Coherent backscatter-induced drift in phase-modulated optical fibre gyroscopes

Coherent backscatter-induced drift in phase-modulated optical fibre gyroscopes

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The rotation rate measurement error produced by back-scatter from a partially coherent source has been investigated. The level of error introduced is shown to be dependent on the phase-modulation frequency. Operation at the correct frequency completely eliminates the coherent backscatter-induced errors. Taking into consideration realistic modulator stability conditions a source with a coherence length of tens of centimetres is feasible in an inertial grade, phase-modulated system.


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      • K. Bohm , P. Russer , E. Weidel , R. Ulrich . Low-noise fibre-optic rotation sensing. Opt. Lett. , 64 - 66
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      • H.C. Lefevre , R.A. Bergh , H.J. Shaw . All-fibre gyroscope with inertial-navigation short-term stability. Opt. Lett. , 454 - 456

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