High coincidence-to-accidental ratio (CAR) is crucial for photon-pair sources (PPSs) integrated with pump reject filters (PRFs) in silicon, but CAR values currently reported for integrated PPS/PRF chips still fall short of those achieved using stand-alone sources with external PRFs. Here we report measured and modelled CAR values for a micro-ring resonator PPS integrated with a PRF consisting of a three-stage, cascaded (via their through ports), contra-directional coupler (CDC) that compare favorably even with some stand-alone sources. CDC-based PRFs provide the benefits of compact area and wide reject bands without a need for tuning, in comparison to prior-art implementations.

中文翻译：

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与硅微环谐振器光子对源集成的反向泵浦抑制滤波器

高巧合与意外比 (CAR) 对于集成在硅中的泵浦抑制滤波器 (PRF) 的光子对源 (PPS) 至关重要，但目前报告的集成 PPS/PRF 芯片的 CAR 值仍低于使用支架实现的值- 带有外部 PRF 的单独来源。在这里，我们报告了与 PRF 集成的微环谐振器 PPS 的测量和建模 CAR 值，该 PRF 由三级、级联（通过它们的直通端口）、对向耦合器 (CDC) 组成，即使与一些独立的器件相比也毫不逊色来源。与现有技术的实现方式相比，基于 CDC 的 PRF 具有面积小和抑制带宽的优点，无需调谐。