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Sensors 2010, 10(5), 4373-4380; https://doi.org/10.3390/s100504373

Polarization Dependence Suppression of Optical Fiber Grating Sensor in a π-Shifted Sagnac Loop Interferometer

1
School of Medicine, Korea University, Seoul, 136-705, Korea
2
Department of Physics, Chungnam National University, Daejeon, 305-764, Korea
3
W.C.U. Department of Cogno-Mechatronics, Pusan National University, Busan, 609-735, Korea
*
Author to whom correspondence should be addressed.
Received: 23 March 2010 / Revised: 23 April 2010 / Accepted: 23 April 2010 / Published: 29 April 2010
(This article belongs to the Section Chemical Sensors)
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Abstract

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 π-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. View Full-Text
Keywords: fiber sensor; long-period fiber gratings; sagnac effect; polarization-sensitive devices fiber sensor; long-period fiber gratings; sagnac effect; polarization-sensitive devices
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Son, J.; Lee, M.-K.; Jeong, M.Y.; Kim, C.-S. Polarization Dependence Suppression of Optical Fiber Grating Sensor in a π-Shifted Sagnac Loop Interferometer. Sensors 2010, 10, 4373-4380.

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