基于非对称圆弧Y分叉单元的多模光功率分配器结构设计  

Design of Multimode Optical Power Splitter Based on Asymmetric Arc-Shaped Y Branch Unit

作　　者：李书[1] 林巧[1] 吴兴坤[1] 

机构地区：[1]浙江大学现代光学仪器国家重点实验室光及电磁波研究中心,浙江杭州310027

出　　处：《光学学报》2011年第3期254-258,共5页Acta Optica Sinica

摘　　要：采用光束传播法(BPM)获取一种全新的基于非对称Y分光单元的多模光功率分配器设计。针对光能量在多模传输波导中分布不均的特点,引入了基于圆弧结构的非对称结构,从而实现了对波导中能量的平均分配。通过对各设计参数与输出功率的关联分析,导出了一系列同多模功率分配器结构相关的公式。以此为基础确定了分别对应于62.5μm,120μm波导宽度的1×4,1×8多模光功率分配器的结构及具体参数。其器件长度分别为7.6 mm,21.7 mm。理论计算表明此两种器件在1.31μm窗口具有极为均匀的分光性,对应的插入损耗为6.05 dB及9.06 dB,器件的偏振相关损耗大约在0.2 dB。Efforts are made to obtain a novel multimode optical power splitter based on asymmetric Y splitter by means of beam propagation method（BPM）.As lack of uniformity for multimode light power in waveguides,a special asymmetric Y branch on curves is brought into the structure to reach an evenly divided power output.Relation between splitter parameters and the output power has been analyzed.A series of equations for the splitter structure design are obtained.Both 1×4 and 1×8 power splitter designs with a 62.5 μm and 120 μm waveguide width respectively are provided with an overall length of 7.6 mm and 21.7 mm,respectively.The calculation results show that these splitters exhibit an excellent splitting uniformity in 1.31 μm window.The calculated insertion loss for the two designs are 6.05 dB and 9.06 dB with the polarization-dependent loss to be 0.2 dB.

关 键 词：光学设计 光功率分配器 集成光器件 组件 

分 类 号：TN256[电子电信—物理电子学]