CN102130719B - Method and device for estimating power of output light with various wavelengths of amplifier - Google Patents

Abstract

The invention relates to the field of communication transmission, in particular to a method and device for estimating power of output light with various wavelengths of an amplifier. The method can be applied to the process of estimating the output light power of links, and comprises the following steps: acquiring power of input light with various wavelengths of the amplifier, reference gain spectrum of the amplifier, working mode parameters of the amplifier and physical parameters of the amplifier; calculating actual grain spectrum of the amplifier in accordance with the power of input light with various wavelengths of the amplifier, the reference gain spectrum of the amplifier, the working mode parameters of the amplifier and the physical parameters of the amplifier; and calculating power of output light with various wavelengths of the amplifier in accordance with the power of input light with various wavelengths of the amplifier and the actual gain spectrum of the amplifier. The scheme provided by the embodiment of the invention can be used to greatly shorten the time required for estimating the power of output light with various wavelengths of the amplifier, and decrease logical resources which are occupied in the estimation process.

Description

A kind of method and apparatus of estimating each wavelength Output optical power of amplifier

Technical field

The present invention relates to optical communication transmission field, relate in particular to a kind of method and apparatus of estimating each wavelength Output optical power of amplifier.

Background technology

Along with developing rapidly of Fibre Optical Communication Technology, the realization of dense wavelength division multiplexing technology (DWDM) and erbium-doped fiber amplifier (EDFA) has improved capacity and the transmission range of optical fiber telecommunications system greatly.Typical DWDM+EDFA optical fiber telecommunications system as shown in Figure 1, light at source different wave length optical sender is coupled to transmission in same optical fiber through wave multiplexer (MUX), attenuation characteristic due to optical fiber itself, after transmitting a segment distance, need to amplify luminous power with EDFA, in egress, first use a channel-splitting filter by the light signal demultiplexing of different wave length out, the receiver of delivering to respectively separately carries out follow-up processing.

Therefore due to current EDFA bandwidth of operation, can accomplish very widely, can realize the effect that a plurality of wavelength signals of input are amplified simultaneously.But, because the gain spectral of EDFA is often uneven, as shown in Figure 2, cause EDFA in link can only guarantee total gain (being operated in automatic gain locking mode corresponding to EDFA) or total Output optical power (being operated in automated power locking mode corresponding to EDFA) constant, therefore after a plurality of EDFA cascades, between each wavelength, power difference is larger, if can accurately obtain the luminous power of each wavelength after multistage EDFA cascade, for link performance assessment and light power equalization, will play very important effect.

Article one, in link, may comprise one or more levels EDFA, the output of every grade of EDFA is next coupled input across section optical fiber, therefore in Output optical power (Output optical power of egress in Fig. 1) process of a link of estimation, how to estimate that the Output optical power of every grade of EDFA becomes key.

Prior art, in a link Output optical power process of estimation, generally adopts Giles-Emmanuel model to calculate each wavelength Output optical power of every grade of EDFA.Giles-Emmanuel model is a kind of simplified model of considering erbium ion energy level rate equation that Giles and Emmanuel propose, and according to the method for equivalent noise, considers that bandwidth is Δ v _k(frequency interval of calculating noise power), centre wavelength is λ _k=c/v _kk light beam in erbium optical fiber, propagate, further consider after background loss that the energy level transition rate equation by erbium ion can draw:

Wherein

$\frac{{\stackrel{\‾}{n}}_2}{{\stackrel{\‾}{n}}_t}=\frac{\underset{k}{\mathrm{\Σ}}\frac{(P_k^{+}\left(z\right)+P_k^{-}\left(z\right)){\mathrm{\α}}_k}{h{v}_k\mathrm{\ζ}}}{1+\underset{k}{\mathrm{\Σ}}\frac{(P_k^{+}\left(z\right)+P_k^{-}\left(z\right))({\mathrm{\α}}_k+g_k^{*})}{h{v}_k\mathrm{\ζ}}}---\left(2\right),$

(2) in formula with be respectively bandwidth deltaf v _kthe interior luminous power along fl transmission and backward transmission; K represents the light of different wave length, the overall average population that represents ground state and two energy levels; the population that represents two energy levels; α, g ^*, l, ζ represent respectively absorption coefficient, emission ratio, Intrinsic Gettering coefficient, the parameter of saturation of Er-doped fiber, the m=2 in formula (1) represents two orthogonal polarisation state of spontaneous radiation.

