分布式反馈激光器模拟控温检测系统研制

Development of analog temperature control and detection system for distributed feedback laser

温度对分布式反馈(DFB)激光器的性能指标和工作寿命有着重要影响。针对宽温度范围下的激光器应用,分析了激光器温控系统的研究现状及趋势,给出了温控系统的设计原理,采用线性驱动与PID闭环控制方法,应用模拟器件,研制了一种DFB激光器的模拟控温检测系统,并利用该系统对1550 nm的DFB激光器进行了试验验证。结果表明,系统在−55℃~70℃的全温度范围下,保持长时间工作(≥2 h),激光器的工作状态稳定,中心波长未出现漂移。系统的温度控制精度随着工作环境温度的范围不同而有所差异,在室温环境下可达到±0.02℃,在全温范围内控制精度在±0.8℃以内,跟踪误差小于±0.5 dB。与传统的激光器温控系统相比,本系统工作温度范围宽、控制精度高,且体积小、成本低、简单可靠,对于温度环境要求较为严苛的DFB激光器应用场景,具有重要的工程实践意义。

Temperature has an important influence on the performance index and working life of distributed feedback(DFB)laser.Aiming at the laser application in a wide temperature range,the research status and trend of laser temperature control system are analyzed,and the design principle is given.A simulated temperature control and detection system of DFB laser is developed by using linear drive and PID closed-loop control method and simulator,and the system is used to verify the 1550 nm DFB laser.The results show that the system could work for a long time(≥2 h)in the full temperature range of−55℃−70℃,the working state of the laser was stable,and the central wavelength did not drift.The temperature control precision of the system varies with the temperature range of the working environment.It can reach±0.02℃at room temperature within±0.8℃in the full temperature range,and the tracking error is less than±0.5 dB.Compared with the traditional laser temperature control system,the system has wider working temperature range,higher control precision,smaller volume,and lower cost,being simple and reliable.For the application of DFB laser with strict temperature environment requirements,it has important engineering practical significance.