宽频带熔锥型耦合器的变化分析

Variational analysis of wavelength-flattened fused tapered couplers

利用变分法对腐蚀熔锥型非对称单模光纤耦合器的耦合特性进行了分析.文中根据耦合器的光纤参数及截面尺寸,用有效平行波导模型,对自制的弱融型熔锥耦合器的转换功率随波长变化曲线进行了计算.结果表明,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二光纤的芯径比及熔锥长度的变化十分灵敏,这也与实验相符.

This paper describes the variation of coupled power with wavelength in the etched fused asymmetric single-mode couplers by using variational technique. According to the fibler parametera and sectional dimensions we analyzed the wavelength response of our lightly fused coupler using effective parallel waveguides. The theoretical curve of the wavelength-flattened coupler is in good agreement with the experimental results. The analysis indicates that the wavelength response of the coupler is sensitive to the diameter ratio of two fibres and the coupling length. This also agrees with the exper iment.