Design of long-period waveguide grating filter by control of waveguide cladding profile

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)3540-3546
Journal / PublicationJournal of Lightwave Technology
Issue number9
Publication statusPublished - Sep 2006


A simple and convenient method of designing long-period waveguide grating filters to generate sophisticated transmission characteristics is described. The method is based on controlling the index or thickness profile of the waveguide cladding along a uniform grating and thus avoids the use of specially designed grating masks. The flexibility of the method with the design of phase-shifted gratings, chirped gratings, and broadband filters is demonstrated. It was found that the index and thickness changes required for a significant change in the transmission characteristics of a grating are within the ranges that can be achieved easily with ultraviolet irradiation on photosensitive films. The method described in this paper provides a powerful approach of realizing various kinds of grating filters. © 2006 IEEE.

Research Area(s)

  • Long-period gratings, Optical polymer waveguides, Optical waveguide filters