But, there is following shortcoming in the method for estimating each wavelength Output optical power of amplifier in above-mentioned prior art: when calculating each wavelength Output optical power of EDFA, not only need to know the size of pumping light power, but also need to know that the mode of pumping is forward pumping or backward pumping; The method of above-mentioned existing each wavelength Output optical power of estimation EDFA can not obtain analytic solutions, can only obtain numerical solution, therefore when carrying out the above-mentioned equation group of numerical solution, need complicated algorithm, cause the process of calculating very long, consuming time more, take more logical resource.

Summary of the invention

In view of the shortcoming existing in prior art, the embodiment of the present invention provides a kind of method and apparatus of estimating each wavelength Output optical power of amplifier, can greatly shorten required time and the shared logical resource of minimizing of each wavelength Output optical power of estimation amplifier.

The embodiment of the present invention provides a kind of method of estimating each wavelength Output optical power of amplifier, and described method comprises:

Obtain the reference gain spectrum of each wavelength input optical power of described amplifier, described amplifier, the mode of operation parameter of described amplifier and the physical parameter of described amplifier;

According to the reference gain spectrum of each wavelength input optical power of described amplifier, described amplifier, the mode of operation parameter of described amplifier and the physical parameter of described amplifier, calculate the actual gain spectrum of described amplifier;

According to the actual gain spectrum of each wavelength input optical power of described amplifier and described amplifier, calculate each wavelength Output optical power of described amplifier.

The embodiment of the present invention also provides a kind of device of estimating each wavelength Output optical power of amplifier, and described device comprises:

Acquisition module, for obtaining the reference gain spectrum of each wavelength input optical power of described amplifier, described amplifier, the mode of operation parameter of described amplifier and the physical parameter of described amplifier;

The first computing module, for each wavelength input optical power of described amplifier of obtaining according to described acquisition module,, the reference gain of described amplifier spectrum, the mode of operation parameter of described amplifier and the physical parameter of described amplifier, calculate the actual gain spectrum of described amplifier;

The second computing module, for each wavelength input optical power of described amplifier and the actual gain spectrum of the described amplifier that described the first computing module obtains obtaining according to described acquisition module, calculates each wavelength Output optical power of described amplifier.

Than utilize in prior art Giles-Emmanuel model carry out numerical solution EDFA Output optical power method, the embodiment of the present invention is in the process of each wavelength Output optical power of estimation amplifier, owing to utilizing the reference gain spectrum of amplifier, and the mode of operation parameter of combining amplifier and the physical parameter of amplifier, without the actual gain spectrum of carrying out numerical solution and just can rapid solving go out amplifier, then based on this actual gain, compose the Output optical power that can calculate amplifier, thereby also just greatly shortened the required time of each wavelength Output optical power of estimation amplifier.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below the accompanying drawing of required use in embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the schematic diagram of DWDM+EDFA optical fiber telecommunications system;

Fig. 2 is the gain spectral schematic diagram of EDFA;

The schematic flow sheet of the method for a kind of each wavelength Output optical power of estimating amplifier that Fig. 3 provides for the embodiment of the present invention;

The structural representation of the device of a kind of each wavelength Output optical power of estimating amplifier that Fig. 4 provides for the embodiment of the present invention;

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making all other embodiment that obtain under creationary prerequisite, belong to the scope of protection of the invention.

The embodiment of the present invention provides a kind of method of estimating link Output optical power, shown in Figure 3, and described method comprises:

Step S1, obtains the reference gain spectrum of each wavelength input optical power of amplifier, described amplifier, the mode of operation parameter of described amplifier and the physical parameter of described amplifier;

Step S2, according to the reference gain spectrum of each wavelength input optical power of described amplifier, described amplifier, the mode of operation parameter of described amplifier and the physical parameter of described amplifier, calculates the actual gain spectrum of described amplifier;

Step S3, according to the actual gain spectrum of each wavelength input optical power of described amplifier and described amplifier, calculates each wavelength Output optical power of described amplifier.

In embodiments of the present invention, obtain after the actual gain spectrum of amplifier, just can obtain accordingly the optical power gain of each wavelength after this amplifier amplifies, each wavelength input optical power of amplifier in is added to each self-corresponding optical power gain just can obtain each wavelength in the luminous power of amplifier out, i.e. each wavelength Output optical power of amplifier.It should be noted that, if no special instructions, the unit of the optical power gain that in gain spectral in the embodiment of the present invention (comprising reference gain spectrum, offset gain spectrum and actual gain spectrum), each wavelength is corresponding is all dB.

