DISPERSION AND NONLINEARITY COMPENSATION METHOD AND SYSTEM IN A COHERENT OPTICAL COMMUNICATION SYSTEM

摘要

Dispersion and non-linear compensation method and system in a kind of coherent optical communication system. The described method includes: optical fiber overall length to be divided into isometric N number of step-length, dispersion compensation is first carried out in each step-length, then carry out nonlinear compensation; Wherein, the step of nonlinear compensation is carried out in each step-length includes: centered on current sampling point, 2k+1 sampling point sampling each to X and Y polarization states, calculate 2(2k+1) power of a sampled point, the power of the identical sampled point in position in X with Y polarization states is added, obtain 2k+1 performance number, to 2k+1 performance number weighted sum, again by the value of weighted sum multiplied by setting coefficient W after obtain the non-linear phase angle of current sampling point, it is compensated according to non-linear phase angle, wherein, the N and k is positive integer. In the technical solution of the embodiment of the present invention, the calculation of non-linear phase angle is improved, computation complexity is reduced.