空间光通信用量子点激光器辐射损伤效应研究

Radiation Damage Effect of Quantum Dot Laser with Space Optical Communication

摘要: 采用电子和质子辐射空间激光通信系统，选用1 310 nm量子点激光器，对其辐射损伤效应开展研究，给出了辐射前后器件的I-V和I-P等特性参数随辐射剂量的变化数据，并对主要结果进行了分析。结果表明，随着辐射剂量的增加，同一电流处的电压均随着辐射剂量呈上升趋势；量子点激光器阈值电流逐渐增大，同时，在同一驱动电流下，光功率逐渐减小，斜率效率下降；当电子和质子的辐射剂量分别超过1×10⁷rad和8×10⁵rad之后，阈值电流增加和斜率效率的下降趋势都变缓。

Abstract: In order to evaluate the applicability of quantum dot lasers in space radiation environment, the radiation damage effect of 1 310 nm quantum dot lasers in space laser communication system irradiated by electrons and protons is studied.The I-V and I-P characteristic parameters of the device before and after irradiation are given, and the main results are analyzed.The results show that with the increase of radiation dose, the voltage at the same current increases with the irradiation dose, the threshold current of quantum dot laser increases gradually, and at the same driving current, the optical power decreases gradually, and the slope efficiency decreases.When the radiation doses of electron and proton exceed 1×10⁷rad and 8×10⁵rad respectively, the decreasing trend of threshold current and slope efficiency becomes slower.