stores machine-readable is also included within of the present invention open.Said storage medium includes but not limited to floppy disk, CD, magneto optical disk, storage card, memory stick or the like.
At last; Also need to prove; Term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability; Thereby make to comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or also be included as this process, method, article or equipment intrinsic key element.In addition, under the situation that do not having much more more restrictions, the key element that limits by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises said key element and also have other identical element.
Though more than combine accompanying drawing to describe embodiments of the invention in detail, should be understood that top described execution mode just is used to explain the present invention, and be not construed as limiting the invention.For a person skilled in the art, can make various modifications and change to above-mentioned execution mode and do not deviate from essence of the present invention and scope.Therefore, scope of the present invention is only limited appended claim and equivalents thereof.
Description through above is not difficult to find out, according to embodiments of the invention, following scheme is provided:
1. 1 kinds of remarks are used in dense wave division multipurpose transmission experiment system (10) wavelength channel of transmitter being assigned to the method on the delay line; Wherein said system (10) comprises N transmitter (110); N * M coupler (120) and M bar delay line (130), each transmitter (110) comprise that at least the channel number of M wavelength channel and different transmitters (110) differs one at most, and the wavelength difference between the adjacent wavelength-channels is Δ λ; Wherein N, M are natural number, and said method comprises:
-the first allocation step: difference chosen distance M nearest wavelength channel of wavelength channel to be measured from the wavelength channel that each transmitter (110) is comprised; And M wavelength channel of each transmitter of being selected distributed to M bar delay line correspondingly, and
-the second allocation step: with all the other wavelength channels as far as possible number be assigned to fifty-fifty on the M bar delay line (130), and make the wavelength channel that any two wavelength difference from same transmitter (110) are N Δ λ not be assigned to identical delay line (130).
2. 1 kinds of methods that are used for confirming in dense wave division multipurpose transmission experiment system (10) delay line length of remarks comprise:
-obtain minimum delay time,
-confirm minimum delay length according to minimum delay time, and
-confirm the respective length of delay line based on minimum delay length, make the length of delay line under the situation of arranging from small to large, constitute not arithmetic sequence.
Remarks 3. is according to remarks 2 described methods, and the sequence that adjacent two difference in the wherein said not arithmetic sequence constitutes is an arithmetic sequence.
Remarks 4. is according to remarks 2 described methods, in the wherein said not arithmetic sequence second with first difference greater than said minimum delay length, and be two sums in its front since the 3rd any one.
Remarks 5. is according to remarks 2 described methods, and wherein arithmetic sequence does not make up based on Fibonacci sequence or Lucas sequence.
Remarks 6. is according to remarks 2 described methods, and wherein arithmetic sequence not multiply by minimum delay length by the Pei Er sequence and makes up.
Remarks is used for the method with the channel decorrelation in dense wave division multipurpose transmission experiment system for 7. 1 kinds, comprising:
-dense wave division multipurpose transmission experiment system is provided; Wherein said system comprises N transmitter (110); N * M coupler (120) and M bar delay line (130), each transmitter (110) comprise that at least the channel number of M wavelength channel and different transmitters (110) differs one at most, and the wavelength difference between the adjacent wavelength-channels is Δ λ; Wherein N, M are natural number, and
-wavelength channel of transmitter (110) is assigned on the M bar delay line (130);
The length of wherein said M bar delay line is confirmed through following method:
-obtain minimum delay time,
-confirm minimum delay length according to minimum delay time,
-based on the respective length that minimum delay length confirms respectively M bar delay line (130), make the length of delay line under the situation of arranging from small to large, constitute not arithmetic sequence;
The step that wherein wavelength channel of transmitter (110) is assigned on the M bar delay line (130) comprises:
-the first allocation step: difference chosen distance M nearest wavelength channel of wavelength channel to be measured from the wavelength channel that each transmitter (110) is comprised; And M wavelength channel of each transmitter of being selected distributed to M bar delay line correspondingly, and
-the second allocation step: with all the other wavelength channels as far as possible number be assigned to fifty-fifty on the M bar delay line (130), and make the wavelength channel that any two wavelength difference from same transmitter (110) are N Δ λ not be assigned to identical delay line (130).
