Digital phase modulator for fiber optic sagnac interferometer

Details Digital phase modulator for fiber optic sagnac interferometer Digital phase modulator for fiber optic sagnac interferometer

1991-03-18

1992-08-11

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

385 14, G01C 1972

Patent

active

051373599

ABSTRACT:
A phase modulator for use in a circuit for measuring the output of a fiber optic gyroscope. The phase modulator is adapted to receive the digital word generated by such a circuit that comprises phase shift information. The digital word includes both the feedback Serrodyne ramp and the phase modulation conventionally generated for shifting the operating point of the gyroscope to enhance the sensitivity of output beam intensity to phase difference. The modulator employs a plurality of electrode elements with the lengths of adjacent segments having a power-of-two relationship. As a result, the digital word may be directly received by the phase modulator without prior conversion to an analog signal.

REFERENCES:
patent: 4705399 (1987-11-01), Graindorge et al.
patent: 4789241 (1988-12-01), Michal et al.
patent: 5018859 (1991-05-01), Chang et al.

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