27 December 1990 Design of fiber optic IIR filters for processing lightwave signals
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Realization of direct forms infinite-impulse response digital filters using various radiatively-tappered fiber optic delay lines is discussed. Such filters are attractive because they can provide better magnitude characteristics in their frequency response for a smaller number of taps than finite-impulse response filters can. These realizations use spatial light modulators and thus can be incorporated into optical adaptive filters for processing lightwave signals. Models of error sources in the fiber optical realization and their effects on both time and frequency response characteristics are explained. Cascading of lower order subsystems to obtain higher order filters is discussed. A possible way of improving the insertion loss using Erbium doped fiber optic amplifiers is derived.
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Anjan K. Ghosh, Anjan K. Ghosh, Steve N. Frank, Steve N. Frank, } "Design of fiber optic IIR filters for processing lightwave signals", Proc. SPIE 1347, Optical Information Processing Systems and Architectures II, (27 December 1990); doi: 10.1117/12.23439; https://doi.org/10.1117/12.23439

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