Rich T C, Pinnow D A
Appl Opt. 1974 Jun 1;13(6):1376-8. doi: 10.1364/AO.13.001376.
Optical scattering loss in fiber optical waveguides is the sum of the bulk material scattering and excess scattering loss due to imperfections in the waveguide structure. The recently developed Brillouin spectroscopic technique for evaluating bulk scattering has been extended to fiber waveguides, and a detailed investigation has been performed on a borosilicate clad-pure fused silica core waveguide. The technique has been found to be useful in evaluating scattering due to waveguide imperfections that have been determined to occur at the core-cladding interface. In addition to providing a measure of the waveguide scattering loss, the Brillouin technique has also been found to be useful in determining the molar composition of the borosilicate cladding glass and the partition of guided optical power between the core and cladding regions. The unusual capabilities of this technique should make it generally useful for characterizing integrated optical structures.
光纤光波导中的光散射损耗是体材料散射与由于波导结构缺陷导致的额外散射损耗之和。最近开发的用于评估体散射的布里渊光谱技术已扩展到光纤波导，并对硼硅酸盐包层 - 纯熔融石英芯波导进行了详细研究。已发现该技术在评估由已确定发生在芯 - 包层界面处的波导缺陷引起的散射方面很有用。除了提供波导散射损耗的测量值外，布里渊技术还被发现可用于确定硼硅酸盐包层玻璃的摩尔组成以及芯区和包层区之间导光功率的分配。该技术的非凡能力应使其普遍适用于表征集成光学结构。
