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Proceedings Paper

CMOS-compatible spot-size converter for optical fiber to sub-μm silicon waveguide coupling with low-loss low-wavelength dependence and high tolerance to misalignment
Author(s): Marie-Josée Picard; Christine Latrasse; Carl Larouche; Yves Painchaud; Michel Poulin; François Pelletier; Martin Guy
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Paper Abstract

One of the biggest challenges of silicon photonics is the efficient coupling of light between the sub-micron SiP waveguides and a standard optical fiber (SMF-28). We recently proposed a novel approach based on a spot-size converter (SSC) that fulfills this need. The SSC integrates a tapered silicon waveguide and a superimposed structure made of a plurality of rods of high index material, disposed in an array-like configuration and embedded in a cladding of lower index material. This superimposed structure defines a waveguide designed to provide an efficient adiabatic transfer, through evanescent coupling, to a 220 nm thick Si waveguide tapered down to a narrow tip on one side, while providing a large mode overlap to the optical fiber on the other side. An initial demonstration was made using a SSC fabricated with post-processing steps. Great coupling to a SMF-28 fiber with a loss of 0.6 dB was obtained for TEpolarized light at 1550 nm with minimum wavelength dependence. In this paper, SSCs designed for operation at 1310 and 1550 nm for TE/TM polarizations and entirely fabricated in a CMOS fab are presented.

Paper Details

Date Published: 14 March 2016
PDF: 7 pages
Proc. SPIE 9752, Silicon Photonics XI, 97520W (14 March 2016); doi: 10.1117/12.2208629
Show Author Affiliations
Marie-Josée Picard, TeraXion Inc. (Canada)
Christine Latrasse, TeraXion Inc. (Canada)
Carl Larouche, TeraXion Inc. (Canada)
Yves Painchaud, TeraXion Inc. (Canada)
Michel Poulin, TeraXion Inc. (Canada)
François Pelletier, TeraXion Inc. (Canada)
Martin Guy, TeraXion Inc. (Canada)


Published in SPIE Proceedings Vol. 9752:
Silicon Photonics XI
Graham T. Reed; Andrew P. Knights, Editor(s)

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