Comparison of Silicon Lattice-Filter-Based O-Band 1x8 (De)Multiplexers With Flat and Gaussian-Like Passbands

被引：6
作者：
Ning, Nannan [1 ]
Wang, Xiaofei [1 ]
Yu, Hui [1 ,2 ]
Huang, Qikai [1 ]
Wang, Yuehai [1 ]
Yang, Jianyi [1 ]
机构：
[1] Zhejiang Univ, Coll Informat Sci & Elect Engn, Hangzhou 310027, Peoples R China
[2] Zhijiang Lab, Hangzhou 311121, Peoples R China
来源：
IEEE PHOTONICS JOURNAL | 2022年 / 14卷 / 02期
关键词：
Passband; Lattices; Optical waveguides; Digital filters; Optical fiber filters; Insertion loss; Crosstalk; Silicon photonics; wavelength filtering devices; wavelength multiplexer; directional coupler; CWDM;
D O I：
10.1109/JPHOT.2022.3149320
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：
Based on cascaded Mach-Zehnder interferometer (MZI) lattice filters, we demonstrate and compare silicon O-band 8-channel (de-)multiplexers with flat and Gaussian-like passbands for the 400 GBASE-LR8 norm. The 1x8 (de-)multiplexer with flat passbands exhibit insertion loss less than 2.5 dB, channel crosstalk lower than -11 dB, and 3 dB bandwidths of similar to 3.9 nm. In contrast, the maximum insertion loss, the worst channel crosstalk, and 3 dB bandwidths of the 1x8 (de-)multiplexer with Gaussian-like passbands are 1.1 dB, -13 dB, and similar to 2.9 nm, respectively. The comparison result indicates that the latter is more advisable choice. A theoretical calculation based on measured coupling ratios of stand-along directional couplers (DC) indicates that the performance deteriorations of practical filtering curves are mainly caused by dispersions and fabrication errors of the DCs.
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页数：5
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