Abstract

Elimination of a back-reflected TE mode traveling in a TM-mode optical isolator was investigated. The optical isolator had a Mach-Zehnder interferometer that included a polarization-dependent reciprocal phase shifter in one of the arms. The reciprocal phase shift was achieved by an optical path difference between the two arms. By adjustment of the length of the reciprocal phase shifter, the interferometer prevented the back-reflected TE mode from coupling into an input port of the isolator. An extinction ratio of more than 18 dB was obtained against the back-reflected TE mode at a wavelength of 1.55 µm.

© 2002 Optical Society of America

Demonstration of an optical isolator by use of a nonreciprocal phase shift

Hideki Yokoi, Tetsuya Mizumoto, Tomoaki Takano, and Nobuhiro Shinjo
Appl. Opt. 38(36) 7409-7413 (1999)

Demonstration of an optical isolator with a semiconductor guiding layer that was obtained by use of a nonreciprocal phase shift

Hideki Yokoi, Tetsuya Mizumoto, Nobuhiro Shinjo, Naoki Futakuchi, and Yoshiaki Nakano
Appl. Opt. 39(33) 6158-6164 (2000)

Wideband design of nonreciprocal phase shift magneto-optical isolators using phase adjustment in Mach-Zehnder interferometers

Yuya Shoji and Tetsuya Mizumoto
Appl. Opt. 45(27) 7144-7150 (2006)

Interferometric optical isolator employing a nonreciprocal phase shift operated in a unidirectional magnetic field

Hideki Yokoi, Yuya Shoji, Etsu Shin, and Tetsuya Mizumoto
Appl. Opt. 43(24) 4745-4752 (2004)

Amorphous-Si waveguide on a garnet magneto-optical isolator with a TE mode nonreciprocal phase shift

Eiichi Ishida, Kengo Miura, Yuya Shoji, Hideki Yokoi, Tetsuya Mizumoto, Nobuhiko Nishiyama, and Shigehisa Arai
Opt. Express 25(1) 452-462 (2017)