Elimination of a back-reflected TE mode in a TM-mode optical isolator with a Mach-Zehnder interferometer

Hideki Yokoi, Tetsuya Mizumoto, Shinpei Kuroda, Takafumi Ohtsuka, Yoshiaki Nakano

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3 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)7045-7051
Number of pages7
JournalApplied Optics
Issue number33
Publication statusPublished - 2002 Nov 20


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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