title: Birefringent filter synthesis by use of a digital filter design algorithm.
abstract: We present an efficient method for designing birefringent filters comprising a number of birefringent sections with equal length and arbitrary orientation between two polarizers and for producing a specified spectral response in transmission. The method uses a digital filter design algorithm (i.e., the Remez algorithm) to determine an optimal polynomial approximation to obtain a specified finite impulse response, and a layer-peeling algorithm to calculate the filter structure parameters. The design procedure is demonstrated for a 14-section bandpass filter with sidelobes below -40 dB. The influence of errors in length and orientation of the birefringent sections on the filter's spectral response is also discussed.
authors.affiliation: University of Sydney, School of Electrical and Information Engineering, NSW, Australia.
authors.forename: Rui Hong
authors.initials: RH
authors.lastname: Chu
authors.forename: Graham
authors.initials: G
authors.lastname: Town