Sensor applications of a fiber optic multistable Michelson interferometer with electro-optic feedback

Norbert Fuerstenau; Walter Schmidt

doi:10.1117/12.20295

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1 August 1990 Sensor applications of a fiber optic multistable Michelson interferometer with electro-optic feedback

Norbert Fuerstenau, Walter Schmidt

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Proceedings Volume 1267, Fiber Optic Sensors IV; (1990) https://doi.org/10.1117/12.20295
Event: The International Congress on Optical Science and Engineering, 1990, The Hague, Netherlands

Abstract

A fiberoptic Michelson interferometer with electrooptic feedback via a piezoelectric fiber stretcher exhibits a stepwise increase of the output signal and PZT position under continuously increasing input power. Depending on the characteristic time constants the system becomes unstable and starts self oscillations at a certain critical input intensity. A linear stability analysis of the 3rd order differential equation used to describe the system reveals the number of stable states increases with the ratio -cIT of the system time constant N) and the feedback delay time (T). In laboratory investigations the maximum number of umax 113 stable states was achieved with i 0.10 and -nT > 45. The ambiguity of the input/output characteristic in the stable region which is due to the multistable hysteresis may be eliminated by chopping the input of the feedback amplifier. The power spectral density of the interferometer signal exhibits a characteristic change after transition into the instable region.

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Norbert Fuerstenau and Walter Schmidt "Sensor applications of a fiber optic multistable Michelson interferometer with electro-optic feedback", Proc. SPIE 1267, Fiber Optic Sensors IV, (1 August 1990); https://doi.org/10.1117/12.20295

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