Three-dimensional refractive index reconstruction of optical fibers based on single-element interferometer computed tomography
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摘要: 提出了一种基于单元件干涉仪的计算机断层扫描方案，用于测量光纤三维折射率分布。该单元件干涉仪基于显微成像的原理，提高了系统的横向分辨率。利用快速傅里叶变换提取相位，采用滤波反投影算法重建了光纤的折射率分布。搭建了实验测量装置，实际测量了单模和多模光纤的折射率分布。结果表明，提供的方法可以简单快速地得到全光场数据，同时具有无损和非接触的优点，并且光路结构紧凑稳定，可为计算机断层扫描设备的小型化提供一种新的思路。Abstract: A computer tomography scheme based on single-element interferometer is proposed to measure the three-dimensional refractive index distribution of optical fiber. Based on the principle of microscopic imaging, the single-element interferometer improves the lateral resolution of the system. The phase is extracted by fast Fourier transform, and the refractive index distribution of the fiber is reconstructed by filtered back projection algorithm. Based on the proposed scheme, an experimental measurement device is built to actually measure the refractive index distribution of single-mode and multimode optical fibers. The results show that the measurement can simply and quickly obtain the full optical field data, has the advantages of being lossless and non-contact, and the optical path structure is compact and stable, which provides a new idea for the miniaturization of computed tomography equipment.
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图 1 基于单元件干涉的显微断层成像的光纤折射率测量
Figure 1. Optical fiber refractive index measurement of micro tomography based on unit interference
图 2 单模光纤、多模光纤、熊猫型保偏光纤和柚子型光子晶体光纤在θ=0o，22.5o，45o，90o时的仿真投影积分
Figure 2. Simulation projection integrals of single-mode fiber, multi-mode fiber, panda-type polarization-maintaining fiber and grapefruit-type photonic crystal fiber at θ=0o, 22.5o, 45o, 90o
图 3 单模光纤、多模光纤、熊猫型保偏光纤和柚子型光子晶体光纤在不同投影数量和角度下的正弦图
Figure 3. Sinograms of single-mode fiber, multi-mode fiber, panda-type PM fiber, and grapefruit-type photonic crystal fiber at different numbers of projections and angles
图 4 根据图3中正弦图反投影出的光纤折射率分布
Figure 4. Refractive index distribution of the fiber according to the back-projection of the sinogram in Fig. 3
图 5 单模光纤、多模光纤的干涉图、相位分布和三维显示
Figure 5. Interferogram, phase distribution 3D display of single-mode and multi-mode fibers
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