Analysis and Application on Characteristic of Twisted High Birefringence Fiber Grating
CAI Lu-lu1,2,3,WAN Yu-liang2,3,WU-Fei1,2
1.College of Electrical and Information Engineering, Quzhou University, Quzhou, Zhejiang 324000, China
2.School of Electrical Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
3. Key Laboratory of Measurement Technology and Instrumentation of Hebei Province,Yanshan University, Qinhuangdao, Hebei 066004, China
Abstract：Through analysis on the characteristic of twisted high birefringence fiber grating, a novel torsion sensor which can be embeded in the engineering material is proposed. Based on the coupled mode theory and thecharacteristic of twisted high birefringence fiber, the mathematical model of twisted high birefringence fiber grating transmission light is established and the spectral characteristics is analyzed, the simulation results show that the reflective spectra of twisted high birefringence fiber grating does not have the direction, and is only related to the torsion angle size.When the twist angle changes from 0 to 360°, the two peak wavelength of high birefringence fiber grating are resulting in drift, light of x direction moved to the short wavelength direction, light of y direction moved towards long wavelength, and the reflection spectrum peak decreases gradually, through combining the prior to the coupled mode theory with the reverse coupled mode theory, analyzing and simulating,the conclusion that x and y directions wave peak variation are drew, and the center wavelength changes corresponding amount, finally make a validated through experimental data of the relationship between changes of parameters of high birefringence fiber grating and torsional angle.
2016, Vol. 37 
