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Non-linear effect analysis model and method for optical fiber communication system

A fiber optic communication system, nonlinear effect technology, applied in transmission systems, electromagnetic wave transmission systems, electrical components, etc., can solve problems such as time waste

Active Publication Date: 2019-03-12
WUHAN POST & TELECOMM RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the existing nonlinear compensation scheme requires a large number of simulations or experiments, resulting in a waste of time

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  • Non-linear effect analysis model and method for optical fiber communication system
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specific Embodiment 1

[0085] figure 1 The structural block diagram of nonlinear effect analysis model in the optical fiber communication system that the present invention provides, as figure 1 As shown, the nonlinear effect analysis model in the optical fiber communication system provided by the present invention includes:

[0086] A parameter acquisition module 10, which utilizes the network management system of the optical fiber communication system to extract the parameters of the optical fiber communication system;

[0087] A nonlinear phase shift calculation module 20, used to obtain the size of the nonlinear phase shift in the optical fiber communication system according to the parameters extracted by the parameter acquisition module 10;

[0088] A nonlinear noise calculation module 30, used to obtain the size of the nonlinear noise in the optical fiber communication system according to the parameters extracted by the parameter acquisition module 10;

[0089] A nonlinear phase noise calcula...

specific Embodiment 2

[0111] Embodiment 2 of the present invention specifically defines the calculation formula adopted by the nonlinear phase shift calculation module.

[0112] The nonlinear phase shift calculation module uses the following formula to calculate the nonlinear phase shift of the corresponding channel according to the power, modulation rate, dispersion value and line width of the corresponding channel of the communication system:

[0113]

[0114] in, is the nonlinear phase shift of the i-th channel, γ i It is the nonlinear coefficient of the fiber of the i-th channel, and the general value is 1.1W -1 km -1 , P i (z) is the signal power of the i-th channel, z is the transmission distance of the optical fiber communication system, L 1i is the effective length of the nonlinear phase shift of the i-th channel, for the system of 10Gbaud and below, L 1i Determined by loss, generally 80km, for systems higher than 10Gbaud, L 1i is determined by the dispersion of the system, and th...

specific Embodiment 3

[0118] Embodiment 3 of the present invention specifically defines the calculation formula adopted by the nonlinear noise calculation module.

[0119] The nonlinear noise calculation module uses the following formula to calculate the nonlinear noise power of the corresponding channel according to the system parameters of the optical communication system:

[0120] P NLi =N s 1+ε n i P i 3

[0121] where P NLi is the nonlinear noise power of the i-th channel, N s is the total number of spans of the multi-span optical fiber communication system, ε is the coherence coefficient, which is a constant related to the system, and can be obtained according to some existing transmission data, η i is the nonlinear noise figure of the i-th channel, P i (z) is the power of the i-th channel. It should be noted that although in the actual system, the fiber lengths of each span may be inconsistent, but there will not be too much difference. Therefore, in a multi-span optical fiber comm...

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Abstract

The invention discloses a non-linear effect analysis model and method for an optical fiber communication system. The method comprises the steps of extracting various parameters of the optical fiber communication system by using a network management system of the optical fiber communication system; according to the parameters, acquiring non-linear phase shift, non-linear noise, non-linear phase noise and non-linear signal-noise mutual effects of corresponding channels in the optical fiber communication system, and synthesizing the non-linear phase shift, non-linear noise, non-linear phase noiseand non-linear signal-noise mutual effects, and analyzing to acquire the final overall influence of the non-linear effects to signals. According to the model and method provided by the invention, byusing the non-linear effect analysis model, the influence of the non-linear effects to the signals in the system can be conveniently and quickly acquired without transmission simulation, the model andmethod can be applied to configuring and optimizing the non-linear compensation scheme in the system, the efficiency is improved, the cost is reduced, and meanwhile the higher accuracy is achieved.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to a nonlinear effect analysis model and method in an optical fiber communication system. Background technique [0002] With the development and progress of human society, communication technology has developed rapidly. Among them, optical fiber communication has many advantages such as stable signal, low loss, long transmission distance and high capacity, and has become one of the most important communication technologies in all countries in the world. [0003] Optical fiber communication technology has been developing in the direction of higher communication capacity and longer communication distance, but now the main factor limiting the further increase of signal rate and further extension of transmission distance is the nonlinear effect in optical fiber; due to the existence of nonlinear effect, When the signal power increases to a certain value, the perform...

Claims

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Application Information

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IPC IPC(8): H04B10/079
CPCH04B10/0795H04B10/07951H04B10/07955
Inventor 李蔚郑强余少华
Owner WUHAN POST & TELECOMM RES INST CO LTD