摘要
分束器是光纤通信系统中光无源网络和光子集成回路的重要器件。1×2 MMI(multimode interferences)电光有机聚合物分束器是利用自成像效应设计的。分析了1×2 MMI的工作原理。利用有效折射率方法(effective index method,EIM)计算出1×2 MMI三维多模脊形波导的有效折射率分布。利用自成像效应的成像规律计算出成像位置并用导模传输分析法(guided-mode propagation analysis,MPA)对输出波导的光强进行模拟。分析表明:在波长为1.55μm的情况下,1×2 MMI的输出波导的光强在未加电极时可以实现预定分束比输出;加上电极之后,由于电光效应可调控有机聚合物波导折射率的改变,利用有限差分光束传播法模拟输出波导的分束比可在7.6 dB范围内可调。
Optical power splitters are essential devices for optical fiber communication system in passive optical networks（PONs） and photonic integrated circuits（PICs）.As one of the optical splitters,1×2 electro-optical multimode interference（EO-MMI） power splitter fabricated by electro-optic organic polymer was analyzed by the self-imaging effect.The operation principle of the 1×2 EO-MMI power splitter was discussed.Firstly,the effective index of the three dimensional（3-D） ridge waveguide was computed by the effective index method（EIM）.Then the positions of the two images were calculated respectively by using the formulas of the self-image effect.The power-splitting ratio in the output waveguides was simulated by the guided mode propagation analysis（MPA）.Research results show that,for the 1×2 EO-MMI power splitter operating at 1.55 microns,the special power-splitter ratio can be obtained if there are no electrodes on the ridge waveguide.Furthermore,when the electrodes are put on the top of the waveguide,the power splitting ratio is realized for a tunable scope of 7.8 dB,for the electro-optical effect to change the refractive index.
出处
《应用光学》
CAS
CSCD
北大核心
2011年第1期124-127,共4页
Journal of Applied Optics
基金
国家863计划(2007AA01Z269)
总装"十一.五"(2009AA03Z413)
关键词
电光有机聚合物
分束器
有效折射率法
导模传输分析法
分束比
electro-optic organic polymer
power splitter
effective index method
guided mode propagation analysis
power splitting ratio
