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通过石英圆柱模型,理论研究了小芯径光子晶体光纤中混合声波模式的色散、模式耦合以及声光相互作用,理论计算出了布里渊散射增益系数谱的双峰结构及其随抽运光波长和温度的演化规律.理论分析表明光子晶体光纤中布里渊散射增益系数谱的双峰结构源于小芯径光子晶体光纤中混合声波模式之间的模式耦合.通过温度改变导致的材料参数变化对声波模式色散特性的影响,特别是声波模式耦合点的移动,解释了双峰结构随外界温度的变化规律.并且,通过理论计算与实验结果的对比讨论了石英圆柱模型的局限性和适用范围.
Through the quartz cylinder model, the dispersion, mode coupling and the acousto-optic interaction of the mixed acoustic modes in a small diameter photonic crystal fiber are theoretically studied. The bimodal structure of the gain spectrum of Brillouin scattering and its relationship with the pumping light Wavelength and temperature.The theoretical analysis shows that the bimodal structure of Brillouin scattering gain spectrum in photonic crystal fiber originates from the mode coupling between the mixed acoustic modes in the small diameter photonic crystal fiber.The material parameters The influence of the variation on the dispersion characteristics of the acoustic mode, especially the movement of the coupling point of the acoustic mode, explains the variation law of the bimodal structure with the outside temperature.And the limitation and application of the quartz cylinder model are discussed by comparing the theoretical calculation with the experimental results range.