A highly-birefringent fiber loop mirror temperature sensor demodulation based on a long-period grating in photonic crystal fiber with differential processing

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Abstract

A highly-birefringent fiber loop mirror temperature sensor demodulation based on a long-period grating (LPG) in photonic crystal fiber (PCF) with differential processing was proposed.Utilizing the property temperature insensitive and the filtering function of the LPG in PCF, the intensities of two signals located respectively within the positive and negative linear region of the LPG's transmission spectrum can be monitored simultaneously and accurately. The noise of fiber sensors is eliminated effectively by the algorithm of two signals, since the two signals (also including the noise of fiber sensors) transmit through the same way to the monitor. Experimental results show that the value of the algorithm remains constant when the power of light source varies ±10% and the relative error between the measured temperature change and the true change is only 0.34%. Compared with the sensing without the algorithm, the accuracy increases from∼97.3 to ∼99.7%. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:176–179, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26460

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