Chromatic dispersion processing apparatus and method

摘要

Chromatic dispersion (CD) processing apparatus comprises an equalizer loop comprising: a frequency domain equalizer (FDE) arranged to receive samples of an electrical representation of an optical communications signal having CD and to apply CD compensation to the samples, to form dispersion corrected samples having a residual CD value; a time domain equalizer arranged to receive the corrected samples and to generate a representation of a channel linear transfer function of the signal from the corrected samples, to generate and transmit a monitoring signal comprising said representation; optical performance monitoring apparatus arranged to receive the monitoring signal and to estimate the residual CD value; and a processor arranged to receive the estimated residual value and to compare it to a threshold value and to generate and transmit to the FDE an estimation signal comprising the estimated value unless it is less than the threshold.

主权项

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.