CN101013922A - Regulation method for updating amplification unit of fiber communication system - Google Patents

Abstract

The invention relates to one fiber communication system amplifier unit update adjust method in fiber communication technique, which comprises the following steps: a, adding at least one pump power; b, testing updated output signal light power gain spectrum by micro particle group formula to adjust the results into pump light.

Description

Regulation method for updating amplification unit of fiber communication system

Technical field

The present invention relates to Fibre Optical Communication Technology.

Background technology

Growth at full speed along with based on network various information services, people improve constantly the requirement of message capacity, in order constantly to adapt to new capacity requirement, increasing the wavelength number (increasing to the C+L wave band as C-band) of flashlight and/or reduce the interval (upgrading to dense wave division multipurpose as Coarse Wavelength Division Multiplexing) of channel on the existing fiber communications network system, is economy, the effective means that improves the optical fiber telecommunications system capacity.Because the flashlight number after the upgrading increases, cause the situation after amplification unit of fiber communication system can not adaptation signal light increases, the gain spectral mis-behave has produced very big harmful effect to the communication system quality.

In the middle of optical fiber, because factors such as stimulated Raman scattering (SRS) interactions, amplified spont-aneous emission (ASE) noise, Rayleigh and pair Rayleigh scatterings (DRS) between pumping and the pumping, between pumping and the flashlight, between flashlight and the flashlight, optical fiber attenuation, make that the light wave environment in the amplifier is very complicated. for example, the mathematical modulo of forward pumping RFA can be expressed by following formula under more complete stable state:

$\frac{{\mathrm{dP}}_f(z,v)}{\mathrm{dz}}=-\mathrm{\α}\left(v\right)P_f(z,v)+\mathrm{\γ}\left(v\right)P_b(z,v)$

$+{\∫}_{\mathrm{\ζ}>v}\left\{\frac{g_r}{A_{\mathrm{eff}}}(v-\mathrm{\ζ})\right[P_f(z,\mathrm{\ζ})+P_b(z,\mathrm{\ζ})]P_f(z,v)+2\mathrm{hv}\frac{g_r}{A_{\mathrm{eff}}}(v-\mathrm{\ζ})[P_f(z,\mathrm{\ζ})+P_b(z,\mathrm{\ζ})[1+\frac{1}{e^{h(\mathrm{\ζ}-v)/\mathrm{kT}}-1}]\}\mathrm{d\ζ}$

$-{\&Integral;}_{\mathrm{\&zeta;}<v}\left\{\frac{g_r}{A_{\mathrm{eff}}}(v-\mathrm{\&zeta;})\right[P_f(z,\mathrm{\&zeta;})+P_b(z,\mathrm{\&zeta;})]P_f(z,v)+2\mathrm{hv}\frac{g_r}{A_{\mathrm{eff}}}(v-\mathrm{\&zeta;})[P_f(z,\mathrm{\&zeta;})+P_b(z,\mathrm{\&zeta;})[1+\frac{1}{e^{h(\mathrm{\&zeta;}-v)/\mathrm{kT}}-1}]\}\mathrm{d\&zeta;}$

P wherein _f(z, v) and p _b(z v) is respectively that frequency is the light path forward direction of v and the luminous power of backpropagation, α (v), γ (v), A _EffAnd g _r(v-ζ) is respectively the Raman gain coefficienct of loss factor, rayleigh scattering coefficient, effective core area and the optical fiber of optical fiber, and ζ, k, h, T and dz are respectively the differential length units of frequency of light wave, Boltzmann constant, Planck's constant, temperature and optical fiber.The mathematical modulo of backward pumping RFA is similar with (1) formula, mainly is the difference on the sign symbol, and the mathematical modulo of two directional pump is as long as combine the model of forward and reverse pumping.

