Based on digital signal processing theory, a novel and simple method is proposed to design asymmetrical film-microcavity interleaver filters (FMCIF) with arbitrary duty cycles. The transmission spectrums obtained have the characteristics of high isolation, great rectangular degree and wide flat passband. Design examples of different duty cycles are given and the influence of some key parameters on the spectral performance is discussed. The proposed method is simpler and more efficient than existing methods.
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