Journal
OPTICS COMMUNICATIONS
Volume 253, Issue 4-6, Pages 276-282Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2005.04.078
Keywords
multimode interference; self-imaging; modal propagation analysis; silicon on insulator; tapered structure; vertical modes
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Multimode effects in a multimode interference (MMI) coupler based on silicon-on-insulator (SOI) are analyzed. Multimode interference in the vertical direction of an SOI-based MMI device degrades the self-imaging quality. Taper structures are introduced at the junction between input/output waveguides and multimode region to suppress the excitation of the undesired vertical modes. A 1 x 4 MMI coupler of low insertion loss (0.101 dB) and small non-uniformity (0.102 dB) is designed as a numerical example. (c) 2005 Elsevier B.V. All rights reserved.
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