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Using a 1.5-μm DFB InGaAsP laser in a passive ring cavity-type fiber gyroscope

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Abstract

It has been demonstrated that a 1.5-μm distributed feedback InGaAsP laser can be used as a coherent light source in a passive ring cavity-type fiber gyroscope. A formula for the detector shot noise-limited sensitivity of detection of rotation was derived for this type of gyroscope. Its value in the present experimental setup was estimated as being 0.8 · τ1/2 degree/hour, where τ represents the integration time of measurements. Experiments showed that the uncertainty of the detection of rotation was 1.5°/h at τ = 100 s, which was governed by the slight reflection of light at the AR-coated fiber edges and residual frequency fluctuations of the laser.

© 1987 Optical Society of America

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