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

作者：Rai Kou, Atsushi Ishizawa, Koki Yoshida, Noritsugu Yamamoto, Xuejun Xu, Yugo Kikkawa, Kota Kawashima, Takuma Aihara, Tai Tsuchizawa, Guangwei Cong, Kenichi Hitachi, Tadashi Nishikawa, Katsuya Oguri, Koji Yamada · 发表于：Optics Express · 年份：2023 · DOI：10.1364/oe.478481 · 被引用次数：14 · 研究领域：Advanced Fiber Laser Technologies、Photonic and Optical Devices、Advanced Fiber Optic Sensors

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 10 , and TE 01 modes.