Mixture of Optical Quadrature-Phase Shift Keying and Continuous-Phase Frequency Shift Keying Advanced methods for monitoring optical performance in future photonic networks

This research shows that hybrid fibre systems that transmit data using both CPFSK and OQPSK (optical quadrature-phase-shift-keying) modulation techniques function well. It examines how the maximum Q factor and the minimum bit error rate vary with modulation frequency and fibre length using the proposed hybrid modulation transmission techniques. Fibre length variations at a constant modulation frequency of 300 GHz also simulate variations in optical power and received electrical power. It uses hybrid modulation techniques for CPFSK/OQPSK with 35 bits per symbol and a modulation frequency of 301 GHz to achieve varying maximum Q Factor, minimum BER, maximum signal power, and minimum noise power throughout a 35 km fibre length.