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
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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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