高性能的片上纳米激光器对通信、传感以及量子等领域的发展有着至关重要的意义。纳米激光器中高的光学限制因子可以保证更大的模式增益，实现更低的激光器阈值。首先阐明了借助物理气相沉积和原子层沉积制备Si₃N₄/WS₂/Al₂O₃三明治型纳米激光器阵列的工艺流程；构建了该纳米激光器的仿真模型，在仿真模型中对实际结构进行了简化并分析了Al₂O₃覆盖层厚度T、Si₃N₄微盘直径D和厚度H对光学限制因子的影响。光学限制因子随着Al₂O₃覆盖层T以及Si₃N₄微盘直径D的增加有先增加后减小的趋势，Si₃N₄微盘厚度H的减小也可以显著增加激光器的光学限制因子；最后展示了器件的荧光以及扫描电子显微镜的表征结果。该工作为集成光学芯片中可规模制备的高性能纳米激光器打下了良好基础。

Single-pixel imaging can reconstruct the image of the object when the light traveling from the object to the detector is scattered or distorted. Most single-pixel imaging methods only obtain distribution of transmittance or reflectivity of the object. Some methods can obtain extra information, such as color and polarization information. However, there is no method that can get the vibration information when the object is vibrating during the measurement. Vibration information is very important, because unexpected vibration often means the occurrence of abnormal conditions. In this Letter, we introduce a method to obtain vibration information with the frequency modulation single-pixel imaging method. This method uses a light source with a special pattern to illuminate the object and analyzes the frequency of the total light intensity signal transmitted or reflected by the object. Compared to other single-pixel imaging methods, frequency modulation single-pixel imaging can obtain vibration information and maintain high signal-to-noise ratio and has potential on finding out hidden facilities under construction or instruments in work.

为探究光强度调制/直接检测系统中神经网络非线性均衡器的最优结构，实现更优的光通信性能，通过搭建20 km的112 Gbps 四电平脉冲振幅调制无色散补偿的光传输系统，分析了多隐藏层循环神经网络均衡器在该系统中的误码率及算法复杂度性能。结果表明，在同一误码率阈值下，增加隐藏层层数可有效降低单个隐藏层中神经元的数目，从而降低均衡器的算法复杂度。但随着隐藏层数目的进一步增加，均衡器的收敛性能下降，导致误码率及复杂度性能的恶化。通过量化研究隐藏层数目对循环神经网络均衡器性能的影响，发现在112 Gbps容量和20 km传输距离下，2层隐藏层RNNE具有最优的误码率及算法复杂度性能。与单隐藏层均衡器相比，2层隐藏层均衡器在1×10^-3误码率阈值下算法复杂度降低23.3 %。