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Wideband optical cancellation of RF interference with phase change

A microwave photonic based RF interference cancellation scheme is proposed to compensate for wideband phase changes of the interference signals, in which microwave photonic phase shifter is particularly employed. In the proposed cancellation scheme, a known interferer is delayed, attenuated, phase shifted so as to be subtracted from the received signal at the output. The microwave photonic phase shifter based on a dual-parallel Mach-Zehnder modulator (DPMZM) is utilized to achieve wideband optical cancellation with phase changes. Proof-of-concept experiment results validate the scheme and demonstrate a 30-dB cancellation depth for a wideband signal over 4 GHz at most, limited by the bandwidth of an electrical hybrid and the bias drifting of the modulators.