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In this paper, we propose to use a multi-longitudinal-mode (MLM) laser as the source of an infinite-impulse response (IIR) microwave photonic filter (MPF) to obtain GHz level free spectral range (FSR). The response function of such an IIR-MPF and the degree of coherence of the laser are discussed theoretically. The degree of coherence of the MLM laser shows a periodic structure which is significantly different to that of single mode lasers. By engineering the degree of coherence of the MLMdoi:10.1364/oe.23.004277 pmid:25836464 fatcat:pfolmcqj3rbu5guhxdeuqagtfy