Fiber optic gyro

Details Fiber optic gyro Fiber optic gyro

1992-06-12

1993-02-16

Ullah, Akm E.

Optical waveguides

Polarization without modulation

356350, G02B 530

Patent

active

051877570

ABSTRACT:
An optical fiber coil in a fiber optic gyro is formed by a single mode optical fiber and two polarization retaining optical fibers of the same length connected respectively to both ends of the single mode optical fiber. The polarization retaining optical fibers and an optical fiber coupler are connected, and clockwise and counterclockwise light beams are distributed and supplied by the optical fiber coupler to the optical fiber coil, and the two light beams having returned to the optical fiber coupler are thereby caused to interfere with each other. The lengths of the X-axis and Y-axis components of light are displaced apart in phase to such an extent as not to interfere with each other, by the birefringent property induced in the coil of the single optical fiber and the birefringent property of the polarization retaining optical fibers themselves.

REFERENCES:
patent: 4712306 (1987-12-01), Cahill et al.
patent: 5054923 (1991-12-01), Okada
patent: 5136667 (1992-08-01), Ohno et al.

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