title: Amorphous-Si waveguide on a garnet magneto-optical isolator with a TE mode nonreciprocal phase shift.
abstract: 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.
authors.forename: Eiichi
authors.initials: E
authors.lastname: Ishida
authors.forename: Kengo
authors.initials: K
authors.lastname: Miura
authors.forename: Yuya
authors.initials: Y
authors.lastname: Shoji
authors.forename: Hideki
authors.initials: H
authors.lastname: Yokoi
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Mizumoto
authors.forename: Nobuhiko
authors.initials: N
authors.lastname: Nishiyama
authors.forename: Shigehisa
authors.initials: S
authors.lastname: Arai