Demodulation of interferometric sensors using a fiber-optic passive quadrature demodulator

The passive quadrature demodulator (PQD) eliminates the phase stretcher and feedback electronics frequently used in fiber interferometric sensors by passively extracting the desired signal using two distinct interferometers which differ in phase by \pi/2 . A fusion technique is described to fabricat...

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Bibliographic Details
Published in:Journal of lightwave technology 1983-09, Vol.1 (3), p.519-523
Main Authors: Stowe, D., Tsung-Yuan Hsu
Format: Article
Language:English
Subjects:
Demodulation
Interferometers
Magnetic sensors
Optical feedback
Optical fiber couplers
Optical fiber polarization
Optical fiber sensors
Optical interferometry
Optical sensors
Temperature sensors
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Description
Summary:The passive quadrature demodulator (PQD) eliminates the phase stretcher and feedback electronics frequently used in fiber interferometric sensors by passively extracting the desired signal using two distinct interferometers which differ in phase by \pi/2 . A fusion technique is described to fabricate a fiber PQD which is sufficiently stable with respect to temperature, polarization, and wavelength to maintain the sensitivity of interferometric sensors constant to 0.25 dB.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.1983.1072135