高稳定性光纤激光器恒流驱动系统设计与实现  

Design and implementation of a constant current driving circuit for high stability fiber optic device

作　　者：王拓 唐德东 王凯 张淑敏 李欣宇 孟坤 Wang Tuo;Tang Dedong;Wang Kai;Zhang Shumin;Li Xinyu;Meng Kun(College of Electrical Engineering,Chongqing Science and Technology University,Chongqing 401331,China;PetroChina Southwest Oil&Gas Field Sichuan Northwest Gas Mine Sichuan,Mianyang 621700,China;Qingdao Quenda Terahertz Technology Co.,Ltd.,Qingdao 266100,China)

机构地区：[1]重庆科技大学电气工程学院,重庆401331 [2]中国石油西南油气田川西北气矿,四川绵阳621700 [3]青岛青源峰达太赫兹科技有限公司,山东青岛266100

出　　处：《电子技术应用》2025年第4期49-53,共5页Application of Electronic Technique

基　　金：重庆市技术创新与应用发展专项(cstc2019jscx-msxmx0054)。

摘　　要：光纤激光器波长和输出功率的稳定性易受泵浦源驱动电流波动的影响,为应对该问题,设计了一款高精度、高稳定性恒流驱动系统。恒流源部分采用闭环负反馈原理,通过金属氧化物半导体场效应晶体管(MOSFET)来控制恒流输出,实现了对半导体激光器(LD)驱动电流的精准控制;限流保护电路利用二极管的限幅作用使LD免受过电流冲击的影响,电流缓慢启动采用软件控制的方法确保LD免受浪涌电流损害;光功率探测电路采用ADA4530芯片,确保在极低光照水平下也可精准探测到功率输出。实验结果表明,该电路可实现驱动电流在0~1.2 A连续可调,电流短期(120 min)和长期(24 h)稳定性分别为±0.001 mA和±0.002 mA;激光器中心波长波动不超过±0.03 nm,输出功率的稳定度不超过0.084 3%,精度小于±0.15 mW。The stability of the wavelength and output power of the fiber laser is susceptible to fluctuations in the pump drive current,and a high-precision,high-stability constant-current drive system has been designed to cope with this problem.The constant current source part adopts the closed-loop negative feedback principle to control the consistent current output through the Metal-Oxide-Semiconductor Field-Effect Transistor(MOSFET),realizing the precise control of the semiconductor laser(LD)drive current.The current-limiting protection circuit protects the LD from overcurrent shocks by utilizing the diode's limiting effect,and the current slow start uses a software-controlled method to protect LD from inrush current damage.The ADA4530 chip is used in the optical power detection circuit to ensure accurate detection of power output even at deficient light levels.The experimental results show that the circuit can achieve continuous adjustment of the drive current from 0 A to 1.2 A,with short-term(120 min)and long-term(24 h)current stability of 0.001 mA and 0.002 mA,respectively.The wavelength fluctuation of the laser center does not exceed 0.03 nm,and the stability of the output power does not exceed 0.0843%,with an accuracy of less than±0.15 mW.

关 键 词：光纤激光器 恒流驱动 稳定性 泵浦源 

分 类 号：TN248[电子电信—物理电子学]