Frequency comb generation by combining on chip amplifier and Rayleigh mirror
Year: 2025
Type: article
Abstract: We propose a novel frequency comb source based on a high-Q integrated Si₃N₄ microring resonator (MRR) coupled to a semiconductor optical amplifier (SOA). By leveraging strong Rayleigh backscattering within the MRR, the system operates as a self-starting laser cavity, enabling coherent comb generation without the need for external laser pumping. Experimental characterization via optical spectrum analysis and autocorrelation measurements confirms the generation of dissipative Kerr solitons in the form of platicons, producing stable mode-locked pulses with durations on the order of 2 ps. Phase noise measurements reveal linewidths around 633 kHz, with room for improvement through enhanced mechanical and thermal stabilization. This approach offers a compact and simplified platform for frequency comb generation with potential applications in integrated photonics and spectroscopy.
DOI: 10.25781/kaust-gs4d5
Author: Albergo, Francesco
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7202268549