Open AccessHigh-performance silicon-on-insulator grating coupler with completely vertical emission
Author(s) -
Hsin-Lun Tseng,
Erik Chen,
Haisheng Rong,
Neil Na
Publication year - 2015
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.23.024433
Subject(s) - optics , grating , materials science , silicon on insulator , coupling loss , coupled mode theory , wavelength , lithography , fiber bragg grating , coupling (piping) , optoelectronics , silicon , optical fiber , refractive index , physics , metallurgy
We study the physical concept of utilizing a critical coupling to obtain a high-performance grating coupler with completely vertical emission on a silicon-on-insulator substrate. Following our design strategy, we numerically show that when our grating coupler is coupled to a standard single-mode fiber operating at 1310 nm wavelength, a -1.46 dB coupling loss, a 20 nm spectral full-width-half-maximum, and a -24 dB back reflection can be achieved at the same time without full optimization. A practical design that largely relaxes the stringent lithography requirement is also proposed and presented.