Remarks 8. is according to remarks 7 described methods, and the sequence that adjacent two difference in the wherein said not arithmetic sequence constitutes is an arithmetic sequence.
Remarks 9. is according to remarks 7 described methods, in the wherein said not arithmetic sequence second with first difference greater than said minimum delay length, and be two sums in its front since the 3rd any one.
Remarks 11. is according to remarks 7 described methods, and wherein arithmetic sequence not multiply by minimum delay length by the Pei Er sequence and makes up.
12. 1 kinds of remarks are used in dense wave division multipurpose transmission experiment system (10) wavelength channel of transmitter being assigned to the wavelength selection unit (140) on the delay line; 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 one at most; Wavelength difference between the adjacent wavelength-channels is Δ λ, and wherein N, M are natural number, and said wavelength selection unit (140) comprising:
-the first distributor (510); It is arranged to difference chosen distance M nearest wavelength channel of wavelength channel to be measured from the wavelength channel that each transmitter (110) is comprised; And M wavelength channel of each transmitter of being selected distributed to M bar delay line correspondingly, and
-the second distributor (520); It is arranged to all the other wavelength channels as far as possible number be assigned to fifty-fifty on the M bar delay line (130), and make the wavelength channel that any two wavelength difference from same transmitter (110) are N Δ λ not be assigned to identical delay line (130).
13. 1 kinds of dense wave division multipurpose transmission experiments of remarks 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 one at most; Wavelength difference between the adjacent wavelength-channels is Δ λ, and wherein N, M are natural number
The length of wherein said M bar delay line is confirmed through following method:
-obtain minimum delay time,
-confirm minimum delay length according to minimum delay time,
-based on the respective length that minimum delay length confirms respectively M bar delay line (130), make the length of delay line under the situation of arranging from small to large, constitute not arithmetic sequence;
Wherein wavelength selection unit (140) comprising:
-the first distributor (510); It is arranged to difference chosen distance M nearest wavelength channel of wavelength channel to be measured from the wavelength channel that each transmitter (110) is comprised; And M wavelength channel of each transmitter of being selected distributed to M bar delay line correspondingly, and
-the second distributor (520); It is arranged to all the other wavelength channels as far as possible number be assigned to fifty-fifty on the M bar delay line (130), and make the wavelength channel that any two wavelength difference from same transmitter (110) are N Δ λ not be assigned to identical delay line (130).
Remarks 14 is according to remarks 13 described systems, and the sequence that adjacent two difference in the wherein said not arithmetic sequence constitutes is an arithmetic sequence.
Remarks 15. is according to remarks 13 described systems, in the wherein said not arithmetic sequence second with first difference greater than said minimum delay length, and be two sums in its front since the 3rd any one.
Remarks 16. is according to remarks 13 described systems, and wherein arithmetic sequence does not make up based on Fibonacci sequence or Lucas sequence.
Remarks 17. is according to remarks 13 described systems, and wherein arithmetic sequence not multiply by minimum delay length by the Pei Er sequence and makes up.
18. 1 kinds of program products of remarks, this program product comprises the executable instruction of machine, when on messaging device, carrying out said instruction, said instruction makes said messaging device carry out like remarks 1 or 2 described methods.
19. 1 kinds of storage mediums of remarks, this storage medium comprises machine-readable program code, when on messaging device, carrying out said program code, said program code makes said messaging device carry out like remarks 1 or 2 described methods.
