Fiber optic Michelson sensor and arrays with passive elimination

Details Fiber optic Michelson sensor and arrays with passive elimination Fiber optic Michelson sensor and arrays with passive elimination

1992-09-01

1993-04-27

Lee, John D.

Optical waveguides

With optical coupler

Plural

385 12, 356351, 25022727, G02B 628

Patent

active

052069249

ABSTRACT:
A fiber optic Michelson interferometric sensor system with passive elimination of polarization fading and source feedback isolation is disclosed. In a preferred embodiment, an optical source provides light of a first polarization state to a polarization selective element. Output light from the polarization selective element passes through a length of optical fiber into a Michelson interferometric sensor which utilizes a Faraday rotator/mirror assembly, that is coupled to distal ends of sensing and reference arms of the Michelson interferometer, to provide for the passive elimination of polarization fading. The polarization selective element at the output of the optical source provides isolation of the optical source from the Michelson interferometer sensor.

REFERENCES:
patent: 4588296 (1986-05-01), Cahill et al.
patent: 4929050 (1990-05-01), Wilson
"A Universal Compensator for Polarization Changes Induced by Birefringence n a Retracing Beam", by Mario Martinelli, Optics Communications, vol. 72, No. 6; 15 Aug., 1989; pp. 341-344.

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