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Optical time-domain reflectometry of bent plastic optical fibers

机译：弯曲塑料光纤的光学时域反射法

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摘要

Optical time-domain reflectometry (OTDR) signals of step-index plastic optical fibers (POF's) and graded-index POF's were measured with a laser diode and an avalanche photodiode. When bent step-index and graded-index POF's were used, the OTDR signal behavior differed. The OTDR signal of the bent graded-index POF's had a step that corresponds to a curvature loss, but the step-index POF's had a spike signal at a bend, which indicated the occurrence of backscattering. The peak intensity was proportional to the square of the curvature. The refractive-index variation of the bent step-index POF's was measured, and the dependence of the peak intensity on the curvature was shown to agree with that predicted by the scattering from the refractive-index perturbation.
机译：用激光二极管和雪崩光电二极管测量阶跃折射率塑料光纤（POF's）和渐变折射率POF的光时域反射（OTDR）信号。当使用弯曲阶跃索引和渐变索引POF时，OTDR信号的行为会有所不同。弯曲的渐变折射率POF的OTDR信号具有对应于曲率损耗的阶跃，但是阶跃折射率POF的弯曲处具有尖峰信号，表明发生了反向散射。峰值强度与曲率的平方成正比。测量了弯曲阶跃折射率POF的折射率变化，并且表明峰强度对曲率的依赖性与由折射率扰动的散射所预测的相符。

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