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Proceedings Paper

Demodulation Schemes For Fibre Optic Sensors
Author(s): A. Dandridge; A. B. Tveten; K. P. Koo; T. G. Giallorenzi
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Paper 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.

Paper Details

Date Published: 30 August 1983
PDF: 4 pages
Proc. SPIE 0374, Fibre Optics '83, (30 August 1983);
Show Author Affiliations
A. Dandridge, Naval Research Laboratory (United States)
A. B. Tveten, Naval Research Laboratory (United States)
K. P. Koo, Naval Research Laboratory (United States)
T. G. Giallorenzi, Naval Research Laboratory (United States)

Published in SPIE Proceedings Vol. 0374:
Fibre Optics '83
Lionel R. Baker, Editor(s)

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