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

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

1
, 2
, 3
 and 3,*
Received: 23 March 2010; in revised form: 23 April 2010 / Accepted: 23 April 2010 / Published: 29 April 2010
(This article belongs to the Section Physical 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.
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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

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.

AMA Style

Son J, Lee M-K, Jeong MY, Kim C-S. Polarization Dependence Suppression of Optical Fiber Grating Sensor in a π-Shifted Sagnac Loop Interferometer. Sensors. 2010; 10(5):4373-4380.

Chicago/Turabian Style

Son, Jaebum; Lee, Min-Kyoung; Jeong, Myung Yung; Kim, Chang-Seok. 2010. "Polarization Dependence Suppression of Optical Fiber Grating Sensor in a π-Shifted Sagnac Loop Interferometer." Sensors 10, no. 5: 4373-4380.


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