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Applied Optics

Applied Optics


  • Vol. 19, Iss. 2 — Jan. 15, 1980
  • pp: 319–323

Optical isolator for semiconductor lasers

H. Kuwahara  »View Author Affiliations

Applied Optics, Vol. 19, Issue 2, pp. 319-323 (1980)

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An optical isolator for semiconductor lasers, consisting of a polarizer and a quarterwave plate, was investigated experimentally. It was assembled in a compact laser-to-fiber coupling module. Experiment showed forward loss of 1.15 dB, backward loss of 24.8 dB, and rotative tolerance of 2.4 deg for 1 dB down. The length of the module is 43.2 mm. The coupling efficiency to a graded-index multimode fiber is 37.5%. The extinction ratio is improved by 6.75 dB. The suppression effect on the influence of reflected light was investigated, using the assembled module.

© 1980 Optical Society of America

Original Manuscript: June 12, 1979
Published: January 15, 1980

H. Kuwahara, "Optical isolator for semiconductor lasers," Appl. Opt. 19, 319-323 (1980)

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