CN104410452B - A kind of long range coherent optical communication system transmission performance optimization method - Google Patents
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Abstract
The present invention in order to solve the problems, such as over long distances, span quantity is big, span index not etc., non-dispersive compensates the transmission performance of relevant optical transmission system and is difficult to quickly carry out global optimization, it is proposed a kind of long range coherent optical communication system transmission performance optimization method comprising the steps of: the optimal performance parameter of entire optical communication link is calculated based on link attenuation and amplifier noise characteristic；Set the range and initial value of one group of weighting coefficient (m, t)；Consider the optimal difference of amplifier gain and factor setting module Mea (m, t, n) of amplifier span position two, corresponding Kmin amplifier span position M when selecting Mea largerk, taking amplifier gain is Aopt,Mk, wherein k=1~Kmin, other amplifier gains are its initial value.The present invention is not only considering to promote optical path performance indicator Q factor, but also avoids regulated quantity excessive or adjust the transient responses such as number excessive caused shake, time delay, realizes optical transmission system performance rapid Optimum in extra long distance, the big situation of span quantity.
Description
Technical field
A kind of coherent light communication system when the present invention is the method for realizing long-distance optical communication more particularly to big span quantity
The optimization method for transmission performance of uniting.
Background technique
Due to optical fiber transmission in by complicated factors such as dispersion, spontaneous gain radiation (ASE) noise, fiber nonlinear effects
Influence, dynamic light path exchange scene under, the original configuration of link attenuation and gain is often and non-optimal, and which has limited biographies
Defeated performance, it is therefore desirable to optimize.Current optical communication system transmission performance optimization scheme mainly for direct detection system,
Including adjusting the schemes such as source node transmission power, the dispersion compensation for adjusting dynamic add drop multiplex (ROADM) node and attenuation.
Adjust source node transmission power scheme.First according to transmitter power initially set, the light letter of receiving end is calculated
It makes an uproar than (OSNR).If optical signal to noise ratio is too small, the signal light power of source node injection fibre is improved, keeps optical path integrally non-linear
Phase shift keeps lower value, to guarantee receiving end optical signal to noise ratio hit the target.
Adjust dispersion compensation and attenuation scheme.Each ROADM node to dispersion compensation and attenuation be adjusted from
And achieve the purpose that dynamic optimization.Assuming that the dispersion compensator of each node, decaying can with dynamic regulation, since source node,
It successively calculates by the OSNR of each node, residual dispersion, the input/output signal optical power of node and accumulation nonlinear phase shift.
The attenuation and chromatic dispersion compensation quantity of each node are adjusted, until OSNR, residual dispersion, input/output signal optical power and
Residual dispersion meets pre-provisioning request and then optimizes completion.The general default transport link span of this method is equivalent configuration, i.e., each span
Parameter includes that fiber type, fiber lengths, fibre-optical dispersion, non-linear, attenuation coefficient etc. are all identical.Therefore, above scheme
Direct detection system suitable for regular link, with dispersion compensation, can not suitable for node non-dispersive compensate coherent light
Transmission system, each different system of span transmission configuration.
For relevant optical transmission system, there are also the simplex optimization methods based on Stage by Stage Optimum or based on maximal regulated amount.
This method or the maximal regulated amount that each node is simply optimized or only considered according to order from front to back.Therefore
It may be only available for the system that transmission range is shorter, transmission span number is less.When for long range, span quantity big system,
Optimization efficiency is lower, cannot achieve the global optimization effect that order is adjusted to regulated quantity and website.
Summary of the invention
In order to solve over long distances, span quantity is big, span index not etc., the biography of the relevant optical transmission system of non-dispersive compensation
Defeated performance is difficult to the problem of quickly carrying out global optimization, and the present invention proposes that a kind of long range coherent optical communication system transmission performance is excellent
Change method, dynamic adjust the gain of image intensifer in source transmission power and several spans, improve optimization efficiency.
