利用全光纤Mach-Zehnder干涉仪对二极管激光器瞬态特性进行表征

可调谐二极管激光器在电流调谐过程中的瞬态特性,包括瞬态输出波长和线宽等光学参数,在TDLAS系统中是一个重要的参数需要进行实时准确的测定。而常规的测量方法无法同时满足高精度与高速度的要求,因此,对短光纤延迟差拍法测量TDL的动态特性进行了理论分析和实验研究,搭建测试系统,确定了光纤延迟线长度与调谐率对差拍信号纯度的影响...

Measurement of the Transient Tuning Characteristicsof Tunable Diode Laser Based on All-Fiber Mach-Zehnder Interferometer

The tuning characteristics of tunable diode laser include parameters such as transient output wavelength and line width.The parameters are very important and should be measured with real-time accuracy in TDLAS.But regular measurement cannot measure its quality of accuracy and high speed.This paper studies theoretically and experimentally of TDL dynamic characteristics of the short fibers delay beat,With the establishment of a testing system,it discovers the influence of time delay line length and tuning rate to beat signal purity,it also makes real-time measurement for the dynamic tuning characteristics of DFB TDL,thus getting the laser transient output wavelength and line width of different currents by the result of beat signal in a current tuning cycle,namely,current transient tuning characteristics.The result difference is within 0.003nm compared with the static characteristic from spectrometer measuring.Fiber Delay Self-heterodyne can quickly,accurately and real-timely monitor TDL transient characteristics.The measuring precision is increased when it is applied to TDLAS system,realizing TDL real-time monitoring and optimization according to monitoring transient characteristics.