Inverse-designed ultra-compact high efficiency and low crosstalk optical interconnect based on waveguide crossing and wavelength demultiplexer

• Published in: Scientific reports Vol. 11; no. 1; p. 12842
• Main Authors: Xu, Yanhong, Huang, Jie, Yang, Lina, Ma, Hansi, Yuan, Huan, Xie, Tong, Yang, Junbo, Zhang, Zhenrong
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 18.06.2021; Nature Publishing Group; Nature Portfolio
• Subjects: 639/624/1075/401; 639/624/399/1099; Design; Humanities and Social Sciences; Interconnect; Military communications; multidisciplinary; Science; Science (multidisciplinary); Wavelength
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-021-92038-w

In this paper, we use the inverse design method to design an optical interconnection system composed of wavelength demultiplexer and the same direction waveguide crossing on silicon-on-insulator (SOI) platform. A 2.4 μm × 3.6 μm wavelength demultiplexer with an input wavelength of 1.3–1.6 μm is designed. When the target wavelength of the device is 1.4 μm, the insertion loss of the output port is − 0.93 dB, and there is − 18.4 dB crosstalk, in TE 0 mode. The insertion loss of the target wavelength of 1.6 μm in TE 0 mode is − 0.88 dB, and the crosstalk is − 19.1 dB. Then, we designed a same direction waveguide crossing, the footprint is only 2.4 μm × 3.6 μm, the insertion loss of the wavelength 1.4 μm and 1.6 μm in TE 0 mode is − 0.99 dB and − 1 dB, and the crosstalk is − 12.14 dB and − 14.34 dB, respectively. Finally, an optical interconnect structure composed of two devices is used, which can become the most basic component of the optical interconnect network. In TE 0 mode, the insertion loss of the output wavelength of 1.4 μm at the output port is − 1.3 dB, and the crosstalk is − 29.36 dB. The insertion loss of the output wavelength of 1.6 μm is − 1.39 dB, and the crosstalk is − 38.99 dB.