Photonic signal processing is used to implement common mode signal cancellation across a very wide bandwidth utilising phase\r\nmodulation of radio frequency (RF) signals onto a narrow linewidth laser carrier. RF spectra were observed using narrowband,\r\ntunable optical filtering using a scanning Fabry Perot etalon.Thus functions conventionally performed using digital signal\r\nprocessing techniques in the electronic domain have been replaced by analog techniques in the photonic domain. This technique\r\nwas able to observe simultaneous cancellation of signals across a bandwidth of 1400MHz, limited only by the free spectral range of\r\nthe etalon.
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