熔锥型光纤耦合器的工艺与显微形貌研究

以六轴光纤耦合机为实验平台,研究了熔融拉锥光纤耦合器的工艺、性能、显微形貌三者之间的相关规律.利用热电偶和电位差计测得了熔融拉锥时火焰的温度场分布,利用扫描电子显微镜观察了光纤耦合器的显微形貌.经大量观测实验研究发现:在光纤耦合器的锥形区域,存在皲裂,并且拉伸速度越快,皲裂越明显;在光纤耦合器的耦合区域,光纤表面存在微小晶粒,而内部没有发现微晶,即光纤耦合器玻璃表面发生了析晶现象,且拉伸速度越慢,晶粒越大.

Technology and Micromorphology of Fused Taper Fiber Coupler

Using the six-axes opt ic fiber coupler machine as experiment platform,the rule between the three of tech nology,performance and microstructure of optical fiber coupler is investigated.B y using thermocouple and potentiometer,the flame temperature in fused biconical taper (FBT) region is measured.The structural shape of the optical fiber coupler is observed by using scanning electron microscope (SEM).Through a large amount of experiments,it is found that there exist the exist the cracks in the taper re gion.And the faster to draw is the more obvious to cracks will be.In the couplin g region,there are little crystallines on the surface of the coupler,and there i sn't little grain inside,namely the coupler surface happened to the crystallizin g phenomenon in coupling region.And the lower to draw is,the bigger the crystall ine grain will be.The production of the cracks may be caused by the heat stress.