DFB半导体激光器电流波长调谐线性度分析与校准  

Analysis and calibration of current wavelength tuning linearity of DFB semiconductor laser

作　　者：白建胜 张丕状[1] 戚俊成 贾宇杰 张扬[1] 牛瑞兴 Bai Jiansheng;Zhang Pizhuang;Qi Juncheng;Jia Yujie;Zhang Yang;Niu Ruixing(Shanxi Key Laboratory of Signal Capturing and Processing,North University of China,Taiyuan 030000,China)

机构地区：[1]中北大学信息探测与处理山西省重点实验室,太原030000

出　　处：《电子测量技术》2021年第8期168-174,共7页Electronic Measurement Technology

基　　金：山西省高等学校科技创新项目(2020L0274);中北大学研究生科技基金项目(20201727)资助。

摘　　要：分布反馈半导体激光器的调谐特性是制约TDLAS(可调谐半导体激光吸收光谱)技术测量性能的因素之一。针对目前DFB激光器存在固有的波长调谐非线性问题,提出了基于多项式拟合电流预校准算法的调谐非线性校准方法。首先,搭建了激光器电流波长测量系统,实测了电流波长关系并对线性度进行分析,基于多项式拟合算法推导注入电流预校准数学模型。其次,分析了多项式拟合算法拟合效果,通过比较各阶拟合多项式的MSE值(均方误差)和收敛特性,选择了二次多项式作为校准函数。实验结果表明,相比未校准状态,基于多项式拟合电流预校准算法使校准后的MSE值有大幅度降低。其中,对较优的二次多项式拟合算法进行激光器调谐非线性误差分析,相比校准前15.39%,校准后降低至2.27%,验证了该校准方法能够大幅提高DFB半导体激光器电流波长调谐的线性度。The tuning characteristics of diode lasers in TDLAS(Tunable Diode Laser Absorption Spectroscopy)technology is one of the factors that restrict the measurement performance of the system.Aiming at the inherent wavelength tuning nonlinearity of current DFB lasers,a tuning nonlinearity calibration method based on polynomial fitting current pre-calibration algorithm was proposed.Firstly,the laser current wavelength measurement system was built,the current wavelength relationship was measured and the linearity was analyzed,and the injection current pre-calibration mathematical model was deduced based on polynomial fitting algorithm.Secondly,the fitting effect of polynomial fitting algorithm was analyzed.By comparing MSE value(mean square error)and convergence characteristics of each order fitting polynomial,quadratic polynomial was selected as calibration functions.Experimental results show that compared with the uncalibrated state,the pre-calibration algorithm based on polynomial fitting current greatly reduces the calibrated MSE value.Among them,the laser tuning nonlinear error analysis was performed on the better second-degree polynomial fitting algorithm.Compared with 15.39%before calibration,it was reduced to 2.27%after calibration,it was verified that the calibration method can greatly improve the linearity of current wavelength tuning of DFB semiconductor lasers.

关 键 词：DFB半导体激光器 调谐技术 多项式拟合算法 线性度分析 预校准 

分 类 号：TN21[电子电信—物理电子学] TN29