Wavelength division demultiplexing of Nyquist WDM signals under frequency offset and receiver-side IQ impairments

The interaction among wavelength division demultiplexing (WDD), frequency offset estimation, and receiver-side IQ impairment compensation in Nyquist WDM systems is reported for the first time. We propose a novel WDD scheme effective against such interactive impairments and demonstrate its performance through proof-of-concept transmission experiments.