Filtering effects of cascaded flex-grid roadms with high spectral resolution filters on the transmission of Nyquist and quasi-Nyquist WDM super-channels

Abstract

A cascade of two-stage coarse and fine WSS is studied for Nyquist- and quasi-Nyquist WDM systems. Results show that edge tributaries experience excess performance degradation, resulting in a transmission distance drop by about a factor of 2 for quasi-Nyquist WDM.