Optical device having function of optical circulator

Details Optical device having function of optical circulator Optical device having function of optical circulator

1997-05-29

1999-12-07

Spyrou, Cassandra

Optical: systems and elements

Polarization without modulation

Polarization using a time invariant electric, magnetic, or...

359487, 359495, 359496, 385 11, G02B 530

Patent

active

059993138

ABSTRACT:
An optical device having a function of an optical circulator of which forward losses are uniformly small while reverse losses are uniformly great. The optical device applicable to be used as an improved three-port optical circulator has three optical coupling units connected optically to three ports respectively, a reflecting unit for giving a polarization plane rotation of 90.degree. to an input beam, and a main polarization beam splitter having a polarized-wave separating film for optically connecting the optical coupling units and the reflecting unit through transmission and reflection. Each of the optical coupling units comprises a subsidiary polarization beam splitter and a polarization converter. The subsidiary polarization beam splitter couples the relevant port to first and second polarized beams perpendicular to each other. The polarization converter converts the polarization state of one of the first and second polarized beams in such a manner that the first and second polarized beams are transmitted through or reflected by the polarized-wave separating film in accordance with the directions of the beams.

REFERENCES:
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patent: 5682446 (1997-10-01), Pan et al.
patent: 5689593 (1997-11-01), Pan et al.
patent: 5878178 (1999-03-01), CHeng
Y. Fujii, "Polarization-Independent Optical Circulator Having High Isolation Over a Wide Wavelength Range", IEEE Photonics Technology Letters, vol. 4, No. 2, Feb. 1992, pp. 154-156.
Patent Abstracts of Japan, No. 04216522, Aug. 6, 1992 Nippon Telegr. & Teleph. "3 Terminal Optical Circulator".
Patent Abstracts of Japan No. 06258599, Sep. 16, 1994 Fuji Electrochem. "Three-Port Type Optical Circulator".
M. Shirasaki, et al., "A Compact Optical Polarization-Independent Optical Circulator"; The Transactions of the IECE of Japan, vol. E 64, No. 1, (Jan. 1981), pp. 30-31.

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