In embodiments of the present invention, step S2 specifically can comprise:

According to the reference gain spectrum of each wavelength input optical power of described amplifier, described amplifier, the mode of operation parameter of described amplifier and the physical parameter of described amplifier, calculate the actual gain spectrum of described amplifier with respect to the offset gain spectrum of reference gain spectrum;

Described offset gain spectrum and described reference gain spectrum are added, obtain the actual gain spectrum of described amplifier.

In the process of estimating at each wavelength Output optical power of the link in network, the scheme that specifically can also apply the embodiment of the present invention provides is estimated each wavelength Output optical power of the amplifiers at different levels in link one by one, then according to each wavelength Output optical power of afterbody amplifier, estimates each wavelength Output optical power of described link.

In actual network,, the optical fiber between interconnective optical fiber, first order amplifier and link source end between at least one grade of amplifier of chain route, amplifier at different levels, and the composition between afterbody amplifier and link egress, typical link as shown in Figure 1 source to the link of egress.In embodiments of the present invention, the optical fiber between the optical fiber between adjacent dual-stage amplifier, link source end and first order amplifier and the optical fiber between afterbody amplifier and egress, be all referred to as across section optical fiber.The output of every one-level amplifier is next input across section optical fiber being connected with its output, therefore, in embodiments of the present invention by calculating the output of first order amplifier, the output of this first order amplifier is the input across section optical fiber as next, then calculate the output of second level amplifier, until calculate the output of afterbody amplifier, finally just can calculate each wavelength light power (being the Output optical power of link) in link egress according to the output of afterbody amplifier.Wherein, adopt existing method calculating link each wavelength light power in egress according to the output of afterbody amplifier, as: each wavelength Output optical power of afterbody amplifier is deducted to last across the loss of section optical fiber (being the optical fiber between afterbody amplifier and egress), just can obtain the luminous power of each wavelength of egress place.

When the scheme that the embodiment of the present invention is provided is applied in each wavelength Output optical power of a link of estimation, obtain each wavelength input optical power of described amplifier, specifically can comprise:

Obtain each wavelength input optical power and loss across section optical fiber of being connected with described amplifier in; Wherein, when described amplifier is first order amplifier, first each wavelength input optical power across section optical fiber (being that link source end and the first order are across the optical fiber between section optical fiber) is exactly that each wavelength is in the luminous power at link source end place, when described amplifier is not first order amplifier, each wavelength Output optical power that each wavelength input optical power across section optical fiber being connected with described amplifier in is exactly upper level amplifier;

According to each wavelength input optical power and loss across section optical fiber of being connected with described amplifier in, calculate each wavelength input optical power of described amplifier; Wherein, each wavelength input optical power across section optical fiber being connected with described amplifier in deducts this across the loss of section optical fiber, just can obtain each wavelength at this luminous power across section fiber-optic output, i.e. each wavelength input optical power of described amplifier.

In the embodiment of the present invention, the reference gain of amplifier spectrum is the described amplifier that records the in advance gain spectral under full ripple input.What amplifier generally had a regulation can input the number of wavelengths of amplifying at most simultaneously, and when the wavelength of these maximum numbers of input is during to amplifier, the full ripple that is just referred to as amplifier is inputted.

In actual applications, amplifier generally has two kinds of mode of operations: automatic gain locking mode and automated power locking mode.When amplifier is operated under automatic gain locking mode, the overall gain of amplifier (the gain sum of each wavelength) is exactly constant; When amplifier is operated under automated power locking mode, the output gross power of amplifier (the luminous power sum of each wavelength of amplifier output) is exactly constant.The mode of operation parameter of the amplifier in the embodiment of the present invention comprises the overall gain of amplifier or total Output optical power of amplifier.

Amplifier in the embodiment of the present invention in system as shown in fig. 1, use EDFA time, the physical parameter of amplifier can comprise the fine parameter of erbium.It should be noted that, the present invention does not limit amplifier, except can also be other amplifier for EDFA, as: raman amplifier, semiconductor amplifier etc.

Optical fiber telecommunications system below in conjunction with the DWDM+EDFA shown in Fig. 1, the method of each wavelength Output optical power of the estimation amplifier that inventive embodiments is mentioned and the process of estimating on its basis each wavelength Output optical power of link, be further described.

A link from source to egress has been described, by N level EDFA (EDFA1, EDFA2...EDFAN) with (N+1) individually form across section optical fiber in Fig. 1.For convenience of description, by (N+1) individual across section optical fiber the direction from source to egress be referred to as successively first across section optical fiber (optical fiber between source and EDFA1), second across section optical fiber ... N+1 is across section optical fiber (optical fiber between EDFAN and egress).

