Optical circulator

Details Optical circulator Optical circulator

1982-09-28

1984-08-07

Corbin, John K.

350 9615, 350377, 350403, G02F 100

Patent

active

044640226

ABSTRACT:
A polarization independent optical circulator is disclosed. A first birefringent plate (10) is used to separate an incident beam from a first port into two beams having orthogonal polarizations, and a second plate (11) recombines the beams at a second port. Means (12) providing nonreciprocal rotation of the polarizations are disposed between the plates. Placed between the rotating means and the second plate is a third plate (16) to further separate the beams and a reflecting element (17) for deflecting the beams toward the second port. The reflecting element includes a slotted portion (18) so that light from a third port can pass therethrough back toward the first port.

REFERENCES:
patent: 4178073 (1979-12-01), Uchida et al.
patent: 4239329 (1980-12-01), Matsumoto
patent: 4272159 (1981-06-01), Matsumoto
patent: 4359268 (1982-11-01), Kondo
patent: 4392722 (1983-07-01), Shirasaki
Electronics Letters, vol. 14, 1978, p. 816, "Compact Optical Circulator for Near-Infrared Region".
Electronics Letters, vol. 15, No. 25, Dec. 1979, pp. 830-831, "Simple Polarisation-Independent Optical Circulator for Optical Transmission Systems".
Applied Optics, vol. 20, No. 15, Aug. 1981, pp. 2683-2687, "Compact Polarization-Independent Optical Circulator".

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