Assuming that optical transmission system link is there are N number of span, system receiving terminal (RD) signal quality parameter (Q value) by shadow
Sound is in the incident optical power (P) of transmitting terminal (TD), the gain (A of each amplifiern, n=1~N), the length (L of each spann, n=1
~N) and each amplifier noise characteristic.Before system optimization, there are launched power initial value (Ps), at the beginning of each amplifier gain
Initial value (As,n, n=1~N).Under conditions of the decaying of each span, each amplifier noise characteristic determine, the optimal (Q of Q valueopt)
When corresponding system parameter be optimal launched power (Popt), optimal amplifier gain (AOpt, n).When the performance requirement of Transmission system
(make Q close to optimalopt>Q>Qref, wherein QrefGuarantee index value required by reliable transmission for preset one) when, the present invention will
Optimal difference ABS (the Δ A of amplifier gainn)=| Aopt,n-As,n| and amplifier span position (n, near TD amplifier across
Section is set to 1, sequentially numbers to the direction RD) weighted array of two factors selects to meet transporting as module
Minimum amplifier when energy demand adjusts quantity.
Long range coherent optical communication system transmission performance optimization method of the present invention comprising the steps of:
Step 1 is based on each span decaying of link and amplifier noise characteristic, calculates the optimality of entire optical communication link
Energy parameter, the optimal launched power (P including first segment optical fiberopt), optimal amplifier gain (Aopt,n), then obtain amplifier
Optimal difference ABS (the Δ A of gainn)=| Aopt,n-As,n|；
Step 2, the range and initial value for setting one group of weighting coefficient (m, t)；
Step 3 considers the optimal difference of the amplifier gain and the factor of amplifier span position two, setting measurement mark
Standard is Mea=mABS (Δ An)-tn, according to the m of hypothesis, t value calculates Mea (n)；It is corresponding when selecting Mea (n) larger
K (K >=1) amplifier span position (n=M1,…,MK), corresponding amplifier gain is set to Aopt,M1,…,Aopt,MK,
Other amplifier gains are its initial value As,n(n=1~N, and n ≠ M1,…,MK), make system Q > Qref；
Step 4, the value for changing the weighting coefficient (m, t) in predetermined range, re-execute previous step (step
3)；The value of the weighting coefficient is varied multiple times, then obtains one group of data K (m, t) through step 3；
Value K when step 5, selection K (m, t) are minimummin, corresponding weighting coefficient values mmin, tminAmplifier adjusts a at this time
Number is KminA, obtaining corresponding amplifier gain according to step 3 result is respectively Aopt,Mk, wherein k=1~Kmin。
In step 3~4, launched power uses the optimal launched power (Popt)。
After above-mentioned steps, it is only necessary to K in linkminThe gain of a amplifier is adjusted, and makes corresponding amplification
Device gain is from its initial value As,MkIt is adjusted to Aopt,Mk(k=1~Km)。
The difference of the content of present invention and the prior art is, is increased by using in optimization process based on adjusting amplifier
The cumulative effects of the measure coefficient, are used to choose optimal adjusting by the measure coefficient of benefit and amplifier chain position double grading
Node and amplifier optimal value can effectively reduce the amplifier number of the required adjusting during transmission performance optimization.The present invention
In optic path performance optimization process, both consider to promote optical path performance indicator Q factor, it is also considered that avoid optical path entire gain
Regulated quantity is excessive or adjusts the excessive caused shake of number, time delay, transient response, while also reducing network operation expense,
Realize extra long distance, span quantity it is big in the case where be concerned with optical transmission system performance rapid Optimum.
Detailed description of the invention
Fig. 1 is the long distance optical communication systems configuration schematic diagram that span index does not wait
Fig. 2 is the embodiment of optical communication system transmission performance optimization method flow of the present invention
Fig. 3 is that the numerical result of optical communication system transmission performance optimization of the present invention is illustrated
Specific embodiment
With reference to the accompanying drawing, embodiments of the present invention are described in further detail.
In correspondence system link as shown in Figure 1, give optical path configuration (such as transmitter power, each section of optical fiber parameter, respectively across
Section amplifier gain, noise figure etc.) condition, it is assumed that there are N number of spans for optical transmission system link, in system receiving terminal (RD)
Gain (the A of the impacted incident optical power (P) in system transmitting terminal (TD) of signal quality parameter (Q value), each amplifiern, n=1
~N), the length (L of each spann, n=1~N) and each amplifier noise characteristic.
Such as a kind of method of computing system mass parameter (Q value) is to be applicable in optical signal to noise ratio cascaded computation, i.e. Q=SNRRx。
After the fiber span cascade different by several segments fiber lengths, amplifier gain is different, the final signal-to-noise ratio of receiving terminal system
The transmission performance appraisal procedure of entire span is added summation using each span signal-to-noise ratio inverse and obtains, as shown in formula (1).