Source shown in estimation Fig. 1 is as follows to the process of the Output optical power of egress link: first obtain each wavelength Output optical power with the first EDFA1 being connected across section fiber-optic output, and then using each wavelength Output optical power of this EDFA1 as the second input optical power across section optical fiber, and then obtain each wavelength Output optical power of EDFA2, by this mode of calculating one by one, finally calculate each wavelength Output optical power of EDFAN, then the loss across section optical fiber according to each wavelength Output optical power of EDFAN and N+1, calculate the luminous power at each wavelength of egress place, it is each wavelength Output optical power of link.

The method of each wavelength Output optical power of calculating every one-level EDFA is all identical, only take below calculate EDFA1 each wavelength Output optical power as example is described, comprising:

According in first each wavelength input optical power across the section optical fiber luminous power of each wavelength of source place () and the first loss across section optical fiber, just can obtain at first each wavelength Output optical power across section optical fiber, because first is connected with EDFA1 input across section optical fiber, this first each wavelength Output optical power across section optical fiber is each wavelength input optical power of EDFA1 namely;

Obtain the fine parameter of erbium of reference gain spectrum, mode of operation parameter and the EDFA1 of EDFA1; Wherein, the fine parameter of the erbium of EDFA1 comprises: the concentration of erbium ion in the length of Er-doped fiber, Er-doped fiber, the emission ratio that each wavelength is corresponding, the absorption coefficient that each wavelength is corresponding etc.

According to the fine parameter of erbium of each wavelength input optical power of EDFA1, reference gain spectrum, mode of operation parameter and EDFA1, calculate the actual gain spectrum of EDFA1 with respect to the offset gain spectrum of reference gain spectrum;

The reference gain spectrum of above-mentioned reference gain spectrum and above-mentioned EDFA1 is added, obtains the actual gain spectrum of EDFA1;

According to the actual gain spectrum of each wavelength input optical power of EDFA1 and EDFA1, calculate each wavelength Output optical power of EDFA1.Wherein, calculate each wavelength Output optical power of EDFA1, be specifically as follows: according to the actual gain spectrum of EDFA1, obtain the optical power gain that each wavelength produces after EDFA1, then each wavelength input optical power of EDFA1 is added to the optical power gain producing after EDFA1 separately, just obtain each wavelength Output optical power of EDFA1.

To calculating process and the principle of the offset gain spectrum of EDFA, do brief description below:

Generally, the gain spectral of any EDFA can be described by (3) formula:

$g\left({\mathrm{\λ}}_k\right)=\exp \left\{\right[(g_k^{*}+{\mathrm{\α}}_k)\frac{{\stackrel{\‾}{n}}_2}{n_t}-{\mathrm{\α}}_k\left]L\right\}---\left(3\right)$

L is the length of the Er-doped fiber of EDFA, λ _kmean K wavelength, for erbium ion is at the metastable density that is evenly distributed, n _tfor erbium ion concentration, be K the emission ratio (or gain coefficient) that wavelength is corresponding, α _kbe K the absorption coefficient that wavelength is corresponding.

G (λ _k) unit be linear unit, (3) formula is converted to dB form, can be expressed as:

$G\left({\mathrm{\λ}}_k\right)=10\mathrm{lo}{g}_{10}e\·\left\{\right[(g_k^{*}+{\mathrm{\α}}_k)\frac{{\stackrel{\‾}{n}}_2}{n_t}-{\mathrm{\α}}_k\left]L\right\}---\left(4\right)$

The in the situation that of full ripple input, the gain spectral of EDFA is G ₀(λ _k), this gain spectral is as with reference to gain spectral.The actual gain spectrum of the lower EDFA of input is G arbitrarily ₁(λ _k), this is the actual gain spectrum G of the lower EDFA of input arbitrarily ₁(λ _k) with respect to reference gain spectrum G ₀(λ _k) offset gain spectrum be Δ G (λ _k), can be expressed as:

$G_1\left({\mathrm{\λ}}_k\right)-G_0\left({\mathrm{\λ}}_k\right)=\mathrm{\ΔG}\left({\mathrm{\λ}}_k\right)=10\mathrm{lo}{g}_{10}e\·(g_k^{*}+{\mathrm{\α}}_k)L\frac{\mathrm{\Δ}{\stackrel{\‾}{n}}_2}{n_t}---\left(5\right)$

Wherein, be illustrated under any input in Er-doped fiber erbium ion metastable be evenly distributed density with respect to Er-doped fiber under full ripple input in erbium ion at the metastable variable quantity that is evenly distributed density.

