One-dimensional film-micro-cavity structure design for an asymmetrical interleaver filter

Abstract

Based on the theory of one-dimensional photonic crystal, an asymmetrical interleaver filter composed of thin-film glass cavities is designed. Three thin-film glass cavities are cascaded in the structure. Each cavity is formed by evaporating several layers of reflecting films on two surfaces of the glass medium. Compared with other proposed structures, this interleaver filter is very simple and easy to realize, and it has flat passband and stopband. A design example of a 50 GHz interleaver filter with the duty cycle of 1:5 is presented. The influence of the structural parameters of each reflecting film (including the glass cavity) on the spectral performance is discussed. And the design results with duty cycles of 1:3 and 1: 4 are also shown and analyzed.

Keywords

Transmission Spectrum / Duty Cycle / PbTe / Optical Thickness / Transmission Peak

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