Wherein n-th of span Signal to Noise Ratio (SNR)nOnly by ASE noise generated in the span and nonlinear noise caused by,
After the span amplifier, SNRnIt may be expressed as:
Wherein PIn, nFor incident optical signal power (the wherein P of n-th of spanIn, 1Transmitting terminal as described above enters fine light function
Rate P), it is assumed that each section of optical fiber is in addition to length is different, other optical fiber intrinsic parameters are all the same, wherein PASEFor magnification method
Noise power, such as when image intensifer is EDFA, can be expressed as
Wherein, An-1For (n-1)th span amplifier gain, NF is its amplifier noise index, and h is planck constant,
C is the light velocity, and λ is wavelength, BWDMFor wavelength-division multiplex system bandwidth.
PNLI, nFor nonlinear noise power, such as when image intensifer is EDFA, can be expressed as
(bibliography of formula 4 is shown in P.Poggiolini, ' The GN model of non-linear
propagation in uncompensated coherent optical systems,’Journal of Lightwave
Technology,vol.30,no.24,3857-3879)
With the increase of span number and transmission range, the regulated quantity of link configuration can also be dramatically increased.Present invention selection
Amplifier adjusts the case where minimum number when meeting transmission performance demand.Before system optimization, there are launched power initial values
(Ps), each amplifier gain initial value (As,n, n=1~N).It is determined in the decaying of each span, each amplifier noise characteristic
Under the conditions of, the optimal (Q of Q valueopt) when corresponding system parameter be optimal launched power (Popt), optimal amplifier gain (AOpt, n)。
When the performance requirement of Transmission system (makes Q close to optimalopt>Q>Qref, wherein QrefGuarantee required by reliable transmission for preset one
Index value) when, in order to as few as possible in link amplifier configuration be adjusted, effectively optimization link transmission performance,
The present invention is by optimal difference ABS (the Δ A of amplifier gainn)=| Aopt,n-As,n| and amplifier span position (n, near TD's
Amplifier span position is 1, is sequentially numbered to the direction RD) weighted array of two factors selects to expire as module
Minimum adjustment amount when sufficient transmission performance demand.
The embodiment of optical communication system transmission performance optimization method flow is as shown in Figure 2, the specific steps are as follows:
Step 1 is based on each span decaying of link and amplifier noise characteristic, calculates the optimality of entire optical communication link
It can parameter.Specifically, the present embodiment includes step 101:
Step 101 passes through first segment optical fiber launched power and to AnThe method for traversing value is calculated according to formula (1)-(4)
Out in system first segment optical fiber optimal launched power (Popt), optimal amplifier gain (Aopt,n).Wherein PoptAnd AOpt, nIt is to connect
Corresponding first section optical fiber launched power and a span section amplifier gain of n-th (n=1~N) when receiving end signal-to-noise ratio maximum.According to
AOpt, nThe optimal difference of amplifier gain is calculated, the optimal difference of amplifier gain is defined as optimal amplifier gain and amplification
Absolute value of the difference between device gain initial value is expressed as ABS (Δ An)=| Aopt,n-As,n|；
Step 2, the range and initial value for setting one group of weighting coefficient (m, t) include specifically step 201~202:
Step 201, setting m constant interval [m1, m2], initialization m=m1；
Step 202, setting t constant interval [t1, t2], initialization t=t1；
In step 201-202, as a most preferred embodiment, the variation range of the weighting coefficient m and/or t is set
For [δ, 1], wherein δ be one close to 0 positive number, such as 0.1.
Step 3: considering that the optimal difference of amplifier gain and the factor of amplifier span position two, optimized be calculated are put
Big device adjusts number and corresponding amplifier span position.Specifically, the present embodiment includes step 301~303:
Step 301, setting module are Mea=mABS (Δ An)-tn, according to the m of hypothesis, t value calculates Mea
(n).The m fixed based on one group, t value, if execute step 301 for the first time, corresponding amplifier span when selecting Mea (n) maximum
Position n=M1Amplifier gain be set as Aopt,M1；If kth time executes step 301, continue to correspond to when selection Mea (n) kth is big
Amplifier span position n=MkAmplifier gain be set as Aopt,Mk；Other amplifier gains are its initial value As,n(n=1~
N, n ≠ Mk, k=1~K), calculate Q value.