Because manufacturer all can provide when producing EDFA α _k, n _t, the fine parameter of these erbiums such as L, reference gain spectrum G ₀(λ _k) can obtain by actual measurement in advance, only have be unknown, need to solve calculating by other restriction relation, solve process as follows:

If A EDFA is operated under automatic gain control model, have relational expression (6) to set up:

$\underset{k}{\mathrm{\Σ}}{P}_{\mathrm{in}}\left({\mathrm{\λ}}_k\right)\·10^{G_1\left({\mathrm{\λ}}_k\right)/10}=\stackrel{\‾}{G}\underset{k}{\mathrm{\Σ}}{P}_{\mathrm{in}}\left({\mathrm{\λ}}_k\right)---\left(6\right)$

Wherein, P _in(λ _k) for being input to k the input optical power that wavelength is corresponding of EDFA, overall gain (unit is dB) for EDFA.According to (5), (6) formula, just can solve

If B EDFA is operated in automated power control model, have relational expression (7) to set up:

$\underset{k}{\mathrm{\Σ}}{P}_{\mathrm{in}}\left({\mathrm{\λ}}_k\right)\·{10}^{G_1\left({\mathrm{\λ}}_k\right)/10}={\stackrel{\‾}{P}}_{\mathrm{out}}---\left(7\right)$

Wherein, total Output optical power for EDFA.According to (5), (7) formula, just can solve

By what solve above substitution (5) formula, has obtained offset gain spectrum Δ G (λ _k).

In embodiments of the present invention, according to each wavelength input optical power of the EDFA obtaining, mode of operation parameter, the fine parameter of erbium and reference gain spectrum, just can obtain the offset gain spectrum of EDFA, then the offset gain spectrum of EDFA and its reference gain spectrum are added, can obtain the actual gain spectrum of EDFA.

It should be noted that, an EDFA may consist of multistage Er-doped fiber, for every section of Er-doped fiber (5) formula, all uses, and therefore, every section of Er-doped fiber has corresponding one when solving the offset gain spectrum that comprises multistage Er-doped fiber EDFA, can this all multistage Er-doped fiber is corresponding be used as an integral body and see, equivalence becomes one then this equivalence one-tenth in substitution formula (6) or (7), to obtain accordingly the offset gain spectrum of whole EDFA.

In embodiments of the present invention, by composing by means of the reference gain obtaining in advance, some physical parameters, the mode of operation parameter of while combining amplifier, can solve offset gain spectrum, be amplified accordingly the actual gain spectrum of device, in asking for the actual gain spectrum process of amplifier, without carrying out numerical solution, greatly saved the logical resource of device, but also greatly dwindled the required time of each wavelength Output optical power of estimation amplifier.In the process of the network capacity extension or wavelength heavy-route, often need to estimate in advance the Output optical power of one or more wavelength after a link, to evaluate out this link, whether meet the requirement of the network capacity extension or heavy-route, after the scheme that the employing embodiment of the present invention provides, owing to estimating that the time of the Output optical power of amplifier is greatly shortened, thereby the time of estimating the Output optical power of whole link is also greatly shortened, so also just can be rapidly newly-built or rebuild a business.From principle explanation above, it can also be seen that, the scheme that the embodiment of the present invention provides does not need to obtain watt level and the pump mode of the pump light of amplifier.

The method of each wavelength Output optical power of the estimation amplifier providing based on the embodiment of the present invention, correspondingly, the embodiment of the present invention also provides a kind of device of carrying out said method.Described device comprises: acquisition module 31, the first computing module 32, the second computing module 33 and the 3rd computing module 34.

Acquisition module 31, for obtaining the reference gain spectrum of each wavelength input optical power of amplifier, described amplifier, the mode of operation parameter of described amplifier and the physical parameter of amplifier.

The first computing module 32, for each wavelength input optical power of described amplifier of obtaining according to acquisition module 31,, the reference gain of described amplifier spectrum, the mode of operation parameter of described amplifier and the physical parameter of described amplifier, calculate the actual gain spectrum of described amplifier.

The second computing module 33, for each wavelength input optical power of described amplifier and the actual gain spectrum of the first computing module 32 acquisitions obtaining according to described acquisition module 31, calculates each wavelength Output optical power of described amplifier.

