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

Hideki Yokoi, Yuya Shoji, Etsu Shin, Tetsuya Mizumoto

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An interferometric optical isolator that employs a nonreciprocal phase shift was studied. The optical isolator consisted of an interferometer with distinct layer structures. A traveling light wave underwent distinct nonreciprocal phase shifts such that the optical isolator could be operated in a unidirectional magnetic field. The optical isolator, in which the waveguide had a HfO2 cladding layer in one of the arms, was designed at a wavelength of 1.55 μm. The propagation distance of the nonreciprocal phase shifter required for the isolator's operation was less than 1.5 mm. The device's total length was less than 2 mm. An optical isolator with distinct layer structures was fabricated and evaluated. An isolation ratio of approximately 9.9 dB was obtained in the unidirectional magnetic field.

Original languageEnglish
Pages (from-to)4745-4752
Number of pages8
JournalApplied Optics
Issue number24
Publication statusPublished - 2004 Aug 20


ASJC Scopus subject areas

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

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