Li Yongqian, Zhao Xu, Zhao Lijuan. Analysis and calculation of Brillouin scattering angle and frequency shift in multimode optical fibers[J]. 2014,(6):38-41.
Li Yongqian, Zhao Xu, Zhao Lijuan. Analysis and calculation of Brillouin scattering angle and frequency shift in multimode optical fibers[J]. 2014,(6):38-41. DOI: 10.13756/j.gtxyj.2014.06.011.
To determine the value range of Brillouin shift in multimode fibers and evaluate the performances of Brillouin scattering-based distributed sensing system
this paper first describes the fiber structures and analyzes the Brillouin scattering process in them on the basis of ray optics theory.Then it proposes a method for determining the value range of Brillouin scattering angle.In this method
it determines that the Brillouin scattering angle in step-index and graded-index multimode fibers is in the range of twice of the critical angle of total reflection toπ
and that the Brillouin shift varies in the range of 10.978
1
1.083 GHz.This conclusion provides a forceful theoretical basis for the design and optimization of the distributed Brillouin sensing system for multimode fibers.