In one embodiment, the first computing module 32 specifically can comprise: the first calculating sub module 321, be used for each wavelength input optical power of described amplifier obtaining according to described acquisition module 31, the reference gain of described amplifier spectrum, the mode of operation parameter of described amplifier and the physical parameter of described amplifier are calculated the actual gain spectrum of described amplifier with respect to the offset gain spectrum of reference gain spectrum;

The second calculating sub module 322, for the reference gain spectrum addition of the described amplifier that the described offset gain that described the first calculating sub module 321 is calculated is composed and described acquisition module 31 obtains, obtains the actual gain spectrum of described amplifier.

In the present embodiment, relevant description in the detailed process of the actual gain spectrum of the first calculating sub module 321 calculating offset gain spectrums and the second calculating sub module 322 computing amplifiers and the principle reference above relying on is not repeating herein.

In another embodiment, acquisition module 31 specifically can comprise:

Obtain submodule 311, for obtaining each wavelength input optical power and the loss across section optical fiber being connected with described amplifier in;

The 3rd calculating sub module 312, for each wavelength input optical power and the loss across section optical fiber being connected according to described amplifier in, calculates the input optical power of described amplifier.

Device provided by the invention can also be used in the process of each wavelength Output optical power estimation of the link in network, now, the second computing module 33 is also for using each wavelength Output optical power of described amplifier as each wavelength input optical power across section optical fiber being connected with described amplifier out, offer described acquisition module 31, so that device of the present invention continues to estimate each wavelength Output optical power of next stage amplifier accordingly.For example, in the fibre system shown in Fig. 1, the device that the embodiment of the present invention provides has calculated after each wavelength Output optical power of EDFA1, the second computing module 33 offers acquisition module 31 by each wavelength Output optical power of the EDFA1 calculating, so that the device that the embodiment of the present invention provides continues to estimate each wavelength Output optical power of EDFA2 accordingly, each wavelength Output optical power of the estimation amplifier that the device that the embodiment of the present invention provides is mentioned in adopting above calculates one by one, until finally estimate each wavelength Output optical power of EDFAN.

When each wavelength Output optical power of estimation link, the device of each wavelength Output optical power of the estimation amplifier that the embodiment of the present invention provides, can further include:

The 3rd computing module 34, when being the afterbody amplifier of described link when described amplifier, each wavelength Output optical power of the described amplifier obtaining according to described the second computing module 33, calculates each wavelength Output optical power of described link.For example, in optical fiber telecommunications system shown in Fig. 1, when the second computing module has calculated each wavelength Output optical power of EDFAN, the 3rd computing module 34, can also calculate the luminous power at each wavelength of link egress place according to each wavelength Output optical power of EDFAN.Wherein, the detailed process that the 3rd computing module 34 calculates each wavelength Output optical power of link egress, with reference to the associated description in above, repeats no more herein.

It should be noted that, the device of each wavelength Output optical power of the estimation amplifier that the embodiment of the present invention provides can be arranged in network management system.

The device of each wavelength Output optical power of the estimation amplifier that the embodiment of the present invention provides, by composing by means of the reference gain obtaining in advance, some physical parameters, the mode of operation parameter of while combining amplifier, can solve offset gain spectrum, be amplified accordingly the actual gain spectrum of device, in asking for the actual gain spectrum process of amplifier without carrying out numerical solution, greatly saved the logical resource of device, but also greatly dwindled the required time of each wavelength Output optical power of estimation amplifier.In the process of the network capacity extension or wavelength heavy-route, often need to estimate in advance the Output optical power of one or more wavelength after a link, to evaluate out this link, whether meet the requirement of the network capacity extension or heavy-route, after the device that the employing embodiment of the present invention provides, owing to estimating that the time of the Output optical power of amplifier is greatly shortened, thereby the time of estimating the Output optical power of whole link is also greatly shortened, so also just can be rapidly newly-built or rebuild a business.From principle explanation above, it can also be seen that, the device that the embodiment of the present invention provides, when each wavelength Output optical power of estimation amplifier, does not need to obtain watt level and the pump mode of the pump light of amplifier, has a wide range of applications scene.

The above; be only the present invention's embodiment preferably, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.

