阶跃型单模石英光纤中受激喇曼散射的模式分析

The Research of the SRS in Step Type Single Mode Quartz Optical Fiber

在以YAG倍频激光器为光源进行阶跃型单模石英光纤的受激喇曼散射实验中发现,随斯托克斯波级次的增高,产生的模式为光纤所能传输的最高阶模式。由于光纤中介质对不同的波长具有不同的色散效应,因此,要求形成导模的斯托克斯波能同时满足色散效应和受激喇曼位相匹配这两个条件,才能在光纤中传输。根据理论计算能够很好的解释实验现象。

In the step type single mode quartz optical fiber SRS experiment with YAG frequency multiplication laser as light source, we find that as the level of the Stokes wave increases, the mode produced is the highest that optical fiber can transmit. Because the medium of optical fiber has different dispersion effect on different wavelength, only if the Stokes wave to be guide mode is able to simultaneously meet the two conditions of dispersion effect and SRS phase match can it be transmitted in optical fiber. Experiments can be clearly explained on the basis of theoretically reckoning.