Journal
SENSORS
Volume 10, Issue 5, Pages 4373-4380Publisher
MDPI
DOI: 10.3390/s100504373
Keywords
fiber sensor; long-period fiber gratings; sagnac effect; polarization-sensitive devices
Funding
- Korean Government [KRF-2007-331-C00118]
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In the sensing applications of optical fiber grating, it is necessary to reduce the transmission-type polarization dependence to isolate the sensing parameter. It is experimentally shown that the polarization-dependent spectrum of acousto-optic long-period fiber grating sensors can be suppressed in the transmission port of a pi-shifted Sagnac loop interferometer. General expressions for the transmittance and reflectance are derived for transmission-type, reflection-type, and partially reflecting/transmitting-type polarization-dependent optical devices. The compensation of polarization dependence through the counter propagation in the Sagnac loop interferometer is quantitatively measured for a commercial in-line polarizer and an acousto-optic long-period fiber grating sensor.
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