Claims (6)

1. a method of estimating each wavelength Output optical power of amplifier, is characterized in that, described method comprises:

Obtain the reference gain spectrum of each wavelength input optical power of amplifier, described amplifier, the mode of operation parameter of described amplifier and the physical parameter of described amplifier; The reference gain spectrum of described amplifier is the gain spectral of described amplifier under full ripple input, wherein, described amplifier is specially Erbium-Doped Fiber Amplifier, the physical parameter of described amplifier comprises: the length of Er-doped fiber in amplifier, the concentration of erbium ion, the corresponding emission ratio of each wavelength or gain coefficient, the corresponding absorption coefficient of each wavelength; The mode of operation parameter of described amplifier comprises: automatic gain is controlled the overall gain of lower amplifier, or total Output optical power of amplifier under automated power control model;

According to the reference gain spectrum of each wavelength input optical power of described amplifier, described amplifier, the mode of operation parameter of described amplifier and the physical parameter of described amplifier, calculate the actual gain spectrum of described amplifier with respect to the offset gain spectrum of reference gain spectrum, wherein, calculating described offset gain spectrum specifically comprises:

When amplifier is operated under automatic gain control model, according to formula $G_1\left({\mathrm{\λ}}_k\right)-G_0\left({\mathrm{\λ}}_k\right)=\mathrm{\ΔG}\left({\mathrm{\λ}}_k\right)=10{\log }_{10}e\·(g_k^{*}+{\mathrm{\α}}_k)L\frac{\mathrm{\Δ}{\stackrel{\‾}{n}}_2}{n_t}$ And formula $\underset{k}{\mathrm{\Σ}}{P}_{\mathrm{in}}\left({\mathrm{\λ}}_k\right)\·{10}^{G_1\left({\mathrm{\λ}}_k\right)/10}=\stackrel{\‾}{G}\underset{k}{\mathrm{\Σ}}{P}_{\mathrm{in}}\left({\mathrm{\λ}}_k\right)$ Calculate and obtain described offset gain spectrum;

Or

When amplifier is operated under automated power control model, according to formula $G_1\left({\mathrm{\λ}}_k\right)-G_0\left({\mathrm{\λ}}_k\right)=\mathrm{\ΔG}\left({\mathrm{\λ}}_k\right)=10{\log }_{10}e\·(g_k^{*}+{\mathrm{\α}}_k)L\frac{\mathrm{\Δ}{\stackrel{\‾}{n}}_2}{n_t}$ And formula $\underset{k}{\mathrm{\Σ}}{P}_{\mathrm{in}}\left({\mathrm{\λ}}_k\right)\·{10}^{G_1\left({\mathrm{\λ}}_k\right)/10}={\stackrel{\‾}{P}}_{\mathrm{out}}$ Calculate and obtain described offset gain spectrum;

Wherein, λ _kmean k wavelength, L is the length of Er-doped fiber in described amplifier, described n _tfor erbium ion concentration, be illustrated under any input in Er-doped fiber erbium ion metastable be evenly distributed density with respect to Er-doped fiber under full ripple input in erbium ion at the metastable variable quantity that is evenly distributed density, be k emission ratio or the gain coefficient that wavelength is corresponding, α _kbe K the absorption coefficient that wavelength is corresponding, for the overall gain of erbium-doped fiber amplifier under automatic gain control model; for the total Output optical power of erbium-doped fiber amplifier under automated power control model, P _in(λ _k) for being input to k the input optical power that wavelength is corresponding of EDFA, △ G (λ _k) be described offset gain spectrum, G ₀(λ _k) be the reference gain spectrum of described amplifier, G ₁(λ _k) be the actual gain spectrum of the lower EDFA of input arbitrarily;

Described offset gain spectrum and described reference gain spectrum are added, obtain the actual gain spectrum of described amplifier;

According to the actual gain spectrum of each wavelength input optical power of described amplifier and described amplifier, calculate each wavelength Output optical power of described amplifier.

2. the method for claim 1, is characterized in that, described in obtain described amplifier each wavelength input optical power comprise:

Obtain each wavelength input optical power and loss across section optical fiber of being connected with described amplifier in;

According to each wavelength input optical power and loss across section optical fiber of being connected with described amplifier in, calculate each wavelength input optical power of described amplifier.

3. a device of estimating each wavelength Output optical power of amplifier, is characterized in that, described device comprises:

Acquisition module, for obtaining the reference gain spectrum of each wavelength input optical power of amplifier, described amplifier, the mode of operation parameter of described amplifier and the physical parameter of described amplifier, wherein, the reference gain of described amplifier spectrum is the gain spectral of described amplifier under full ripple input; Wherein, described amplifier is specially Erbium-Doped Fiber Amplifier, and the physical parameter of described amplifier comprises: the length of Er-doped fiber in amplifier, the concentration of erbium ion, the corresponding emission ratio of each wavelength or gain coefficient, the corresponding absorption coefficient of each wavelength; The mode of operation parameter of described amplifier comprises: automatic gain is controlled the overall gain of lower amplifier, or total Output optical power of amplifier under automated power control model;

