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Proceedings Paper

Sensor applications of a fiber optic multistable Michelson interferometer with electro-optic feedback
Author(s): Norbert Fuerstenau; Walter Schmidt
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Paper 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.

Paper Details

Date Published: 1 August 1990
PDF: 10 pages
Proc. SPIE 1267, Fiber Optic Sensors IV, (1 August 1990); doi: 10.1117/12.20295
Show Author Affiliations
Norbert Fuerstenau, Deutsche Forschungsanstalt fuer Luft- und Raumfahrt (Germany)
Walter Schmidt, Deutsche Forschungsanstalt fuer Luft- und Raumfahrt (Germany)

Published in SPIE Proceedings Vol. 1267:
Fiber Optic Sensors IV
Ralf Th. Kersten, Editor(s)

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