O'Connor P, Tauc J
Appl Opt. 1978 Oct 15;17(20):3226-31. doi: 10.1364/AO.17.003226.
The coupling of scattered radiation from Raman-active core and cladding regions to the waveguide normal modes is analyzed by treating the scattered light as a classical incoherent effective source. Numerical results are presented for the limiting cases of single-mode or highly multimode excitation of the fiber. The effect of a finite frequency shift between the exciting and scattered fields is also considered. It is found that radiation produced by scattering of the evanescent field in the cladding is coupled to the guided modes with a peak efficiency of about one-fifth that of light scattered in the core. The implications of these effects for optical devices utilizing fibers are briefly discussed.
通过将散射光视为经典非相干有效源，分析了拉曼活性纤芯和包层区域的散射辐射与波导正常模式的耦合。给出了光纤单模或高多模激发极限情况下的数值结果。还考虑了激发场和散射场之间有限频移的影响。结果发现，包层中倏逝场散射产生的辐射与导模耦合，其峰值效率约为纤芯中散射光效率的五分之一。简要讨论了这些效应对于利用光纤的光学器件的意义。
