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 birefringence 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.