以红外分布反馈激光器激发光源为核心的检测装置中, 分布反馈激光器发光波长的控制精度及稳定性直接决定检测装置测量准确性。为此研发了一种采用模拟PID控制的分布反馈激光器温度控制系统。该系统采用模拟比例-积分-微分温度前向控制模块和温度实时后向采集模块达到控制温度的目的。温度控制实验中采用激射中心波长为2 049 nm的分布反馈激光器, 结果表明, 系统温度控制稳定性为±0.05 ℃, 稳定时间小于30 s。同时, 利用所研制的温度控制系统对上述可调谐DFB激光器做了光谱测试实验, 结果表明, 当激光器驱动电流固定时, 激光器激射波长与其工作温度呈线性关系。

The control precision and stability of emitting wavelength of distributed feedback laser directly determines the measurement accuracy of detection system that uses infrared distributed feedback laser excitation light source as the core section. A temperature control system of distributed feedback laser was developed utilizing analog PID control. Simulated proportional-integral-differential temperature forward control module and real-time temperature backward acquisition module were adopted to control temperature. Emitting wavelength of 2 049 nm DFB laser was used in temperature control experiment. Results show that system temperature control stability is ±0.05 ℃, and the stability time is less than 30 s. Meanwhile, spectrum test experiment was conducted using the developed temperature control system to control the proposed distributed feedback laser. The results show that the emitting wavelength of laser is linear with its working temperature while the laser drive current is fixed.