全光纤收发同置激光雷达放大自发辐射噪声标定方法  

Calibration Method on Amplified Spontaneous Emission Noise for All-Fiber Coaxial Lidar

作　　者：强蔚 王冲[1] 薛向辉[1,2] Qiang Wei;Wang Chong;Xue Xianghui(School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,Anhui,China;Hefei National Laboratory,Hefei 230088,Anhui,China)

机构地区：[1]中国科学技术大学地球和空间科学学院,安徽合肥230026 [2]合肥国家实验室,安徽合肥230088

出　　处：《光学学报》2024年第18期184-190,共7页Acta Optica Sinica

基　　金：安徽省自然科学基金青年基金(2208085QD118);国家自然科学基金(42125402,42188101,42304165)。

摘　　要：为了提高全光纤收发同置激光雷达系统性能,并考虑望远镜镜面反射率和激光器出射光功率变化的影响,提出一种标定放大自发辐射(ASE)噪声的方法,通过收发分置激光雷达系统与收发同置系统接收的后向散射信号的比对,给出ASE噪声的距离变化函数,并利用该函数对收发同置系统的ASE噪声进行处理,有效地抑制了ASE噪声的影响。利用所搭建的实验系统验证了所提方法的合理性,并利用反演得到的大气消光系数对结果进行了验证,实验结果表明,所提方法可以有效地提高收发同置系统的探测性能。Objective Atmospheric environmental problems such as air pollution and greenhouse gas emissions not only impact climate change but also seriously threaten human life.Both greenhouse gas emissions reduction and air pollution control are related to changes in atmospheric compositions.In the context of“double carbon”,China aims to increase its national contribution,striving to peak carbon dioxide emissions by 2030 and achieve carbon neutrality by 2060.The basis for all policies formulated on atmospheric environmental improvement relies on accurate data of air pollution and greenhouse gas emissions.For this reason,the solution to atmospheric environmental problems depends on accurate monitoring technologies and forecasting methods of atmospheric parameters.Lidar has obvious advantages in atmospheric parameters monitoring because of its high spatial and temporal resolution,high sensitivity,real-time operation,non-contact,etc.To achieve compactness and lightweight design suitable for various load platforms,the all-fiber coaxial lidar is an attractive option.In recent years,all-fiber lidar has been widely applied in atmospheric parameters measurement due to its flexible transformation of light beams,less susceptibility to temperature,pollution,and other environmental factors,and ability to achieve higher precision measurement.Compared with the biaxial system,the all-fiber coaxial system has significant advantages,such as low cost,simple,compact and stable structure,and small blind zone.Meanwhile,the amplified spontaneous emission(ASE)noise from the fiber amplifier is inevitable for a coaxial lidar system and degrades the performance of the lidar system.The ASE backscattering from specular reflection results in a decreased signal-to-noise ratio,shortened effective measurement distance,and even misidentification.The ASE noise of the amplifier could be regarded as a fingerprint function.To improve the performance of the all-fiber coaxial lidar,a method for calibrating ASE noise is proposed and changes in mirror reflect

关 键 词：大气光学 标定方法 ASE 全光纤激光雷达 

分 类 号：P412[天文地球—大气科学及气象学]