光纤中声波导布里渊散射声波对斯托克斯波的影响

Influence of Acoustic Wave on Stokes Wave of Guide Acoustic Wave Brillouin Scattering in Fibers

利用全矢量有限元法模拟了单模光纤中声波导布里渊散射R0,m和TR2,m声波模式对斯托克斯波增益、相位调制和双折射的影响.研究结果表明:当布里渊频移与R0,8和TR2,10声波频率相同时,斯托克斯波的增益最大,且增益随泵浦功率的增大而增大;R0,1、TR2,1、TR2,5、TR2,7和TR2,10声波模式对斯托克斯波相位调制较大,且相位调制随泵浦功率的增大呈线性增大,其中TR2,m模对斯托克斯波相位调制比R0,m模大;TR2,1、TR2,5、TR2,7、TR2,10声波模式对斯托克斯波产生较为明显的附加双折射,且附加双折射程度随着泵浦功率的增加呈线性增大.

The effects of R0,m and TR2.m acoustic modes of guided acoustic wave Brillouin scattering on gain, phase modulation and additional hirefringence in single mode fiber were investigated by the all- vector finite element method. The results show that the gain of guided acoustic wave Brillouin scattering reaches maximum at their frequencies matching those of R0.8 and TR2.10 modes in R0. m and TR2.m （0°/90°） mode, and the gain increases with the increasing of pump power. The Stokes wave phases modulated obviously by R0.1 , TR2.5, TR2.7 and TR2.10 modes, where TR2. m mode plays a vital role in the phase modulation which linearly increases with the increasing of pump power. TR2.1, TR2.5, TR2.7, TR2.10 modes obviously induce additional birefringence which linearly increase with pump power increasing.