Optical coherent technology leads to the coexistence of signals with different modulation formats and different bit rates in optical networks. Due to this coexistence, several in-band crosstalk scenarios are possible. In this work, the impact of in-band crosstalk due to M-QAM interferers on the performance of PDM-QPSK and PDM-16-QAM coherent receivers at an aggregated bit rate of 100 Gbps is studied. The influence of the duty-cycle, time misalignment and phase difference between interferers and selected signal on the receiver performance is also assessed. We show that the QPSK signal with a duty-cycle of 33% is, generally, the most tolerant selected signal to in-band crosstalk and the less detrimental interferer to the coherent receiver performance. Additionally, we show that the time misalignment has a significant influence on the in-band crosstalk impact, when the duty-cycles of the interferers or selected signal are low.

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In-band crosstalk; Optical communications; coherent detection

• Ciências Físicas - Ciências Naturais

Esta publicação está associada ao registo seguinte:

• Impact of In-Band Crosstalk Signals with Different Duty-Cycles in M-QAM Optical Coherent Receivers