Sheu Fang-Wen, Jhang Heng-Jian
Department of Electrophysics, National Chiayi University, Chiayi 60004, Taiwan.
Opt Express. 2013 Jan 28;21(2):2408-13. doi: 10.1364/OE.21.002408.
We focused partially coherent laser light onto an optical fiber end-face and captured a high-quality reflective cross-sectional image of the fiber. By analyzing the reflected light intensity distribution of the captured fiber image, we can achieve refractive-index profiling of a step-index multimode optical fiber. The measurement error caused by the reflected light from the other fiber end-face positioned in air can be greatly improved by inserting that end of the fiber into water. This simple and easy technique for fiber index profiling by employing reduced-coherence laser light is very useful in determining the refractive index profiles of various multimode optical fibers.
我们将部分相干激光聚焦到光纤端面上，并获取了该光纤的高质量反射横截面图像。通过分析所捕获的光纤图像的反射光强度分布，我们可以实现阶跃折射率多模光纤的折射率分布测量。将光纤的另一端插入水中，可以大大减小位于空气中的另一端面反射光所引起的测量误差。这种利用低相干激光进行光纤折射率分布测量的简单易行技术，对于确定各种多模光纤的折射率分布非常有用。
