Method and apparatus for overcoming cross-coupling in a fiber op

Details Method and apparatus for overcoming cross-coupling in a fiber op Method and apparatus for overcoming cross-coupling in a fiber op

1996-03-11

1997-10-28

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

056822413

ABSTRACT:
A phase modulator applies sequences of artificial phase shifts in the region of overmodulation between light beams counterpropagating within the sensor coil of a Sagnac interferometer to obtain improved random walk performance. The sequences are composed of phase shifts of .+-.a.pi./2b and .+-.(4b-a).pi./2b where a is an odd integer and b is an integer greater than 1. The waveform for driving the phase modulator is derived from a 2.pi. radian mapping plotted so that adjacent driving signal values differ by a.pi./2b or -(4b-a).pi./2b in a first angular direction and by -a.pi./2b or by (4b-a).pi./2b in the opposite angular direction. Angular transitions about the mapping may be predetermined to generate a deterministic, random, or pseudo-random modulation sequence. In the event that a deterministic sequence is chosen, it is examined for orthogonality properties to assume zero average output bias from crosstalk.

REFERENCES:
patent: 5189488 (1993-02-01), Mark et al.
patent: 5289257 (1994-02-01), Kurokawa et al.
patent: 5530545 (1996-06-01), Pavlath

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