任意折射率分布光纤弯曲损耗理论模型的改进  

Improvement of the theoretical model of optical fibers' bending loss with arbitrary-index profile

作　　者：章元[1] 曹斌照[1] 孙鉴 

机构地区：[1]兰州大学信息科学与工程学院,兰州730000 [2]甘肃省医学科学院放射科,兰州730000

出　　处：《兰州大学学报（自然科学版）》2009年第3期137-139,144,共4页Journal of Lanzhou University(Natural Sciences)

基　　金：甘肃省自然科学基金项目(0710RJZA022)

摘　　要：对传统的任意折射率分布光纤的弯曲损耗理论模型进行了修正,着重考虑了应力对折射率的影响。通过对LP_(01)模的数值计算,验证了该修正结果的正确性。利用改进后的理论对两种典型折射率分布光纤的弯曲损耗随弯曲半径的变化规律进行了分析。结果表明:改进后的理论模型的计算值与理论值吻合得更好,特别是在弯曲半径较小时优势更明显。该研究结果为分析任意折射率分布光纤在强弯曲状态下的导光特性提供了一定的参考依据。In consideration of the influence of internal stress on the refractive index of bending fiber, some modifications were done to the traditional theoretical model of optical fibers＇ bending loss with arbitraryindex profile. The correctness of these modifications was verified by calculating the LP01 mode. The improved model was thereafter employed to analyze the variation characteristics of two typical refractive index profile optical fibers＇ bending loss with different bending radius. The calculated values of improved theoretical model coincided better with the theoretical values, especially for a smaller bending radius. These results provide reference for the analysis of the transmission characteristics of light in a strong bending arbitrary-index profile fiber.

关 键 词：任意折射率分布光纤 弯曲损耗 内应力 阶梯近似 

分 类 号：TN015[电子电信—物理电子学]