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

Sensors

Jaebum Son¹  Min-Kyoung Lee³  Myung Yung Jeong² 

[1] School of Medicine, Korea University, Seoul, 136-705, Korea; E-Mail:;W.C.U. Department of Cogno-Mechatronics, Pusan National University, Busan, 609-735, Korea; E-Mail:;Department of Physics, Chungnam National University, Daejeon, 305-764, Korea; E-Mail:

关键词: fiber sensor;    long-period fiber gratings;    sagnac effect;    polarization-sensitive devices;   

DOI  :  10.3390/s100504373

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2010 by the authors; licensee MDPI, Basel, Switzerland.