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Optical Engineering

Ultracompact tapers for light coupling into two-dimensional slab photonic-crystal waveguides in the slow light regime
Author(s): Delphine Marris-Morini; Eric Cassan; Damien Bernier; Guillaume Maire; Laurent Vivien
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Paper Abstract

Optical coupling from a strip waveguide to a two-dimensional photonic crystal (PC) slab waveguide in the slow light regime is investigated. Group-velocity mismatch between optical modes is responsible for large coupling loss. Typical devices based on a W1 PC waveguide, with strip input and output waveguides on each side, are studied using finite-difference time-domain and plane-wave expansion calculations. Compact tapers based on PC lattice parameter tuning are proposed to reduce the coupling loss. At 1.6 μm, for an optical mode with group velocity vg/c=0.054, the transmission can be enhanced from 18% without tapers to 95% with a 3.4-μm-long taper on each side of the PC.

Paper Details

Date Published: 1 January 2008
PDF: 6 pages
Opt. Eng. 47(1) 014602 doi: 10.1117/1.2831132
Published in: Optical Engineering Volume 47, Issue 1
Show Author Affiliations
Delphine Marris-Morini, Univ. Paris-Sud-XI (France)
Eric Cassan, Univ. Paris-Sud-XI (France)
Damien Bernier, Univ. Paris-Sud-XI (France)
Guillaume Maire, Univ. Paris-Sud-XI (France)
Laurent Vivien, Univ. Paris-Sud-XI (France)

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