Optical coherence tomography (OCT) is a promising imaging modality for clinical. Its certain limitations such as size and complexity are rather challenging wherein exploiting integrated optics provide benefits over reduced size and lesser complexity. We have designed and reported a broadband and low loss linearly tapered directional coupler as a substitute to replace bulky beam splitter that are deployed currently in OCT systems. The reported structure has a small footprint and broadband over 100 ​nm bandwidth with an excess loss of 0.059 ​dB ​at 1330 ​nm central wavelength. The structure designed on silicon nitride platform upon integration with other components will provide a miniaturized OCT system.

光学相干断层扫描（OCT）是一种有前途的临床成像方式。它的某些限制（例如大小和复杂性）颇具挑战性，其中利用集成光学器件提供的好处是尺寸减小和复杂性降低。我们已经设计并报告了宽带低损耗线性锥形定向耦合器，以替代目前在OCT系统中部署的笨重的分束器。报告的结构具有较小的覆盖区和100纳米带宽以上的宽带，在1330纳米中心波长处的额外损耗为0.059 dB。与其他组件集成后，在氮化硅平台上设计的结构将提供小型化的OCT系统。