Method and Device for Estimation of Chromatic Dispersion in Optical Coherent Communication

摘要

Disclosed are a chromatic dispersion estimation method and device in optical coherent communication, wherein, the method includes: performing a fast Fourier transform on IQ-imbalance compensated data to obtain frequency-domain data in two polarization directions; calculating autocorrelation sequences of the frequency-domain data and performing an inverse fast Fourier transform on the values of the autocorrelation sequences; calculating modulus squares of the results of the inverse fast Fourier transform, and adding the results in the two polarization directions to obtain; determining a mean value of s of a plurality of data sets; calculating an index of the maximum value of, and estimating a dispersion value of the optical fiber link according to the index of the maximum value of. The abovementioned technical solution allows a significantly accurate and rapid estimation of dispersion values.

主权项

1. A dispersion estimation method in optical coherent communication, comprising:
performing a fast Fourier transform on IQ-imbalance compensated data to obtain frequency domain data in two polarization directions; respectively calculating autocorrelation sequences of the frequency domain data in the two polarization directions to obtain values of the two autocorrelation sequences corresponding to the frequency domain data in the two polarization directions; respectively performing the fast inverse Fourier transform on the values of the two autocorrelation sequences to obtain two inverse Fourier transform results; respectively calculating modulus squares of the two fast inverse Fourier transform results to obtain two modulus square results; adding the two modulus square results to obtain a sum of the modulus square results P[n]; for a plurality of IQ-imbalance compensated data, calculating a plurality of sums of the modulus square results, averaging all sums of the modulus square results to obtain a dispersion objective function P[n]; calculating an index n0 of a maximum value of the dispersion objective function P[n], and estimating an optical fiber link dispersion value based on the index n0.