基于可调有源双耦合器环级联复合腔滤波器的2 μ ｍ波段单纵模光纤激光器

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关键词：有源复合腔滤波器；铥钬共掺光纤；单纵模；光纤激光器 中图分类号：TN242 文献标识码：A DOI：10.37188/CJL.20240287 CSTR：32170.14.CJL.20240287

2- μ m -bandSingle-longitudinal-modeFiberLaserEnabledbyA Tunable Active Dual-coupler Ring Based Compound-cavityFilter

GUO Wenya’， SUN Weiwei'，WU Shengbao"，FENG Ting ， YAN Fengping4

1.Photonicsfomtionoaionenterollgeofsicsece&eclogyHebeiUnsityoding； 2.SchoolofControl Engineering，Northeastern Universityat Qinhuangdao，Qinhuangdao O66oo4，China;

3.HebeiKeyLaboratoryofMicro-NanoPrecisionOpticalSensingandMeasurementTechnology，QinhuangdaoO66o4，China; 4.SchoolofElectronicandInformationEngineering，BeijingJiaotong University，Beijing1Ooo44，China） *Corresponding Authors，E-mail：swu@hbu.edu.cn; fengting@neuq.edu.cn; fpyan@bjtu.edu.cn

Abstract：A2- μ m -band single-longitudinal-mode（SLM）thulium-holmium co-doped fiberlaser enabledby a tunable active dual-coupler ring based compound-cavity（ADCR-CC） filter is proposed and demonstrated.The ADCRCCfilterwithadjustablefilteringbandwidth（full-widthathalf-maximum，FWHM）and transmitanceiscombined witha fiber Bragg grating（FBG）to realize SLM laseroutput.Whenthe pump powers of the main cavity and the compound-cavity are1.8Wand1.1W，respectively，the wavelength of the measured laseroutputis 2O48.510 nm，the optical signal-to-noiseratio is as highas83.O8dB，and themaximal spectral center wavelength andpeak spectral power fluctuations within90 min are O.O06 nmand0.19dB，respectively，with the laseroutput powerof 50.03 mW.By adjusting the equal strength cantilever beam to change the strainacting on the FBG，the SLM laser can achieve a wavelength-tunable output in the range of1.45 nm.

KeyWords：activecompound-cavityfilter；thuliumholmiumco-doped fiber；single-longitudinal-mode；fiberlaser

1引言

2 μm 波段单纵模（Single-longitudinal-mode，SLM）光纤激光器具有高光束质量、长相干长度和高频率分辨率等特性，特别适用于自由空间光通信、高分辨光谱学、激光雷达以及高精度光纤传感[-5]。（剩余14397字）