Step 302 judges whether Q > Qref, if so, entering step 303, otherwise return to step 301
Step 303 determines that amplifier adjusts number.Take variable count, initial value 0, step 301 of every execution
Then plus 1, therefore when meeting step 302 condition, it is assumed that execute step 301 and amount to K time, then the weighting coefficient of corresponding one group of determination
(m, t) has count=K (m, t).
Step 4, change in predetermined range the weighting coefficient (m, t) value (such as preset range be [0.1,1],
Increasing step-length every time is 0.1), to re-execute previous step (step 3)；The value of the weighting coefficient is varied multiple times until to m, t
Traversal terminate, then obtain one group of data K (m, t) through step 3, specifically, the present embodiment include step 401~404:
Step 401 judges whether otherwise t over range (t > t2) enters step 403 if yes then enter step 402；
Step 402 judges whether otherwise m over range (m > m2) enters step 404 if yes then enter step 501；
Step 403, numerical value t increase Δ t, enter step 301 according to step-size change；
Step 404, numerical value m increase Δ m, enter step 301 according to step-size change；
Step 5 chooses minimum value in one group of obtained data K (m, t), exports corresponding regulated quantity and Q value, specifically,
Include step 501:
Value K when step 501, selection K (m, t) are minimummin, corresponding weighting coefficient values (mmin、tmin), amplifier at this time
Adjusting number is KminA, it is A that step 3, which has obtained corresponding amplifier gain,opt,Mk, wherein k=1~Kmin.Obtain corresponding need
Amplifier span position, regulated quantity and the Q value to be adjusted
Fig. 3 is that one section of 20 span length is different and the optical fiber link of random distribution, wherein adjustable object
Reason amount and physical device include: PIn, 1And An(n≤N, N=20).PDM-QPSK-WDM system is selected in scheme, WDM there are 80 letters
Road, channel spacing 50GHz, signal bandwidth 30GHz.
Optimization process:
By abovementioned steps 1, the link configuration of optical fiber is actively obtained according to network management database, parameter includes that optical path is respectively transmitted
The delivery fiber dispersion coefficient D=20ps/nm/km of span, attenuation alpha=0.2dB/km, nonlinear coefficient γ=1.3681 × 10-3/ W/m, adjustable amplifier gain As,nRespectively 24,6,6,14,10,10,14,8,14,20,10,20,6,12,6,10,6,8,
8,10 (dB).In transmitter and amplifier allowed band, transmitter power traverses range and chooses [- 10,10] (dBm), uses
Q when assessment formula shown in formula (1) calculates corresponding receiving end Q factor maximumopt=19.0635dB and its corresponding chain
The optimal launched power P of road allocation optimum value first segment optical fiberopt=1.42dBm, amplifier gain AOpt, nIt is respectively as follows: 17.92,
6,8.75,12.65,10,11.35,11.97,10.03,16,16.65,13.35,15.25,8.08,9.92,7.4,8.6,
6.72,8,8.68,10 (dB), as shown in table 1.Q is setref=18.4717dB is (in the optical communication system equipment for having control function
In, QrefIt can be arranged by control plane or network management).
It is Mea=mABS (Δ A according to module by abovementioned steps 2n)-tn, it is equal that m, t variation range are set
For [0.1:0.01:1], indicate that constant interval is [0.1,1], step-length 0.01.
By abovementioned steps 3~5, in m, when t changes, statistics Q factor is greater than QrefThe image intensifer configuration adjustment of Shi Suoxu
Number obtains having the smallest adjusting number (K in m=1, t=0.3min=2), wherein the amplifier span position for needing to adjust
Set respectively M1=1, M2=3 (A shown in Fig. 31And A3), corresponding Mea value is respectively 5.78 and 1.85, such as the most right column institute of table 1
Show.At this point, by by A1And A3Adjust separately AOpt, 1And AOpt, 3, obtaining Q factor is 18.5698dB, is greater than Qref=
18.4717dB optimization terminates.
Finally, the regulated quantity that optimization is completed can be by under network management plane (or control plane) and the interface of transport plane
It is dealt into each node and implements dynamic regulation.When the device for realizing transmission performance assessment is located at control plane, (PCE or distributed AC servo system are flat
Face node), the information of the amplifier gain can be transmitted between each control plane node by signaling protocol, and pass through
Plane node and transport plane node interface are controlled, each node will be reached under regulated quantity and implements dynamic regulation, is realized to link
Optimization, and newest configuration parameter is stored in network management or the database of control plane.
