Open AccessEnhanced light coupling in sub-wavelength single-mode silicon on insulator waveguides
Author(s) -
Chengxin Pang,
Felice Gesuele,
Aurélien Bruyant,
Sylvain Blaize,
Gilles Lérondel,
Pascal Royer
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.006939
Subject(s) - optics , materials science , finite difference time domain method , curvature , coupling (piping) , radius of curvature , silicon on insulator , single mode optical fiber , wavelength , silicon , coupled mode theory , mode coupling , optoelectronics , waveguide , coupling loss , optical fiber , refractive index , physics , mean curvature , geometry , mathematics , mean curvature flow , metallurgy
We report on NIR efficient end-coupling in single-mode silicon on insulator waveguides. Efficient coupling has been achieved using Polymer-Tipped Optical Fibers (PTOF) of adaptable radius of curvature (ROC). When compared with commercial micro lenses, systematic studies as a function of PTOF ROC, lead for subwavelength PTOF to a coupling factor enhancement as high as 2.5. This experimental behavior is clearly corroborated by radial FDTD simulations and an absolute coupling efficiency of about 50% is also estimated.