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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,*
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 Physical Sensors)
Download PDF [101 KB, 21 June 2014; original version 21 June 2014]

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.

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