Open AccessAmorphous-Si waveguide on a garnet magneto-optical isolator with a TE mode nonreciprocal phase shift
Author(s) -
Eiichi Ishida,
Kenichiro Miura,
Yuya Shoji,
Hiroyoshi Yokoi,
Tetsuya Mizumoto,
Nobuhiko Nishiyama,
Shigehisa Arai
Publication year - 2017
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.25.000452
Subject(s) - optical isolator , materials science , isolator , optics , phase shift module , waveguide , interferometry , amorphous solid , optoelectronics , substrate (aquarium) , phase (matter) , insertion loss , optical fiber , physics , electrical engineering , chemistry , organic chemistry , oceanography , quantum mechanics , geology , engineering
We fabricated a magneto-optical (MO) isolator with a TE mode nonreciprocal phase shift. The isolator is based on a Mach-Zehnder interferometer composed of 3-dB directional couplers, a reciprocal phase shifter, and a nonreciprocal phase shifter. To realize TE mode operation in the optical isolator, we designed a novel waveguide structure composed of a hydrogenated amorphous silicon waveguide with an asymmetric MO garnet lateral clad on a garnet substrate. The isolator operation is successfully demonstrated in a fabricated device showing the different transmittances between forward and backward directions. The maximum isolation of the fabricated isolator is 17.9 dB at a wavelength of 1561 nm for the TE mode.