Dispersion and nonlinear compensation method and system in coherent optical communication system

A nonlinear compensation and coherent optical communication technology, applied in the field of dispersion and nonlinear compensation schemes, can solve the problem of high computational complexity, and achieve the effect of improving the calculation method, reducing the computational complexity, and increasing the step size

Active Publication Date: 2017-06-23
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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  • Dispersion and nonlinear compensation method and system in coherent optical communication system
  • Dispersion and nonlinear compensation method and system in coherent optical communication system
  • Dispersion and nonlinear compensation method and system in coherent optical 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 dispersion and nonlinear compensation method and system in a coherent optical communication system, and relates to the communication field. The method disclosed in the present invention includes: dividing the total length of the optical fiber into N steps of equal length, first performing dispersion compensation in each step, and then performing nonlinear compensation; wherein, when performing nonlinear compensation in each step, the The current sampling point is the center, and the X and Y value polarization states of the current sampling point are sampled at 2k+1 sampling points, and the power of 2 (2k+1) sampling points is calculated, and the samples with the same position on the X and Y polarization states are Add the power of the points to get 2k+1 power values, weight and sum the 2k+1 power values, and then multiply the weighted sum value by the set coefficient W to get the nonlinear phase angle of the current sampling point, according to Non-linear phase angle compensation. The invention also discloses a dispersion and nonlinear compensation system in the coherent optical communication system. The technical solution of the present application improves the calculation method of the nonlinear phase angle and reduces the calculation complexity.

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