Novel distributed birefringence measurement based on transient Brillouin grating in polarization-maintaining fibers and its application in sensing

Yongkang Dong; Xiaoyi Bao; Liang Chen; Yuelan Lv

doi:10.1117/12.848675

14 October 2009 Novel distributed birefringence measurement based on transient Brillouin grating in polarization-maintaining fibers and its application in sensing

Yongkang Dong, Xiaoyi Bao, Liang Chen, Yuelan Lv

Author Affiliations +

Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 75037Y (2009) https://doi.org/10.1117/12.848675
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom

Abstract

We propose a novel distributed birefringence measurement method based on transient Brillouin grating (TBG) in a polarization-maintaining (PM) fiber, which uses two short pump pulses to excite a TBG and a long probe pulse to map the transient Brillouin grating spectrum (TBGS) associated with the local birefringence. In experiment, the distributed birefringence of a 7-m Bow-tie PM fiber is measured, and the results show that it exhibits a periodical change with a period of ~ 3 m and variation amplitude of 1.6×10^-6 along the entire fiber. In addition, based on the birefringence variation we also realize distributed temperature sensing using a PM photonic crystal fiber with a spatial resolution of 20 cm and a temperature measurement range of a few hundreds degrees Celsius with 2 ns pump pulses, and a temperature resolution of 0.07 °C with a 6 ns probe pulse.

Citation Download Citation

Yongkang Dong, Xiaoyi Bao, Liang Chen, and Yuelan Lv "Novel distributed birefringence measurement based on transient Brillouin grating in polarization-maintaining fibers and its application in sensing", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75037Y (14 October 2009); https://doi.org/10.1117/12.848675

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