具有厚硅层的偏振分束-旋转-合波集成器件  

A Polarization Beam Splitting-rotation-multiplexing Integrated Device with Thick Silicon Core Layer

作　　者：宋泽琳 陈鹤鸣[1,2] SONG Ze-lin;CHEN He-ming(College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology),Nanjing 210023,China;Bell Honors School,Nanjing University of Posts and Telecommunications,Nanjing 210023,China)

机构地区：[1]南京邮电大学电子与光学工程学院、柔性电子(未来技术)学院,南京210023 [2]南京邮电大学贝尔英才学院,南京210023

出　　处：《光通信研究》2022年第6期50-57,共8页Study on Optical Communications

基　　金：国家自然科学基金资助项目(61571237);江苏省自然科学基金资助项目(BK20151509)。

摘　　要：为解决绝缘体上硅平台的偏振相关损耗和偏振相关损耗和偏振模色散问题,提高偏振分集系统的工作效率,文章提出了一种基于厚硅基波导非对称定向耦合器(ADC)和亚波长光栅(SWG)的偏振分束-旋转-合波集成器件,可以实现将任意输入光波转换为基本横电(TE)模式的光输出。该集成器件由偏振分束器、偏振旋转器和合波器3个部分构成。运用三维有限时域差分法(3D-FDTD)进行仿真分析,对结构参数进行了优化。仿真结果表明,该器件尺寸为4.5μm×56.0μm,在1.55μm的中心波长处,具有45 dB的高偏振消光比,插入损耗为0.53 dB,偏振消光比大于30 dB且插入损耗小于1 dB时,带宽为75 nm,覆盖了整个C波段。最后,分析了工艺误差对器件性能的影响。该集成器件结构紧凑,偏振消光比更高,可以满足现代光通信和光集成系统的需求。To solve the polarization-ralated losses and polarization mode dispersion problems of silicon on insulator platforms and to improve the efficiency of polarization diversity systems, this paper proposed a polarization beam splitting-rotation-multiplexing integrated device based on Asymmetric Directional Coupler(ADC) and Subwavelength Gratings(SWG) with a thick silicon core layer is proposed, which can convert any input light into a output light of Fundamental Transverse Electric(TE) Mode. The integrated device consists of three parts: polarization beam splitter, polarization rotator and wave combiner. The Three-Dimensional Finite Difference Time Domain(3 D-FDTD) method is used for simulation analysis, and the structural parameters are optimized. The size of the device is 4.5 μm×56.0 μm. At the input wavelength of 1.55 μm, it has a high polarization extinction ratio of 45 dB, and an insertion loss of 0.53 dB. A bandwidth of 75 nm is achieved when the polarization extinction ratio is greater than 30 dB and the insertion loss is less than 1 dB. Therefore, the operating frequency range of the device can cover the entire C-band. Finally, the influence of process error on device performance is analyzed. The integrated device has a compact structure and a higher polarization extinction ratio, which can meet the requirements of modern optical communication and optical integrated systems.

关 键 词：集成光学器件 光波导 偏振分束器 偏振旋转器 合波器 

分 类 号：TN256[电子电信—物理电子学]