Equalization of Chromatic Dispersion Using Wiener Filter for Coherent Optical Receivers

This letter presents a time-domain equalization method for compensation of chromatic dispersion (CD) using Wiener filter in digital coherent optical receivers. The Wiener filter can compensate CD, filter out the noise from the corrupted signal, and provide an optimal estimate of the signal of interest in the sense of minimum mean square error. The tap weights of the Wiener filter applied to a multirate system are determined by the channel impulse response and the signal-to-noise ratio. Numerical results of 16-ary quadrature amplitude modulation coherent optical multirate transmission systems show that the proposed equalizer outperforms the existing ones.