Spatially resolved multimode excitation for smooth supercontinuum generation in a SiN waveguide

We propose a method of supercontinuum light generation enhanced by multimode excitation in a precisely dispersion-engineered deuterated SiN (SiN:D) waveguide. Although a regularly designed SiN-based nonlinear optical waveguide exhibits anomalous dispersion with the fundamental and first-order multim...

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Bibliographic Details
Published in:Optics express 2023-02, Vol.31 (4), p.6088-6098
Main Authors: Kou, Rai, Ishizawa, Atsushi, Yoshida, Koki, Yamamoto, Noritsugu, Xu, Xuejun, Kikkawa, Yugo, Kawashima, Kota, Aihara, Takuma, Tsuchizawa, Tai, Cong, Guangwei, Hitachi, Kenichi, Nishikawa, Tadashi, Oguri, Katsuya, Yamada, Koji
Format: Article
Language:English
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Summary:We propose a method of supercontinuum light generation enhanced by multimode excitation in a precisely dispersion-engineered deuterated SiN (SiN:D) waveguide. Although a regularly designed SiN-based nonlinear optical waveguide exhibits anomalous dispersion with the fundamental and first-order multimode operation, the center-symmetric light pumping at the input edge has so far inhibited the full potential of the nonlinearity of SiN-based materials. On the basis of numerical analysis and simulation for the SiN:D waveguide, we intentionally applied spatial position offsets to excite the fundamental and higher-order modes to realize bandwidth broadening with flatness. Using this method, we achieved an SNR improvement of up to 18 dB at a wavelength of 0.6 µm with an offset of about 1 µm in the Y-axis direction and found that the contribution was related to the presence of dispersive waves due to the excitation of TE , and TE modes.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.478481