调制光栅Y分支激光器波长准连续调谐方法  

Quasi-continuous Wavelength Tuning Method of Modulated Grating Y-branch Laser

作　　者：任帅 庄炜[1,2] 董明利[1,2] 王永千 闫光[1,2] 吴越 REN Shuai;ZHUANG Wei;DONG Mingli;WANG Yongqian;YAN Guang;WU Yue(Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument,Beijing Information Science&Technology University,Beijing 100192,China;Beijing Laboratory of Optical Fiber Sensing and System,Beijing Information Science&Technology University,Beijing 100016,China)

机构地区：[1]北京信息科技大学光电测试技术及仪器教育部重点实验室,北京100192 [2]北京信息科技大学光纤传感与系统北京实验室,北京100016

出　　处：《光子学报》2022年第6期315-323,共9页Acta Photonica Sinica

基　　金：国家自然科学基金(No.5167052542,61801030);北京市自然科学基金(No.4212048,4202027)。

摘　　要：针对调制光栅Y分支(Modulated Grating Y-branch,MG-Y)激光器难以实现特定波长稳定准连续调谐问题,提出一种基于K近邻模型的MG-Y激光器波长查找表构建方法。该方法基于K近邻模型,快速分类得到左、右光栅准连续调谐区域,依据MG-Y激光器相位调谐特性,采用牛顿非均匀插值方法实现了MG-Y激光器波长精细调谐。实验结果表明,按照该表控制激光器的输出光波长准确度为2 pm,稳定性为0.7 pm,F-P标准具解调波长稳定性为1.73 pm,FBG解调波长稳定性为1.75 pm,FBG解调波长相关系数R大于0.9525。该方法可控制MG-Y激光器实现稳定的波长准连续调谐,满足光纤传感解调应用需求。Tunable laser has been widely introduced in the field of optical fiber sensing as core component for spectrum analysis,wavelength division multiplexing and grating demodulation in recent years.There is a new type called Modulated Grating Y-branch(MG-Y)laser,and the characteristics of small size,wide tunable range and fast wavelength switching made it extremely popular in the field of optical fiber sensor demodulation.The primary key technology for MG-Y laser that needs to be solved in the application of fiber sensing is to control multiple input currents at the same time and build a stable,accurate and continuous wavelength Look Up Table(LUT).However,the wavelength tuning characteristics of MG-Y lasers are complex,the traditional methods are inefficient,the tuning wavelength can not meet the resolution requirements,and it is difficult to ensure the accuracy and stability of the output wavelength,which in turn affects the demodulation fiber sensing accuracy.Therefore,it is particularly necessary to find a new method for quasi-continuously tuned LUT construction.Aiming at the problem that it is difficult to achieve a stable quasi-continuous tuning of a specific wavelength for modulated grating Y-branch lasers,we proposed a method of constructing a wavelength look up table for MG-Y lasers.The method based on the KNN model,which is a simple classification algorithm.It can convert multi-class problems into multiple two-class problems for discussion,and calculate the accuracy rate,recall rate,and F1-score.The construction process of LUT is mainly divided into 4 parts:obtain the initial scan data,identify the I_(LR) and I_(RR) quasi-continuous tuning range,identify the linear tuning range of each segment of I_(PH),interpolation retrieval of target wavelength in a single path,generate LUT of MG-Y laser.This method has achieved rapid classification of the wavelength quasi-continuous tuning region.It used toolkit of sklearn machine learning.Its input is the wavelength parameter-control of L_(1),output wavelength,which are

关 键 词：MG-Y激光器 波长控制 K近邻 查找表 连续调谐 

分 类 号：TN248.4[电子电信—物理电子学]