Effect of multimodal coupling in imaging micro-endoscopic fiber bundle on optical coherence tomography.

Effect of multimodal coupling in imaging micro-endoscopic fiber bundle on optical coherence tomography.
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DOI:
10.1007/s00340-011-4847-y
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发表时间:
2012-01-14
影响因子:
2.1
通讯作者:
Kang, J. U.
Kang, J. U.
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Han, J. -H.;Kang, J. U.

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在光纤束成像的光学相干层析成像(OCT)的高阶模式的影响已被理论建模,使用耦合光纤模式分析忽略偏振和芯尺寸的变化,以可视化的成像束的多模耦合的纯效果。在该模型中,光学成像光纤耦合除了基模之外的几个高阶模,这是由于其高数值孔径用于实现对单个芯像素的光限制。这些模式在距离域中变得明显,使用A模式(深度)OCT,其基于反射镜样本实验,其中多个峰值由光源的空间卷积和相干函数生成。对应于每个模式的峰之间的距离可以通过考虑从数值求解光纤模式特性方程和光纤长度获得的耦合(引导)模式的有效折射率来估计。在152.5 mm(305 mm)长的成像光纤中,测量和分析的模式分离分别为715 μm(1404 μm)和764 μm(1527 μm)。
The effect of higher order modes in fiber bundle imager-based optical coherence tomography (OCT) has been theoretically modeled using coupled fiber mode analysis ignoring the polarization and core size variation in order to visualize the pure effect of multimodal coupling of the imaging bundle. In this model, the optical imaging fiber couples several higher order modes in addition to the fundamental one due to its high numerical aperture for achieving light confinement to the single core pixel. Those modes become evident in a distance domain using A-mode (depth) OCT based on a mirror sample experiment where multiple peaks are generated by the spatial convolution and coherence function of the light source. The distance between the peaks corresponding to each mode can be estimated by considering the effective indices of coupled (guided) modes obtained from numerically solving the fiber mode characteristics equations and the fiber length. The results have been compared for various types (fiber dimensions and wavelengths) and lengths of fibers, which have mode separation of 715 μm (1404 μm) and 764 μm (1527 μm) for the measurement and analysis, respectively in a 152.5 mm (305 mm)-long imaging fiber.
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