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Proceedings Paper

A grating-based coupler for fiber-to-silicon waveguide excitation
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Paper Abstract

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.

Paper Details

Date Published: 18 August 2004
PDF: 12 pages
Proc. SPIE 5451, Integrated Optics and Photonic Integrated Circuits, (18 August 2004); doi: 10.1117/12.545920
Show Author Affiliations
Goran Z. Masanovic, Univ. of Surrey (United Kingdom)
Graham T. Reed, Univ. of Surrey (United Kingdom)
Vittorio M. N. Passaro, Politecnico di Bari (Italy)
William R. Headley, Univ. of Surrey (United Kingdom)
Mike R. Josey, Univ. of Southampton (United Kingdom)
Graham J. Ensell, Univ. of Southampton (United Kingdom)
Raghied M. H. Atta, Univ. of Southampton (United Kingdom)
Alan G. R. Evans, Univ. of Southampton (United Kingdom)


Published in SPIE Proceedings Vol. 5451:
Integrated Optics and Photonic Integrated Circuits
Giancarlo C. Righini; Seppo Honkanen, Editor(s)

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