A modal cutoff approach to the study of buried channel waveguide couplers

J. A. Besley; J. D. Love; F. Ladouceur; G. Maxwell

doi:10.1023/A:1015040119069

A modal cutoff approach to the study of buried channel waveguide couplers

J. A. Besley, J. D. Love^*, F. Ladouceur, G. Maxwell

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

We investigate the higher-order supermodes of symmetric buried channel waveguide (BCW) couplers with cores of square, rectangular, and trapezoidal geometries. We show how the cutoff wavelengths of these supermodes can be used to interpret the spectral response of a practical single-mode BCW coupler. Our results highlight the design constraints imposed by second-order supermodes. We also compare the behaviour of these couplers with that of circular-core couplers to illustrate how the geometry of each core affects the coupler cutoff characteristics.

Original language	English
Pages (from-to)	317-330
Number of pages	14
Journal	Optical and Quantum Electronics
Volume	34
Issue number	4
DOIs	https://doi.org/10.1023/A:1015040119069
Publication status	Published - Apr 2002

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AB - We investigate the higher-order supermodes of symmetric buried channel waveguide (BCW) couplers with cores of square, rectangular, and trapezoidal geometries. We show how the cutoff wavelengths of these supermodes can be used to interpret the spectral response of a practical single-mode BCW coupler. Our results highlight the design constraints imposed by second-order supermodes. We also compare the behaviour of these couplers with that of circular-core couplers to illustrate how the geometry of each core affects the coupler cutoff characteristics.

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KW - Planer couplers

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JO - Optical and Quantum Electronics

JF - Optical and Quantum Electronics

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A modal cutoff approach to the study of buried channel waveguide couplers

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