Over the past five years, the detailed analysis of the phenomena associated with interferometric measurements in a guiding medium has yielded a stability and sensitivity improvement of over 3 orders of magnitude. The most spectacular progress derived from the long forgotten virtue of the Sagnac (closed path two-wave interferometer) configuration: reciprocity. These concepts have found popular application in the fiber-optic gyroscope.1 We have applied them to a novel device, a current sensor utilizing the Faraday effect in a dosed loop guiding interferometer.

© 1981 Optical Society of America

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