Abstract
Fiber-optic gyroscopes sense rotation by detecting the phase shift experienced by two counterpropagating beams in a Sagnac interferometer. The very small Sagnac phase shifts experienced by the two beams are nonreciprocal for a rotating gyroscope in that the phase shifts seen by the forward beam (intensity l+) and the backward beam (intensity l-) are not equal.1
© 1983 Optical Society of America
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