Polarization dependence suppression of optical fiber grating sensor in a π-shifted sagnac loop interferometer

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

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Son, J., Lee, M. K., Jeong, M. Y., & Kim, C. S. (2010). Polarization dependence suppression of optical fiber grating sensor in a π-shifted sagnac loop interferometer. Sensors, 10(5), 4373–4380. https://doi.org/10.3390/s100504373

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