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Refractive index retrieving of polarization maintaining optical fibers

机译：保偏光纤的折射率检索

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摘要

In this paper, the cross-section images, of two different types of polarization maintaining (PM) optical fibers, are employed to estimate the optical phase variation due to transverse optical rays passing through these optical fibers. An adaptive algorithm is proposed to recognize the different areas constituting the PM optical fibers cross-sections. These areas are scanned by a transverse beam to calculate the optical paths for given values of refractive indices. Consequently, the optical phases across the PM optical fibers could be recovered. PM optical fiber is immersed in a matching fluid and set in the object arm of Mach-Zehnder interferometer. The produced interferograms are analyzed to extract the optical phases caused by the PM optical fibers. The estimated optical phases could be optimized to be in good coincidence with experimentally extracted ones. This has been achieved through changing of the PM optical fibers refractive indices to retrieve the correct values. The correct refractive indices values are confirmed by getting the best fit between the estimated and the extracted optical phases. The presented approach is a promising one because it provides a quite direct and accurate information about refractive index, birefringence and beat length of PM optical fibers comparing with different techniques handle the same task.
机译：在本文中，采用两种不同类型的保偏（PM）光纤的横截面图像来估算由于横向光线穿过这些光纤而引起的光学相位变化。提出了一种自适应算法来识别构成PM光纤横截面的不同区域。这些区域被横光束扫描以计算给定折射率值的光路。因此，可以恢复穿过PM光纤的光相。将PM光纤浸入匹配的液体中，然后放置在Mach-Zehnder干涉仪的物镜臂中。分析产生的干涉图以提取由PM光纤引起的光学相位。可以优化估计的光相位，使其与实验提取的光相位非常吻合。这是通过改变PM光纤的折射率以获取正确的值来实现的。正确的折射率值通过在估计的光学相位和提取的光学相位之间获得最佳拟合来确认。提出的方法是一种有前途的方法，因为与使用相同技术的不同技术相比，它提供了有关PM光纤的折射率，双折射和拍长的相当直接和准确的信息。

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