Radiation Damage Effect of Quantum Dot Laser with Space Optical Communication

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.