Demodulation Schemes For Fibre Optic Sensors

A. Dandridge; A. B. Tveten; K. P. Koo; T. G. Giallorenzi

doi:10.1117/12.934584

30 August 1983 Demodulation Schemes For Fibre Optic Sensors

A. Dandridge, A. B. Tveten, K. P. Koo, T. G. Giallorenzi

Proceedings Volume 0374, Fibre Optics '83; (1983) https://doi.org/10.1117/12.934584
Event: Sira/Fibre Optics '83, 1983, London, United Kingdom

Abstract

The purpose of the demodulation scheme in fibre optic interferometers is to transform the optical output of the interferometer into an electrical signal proportional to the amplitude of the relative phase shift. Typical requirements of the detection scheme1,20,4 are: to be able to resolve signals corresponding to 10^-6 rad phase shift, to have a linear response and to have a large dynamic range (10⁶ 10⁷). Specific requirements such as packaging and low power consumption are also important. In this talk, four types of detection schemes will be discussed, two active homodyne techniques using a) a piezoelectric fibre stretcher) and b) laser tuning2 and two passive homodyne techniques using a) phase modulation3 and b) a (3x3) directional coupler.⁴ Each of these schemes have achieved prad performance, however, each scheme has specific advantages and disadvantages which will be briefly described below and discussed at the conference.

Citation Download Citation

A. Dandridge, A. B. Tveten, K. P. Koo, and T. G. Giallorenzi "Demodulation Schemes For Fibre Optic Sensors", Proc. SPIE 0374, Fibre Optics '83, (30 August 1983); https://doi.org/10.1117/12.934584

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