Supercontinuum generation is an extensively studied and arguably the most important and all-encompassing nonlinear phenomenon. Yet, we do not have a good control over all the signals generated in this process. Usually, a large part of an octave spanning spectrum has an orders of magnitude weaker signal than the peak to be useful for any application. In this work, we show strong signal generation within a supercontinuum generated in a complementary metal-oxide-semiconductor compatible silicon Bragg grating waveguide. We show up to 23 dB of signal enhancement over a 10 nm full-width-at-half-maximum bandwidth at the Bragg resonance in the telecom window. Additionally, the grating is made by depositing charge carriers periodically, thus avoiding any dimensional change in the waveguide, and it can allow other functionalities offered by the induced electric field, such as second harmonic generation and free carrier sweeping. We believe this work opens up an avenue for research in nonlinear integrated photonics and signal enhancement in the supercontinuum by the Bragg effect (whether created through grating formation with dimensional variation in insulators and/or periodic charge carrier doping in semiconductors).

中文翻译：

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硅布拉格光栅波导中的超连续谱生成

超连续谱的产生已被广泛研究，并且可以说是最重要，最广泛的非线性现象。但是，我们无法很好地控制此过程中生成的所有信号。通常，倍频程频谱的很大一部分信号比峰值弱一个数量级，可用于任何应用。在这项工作中，我们展示了在互补金属氧化物半导体兼容硅布拉格光栅波导中产生的超连续谱内的强信号产生。在电信窗口中的布拉格共振下，我们在10 nm半最大最大带宽上显示了高达23 dB的信号增强。此外，光栅是通过定期沉积电荷载流子制成的，从而避免了波导中尺寸的变化，它可以允许感应电场提供其他功能，例如二次谐波生成和自由载流子扫描。我们相信这项工作为布拉格连续效应中的非线性集成光子学和超连续谱中的信号增强（无论是通过光栅形成，绝缘体尺寸变化和/或半导体中周期性电荷载流子掺杂产生）开辟了一条途径。