论文标题
照片热效应石墨烯检测器具有105 GBIT S-1 NRZ和120 GBIT S-1 PAM4直接检测
Photo Thermal Effect Graphene Detector Featuring 105 Gbit s-1 NRZ and 120 Gbit s-1 PAM4 Direct Detection
论文作者
论文摘要
下一代Datacom和电信通信的挑战是增加可用的带宽，同时减少光子集成电路的大小，成本和功耗。硅（SI）光子学已成为达到这些目标的可行解决方案。石墨烯是一种单原子厚的碳5层，由于其非常高的迁移率，快速载体动力学和超宽带光学特性，因此最近提议将其与Si Photonics集成。在这里，我们专注于用于高速数据库和电信应用程序的石墨烯光电探测器。到目前为止，已经证明了高速石墨烯光电探测器，但是最多的是基于光下仪（PB）或光电传导性（PC）效应。这些设备的特征是大黑电流，按照毫米的顺序，这是照片录像机设计的损害，照片 - 热电动（PTE）效应已被确定为用于光检测的替代现象。基于PTE的光电电视机的主要优点是电压转换，零偏置操作和超快速响应的光功率。在文献中已经报道了基于石墨烯PTE的光电探测器，但是尚未显示高速光信号检测。在这里，我们报告了一个优化的基于石墨烯PTE的光电探测器，其平坦频率响应高达65 GHz。多亏了优化的设计，我们演示了系统测试，导致直接检测105 GBIT S-1非回报至零（NRZ）和120 GBIT S-1 4级脉冲振幅调制（PAM）光学信号
The challenge of next generation datacom and telecom communication is to increase the available bandwidth while reducing the size, cost and power consumption of photonic integrated circuits. Silicon (Si) photonics has emerged as a viable solution to reach these objectives. Graphene, a single-atom thick layer of carbon5, has been recently proposed to be integrated with Si photonics because of its very high mobility, fast carrier dynamics and ultra-broadband optical properties. Here, we focus on graphene photodetectors for high speed datacom and telecom applications. High speed graphene photodetectors have been demonstrated so far, however the most are based on the photo-bolometric (PB) or photo-conductive (PC) effect. These devices are characterized by large dark current, in the order of milli-Amperes , which is an impairment in photo-receivers design, Photo-thermo-electric (PTE) effect has been identified as an alternative phenomenon for light detection. The main advantages of PTE-based photodetectors are the optical power to voltage conversion, zero-bias operation and ultra-fast response. Graphene PTE-based photodetectors have been reported in literature, however high-speed optical signal detection has not been shown. Here, we report on an optimized graphene PTE-based photodetector with flat frequency response up to 65 GHz. Thanks to the optimized design we demonstrate a system test leading to direct detection of 105 Gbit s-1 non-return to zero (NRZ) and 120 Gbit s-1 4-level pulse amplitude modulation (PAM) optical signals
