Open AccessDemonstration of a 3-dB directional coupler with enhanced robustness to gap variations for silicon wire waveguides
Author(s) -
Guangwei Cong,
Keijiro Suzuki,
S. H. Kim,
Ken Tanizawa,
Shu Namiki,
Hitoshi Kawashima
Publication year - 2014
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.22.002051
Subject(s) - optics , power dividers and directional couplers , robustness (evolution) , silicon , materials science , waveguide , refractive index , hybrid coupler , integrated optics , optoelectronics , physics , biochemistry , chemistry , gene
We demonstrate a robust 3-dB directional coupler which has a narrow silicon wire core and a wide gap. Sensitivity to the gap variation is decreased to one tenth that of a conventional directional coupler. Better spectral stability due to the enhanced robustness to waveguide geometrical fluctuations was experimentally verified.