Optical isolator with resonant cavity having gyrotropic material

Details Optical isolator with resonant cavity having gyrotropic material Optical isolator with resonant cavity having gyrotropic material

1989-05-01

1990-11-27

Arnold, Bruce Y.

Optics: measuring and testing

Range or remote distance finding

With photodetection

350376, 350385, 356352, G02F 109, G02F 121

Patent

active

049731203

ABSTRACT:
The invention is an optical isolator. In one embodiment the optical isolator comprises two linear polarizers, one at the input of the isolator and the other at the output. Positioned between the input and the output linear polarizer is a gyrotropic medium located within a resonant cavity such as a Fabry-Perot cavity. Interposed between the linear polarizer at the input of the isolator and the resonant cavity is a first polarization conversion means for converting received plane polarized optical energy from said linear polarizer to circularly polarized optical energy and interposed between the resonant cavity and the linear polarizer at the output of the isolator is a second polarization conversion means for converting received circular polarized optical energy from said resonant cavity to plane polarized optical energy. In an embodiment, the resonant cavity comprising the gyrotropic medium becomes the filtering medium to block reflected optical radiation.

REFERENCES:
patent: 3523718 (1970-08-01), Crow
patent: 3644016 (1972-02-01), Macken
patent: 4033670 (1977-07-01), Tanton et al.
patent: 4516073 (1985-05-01), Doriath et al.
patent: 4563092 (1986-01-01), Kaiser
patent: 4756607 (1988-07-01), Watanbe et al.
patent: 4830451 (1989-05-01), Stone
"Bulk Optical Isolator Tunable from 1.2 .mu.m to 1.7 .mu.m", by R. M. Jopson et al., Electronics Letters, Aug. 29, 1985, vol. 21, No. 18.

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