Optical adaptive multi-path wideband self-interference cancellation system based on the particle swarm optimization

An optical multi-path wideband self-interference (SI) cancellation system with adaptive feedback function is proposed and demonstrated. With the help of wavelength-division multiplexing, multiple independent reference channels are constructed to mitigate the multipath effect. The particle swarm optimization (PSO) algorithm is used to adaptively adjust the operating parameters of the corresponding optical devices to optimize the cancellation performance. Experimental results show that a cancellation depth exceeding 30dB across a 200-MHz instantaneous bandwidth is achieved. A 16QAM signal with a symbol rate of 10 MBaud is successfully recovered with the assist of the proposed cancellation system.