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A measurement study of refractive-index profile of an optical fiber

机译：光纤折射率分布的测量研究

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摘要

A novel transmitted-light differential interference contrast(DIC)system is used for nondestructive measurement of the refractive-index profile(RIP) of an optical fiber. By means of this system the phase of a measured light beam can be modulated with an analyzer. and the phase distribution of a fiber is obtained by calculation of the various interference patterns. The measurement theory and structure and some typical applications of this system are demonstrated. The results of measuring RIPs in graded-index are presented. Both the experimental results and theoretical analysis show that the system takes the advantage and high index resolution and of sufficient measurement analysis show that the system takes the advantage of high index of the optical fiber. The system has strong ability to overcome environmental disturbance because of its common-path design. Moreover, one can use the system to measure the RIP along the fiber axis and acquire an image of the three-dimensional RIP of the fiber.
机译：一种新型的透射光微分干涉对比（DIC）系统用于光纤的折射率分布（RIP）的无损测量。通过该系统，可以用分析仪来调制被测光束的相位。通过计算各种干涉图来获得光纤的相位分布。演示了该系统的测量原理和结构以及一些典型的应用。给出了按等级指数测量RIP的结果。实验结果和理论分析均表明该系统具有高折射率分辨率的优点，而充分的测量分析表明该系统具有光纤高折射率的优点。该系统具有通用路径设计，因此具有克服环境干扰的强大能力。而且，可以使用该系统沿纤维轴测量RIP并获取纤维三维RIP的图像。

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