VAD法制备大尺寸芯棒的研究

Research on VAD method of fabricating large size core rod

为了提高芯棒尺寸并同时保持理想的沉积效率和合格的光学参数,采用气相轴向沉积法对影响芯棒尺寸的主要因素进行研究,优化沉积喷灯数量、包灯SiCl4流量和soot体提升速率。实验结果表明:三喷灯沉积工艺中,增加第一、第二包灯SiCl4原料流量至4.0 slm、5.0 slm且降低提升速率至85 mm/h时,沉积速率显著提高至15.8 g/min,soot体密度增大至0.319 g/cm^3,芯棒尺寸增大至99.1 mm,同时兼顾沉积效率至52.2%,并保持良好的G.652D单模光纤折射率剖面。

In order to increase core rod size and maintain the ideal deposition efficiency and qualified optical parameters,this paper studies the main factors affecting the core rod size by vapor phase axial deposition method.The number of deposition blowtorch,the flow rate of SiCl4 and the lifting rate of soot body are optimized.In the deposition process of three blowtorches,when the flow rate of SiCl4 in the first and second clad blowtorch is increased to 4.0 slm and 5.0 slm,and the lifting rate is reduced to 85 mm/h,the experimental results show that the deposition rate increases to 15.8 g/min,the bulk density of soot body increases to 0.319 g/cm^3,the core rod size increases to 99.1 mm,and the deposition efficiency reaches 52.2%,and the refractive index profile of G.652D single-mode fiber is maintained.