摘要
用理论分析证明了宽频带熔锥型单模光纤耦合器的原始模型，简化成有效平行波导的近似模型，必须作弱导近似和弱耦合近似。文中根据自制熔锥耦合器的实验，以及对其参数和截面尺寸测量及计算，表明具有哑铃形腰部横截面结构的宽频带熔锥型耦合器的组合波导满足弱导近似和弱耦近似条件。用有效平行波导的近似模型，计算耦合器转换功率随波长变化曲线，不仅宽频带特性的理论曲线与实验符合得较好，而且耦合器的耦合特性对两光纤芯径比及熔锥长度变化十分灵敏，这也与实验相符．
We Proved theoretica11y that the week guiding and weak coupling approximatlon must be untilized when our approximate paraIlel waveguide modeltakes the place of the original model of the fused tapered wide band coupler.According to the experiment on the weakly fused tapered coupler developed by us,we obtained that the fused tapered wide band coupler with a shape of dumb一bellsatisfied the weak guiding and weak coupling conditions.Furthermore,accordingto the curve of the translation power versus the wavelenth,we obtained that notonly the theoretical curve reflecting the wide band characteristic matched wellwith the experiment curve,but the coupling characteristic was very sensitive tothe ratio of two fiber coresand fused length,a fact identical with the practicai resuIt
出处
《应用科学学报》
CAS
CSCD
1995年第1期14-20,共7页
Journal of Applied Sciences
关键词
熔锥型
光纤耦合器
弱导
弱耦
simple model,fused tapered fiber coupler,weak guiding weak.coupling.
