摘要
对内径为41~43μm,外径约为188μm、251μm和270μm的锗芯光纤进行激光退火实验,研究CO_(2)激光沿光纤轴向扫描速度对锗芯拉曼峰频率和光传输损耗特性的影响。研究发现,激光扫描速度是决定退火后光纤特性的重要参数。对不同外径的光纤,达到最优退火效果的激光扫描速度不同,188μm、251μm和270μm外径的锗芯光纤分别为10 mm·s^(-1)、14 mm·s^(-1)和16 mm·s^(-1),光传输损耗分别为3.435 dB·cm^(-1)、2.147 dB·cm^(-1)和3.578 dB·cm^(-1)。使用COMSOL软件对退火过程中纤芯表面固定点的温度变化进行了模拟仿真研究,仿真结果显示激光退火过程中温度呈脉冲形变化。相同外径条件下,激光扫描速度提高,温度脉冲的峰值升高、谷值降低、单脉冲持续时间缩短;相同扫描速度条件下,光纤外径减小,温度脉冲峰值提高,谷值降低。
As the germanium(Ge)core is mostly in an amorphous or polycrystalline state after fabrication,laser annealing is an effective way to improve the properties of semiconductor core fiber.During the laser annealing process,the axial scanning velocity of the laser along the fiber is an important parameter that affects the properties of the annealed fiber.Therefore,it is of great significance to investigate the modification mechanism of laser annealing on the Ge core to improve the properties of annealed fibers.In this study,three sets of Ge core fibers with different outer diameters(OD)and the same inner diameter(ID)were annealed by CO_(2) laser at different scanning velocities.The laser annealing experiments were carried out on Ge core optical fibers with an ID of 41~43μm and the ODs of 188μm,251μm,and 270μm,respectively.The Ge core fibers were annealed by the SK-3D30 CO_(2) laser.The laser spot is 1 mm in diameter,the output power is 0~30 W,and the laser wavelength is 10.6μm.The scanning region along the fiber axis is 1 mm×50 mm,which can completely cover the Ge core fiber,and the laser scanning in this region was reciprocated along the fiber axis during the annealing time.After laser annealing,samples were analyzed by using the spectrometer.Raman experiments were carried out on the cross-section of the Ge core fiber to collect the Raman peak frequency information.The obtained data was processed into mapping by MATLAB software.The optical transmission loss of Ge core fiber was measured by the cutback method.The system consists of a laser,photodetector,and optical power meter.The samples were cut off at 5 mm each time and measured 3 times per fiber.All measurements were made at room temperature.Three sets of experiments were carried out,the laser frequency is 50 kHz,the laser power is 20%(6 W),and the laser scanning time is 20 s.1)The Ge core fiber with an OD of about 188μm was annealed by laser,and the scanning velocities were set at 8 mm·s^(-1),10 mm·s^(-1),12 mm·s^(-1),and 14 mm·s^(-1).The Raman frequen
作者
杜亦凡
赵子文
钟双栖
马泽成
王少业
DU Yifan;ZHAO Ziwen;ZHONG Shuangqi;MA Zecheng;WANG Shaoye(School of Communication&Information Engineering,Shanghai University,Shanghai 200444,China;Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Shanghai University,Shanghai 200444,China;Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication,Shanghai University,Shanghai 200444,China)
出处
《光子学报》
EI
CAS
CSCD
北大核心
2024年第4期84-94,共11页
Acta Photonica Sinica
基金
国家自然科学基金(No.61975114)。