From following formula as seen, during main effects in only considering the above-mentioned RFA that mentions, the RFA that is used in the dwdm system has just constituted very complicated high dimensional nonlinear system, if pumping and signal all have the power and the wavelength two-dimensional adjustment degree of freedom, then the variable dimension of whole system just equals flashlight and pump light sum two times, if add the degree of freedom that the various attribute of optical fiber is produced, then the dimension of system is just higher.In practical design with in using, the general just parameter of pumping of regulating, however, because the height of system is non-linear, especially under the condition of reverse and two directional pump, owing to there is the light path of forward and reverse transfer simultaneously, just require very high space complexity and time complexity when finding the solution following formula, make to obtain and satisfy that the pairing pump power of gain spectrum flattening and wavelength are very things of difficulty in certain bandwidth, even if it is also quite time-consuming only to adjust the luminous power of upgrading each road pumping later, influence the normal operation of communication network.

Summary of the invention

Technical problem to be solved by this invention is, a kind of regulation method for updating of optical fiber communication amplification system is provided, can the flashlight number and (or) under the power situation about increasing, by increase pumping source and (or) pumping source is adjusted adaptively, make amplifying unit satisfy the requirement of new system.

The technical scheme that the present invention solve the technical problem employing is that the optical fiber telecommunications system regulation method for updating is characterized in that, may further comprise the steps:

1) increases at least one pumping source;

2) detect the optical power gain spectrum of the output end signal light after upgrading, and, adjust pump light according to result of calculation with particle swarm optimization calculating.

Specifically, calculate according to following formula:

Tp _id(k)＝Random(0，c ₁)[P _id(k)-x _id(k)]

Tq _id(k)＝Random(0，c ₂)[q _gd(k)-x _id(k)]

v _id(k+1)＝wv _id(k)+Tp _id(k)+Tq _id(k)

x _id(k+1)＝x _id(k)+v _id(k+1)

V _dmin≤v _id(k)≤V _dmax

X _dmax≤x _id(k)≤X _dmax

The invention has the beneficial effects as follows, can only be optimized adjustment as parameter to the communication system gain spectral of upgrading according to gain spectral, need not to consider the influence of other factors, make amplifying unit can adapt to new system, after having solved increase flashlight way, the adaptability problem of system's amplifying unit has intelligence, advantage efficiently.

The present invention is further illustrated below in conjunction with the drawings and specific embodiments.

Description of drawings

Fig. 1 is a method flow schematic diagram of the present invention.

Fig. 2 is the amplification system schematic diagram of backward pumping.

Fig. 3 is the amplification system schematic diagram of forward pumping.

Fig. 4 is the amplification system schematic diagram of two directional pump.

Fig. 5 is an algorithm flow chart of the present invention.

Fig. 6 is a gain spectral schematic diagram of the present invention.

Embodiment

In optical fiber telecommunications system, because the continuous growth of message capacity demand often needs more flashlight way, solution of the present invention is to adopt the mode that increases pumping source, simultaneously the amplifying unit behind the increase pumping source is carried out intelligence adjustment.

Specifically, optical fiber telecommunications system regulation method for updating of the present invention may further comprise the steps:

1) increases at least one pumping source;

2) detect the optical power gain spectrum of the output end signal light after upgrading, and, adjust pump light according to result of calculation with following formula calculating:

Tp _id(k)＝Random(0，c ₁)[p _id(k)-x _id(k)]

Tq _id(k)＝Random(0，c ₂)[q _gd(k)-x _id(k)]

v _id(k+1)＝wv _id(k)+Tp _id(k)+Tq _id(k)

x _id(k+1)＝x _id(k)+v _id(k+1)

V _dmin≤v _id(k)≤V _dmax (1)

X _dmax≤x _id(k)≤X _dmax

The present invention detects the gain spectral of upgrading amplifier output signal behind system upgrade, calculate Δ G _Max, and judge the gain spectral state, and adjust if desired, then handle, and control each pumping light power P according to result according to formula (1) ₁, P ₂P _nFormula (1) belongs to particle swarm optimization, is called intelligent optimization algorithm among Fig. 1.After the adjustment, continue,,, then continue to adjust if do not make it if make it then stop adjustment to pumping source to monitor signal output.Flow chart is seen Fig. 1.