The first computing module, for each wavelength input optical power of described amplifier of obtaining according to described acquisition module,, the reference gain of described amplifier spectrum, the mode of operation parameter of described amplifier and the physical parameter of described amplifier, calculate the actual gain spectrum of described amplifier; Wherein, calculating described offset gain spectrum specifically comprises:

When amplifier is operated under automatic gain control model, according to formula $G_1\left({\mathrm{\λ}}_k\right)-G_0\left({\mathrm{\λ}}_k\right)=\mathrm{\ΔG}\left({\mathrm{\λ}}_k\right)=10{\log }_{10}e\·(g_k^{*}+{\mathrm{\α}}_k)L\frac{\mathrm{\Δ}{\stackrel{\‾}{n}}_2}{n_t}$ And formula $\underset{k}{\mathrm{\Σ}}{P}_{\mathrm{in}}\left({\mathrm{\λ}}_k\right)\·{10}^{G_1\left({\mathrm{\λ}}_k\right)/10}=\stackrel{\‾}{G}\underset{k}{\mathrm{\Σ}}{P}_{\mathrm{in}}\left({\mathrm{\λ}}_k\right)$ Calculate and obtain described offset gain spectrum;

Or

When amplifier is operated under automated power control model, according to formula $G_1\left({\mathrm{\λ}}_k\right)-G_0\left({\mathrm{\λ}}_k\right)=\mathrm{\ΔG}\left({\mathrm{\λ}}_k\right)=10{\log }_{10}e\·(g_k^{*}+{\mathrm{\α}}_k)L\frac{\mathrm{\Δ}{\stackrel{\‾}{n}}_2}{n_t}$ And formula $\underset{k}{\mathrm{\Σ}}{P}_{\mathrm{in}}\left({\mathrm{\λ}}_k\right)\·{10}^{G_1\left({\mathrm{\λ}}_k\right)/10}={\stackrel{\‾}{P}}_{\mathrm{out}}$ Calculate and obtain described offset gain spectrum;

Wherein, λ _kmean k wavelength, L is the length of Er-doped fiber in described amplifier, described n _tfor erbium ion concentration, be illustrated under any input in Er-doped fiber erbium ion metastable be evenly distributed density with respect to Er-doped fiber under full ripple input in erbium ion at the metastable variable quantity that is evenly distributed density, be k emission ratio or the gain coefficient that wavelength is corresponding, α _kbe K the absorption coefficient that wavelength is corresponding, for the overall gain of erbium-doped fiber amplifier under automatic gain control model; for the total Output optical power of erbium-doped fiber amplifier under automated power control model, P _in(λ _k) for being input to k the input optical power that wavelength is corresponding of EDFA, △ G (λ _k) be described offset gain spectrum, G ₀(λ _k) be the reference gain spectrum of described amplifier, G ₁(λ _k) be the actual gain spectrum of the lower EDFA of input arbitrarily;

The second computing module, for each wavelength input optical power of described amplifier and the actual gain spectrum of the described amplifier that described the first computing module obtains obtaining according to described acquisition module, calculates each wavelength Output optical power of described amplifier;

Described the first computing module comprises: the first calculating sub module, be used for each wavelength input optical power of described amplifier obtaining according to described acquisition module, the reference gain of described amplifier spectrum, the mode of operation parameter of described amplifier and the physical parameter of described amplifier are calculated the actual gain spectrum of described amplifier with respect to the offset gain spectrum of reference gain spectrum;

The second calculating sub module, the reference gain spectrum of the described amplifier obtaining for described offset gain spectrum that described the first calculating sub module is calculated and described acquisition module is added, and the actual gain that obtains described amplifier is composed.

4. device as claimed in claim 3, is characterized in that, described acquisition module specifically comprises:

Obtain submodule, for obtaining each wavelength input optical power and the loss across section optical fiber being connected with described amplifier in;

The 3rd calculating sub module, for each wavelength input optical power and the loss across section optical fiber being connected according to described amplifier in, calculates the input optical power of described amplifier.

5. device as claimed in claim 4, it is characterized in that, when described device is used in each wavelength Output optical power of estimation link, described the second computing module also, for using each wavelength Output optical power of described amplifier as each wavelength input optical power across section optical fiber being connected with described amplifier out, offers described acquisition module.

6. device as claimed in claim 5, is characterized in that, when described device is used in each wavelength Output optical power of estimation link, described device also further comprises:

The 3rd computing module, when being the afterbody amplifier of described link when described amplifier, each wavelength Output optical power of the described amplifier obtaining according to described the second computing module, calculates each wavelength Output optical power of described link.