Ms. Yuke Zhai Profile

Yuke Zhai

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Proceedings Article | 27 December 2022 Paper

On-chip octave-spanning flat supercontinuum in all-normal-dispersion silicon nitride waveguides

Kexin Ren, Yushuo Guo, Yuke Zhai, Lin Zhang

Proceedings Volume 12504, 1250409 (2022) https://doi.org/10.1117/12.2657001

KEYWORDS: Silicon, Waveguides, Dispersion, Wave propagation, Optical coherence tomography, Supercontinuum generation

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On-chip supercontinuum generation has attracted a great deal of attention in recent years. Among silicon-based materials, silicon nitride represents an attractive solution for on-chip supercontinuum generation due to its wide transparency window, relatively high Kerr nonlinearity, and negligible two-photon absorption. In this paper, we achieve a flat allnormal dispersion profile in the silicon nitride platform, with a flat dispersion from 600 nm to 2760 nm. Using the proposed waveguide, an ultra-flat (-6 dB) high-coherent octave-spanning supercontinuum covering from 638 nm to 1477 nm can be generated by launching a 250-fs 30-kW input pulse centered at 960 nm. The proposed supercontinuum is of great importance for achieving high-resolution optical coherence tomography and fully stabilized frequency comb sources.

Proceedings Article | 10 October 2020 Presentation + Paper

Broadband nonlinear manipulation of ultrafast optical pulses by dispersion engineering

Lijuan Xu, Yuhao Guo, Yuke Zhai, Henan Liu, Lin Zhang

Proceedings Volume 11547, 115470O (2020) https://doi.org/10.1117/12.2575501

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The formation and manipulation of ultrashort pulses on chip would be of great interest to ultrafast optics and integrated photonics. One of the important issues is dispersion-assisted nonlinear interactions of broadband frequency components. In this paper, we show for the first time that a bilayer waveguide for quasi-TE mode produces a quite flat and saddleshaped dispersion profile. Different from previously reported TE-mode waveguides with flattened dispersion, the proposed waveguide exhibits a greatly simplified structure with no need for a high-aspect-ratio slot and has quite small group delay difference in a wide spectral range with four zero-dispersion wavelengths (ZDWs). For the first time we study supercontinuum generation in hybrid dispersion regime, in which the broadened spectrum covers a bandwidth with all ZDWs. It is found that one can obtain greatly improved spectral flatness in supercontinuum generation, with a power variation as small as 3 dB over a bandwidth of <500 nm. Moreover, the proposed waveguides are particularly suitable for low-distortion pulse propagation over a long distance, which is important for on-chip ultrashort pulse delivery.

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