Enhanced light coupling in sub-wavelength single-mode silicon on insulator waveguides

Chengxin Pang (1) , Felice Gesuele (1) , Aurélien Bruyant (1) , Sylvain Blaize (1) , Gilles Lerondel (1) , Pascal Royer (1)

1 LNIO - Laboratoire de Nanotechnologie et d'Instrumentation Optique

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.

Keywords: Coupling efficiency; Diode lasers; Numerical simulation; Optical directional couplers; Single mode fibers; Waveguide modes

Domains: Engineering Sciences [physics]; Optics / Photonic

Chengxin Pang, Felice Gesuele, Aurélien Bruyant, Sylvain Blaize, Gilles Lerondel, et al.. Enhanced light coupling in sub-wavelength single-mode silicon on insulator waveguides. Optics Express, 2009, 17 (9), pp.6939. ⟨10.1364/OE.17.006939⟩. ⟨hal-02311129⟩