Impact of Multi-Rate and Multi-Format Crosstalk Signals on the Performance of 40 Gbit/s DQPSK Optical Receivers

Abstract

The coexistence of signals with different modulation formats and different bit rates in metropolitan optical networks is, nowadays, a reality. In-band crosstalk can be very detrimental to the performance of those networks. In this work, the impact of in-band crosstalk due to multi-format and multi-rate signals on the performance of 40 Gbit/s DQPSK optical receivers is evaluated. It is shown that the worst interferer is the 10 Gbit/s OOK signal, which is the most common modulation format in today's optical networks.