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Method and system for performing chromatic dispersion and nonlinearity compensation in coherent light communication system

A technology of nonlinear compensation and coherent optical communication, applied in optical transmission system, transmission system, electromagnetic wave transmission system, etc., can solve the problem of high computational complexity, achieve the effect of improving calculation method, reducing computational complexity, and increasing step size

Active Publication Date: 2013-03-20
ZTE CORP
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Problems solved by technology

[0016] The technical problem to be solved by the present invention is to provide a dispersion and nonlinear compensation method and system in a coherent optical communication system to overcome the defects of existing algorithms such as high computational complexity and the need for dispersion compensation optical fiber to compensate dispersion

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  • Method and system for performing chromatic dispersion and nonlinearity compensation in coherent light communication system
  • Method and system for performing chromatic dispersion and nonlinearity compensation in coherent light communication system
  • Method and system for performing chromatic dispersion and nonlinearity compensation in coherent light communication system

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Embodiment 1

[0044] This embodiment introduces a dispersion and nonlinear compensation method in a coherent optical communication system. The principle of the scheme is as follows figure 2 shown. It uses a low-complexity dispersion nonlinear compensation algorithm to compensate the dispersion nonlinearity in the polarization multiplexing wavelength division multiplexing system of the 16QAM modulation format. The detailed compensation process is as follows.

[0045] First, the total length of the fiber is divided into N parts of equal length (N is much smaller than the requirements of the traditional reverse compensation algorithm), that is, N steps of equal length, and the dispersion and nonlinear effects are separately compensated in each step. Combining the dispersion compensation operator to perform dispersion compensation on all data points within the step size; and then perform nonlinear compensation. Among them, when performing nonlinear compensation, it is no longer just using the...

Embodiment 2

[0054] This embodiment introduces a dispersion and nonlinear compensation system in a coherent optical communication system, and the system includes at least the following modules.

[0055] The first module divides the total length of the optical fiber into N steps of equal length;

[0056] In the second module, in each step, the dispersion compensation operator is combined to perform dispersion compensation on each data point in the step;

[0057] The third module performs nonlinear compensation in each step;

[0058] Among them, when nonlinear compensation is performed in each step, the position of the current sampling point is taken as the center, and 2k+1 sampling points of the polarization state of the X and Y values ​​of the current sampling point are sampled, and the 2(2k+ 1) the power of sampling points, the power of the same sampling points on the X and Y polarization states is added to obtain 2k+1 power values, and the 2k+1 power values ​​are weighted and summed, an...

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Abstract

The invention discloses a method and system for performing chromatic dispersion and nonlinearity compensation in coherent light communication system and relates to the field of communication. The method comprises the steps of dividing a total optical fiber length into N equilong step lengths, first performing the chromatic dispersion in the step lengths and then performing the nonlinearity compensation, wherein an existing sampling point serves as a center when the nonlinearity compensation is performed in the step lengths, sampling polarization states of X values and Y values of 2k+1 sampling points, calculating power of 2(2k+1) sampling points, counting up the power of the sampling points at the same positions of the polarization states of X values and Y values to obtain 2k+1 power values, performing weighted summation of the 2k+1 power values, enabling a value obtained through the weighted summation to multiply by a set coefficient W to obtain a nonlinearity phase angle of the existing sampling point, and performing compensation to the nonlinearity phase angle. By means of the technical scheme, a calculating mode of the nonlinearity phase angle is improved, and computation complexity is reduced.

Description

technical field [0001] The invention relates to the communication field, and more specifically relates to a dispersion and nonlinear compensation scheme in a system using 16QAM modulation format for polarization multiplexing wavelength division multiplexing coherent optical communication. Background technique [0002] The optical fiber communication system started in the early 1970s, using an intensity-modulated semiconductor laser, and the received light intensity signal is converted into an electrical signal through a photodiode. This approach is called intensity modulation / direct detection (IM / DD), and is widely used in current commercial optical fiber communication systems. However, direct detection / intensity modulation has its inherent shortcomings, such as the reception and sensitivity are limited by noise, the spectral efficiency is not high, and the bandwidth cannot be fully utilized. Coherent detection has attracted widespread attention. On the one hand, coherent d...

Claims

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Application Information

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IPC IPC(8): H04B10/2525H04B10/2543
CPCH04B10/2525H04B10/2543H04B10/2513H04B10/299H04B10/616H04B2210/252
Inventor 沈百林喻松杨杰李敏良
Owner ZTE CORP
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