基于国产芯片的千兆皮秒脉冲激光器模块研制

皮秒脉冲光源是量子密钥分配系统核心器件。为了实现皮秒脉冲光源的国产化，基于国产芯片研制了一种千兆皮秒脉冲激光器模块。该模块采用比例-积分-微分算法控制温度，使光波长漂移在0.01nm以内，使用外部光电二极管探测光功率，反馈调整激光管驱动电流，进行了实验验证。结果表明，利用国产单片机精确控制恒流源和窄脉冲电路驱动激光管发光，输出光脉冲频率达到1.25GHz，脉冲宽度约为50ps，光功率为-3dB对应的谱宽小于0.2nm，输出光波长和功率稳定。此研制的国产化皮秒脉冲激光器模块可满足量子密钥分配系统对光源稳定性的要求。

Design of a gigahertz picosecond pulse laser module based on domestic chips

Picosecond pulse light source is the core device of a quantum key distribution system. In order to realize the localization of picosecond pulse light source, a gigahertz picosecond pulse laser module was developed based on domestic chips. The module was fabricated by using proportion integration division algorithm to control the temperature so that the wavelength drifts within 0.01nm. The external positive intrinsic negative tube was used to detect the light power, and the driving current of the laser diode was adjusted by feedback. In the meantime, experiments were carried out to verify the theoretical results. The results show that the constant current source and short pulse circuit are controlled accurately by domestic microcontroller to drive the laser diode. The output light pulse frequency can reach 1.25GHz, and the pulse width is about 50ps. When the optical power is -3dB, the spectral width is less than 0.2nm, and the output light wavelength and power is stable. The picosecond pulse laser module of localization can meet the requirements of quantum key distribution system for light source stability.