光波导相控阵激光雷达接收系统设计  

Design of Receiving System for Waveguide Optical Phased Array Lidar

作　　者：林亚俊 韩香娥[1] 

机构地区：[1]西安电子科技大学物理与光电工程学院,陕西西安710071

出　　处：《中国激光》2015年第B09期257-261,共5页Chinese Journal of Lasers

摘　　要：光学相控阵光束扫描方法不同于传统的平面镜等机械扫描手段，能够高速地完成无惯性自由寻址。AlGaAs光波导相控阵激光雷达具有扫描速度快、扫描角度大等优点，其大扫描角度和极快的扫描速度给接收系统的设计带来了困难。基于AlGaAs光波导相控阵扫描器件，设计了直接探测与外差探测两种接收系统并分析了其信噪比特性。在直接探测方案中，为减少背景噪声，采用多口径阵列接收光学系统，针对其弱回波信号选用雪崩光电二极管（APD）光电探测器；在外差探测方案中，针对其大扫描角度，采用艾里斑方法增大相干失配角，实现大角度相干探测。最后对两种方案的优缺点进行了比较。Optical phase array scanning method is different from traditional mechanical scanning method as well as flat mirror, which can achieve inertialess random-access. A1GaAs waveguide optical phased array lidar has highlighted advantages in scanning speed, sweep range, etc. But the advantages bring difficulties in designing receiving system. Based on the AlGaAs waveguide phased array scanning lidar system, we design a direct detection and a heterodyne detection of the receiving system and analyze their characteristics of signal noise ratio. In the direct detection solution, in order to reduce background noise, multi aperture array receiving optical system is used. Aiming at the weak echo signal, we choose avalanche photo diode （APD） photoelectric detectors. In the heterodyne detection solution, for its large scan angle, we use the Airy method to achieve big angle coherent detection. Finally, the advantages and disadvantages of the two solutions are compared.

关 键 词：激光光学 激光雷达 光学相控阵 外差探测 

分 类 号：TN95[电子电信—信号与信息处理]