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29 November 2011Multilongitudinal-mode fiber laser temperature sensor and its
applications in the measurement of temperature dependence of fiber
birefringence
In this paper, an active temperature sensor based on beat frequency interrogation of a multilongitudinal-mode fiber laser
has been proposed and demonstrated. Temperature measurement has been achieved through beat frequency interrogation
of the proposed multilongitudinal mode laser. Experimental results show that the temperature sensing curve has good
linearity with a coefficient of determination of 0.996004 for a temperature range of 30°C to 105.3°C. Furthermore, its
application in the measurement of temperature dependence of fiber birefringence has been also investigated. And
calculation results according to experimental observation of the beat frequency spectrum indicate that as temperature
increases intrinsic fiber birefringence also linearly increases with a temperature coefficient of about 4.4x10-10/°C. The
proposed multilongitudinal-mode fiber laser sensor based on beat frequency interrogation has several advantages
including compactness, high signal to noise ratio, etc, which is expected to be employed in future sensing applications.
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Hao Zhang, Bo Liu, Yange Liu, Yinping Miao, Xingya Chen, Yunqi Liu, "Multilongitudinal-mode fiber laser temperature sensor and its applications in the measurement of temperature dependence of fiber birefringence," Proc. SPIE 8311, Optical Sensors and Biophotonics III, 83110Q (29 November 2011); https://doi.org/10.1117/12.902974