Table 1, amplifier initial value and optimum results (when K=2, Q > Qref)
It can be seen that the conclusion of the second suboptimization meets judgment condition from upper table, for the Configuration Values for returning to network management, only to the
One and second variable be adjusted.Certainly, there are also other a variety of situations for initial configuration in example, for receiving end signal quality
Difference, transmission performance need the optical fiber link that further increases, the present invention can in the case where regulating allocation amount as few as possible,
The effectively and efficiently transmission performance of optimization system.The optimization algorithm chooses the balance of two factors of number and transmission performance of adjusting
State, realizes the optimization to system configuration, and use image intensifer as few as possible adjusts number, reaches transporting as excellent as possible
Energy.
This programme is suitable for the related detection system situation of the irregular link of multi-span of long range, non-dispersive compensation.Its
Metric considers regulated quantity and adjusts two targets of node number, in addition to the example that the two provided in this patent is subtracted each other, degree
Magnitude MeaIt can also be comprising regulated quantity and adjust other combining forms of node number, to effectively reduce required for optimization link
The modulator number of adjusting.
Claims (6)
1. a kind of long range coherent optical communication system transmission performance optimization method, which is characterized in that comprise the steps of:
Step 1 is joined based on each span decaying of link and amplifier noise characteristic, the optimal performance for calculating entire optical communication link
Number, including optimal launched power Popt, optimal amplifier gain Aopt,n, then obtain optimal difference ABS (the Δ A of amplifier gainn)
=| Aopt,n-As,n|, wherein Δ AnIt is the difference between optimal amplifier gain and amplifier gain initial value；
Step 2, the range and initial value for setting one group of weighting coefficient m, t；
Step 3 considers that the optimal difference of the amplifier gain and two factors of amplifier span position n, setting module are
Mea=mABS (Δ An)-tn, according to the m of hypothesis, t value calculates Mea；Corresponding K >=1 amplification when selecting Mea larger
Device span position n=M1,…,MK, corresponding amplifier gain is set to Aopt,M1,…,Aopt,MK, other amplifier spans
Position n=1~N, and n ≠ M1,…,MKCorresponding amplifier gain is its initial value As,n, make system Q > Qref, wherein Q is to be
System mass parameter, QrefGuarantee index value required by reliable transmission for preset one；
Step 4 changes the weighting coefficient m in predetermined range, and the value of t re-execute the steps 3；Described add is varied multiple times
The value of weight coefficient then obtains one group of data K through step 3；
Value K when step 5, selection K minimummin, corresponding weighting coefficient values mmin、tmin, it is K that amplifier, which adjusts number, at this timemin
A, obtaining corresponding amplifier gain according to step 3 result is respectively Aopt,Mk, wherein k=1~Kmin；In step 3~4,
Launched power uses the optimal launched power Popt。
2. long range coherent optical communication system transmission performance optimization method as described in claim 1, which is characterized in that also comprising with
Lower step:
To K in linkminThe gain of a amplifier is adjusted, and makes corresponding amplifier gain from its initial value As,MkIt is adjusted to
Aopt,Mk。
3. long range coherent optical communication system transmission performance optimization method as described in claim 1, which is characterized in that calculate Q value
Method be applicable in optical signal to noise ratio cascaded computation, i.e. Q=SNRRx, have
Wherein, SNRnFor n-th of span signal-to-noise ratio.
4. long range coherent optical communication system transmission performance optimization method as claimed in claim 3, which is characterized in that
Wherein, LnFor the length of each span of n=1~N, PIn, nFor the incident optical signal power of n-th of span, PASE,nFor amplifier
Spontaneous emission noise power, PNLI, nFor nonlinear noise power, AnFor the gain of amplifier.
5. the long range coherent optical communication system transmission performance optimization method as described in Claims 1 to 4 is any, which is characterized in that
Be arranged the weighting coefficient m variation range be [δ, 1], wherein δ be one close to 0 positive number.
6. the long range coherent optical communication system transmission performance optimization method as described in Claims 1 to 4 is any, which is characterized in that
Be arranged the weighting coefficient t variation range be [δ, 1], wherein δ be one close to 0 positive number.
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| CN101808257A (en) * | 2010-02-26 | 2010-08-18 | 北京邮电大学 | Method and device for optimizing dynamic transmission performance in wavelength switched optical network |
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