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18 August 2004 A grating-based coupler for fiber-to-silicon waveguide excitation
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Recently there has been a strong trend to fabricate smaller photonic devices. In the literature, the problem of coupling optical fibres with thin semiconductor waveguides has not been solved sufficiently well to obtain both high coupling efficiency and good fabrication tolerances. This paper discusses a new approach, the Dual Grating-Assisted Directional Coupling (DGADC), which can result in a robust and very efficient device, with relaxed fabrication tolerances. Theoretical investigation of the coupler is presented. Coupling efficiency and device length are determined as functions of layer thicknesses and refractive indices, grating periods, depths and duty ratios, and finally wavelength. Fabrication of the coupler is also given, as well as preliminary experimental results.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Goran Z. Masanovic, Graham T. Reed, Vittorio M. N. Passaro, William R. Headley, Mike R. Josey, Graham J. Ensell, Raghied M. H. Atta, and Alan G. R. Evans "A grating-based coupler for fiber-to-silicon waveguide excitation", Proc. SPIE 5451, Integrated Optics and Photonic Integrated Circuits, (18 August 2004);

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