title: GaInAsP/InP MZI waveguide optical isolator integrated with spot size converter.
abstract: We fabricated a waveguide optical isolator with a GaInAsP guiding layer integrated with spot size converters (SSCs) for efficient coupling to optical fibers. The isolator is constructed with a Mach-Zehnder interferometer (MZI), which is composed of multi-mode interference (MMI) couplers, as well as nonreciprocal and reciprocal phase shifters. The nonreciprocal phase shifter is constructed with a magneto-optical cladding layer directly bonded to a semiconductor guiding layer. The performance of the GaInAsP waveguide optical isolator was demonstrated with a maximum optical isolation of 28.3 dB at a wavelength of 1558 nm for the TM mode.
authors.affiliation: Department of Electrical and Electronic Engineering, Tokyo Institute of Technology, 2-12-1-S9-9 Ookayama, Meguro-ku, Tokyo 152-8552, Japan.
authors.forename: Yohei
authors.initials: Y
authors.lastname: Sobu
authors.forename: Yuya
authors.initials: Y
authors.lastname: Shoji
authors.forename: Kazumasa
authors.initials: K
authors.lastname: Sakurai
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Mizumoto