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A comprehensive investigation of the signal-to-noise ratio (SNR) of themicrowave photonic filter (MPF) with an interferometric structure based on anincoherent broadband optical source (IBOS) is presented from the time andfrequency domains, respectively. The interferometric structure and the IBOS inthe MPF result in a beneficial single-bandpass radiofrequency (RF) response.However, the IBOS adds a relatively large noise to the filtered RF signal.Therefore, the analysis of the SNR is of great importance for the design ofthis kind of MPFs. Theoretical analysis shows that the SNR is a function of thecenter frequency of the passband, the modulation index, the chromaticdispersion, and the shape of the IBOS. An experiment is performed to verify thetheory, and experimental results agree well with the theoretical calculation.

Signal-to-Noise Ratio of Microwave Photonic Filter With an Interferometric Structure Based on an Incoherent Broadband Optical Source