星形光波导耦合器的耦合特性分析  

Coupling Characteristics of Star Waveguide Coupler

作　　者：郭福源[1] 王明华[1] 

机构地区：[1]浙江大学信息与电子工程学系

出　　处：《光学学报》2006年第12期1797-1802,共6页Acta Optica Sinica

基　　金：国家自然科学基金重点项目(60436020);福建省自然科学基金(A0540001);福建省科学技术厅K类项目(K04022)资助课题

摘　　要：根据TE0模光波导的本征场分布、瑞利索末菲标量衍射积分公式和激励源与光波导耦合的匹配效率公式,给出光波导端面衍射和耦合的归一化发射系数和接收系数计算公式,推导出光波导端面非接触耦合的耦合效率计算公式。光波导模场分布采用高斯函数近似表达,给出简洁的计算光波导端面非接触耦合的耦合效率函数表达式。最后,基于星形光波导耦合器结构参量的特点,将累加运算采用积分运算近似表达,给出星形光波导耦合器接收光波导总的接收效率与耦合器基本参量的关系,阐明了星形光波导耦合器的耦合特性。As the eigen field distribution of the TE0 mode optical waveguide, Rayleigh-Sommerfeld diffraction integral formula and coupling efficiency formula between driving source and receiving optical waveguide are engaged, the expressions of the normalized emission and receiving coefficients of optical waveguide end faces are presented, the expression of coupling efficiency between two non-contact optical waveguides is derived. Then, as the expression of Gaussian approximation for the mode field distribution of optical waveguide is adopted, a compact expression of coupling efficiency between two non-contact optical waveguides is presented. Finally, as the characteristic of the structural parameters of star waveguide coupler is considered, the accumulative operation is replaced by integral operation approximately, the relationship between the total receiving efficiency of receiving waveguides of star waveguide coupler and the basic parameters of this coupler is derived, and the coupling characteristic of this coupler is explained.

关 键 词：导波光学 耦合特性 高斯近似 星形耦合器 衍射 耦合 

分 类 号：TN256[电子电信—物理电子学] O436.1[机械工程—光学工程]