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Opt Lett. 2005 Apr 15;30(8):845-7.

Stratified waveguide grating coupler for normal fiber incidence.

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  • 1Nano and Micro Devices Center, University of Alabama in Huntsville, Huntsville, Alabama 35899, USA.

Abstract

We propose a new stratified waveguide grating coupler (SWGC) to couple light from a fiber at normal incidence into a planar waveguide. SWGCs are designed to operate in the strong coupling regime without intermediate optics between the fiber and the waveguide. Two-dimensional finite-difference time-domain simulation in conjunction with microgenetic algorithm optimization shows that approximately 72% coupling efficiency is possible for fiber (core size of 8.3 microm and delta=0.36%) to slab waveguide (1.2-microm core and delta=3.1%) coupling. We show that the phase-matching and Bragg conditions are simultaneously satisfied through the fundamental leaky mode.

PMID:
15865374
[PubMed]
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