Self-similar picosecond pulse compression for supercontinuum generation at mid-infrared wavelength in silicon strip waveguides

被引：0

作者：

Cheng, Yujun ^{[1
]}

Yuan, Jinhui ^{[1
,2
]}

Mei, Chao ^{[1
]}

Li, Feng ^{[2
]}

Kang, Zhe ^{[2
]}

Yan, Binbin ^{[1
]}

Zhou, Xian ^{[3
]}

Wu, Qiang ^{[4
]}

Wang, Kuiru ^{[1
]}

Sang, Xinzhu ^{[1
]}

Long, Keping ^{[3
]}

Yu, Chongxiu ^{[1
]}

Farrell, Gerald ^{[5
]}

机构：

[1] State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, China

[2] Photonics Research Centre, Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hong Kong

[3] Department of Computer and Communication Engineering, University of Science and Technology Beijing, Beijing, China

[4] Department of Physics and Electrical Engineering, Northumbria University, Newcastle upon Tyne, United Kingdom

[5] Photonics Research Centre, Dublin Institute of Technology, Dublin, Ireland

来源：

Optics Communications | 2020年 / 454卷

关键词：

Self-similar pulse compression has important application in highly coherent supercontinuum (SC) generation. In this paper; we numerically present the mid-infrared self-similar picosecond pulse compression in a tapered suspended silicon strip waveguide; which is designed with exponentially decreasing dispersion profile along the direction of propagation. When the variation of the Kerr nonlinear coefficient γ(z); linear and nonlinear losses; higher-order nonlinearity; and higher-order dispersion are taken into consideration; the simulation result shows that a 1 ps input pulse centered at wavelength 2.8μm could be self-similarly compressed to 47.06 fs in a 3.9-cm waveguide taper; along with a compression factor Fc of 21.25; quality factor Qc of 0.78; and negligible pedestal. After that; the compressed pulse is launched into a uniform silicon strip waveguide; which is used for the generation of SC. We numerically demonstrate that the coherence of the generated SC by the compressed pulse can be significantly improved when compared to that generated directly by the picosecond pulse. The simulation results can be used to realize on-chip mid-infrared femtosecond light source and highly coherent supercontinuum; which can promote the development of on-chip nonlinear optics. © 2019;

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