On-chip optical frequency combs could revolutionize a vast range of applications such as optical atomic clocks , astronomy [2,3], coherent optical communication [4,5], ultrafast distance measurements by means of LIDAR [6–9], spectroscopy , and integrated microwave photonics [11,12]. It could also be applied in optical neural computing [13,14] and quantum optics [15,16]. Silicon nitride () has been the main platform for optical comb generation by way of Kerr nonlinearity as the material combines the lowest linear loss with a relatively high refractive index and strong Kerr effect among many material platforms . is widely used in microelectronic and photonic fabrication flows, making it a readily acceptable candidate for monolithic integration with active photonic components and high-frequency electronics, which would be key to the practical applications of optical comb sources.
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