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发明授权
CN108645344B 一种基于法布里-珀罗干涉的空芯光子晶体光纤纤芯尺寸测量装置及方法 有权

一种基于法布里-珀罗干涉的空芯光子晶体光纤纤芯尺寸测量装置及方法
摘要：
本发明公开了一种基于法布里‑珀罗干涉的空芯光子晶体光纤纤芯尺寸测量装置及方法，属于光纤特征参数测试领域，所述装置包括扫频激光器、1×2光纤耦合器、光纤准直器、待测光纤、探测器和示波器。光纤准直器的出射光射入待测光纤纤芯平行的空气‑SiO2界面作为法布里‑珀罗干涉腔；扫频激光器扫频，准直光在干涉腔内形成反射，反射光谱原路返回到达探测器，干涉光强转化成电压信号传递给示波器，拟合得到法布里‑珀罗干涉腔的距离；旋转待测光纤测得完整的纤芯尺寸；调整光纤准直器，使其沿待测光纤的轴向依次等距离移动，测得不同位置纤芯的大小进而评估纤芯的均匀性。本发明无损测量，装置简单且成本低，具有高灵敏度和分辨率，有利于工程化应用。
摘要（英）：

The nondestructive determination of core size of a hollow-core photonic bandgap fiber (HC-PBF) using Fabry-Perot (FP) interference is performed with an apparatus including a tunable laser source (TLS), a 1×2 single-mode (SM) coupler, an SM collimator, a six-axis translation stage, an optical detector, and an oscilloscope. The light from the TLS passes through the 1×2 SM coupler and the SM collimator to perpendicularly enter two parallel air-SiO2 interfaces of the core of the fiber and is reflected, while the TLS is tuned from one wavelength to another. Then the reflected spectrum is guided to the optical detector, where its interference intensity is converted into voltage intensity to be displayed at the oscillator and fitted with a least-squares method to obtain the distance between the two air-SiO2 interfaces. The core size of the fiber can be obtained by rotating the fiber and repeating the procedure at multiple angular positions.

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