基于铌酸锂薄膜的可重构三波导耦合偏振分束器(特邀)  

Reconfigurable Polarization Beam Splitter on a Lithium-Niobate-on-Insulator Platform Using a Triple-Waveguide Coupler(Invited)

作　　者：倪屹[1] 夏骏 费耶灯 Ni Yi;Xia Jun;Fei Yedeng(School of Internet of Things Engineering,Jiangnan University,Wuxi 214122,Jiangsu,China)

机构地区：[1]江南大学物联网工程学院,江苏无锡214122

出　　处：《激光与光电子学进展》2024年第11期158-163,共6页Laser & Optoelectronics Progress

基　　金：江苏省研究生实践创新计划(SJCX23_1223)。

摘　　要：针对智能光互连系统对动态可重构性的需求日趋增加,提出了一种基于铌酸锂薄膜(LNOI)的可重构三波导耦合结构偏振分束器(PBS)。通过改变光学相变材料(PCM)涂层的相态,可以控制横磁(TM)模式的输出端口从而实现可重构功能。利用三维时域有限差分法(3D-FDTD)对器件进行参数优化和性能分析。结果表明,当PCM为非晶态时,器件可以很好地分离TM和横电(TE)模式,在1530~1580 nm波长范围内TM模式偏振消光比大于20 dB并且TE模式具有极低的插入损耗(约0.03 dB)。当PCM处于晶态时,器件具有可重构功能,TM模式和TE模式沿着输入波导传输,同时器件长度仅为35μm,满足片上铌酸锂集成需要。此外,还研究分析了器件的工艺容差,结果表明该设计具有一定的鲁棒性。Due to the increasing demand for dynamically reconfigurable properties in building intelligent optical interconnects,a reconfigurable polarization beam splitter(PBS)on a lithium-niobate-on-insulator(LNOI)platform using a triple-waveguide coupler was implemented.The output port of the transverse magnetic(TM)mode can be controlled by adjusting the phase state of the optical phase change material(PCM)to realize the reconfigurable function.A 3D finite difference time domain(3D-FDTD)method was also employed to investigate the performance and to optimize the structure of the PBS.The results show that the TM and transverse electric(TE)modes can be efficiently separated when PCM is in the amorphous state,where the extinction ratio exceeds 20 dB in the wavelength range of 1530‒1580 nm under the TM mode and an ultra-low insertion loss is incurred under the TE mode(approximately 0.03 dB).When the PCM switches into the crystalline state,the TM and TE modes transmit along the input waveguide,and the reconfigurable function is enabled,where the size is 35μm,which is compact for integration.Finally,the fabrication tolerance of the device is investigated,and the results indicate a certain degree of robustness.

关 键 词：集成光学 铌酸锂 偏振分束器 相变材料 

分 类 号：O436[机械工程—光学工程]