基于光子集成电路的多通道扫频光源光学相干层析成像概念
Multi-channel swept source optical coherence tomography concept based on photonic integrated circuits
摘要：
本文提出了一种基于光子集成电路的多通道扫频光源光学相干层析成像系统。该概念的核心是低损耗偏振相关路径路由方法，与先前示出的基于PIC的OCT系统相比，该方法允许更低的过量损耗，从而促进测量单元的并行化。作为低损耗路径路由的概念证明，实现了在840 nm处操作的基于氮化硅PIC的单通道扫频源OCT系统，并用于获取人视网膜的体内断层图像。PIC的制造是通过CMOS兼容的等离子体增强化学气相沉积完成的，以允许未来与光电二极管和读出电子器件的单片共集成。使用所实现的光子构建块的结果的性能分析示出了与具有相同信噪比的理想无损单通道系统相比，多通道系统的采集速度的潜在十倍增加。
英文摘要：
In this paper, we present a novel concept for a multi-channel swept source optical coherence tomography (OCT) system based on photonic integrated circuits (PICs). At the core of this concept is a low-loss polarization dependent path routing approach allowing for lower excess loss compared to previously shown PIC-based OCT systems, facilitating a parallelization of measurement units. As a proof of concept for the low-loss path routing, a silicon nitride PIC-based single-channel swept source OCT system operating at 840 nm was implemented and used to acquire in-vivo tomograms of a human retina. The fabrication of the PIC was done via CMOS-compatible plasma-enhanced chemical vapor deposition to allow future monolithic co-integration with photodiodes and read-out electronics. A performance analysis using the results of the implemented photonic building blocks shows a potential tenfold increase of the acquisition speed for a multi-channel system compared to an ideal lossless single-channel system with the same signal-to-noise ratio.
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