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A modal cutoff approach to the study of buried channel waveguide couplers |
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| Authors: | James A Besley John D Love François Ladouceur Graeme Maxwell |
| Institution: | (1) JDS Uniphase, 4A Byfield Street, North Ryde, NSW, 2113, Australia;(2) Research School of Physical Sciences and Engineering, Optical Sciences Centre, The Australian National University, Canberra, ACT, 0200, Australia;(3) Virtual Photonics Inc, Helmholtzstrasse 2-9, 10587 Berlin, Germany;(4) British Telecom Research Laboratories, Martlesham Heath, Ipswich, UK |
| 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. |
| Keywords: | planer couplers planar waveguides |
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