Tanaka T P, Yamada S, Sumi M, Mikoshiba K
Appl Opt. 1977 Sep 1;16(9):2391-4. doi: 10.1364/AO.16.002391.
The microbending of optical fibers causes some additional transmission losses. In this paper, the theoretical and experimental results on the microbending characteristics for doubly clad (W-type) fibers are described. A simple approximation in which W-type fibers are considered as equivalent singly clad fibers is employed to calculate the additional losses due to microbending. It is shown that the additional losses of W-type fibers depend on the optical wavelength. Further, it is shown that the structural imperfections of the guide can be also considered a kind of microbending which affects the spectral loss characteristics of W-type fibers.
光纤的微弯曲会导致一些额外的传输损耗。本文描述了关于双包层（W型）光纤微弯曲特性的理论和实验结果。采用一种简单的近似方法，即将W型光纤视为等效的单包层光纤，来计算微弯曲引起的额外损耗。结果表明，W型光纤的额外损耗取决于光波长。此外，还表明波导的结构缺陷也可被视为一种影响W型光纤光谱损耗特性的微弯曲。
