All-fiber common-path optical coherence tomography: Sensitivity optimization and system analysis
All-fiber common-path optical coherence tomography: Sensitivity optimization and system analysis
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DOI：
10.1109/jstqe.2005.857380
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发表时间：
2005-07-01
影响因子：
4.9
通讯作者：
Kang, JU
中科院分区：
文献类型：
--
作者：
Sharma, U;Fried, NM;Kang, JU
成功地实现了基于共光路干涉仪的光学相干层析成像(OCT)的全集成全光纤实现。与传统的基于迈克尔逊的OCT系统不同的是，由于参考信号是从探头端背向反射获得的，因此没有单独的参考臂。这导致了“下引线不敏感”，这使得该设备与现有的内窥镜医疗仪器更兼容。从理论上分析了平衡检测和非平衡检测中系统灵敏度的优化问题。我们进行了实验来验证我们的一些信噪比(SNR)分析，这些分析与理论非常吻合。有趣的是，我们的分析预测，与传统的OCT相比，共路OCT存在更高的拍频噪声。我们预测当使用平衡检测时，与非平衡检测相比，最大倾斜率极限仅有6分贝的改善。
A fully integrated all-fiber implementation of common-path interferometer-based optical coherence tomography (OCT) has been successfully demonstrated. Unlike conventional Michelson-based OCT systems,, there is no separate reference arm as the reference signal is derived from the probe-end back reflection. This leads to "downlead insensitivity," which makes the device more compatible with existing endoscopic medical instruments. We also theoretically analyze the optimization of system sensitivity in balanced and unbalanced detection. We have conducted experiments to confirm some of our signal-to-noise ratio (SNR) analysis, which are in excellent agreement with the theory. Interestingly, our analysis predicts existence of much higher beat noise in common-path OCT as compared with the conventional OCT. We predict a maximum tipper limit of only 6-dB improvement in the SNR when the balanced detection is used, as compared with the unbalanced detection.