Ultra-Broadband Polarization Beam Splitter Based on Cascaded Mach-Zehnder Interferometers Assisted by Effectively Anisotropic Structures

被引:26
|
作者
Lin, Zongxing [1 ,2 ]
Chen, Kaixuan [1 ,3 ]
Huang, Qiangsheng [1 ]
He, Sailing [1 ,2 ,3 ]
机构
[1] Zhejiang Univ, Ctr Opt & Electromagnet Res, Natl Engn Res Ctr Opt Instruments, Zijingang Campus, Hangzhou 310058, Peoples R China
[2] Zhejiang Univ, Ningbo Res Inst, Ningbo 315100, Peoples R China
[3] South China Normal Univ, South China Acad Adv Optoelect, Ctr Opt & Electromagnet Res, Guangzhou 510006, Peoples R China
来源
IEEE PHOTONICS JOURNAL | 2021年 / 13卷 / 01期
基金
中国国家自然科学基金;
关键词
Polarization beam splitter (PBS); sub-wavelength grating (SWG); anisotropic metamaterial; ultra-broadband;
D O I
10.1109/JPHOT.2021.3050114
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
An ultra-broadband polarization beam splitter (PBS) consisting of cascaded Mach-Zehnder interferometers (MZIs) is proposed on 220 nm-thick silicon-on-insulator (SOI) platform. The configuration of the cascaded MZIs has a point symmetry in order to broaden the bandwidth of the cross-coupling for the TM polarization. The sub-wavelength grating (SWG) structures act as effectively anisotropic cladding to enhance the separation of the two fundamental polarizations. Two filters with cascaded bends and a Bragg reflection structure at the two outputs, respectively, are used to further improve the extinction ratio (ER). The proposed PBS has a remarkable performance with ER > 20 dB over a record broad bandwidth of 310 nm (IL < 0.5 dB) or 350nm (IL < 1 dB) for both TE and TM polarization inputs.
引用
收藏
页数:9
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