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Wavelength dependence of stress-induced time of flight variations in graded-index multimode fibers

机译：渐变折射率多模光纤中应力引起的飞行时间变化的波长依赖性

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摘要

We investigate the wavelength dependence of stress-induced time of flight variations in graded-index multimode fibers (GI-MMFs) for wavelength lambda = 1.26 mu m similar to 1.58 mu m, theoretically and experimentally. Calculations were made based on simple equations using the refractive index of silica fibers. We measured the wavelength dependence of stress-induced time of flight variations by a newly proposed measurement method. We confirmed the similar wavelength dependence of GI-MMFs to that for standard single mode fibers (SSMF). However, the value of them is different. We compare the experimental and theoretical results for two types of fibers. The comparison indicates that the difference of stress-induced time of flight variations between two types of fibers is mainly due to the group velocity difference. We conclude that there is no significant difference of the photo-elastic constant between the measured SSMFs and GI-MMFs. Although many properties of GI-MMFs depended on the mode power distribution in general, we conclude the dependence of stress-induced time of flight variations on mode power distribution is small for the measured fibers. (C) 2015 Elsevier Inc. All rights reserved.
机译：我们在理论上和实验上研究了波长为λ= 1.26μm（类似于1.58μm）的渐变折射率多模光纤（GI-MMFs）中应力引起的飞行时间变化的波长依赖性。使用二氧化硅纤维的折射率，基于简单的方程式进行计算。我们通过新提出的测量方法测量了应力引起的飞行时间变化的波长依赖性。我们证实了GI-MMF与标准单模光纤（SSMF）具有相似的波长依赖性。但是，它们的价值是不同的。我们比较了两种纤维的实验和理论结果。比较表明，两种类型的纤维之间应力引起的飞行时间变化的差异主要归因于群速度差异。我们得出的结论是，在测得的SSMF和GI-MMF之间，光弹性常数没有显着差异。尽管GI-MMF的许多特性通常取决于模式功率分布，但我们得出结论，对于被测光纤，应力引起的飞行时间变化对模式功率分布的依赖性很小。 （C）2015 Elsevier Inc.保留所有权利。

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