基于斜入射MMI的偏振分束器的研究
首发时间:2020-02-07
摘要:硅基偏振分束器是硅基光子集成的关键器件之一。本文基于传统多模干涉耦合(MMI)理论,设计了一种新型的基于斜入射MMI的偏振分束器。仿真结果表明,通过采用与多模干涉区成一定角度的入射结构,当多模干涉区宽度为2.85μm时,本文提出的基于斜入射MMI的偏振分束器,比传统MMI偏振分束器的尺寸缩减了57%。除此之外,本文所提出的偏振分束器在偏振消光比>20dB时,对于TM模式有68nm(1522nm-1590nm)的工作带宽,对于TE模式有26nm(1534nm-1560nm)的工作带宽。其中,在1550nm处,TE模式消光比可达31.1dB;TM模式消光比可达29.3dB。
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Study of Polarization Beam splitter Based on Side-injection MMI
Abstract:Silicon-based polarization beam splitter is one of the key devices for silicon-based photon integration. Based on the traditional multimode interference coupling (MMI) theory, a new polarization beam splitter based on side-injection MMI is designed in this paper. The simulation results show that the polarization beam splitter based on side-injection MMI proposed in this paper is more efficient than the traditional MMI polarization beam splitter by adopting an incident structure at a certain angle to the multi-mode interference region. When the width of the multi-mode interference region is 2.85 μm Reduced size by 57%. In addition, the polarization beam splitter proposed in this paper has a working bandwidth of 68nm (1522nm-1590nm) for TM mode and a working bandwidth of 26nm (1534nm-1560nm) for TE mode when the polarization extinction ratio is> 20dB. Among them, at 1550nm, the TE mode extinction ratio is 31.1dB; the TM mode extinction ratio is 29.3dB.
Keywords: Polarization beam splitter multimode interference coupling side-injection size reduction
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