Parameter interpretation: the flow chart of algorithm is seen Fig. 5.Suppose to form a group by m particle in the target search space of a D dimension, wherein i particle position can be expressed as the vector that a D ties up, x _i=(x _I1, x _I2..., x _ID), i=1,2 ..., m, x _iPotential separating of the problem of asking exactly.With x _iBring a target function into and just can calculate its adaptive value, weigh x according to the size of adaptive value _iQuality." circling in the air " speed of i particle also is a D dimensional vector, is designated as v _i(v _I1, v _I2... v _ID).Remember that the optimal location that i particle searches up to now is p _i=(p _I1, p _I2, p _ID), the optimal location that whole population searches up to now is p _g=(p _G1, p _G2, p _GD), wherein, d=1,2 ... D, w are non-negative constants, are called inertial factor, c ₁, c ₂Be non-negative constant, be called the study factor, Random is a random function, and k is an iterations.For preventing particle away from the search volume, each dimension speed v of particle _IdAlso to be clamped at [v _Dmax, v _Dmax] between, if the bounded problem also has following constraints, x _Id∈ [x _Dmin, x _Dmax], v _DmaxBe predefined constant, x _DminAnd x _DmaxFor the boundary value of the domain of definition, work as v _IdOr (with) x _IdWhen exceeding predetermined border, v _IdOr (with) x _IdJust equal its corresponding edge dividing value.

In the formula, p _IdFor single particulate is obtained minimum delta G _MaxThe time x _Id, q _GdFor all particulates are obtained minimum delta G _MaxThe time x _Id, v is the power variation vector, x is a power vector.Δ G _MaxBe the maximum difference in the gain spectral and between the target gain.In Fig. 6, the target gain spectral curve is a, and the actual gain spectral curve is b, and maximum difference is Δ G _Max

Before formula be an instantiation of particle swarm optimization, the various variants of other particle swarm optimization may be in expression and different in form, but still belongs in the claim scope of the present invention.

As different embodiment, the present invention can increase forward pumping source, counter-directional pump source or two-way simultaneous and increase pumping source on the basis of former amplifying unit, referring to Fig. 2-4.C1, C2 are circulator among the figure, and 23,33,43 is optical fiber, and PC is the pumping wave multiplexer, and 21,22,31,32,41,42 is ISO, i.e. optical isolator, and 34,44,45 is optical coupler.Pumping source for increasing in the frame of broken lines among the figure.The pumping source number that no matter increases newly how much, all can adopt the present invention to be adjusted.

Claims (5)

1, regulation method for updating amplification unit of fiber communication system is characterized in that, may further comprise the steps:

1) increases at least one pumping source;

2) detect the optical power gain spectrum of the output end signal light after upgrading, and, adjust pump light according to result of calculation with particle swarm optimization calculating.

2, regulation method for updating amplification unit of fiber communication system as claimed in claim 1 is characterized in that, described particle swarm optimization is:

Tp _id(k)＝Random(0，c ₁)[p _id(k)-x _id(k)]

Tq _id(k)＝Random(0，c ₂)[q _gd(k)-x _id(k)]

v _id(k+1)＝wv _id(k)+Tp _id(k)+Tq _id(k)

x _id(k+1)＝x _id(k)+v _id(k+1)

V _dmin≤v _id(k)≤V _dmax

X _dmax≤x _id(k)≤X _dmax。

3, regulation method for updating amplification unit of fiber communication system as claimed in claim 1 is characterized in that, described upgrading to increases the forward pumping source.

4, regulation method for updating amplification unit of fiber communication system as claimed in claim 1 is characterized in that, the described increase counter-directional pump source that upgrades to.

5, regulation method for updating amplification unit of fiber communication system as claimed in claim 1 is characterized in that, described upgrading to increases forward pumping source and counter-directional pump source.

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