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Optical Engineering

Signal dependence of the phase-generated carrier method
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Paper Abstract

The phase-generated carrier (PGC) is the best-known signal-processing method for an optical fiber interferometer, and has been widely adopted for experimental systems such as hydrophones and optical fiber current sensors. It has many advantages, such as high resolution and passive sensor structure, and has been used for more than 20 years. In this paper, the signal dependence of the PGC is reported for the first time. Our results imply, in view of the highpass filter that is needed to suppress the temperature fluctuation of the interferometer, that the application of the PGC method is inappropriate for the measurement of low-frequency but sharp-rising-edge signals, such as seismic signals, whose frequency extends down to ~1 Hz and whose rising edge is very sharp. In such a case, the signal dependence will cause fatal errors. Experimental and simulation results are provided to describe the defects of this method. An analysis of the restrictions on the use of the PGC method is also provided.

Paper Details

Date Published: 1 October 2007
PDF: 5 pages
Opt. Eng. 46(10) 105602 doi: 10.1117/1.2799518
Published in: Optical Engineering Volume 46, Issue 10
Show Author Affiliations
Kuang Wu, Tsinghua Univ. (China)
Min Zhang, Tsinghua Univ. (China)
Yanbiao Liao, Tsinghua Univ. (China)

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