摘要
针对高精度相干激光探测需求,提出了一种基于环形腔结构的双波长单频输出掺饵光纤激光器。该激光器使用未泵浦的掺饵光纤作为可饱和吸收体,结合标准具结构的光纤法布里-珀罗滤波器和光纤布拉格光栅,实现1570 nm和1548 nm附近的双波长单频激光输出,其中心波长分别为1569.97 nm和1548.06 nm,光信噪比分别达到58 dB和55 dB。通过在100 min内对输出激光光谱和功率的连续数据采集,得到输出功率波动分别为0.01 dB和0.02 dB,且光谱仪上始终未见输出激光光谱中心波长变化,表明输出激光具有良好的工作稳定性。采用延时非零自外差法测量了输出激光的线宽,测得1570 nm处激光线宽约为230.2 Hz,1548 nm处线宽约为223.6 Hz。
This paper studies a dual-wavelength single-frequency Er-doped fiber laser based on ring cavity,the output wavelengths are 1570 nm and 1548 nm.The laser combines Fabry-Perot(FP)filter and Fiber Bragg Grating(FBG)to achieve wavelength selection and preliminary stabilization.And two unpumped Er-doped fibers act as saturable absorbers to realize linewidth narrowing effect.The Laser Diode(LD)used has a maximum drive current of 700 mA,which corresponds to a maximum pumping power of 450 mW and 500 mW.When the pump power of LD1 is up to 58 mW and the diver current of LD2 is up to 138 mW,the fiber laser gets dual-wavelength output.The output power of the 1570 nm and 1548 nm laser generated at this time are 4.2 mW and 10.1 mW respectively.Then the pump power of LD1 and LD2 are adjusted to 104 mW and 83 mW respectively,and the output laser characteristics were studied under this condition.The output power in 1570 nm is 10.3 mW,and the Optical Signal to Noise Ratio(OSNR)is 58 dB.The output power in 1548 nm is 4.7 mW,and the OSNR is 55 dB.It shows that the output laser has a relatively high-quality factor and high slope efficiency.Then the stability of the output laser is studied.In order to measure the stability of the output laser of the dual-wavelength single-frequency laser,data collection is started half an hour after the laser is turned on in the experiment.Every 10 min,the spectrum is collected and the output power is recorded.The power fluctuations of the laser output in 1570 nm and 1548 nm are 0.01 dBm and 0.02 dBm,respectively,and the wavelength drifts of the output laser are both less than 0.01 nm.The result shows that the fiber laser can avoid the mutual interference between the two wavelengths.The output laser has good power stability and wavelength stability.The laser linewidth is the parameter of most concern for a single-frequency fiber laser.In this experiment,the linewidths of the output laser are measured by the delay non-zero self-heterodyne method based on the Mach-Zehnder interferometer and fitted with
作者
张华得
高曦伦
沈永行
ZHANG Huade;GAO Xilun;SHEN Yonghang(College of Optical Science and Engineering,Zhejiang University,Hangzhou 310027,China;State Key Laboratory of Modern Optical Instrumentation,Hangzhou 310027,China)
出处
《光子学报》
EI
CAS
CSCD
北大核心
2023年第2期53-60,共8页
Acta Photonica Sinica
基金
国家自然科学基金(No.62075190)。