Determining optical signal transit delay time in an optical inte

Details Determining optical signal transit delay time in an optical inte Determining optical signal transit delay time in an optical inte

1991-02-22

1992-12-08

Turner, Samuel

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

051702258

ABSTRACT:
In a fiber optic gyroscope 10 having a pair of light waves counter-propagating in a fiber optic loop 44, a phase modulator 28 driven with a variable frequency and amplitude modulation signal on a line 32 so as to null any rotation induced optical phase shift, and using the difference between the drive frequency and the loop eigenfrequency as a measure of rotation rate, is provided with a calibration circuit which determines the actual loop eigenfrequency while in rotation. A modulation signal is applied having an amplitude that causes the closed loop output frequency to equal the loop eigenfrequency independent of rotation rate. The amplitude is fine tuned by applying a phase dither and adjusting the amplitude until effects of the dither are minimized.

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