熔锥型光纤耦合器的制备与测试  

Fabrication and Testing of Fusion-Tapered Fiber Optic Coupler

作　　者：侯玲珑[1] 段吉安[1] 易子馗[1] 

机构地区：[1]中南大学机电工程学院,长沙410083

出　　处：《光纤与电缆及其应用技术》2005年第5期28-30,40,共4页Optical Fiber & Electric Cable and Their Applications

基　　金：国家自然科学基金资助项目(50235040);教育部新世纪优秀人才支持计划(040753)

摘　　要：论述了熔锥型光纤耦合器的功率耦合理论,利用熔融拉锥法制得了3 dB单模光纤耦合器。利用可调谐光源和光谱分析仪组成的光学测试系统,测试了熔锥型光纤耦合器的附加损耗、方向性与均匀性等光学性能。实验表明,该方法具有制作简单、较低的附加损耗和良好的方向性等优点。利用扫描电子显微镜观察了光纤耦合器的表面,发现在光纤耦合器的锥区存在微裂纹,并且拉伸速度越快,微裂纹越明显;在光纤耦合器的耦合区,光纤表面存在微小晶粒,且拉伸速度越慢,晶粒越粗大。The coupling theory of fusion-tapered fiber optic coupler is described. The 3 dB coupler is fabricated with the method of fused biconical taper. The optical characteristics of the coupler, such as excess loss, directivity and uniformity, are tested with the optical testing system built with tunable laser and optical spectrum analyzer. The experiment indicates that the method of fused biconical taper has the advantages of simple process, low excess loss, and good directivity, etc.. The structural shape of the coupler is observed with scanning electron microscope （SEM）. It is found that microcracks exist in the taper region. And with the increasing of drawing speed, the microcracks get more obvious. In the coupling region, tiny crystalline grains are found, and the lower the drawing speed, the bigger the crystalline grains are.

关 键 词：光纤耦合器 耦合模理论 熔融拉锥法 微裂纹 析晶 

分 类 号：TN256[电子电信—物理电子学]