Claims (10)
1. one kind is used in dense wave division multipurpose transmission experiment system (10) wavelength channel of transmitter being assigned to the method on the delay line; Wherein said system (10) comprises N transmitter (110); N * M coupler (120) and M bar delay line (130), each transmitter (110) comprise that at least the channel number of M wavelength channel and different transmitters (110) differs one at most, and the wavelength difference between the adjacent wavelength-channels is Δ λ; Wherein N, M are natural number, and said method comprises:
-the first allocation step: difference chosen distance M nearest wavelength channel of wavelength channel to be measured from the wavelength channel that each transmitter (110) is comprised; And M wavelength channel of each transmitter of being selected distributed to M bar delay line correspondingly, and
-the second allocation step: with all the other wavelength channels as far as possible number be assigned to fifty-fifty on the M bar delay line (130), and make the wavelength channel that any two wavelength difference from same transmitter (110) are N Δ λ not be assigned to identical delay line (130).
2. one kind is used for the method with the channel decorrelation in dense wave division multipurpose transmission experiment system, comprising:
-dense wave division multipurpose transmission experiment system is provided; Wherein said system comprises N transmitter (110); N * M coupler (120) and M bar delay line (130), each transmitter (110) comprise that at least the channel number of M wavelength channel and different transmitters (110) differs one at most, and the wavelength difference between the adjacent wavelength-channels is Δ λ; Wherein N, M are natural number, and
-wavelength channel of transmitter (110) is assigned on the M bar delay line (130);
The length of wherein said M bar delay line is confirmed through following method:
-obtain minimum delay time,
-confirm minimum delay length according to minimum delay time,
-based on the respective length that minimum delay length confirms respectively M bar delay line (130), make the length of delay line under the situation of arranging from small to large, constitute not arithmetic sequence;
The step that wherein wavelength channel of transmitter (110) is assigned on the M bar delay line (130) comprises:
-the first allocation step: difference chosen distance M nearest wavelength channel of wavelength channel to be measured from the wavelength channel that each transmitter (110) is comprised; And M wavelength channel of each transmitter of being selected distributed to M bar delay line correspondingly, and
-the second allocation step: with all the other wavelength channels as far as possible number be assigned to fifty-fifty on the M bar delay line (130), and make the wavelength channel that any two wavelength difference from same transmitter (110) are N Δ λ not be assigned to identical delay line (130).
3. method according to claim 2, the sequence that adjacent two difference in the wherein said not arithmetic sequence constitutes is an arithmetic sequence.
4. method according to claim 2, in the wherein said not arithmetic sequence second with first difference greater than said minimum delay length, and be two sums in its front since the 3rd any one.
5. method according to claim 2, wherein arithmetic sequence does not make up based on Fibonacci sequence or Lucas sequence.
6. method according to claim 2, wherein arithmetic sequence not multiply by minimum delay length by the Pei Er sequence and makes up.
7. dense wave division multipurpose transmission experiment 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 one at most; Wavelength difference between the adjacent wavelength-channels is Δ λ, and wherein N, M are natural number
The length of wherein said M bar delay line is confirmed through following method:
-obtain minimum delay time,
-confirm minimum delay length according to minimum delay time,
-based on the respective length that minimum delay length confirms respectively M bar delay line (130), make the length of delay line under the situation of arranging from small to large, constitute not arithmetic sequence;
Wherein wavelength selection unit (140) comprising:
-the first distributor (510); It is arranged to difference chosen distance M nearest wavelength channel of wavelength channel to be measured from the wavelength channel that each transmitter (110) is comprised; And M wavelength channel of each transmitter of being selected distributed to M bar delay line correspondingly, and
-the second distributor (520); It is arranged to all the other wavelength channels as far as possible number be assigned to fifty-fifty on the M bar delay line (130), and make the wavelength channel that any two wavelength difference from same transmitter (110) are N Δ λ not be assigned to identical delay line (130).
8. system according to claim 7, the sequence that adjacent two difference in the wherein said not arithmetic sequence constitutes is an arithmetic sequence.
9. system according to claim 7, in the wherein said not arithmetic sequence second with first difference greater than said minimum delay length, and be two sums in its front since the 3rd any one.
10. system according to claim 7, wherein arithmetic sequence not multiply by minimum delay length by the Pei Er sequence and makes up.
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