Patent ID: 9425900
Filing Date: 2016-08-23
CPC Classification: H04B,H04L

Claim Text:
1. A chromatic dispersion processing apparatus comprising an equalizer loop comprising: a frequency domain equaliser arranged to receive samples of an electrical representation of an optical communications signal having a chromatic dispersion, and further arranged to apply chromatic dispersion compensation to the samples, to form dispersion corrected samples having a residual chromatic dispersion value; a time domain equaliser arranged to receive the dispersion corrected samples and to generate a representation of a channel linear transfer function of the optical communications signal from the dispersion corrected samples, and further arranged to generate and transmit a monitoring signal comprising the representation of the channel linear transfer function; an optical performance monitoring apparatus arranged to receive the monitoring signal and to estimate the residual chromatic dispersion value from the representation of the channel linear transfer function; and a processor arranged to receive the estimated residual value and to compare the estimated residual value to a threshold value, and further arranged to generate and transmit to the frequency domain equaliser an estimation signal comprising the estimated residual value unless the estimated residual value is less than the threshold value.