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.
A grating-based coupler for fiber to silicon waveguide excitation / Masanovic, Goran Z.; Reed, Graham T.; Passaro, Vittorio; Headley, William R.; Josey, Mike R.; Ensell, Graham J.; Atta, Raghied M. H.; Evans, Alan G. R.. - STAMPA. - 5451:(2004), pp. 381-392. (Intervento presentato al convegno Conference Optics and Photonic Integrated Circuits tenutosi a Strasbourg, France nel April 27-29, 2004) [10.1117/12.545920].
A grating-based coupler for fiber to silicon waveguide excitation
Vittorio Passaro;
2004-01-01
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
