臺灣博碩士論文加值系統

在全波向量分析的基礎上, 我們利用表面積分方程式法對融燒式光纖耦合
器的耦合特性做研究. 為了建立對融燒式光纖耦合器的三維電磁模型, 我
們利用階梯狀函數將耦合器的延展結構分割成許多小切面來做近似, 再利
用表面積分方程式法來得到每個切面上的傳播特性. 而對於耦合器的延展
結構不連續面上, 藉由模態匹配方法可以計算模態之間可能轉換的效應.
我們使用此三維模型對不同結構參數的融燒式光纖耦合器, 特別是以兩根
不同光纖構成的非對稱型耦合器, 做理論研究.

Based on a full-wave vectorial formulation, the surface
integral equation method (SIEM) has been employed to investigate
the coupling characteristics of fused fiber-optic couplers. To
establish a three-dimensional (3-D) electromagnetic model for
the fused coupler, the step-like approximation is used to
approximate the tapered structure of the coupler into many small
segments. The SIEM is employed to solve the propagation
characteristics for each segment, and the mode-matching method
is used to takeinto account the possible mode conversion at each
discontinuity along the tapered coupler. Using this 3-D model,
we theoretically study fused fiber-optic couplers with different
structure parameters, in particular, the asymmetrical couplers
composed of two dissmilar fibers.