基于多通道FP-FBG的波长可切换单纵模掺铥光纤激光器  

Wavelength-Switchable Single-Longitudinal-Mode Thulium-Doped Fibre Laser with Multi-Channel FP-FBG

作　　者：王伟利 延凤平[1] 张鲁娜 Wang Weili;Yan Fengping;Zhang Luna(Key Laboratory of All Optical Netiwork and Adloanced Telecommunication Net work of Ministry of Edueatiow,Institute of Lightwave Technology,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学光波技术研究所全光网络与现代通信网教育部重点实验室,北京100044

出　　处：《中国激光》2021年第21期1-11,共11页Chinese Journal of Lasers

基　　金：国家自然科学基金(61827818,61620106014,61775128)。

摘　　要：对2μm波段的法布里-珀罗光纤光栅进行了仿真分析和实验制作;设计并搭建了一种基于多通道法布里-珀罗光纤光栅滤波器的三波长间可切换的单纵模复合腔掺铥光纤激光器。激光谐振腔内使用由两个光耦合器组成的8字环无源子腔来扩大纵模间隔;使用自制法布里-珀罗光纤光栅滤波器进行波长选择,并利用偏振控制器调节腔内损耗以抑制光纤激光的强模式竞争;通过应力调节架调节均匀光纤光栅,实现了三个波长间切换的单纵模激光运转。实验结果表明:在室温时,该掺铥光纤激光器可获得输出波长分别为1941.48 nm、1941.57 nm和1941.65 nm,对应光信噪比分别为61 dB、61 dB和60 dB的稳定的可切换单纵模激光输出。分别对三个波长的激光进行连续50 min的稳定性测量,得到激光输出功率的波动分别小于0.39 dB、0.61 dB和0.55 dB,波长波动小于光谱仪的最小分辨率0.05 nm,说明该激光器具有良好的稳定性。Objective The fibre laser working in the eye-safe 2.0-μm band is an important pump source for producing the~3--5μm mid-infrared laser,and the single-longitudinal-mode fibre laser has the characteristics of large gain,good coherence,and stable spectrum.This laser can be applied to laser optical radio,coherent optical communication,optical fibre sensing,optical fibre remote sensing,and other fields having large light source requirements.The wavelength-switchable fibre laser has a flexible output laser wavelength,which has great application value in the wavelength division multiplexing and multi-parameter sensing systems.The single-longitudinal-mode thulium-doped fibre laser operating in the 2.0-μm band has a wide range of applications,and it is necessary to further study and optimize its performance.Single-longitudinal-mode fibre lasers have excellent and better power stability than the traditional semiconductor lasers,and their modulation amplitude does not change with the modulation frequency.However,there are very few reports on the 2.0-μm-band spatial optical network.The 2.0-μm-band wavelength division multiplexing system requires the single-longitudinal-mode and multi-wavelength thulium-doped fibre laser.In our study,we reported a three-wavelength-switchable single-longitudinal-mode thulium-doped fibre laser based on a Fabry-Perot fibre Bragg grating filter.Under the normal room temperature condition,this laser can obtain the singlelongitudinal-mode,high stability,ultra-high optical signal-to-noise ratio,and high power output.Therefore,this study has an important application value in space optical communications.Methods The experimental structure of the proposed laser is shown in Fig.6.A 793-nm laser diode was used as the pump source,pumping a 2-m thulium-doped fibre.The circulator ensured the one-way operation of the optical path in the cavity;a three-channel narrow-band Fabry-Perot fibre Bragg grating filter and a fibre Bragg grating were fabricated using the phase-mask method.The fibre Bragg grating wa

关 键 词：激光光学 掺铥光纤激光器 单纵模 复合腔 光纤光栅 法布里-珀罗光纤光栅滤波器 

分 类 号：TN248.1[电子电信—物理电子学]