Performance Evaluation of a Reconfigurable Optical Add Drop Multiplexer Design for High-Order Regular and Offset-QAM Signals

In this paper, we investigate the performance of a Reconfigurable Optical Add Drop Multiplexer (ROADM) architecture, that is suitable of supporting high-order regular as well as offset based QAM signals. In the proposed design, a bank of Phase Sensitive Amplification (PSA) subsystems is introduced for processing offset QAM signals, while sub-channel extraction is achieved via waveform splitting and coherent subtraction. Numerical studies have been carried out to validate functional performance, when processing high-order regular and offset based QAM signals.