Monolithic photonic circuits for Kerr frequency comb generation, filtering and modulation

Abstract

Microresonator Kerr frequency combs, which rely on third-order nonlinearity (${\chi }^{(3)}$), are of great interest for a wide range of applications including optical clocks, pulse shaping, spectroscopy, telecommunications, light detection and ranging (LiDAR) and quantum information processing. Many of these applications require further spectral and temporal control of the generated frequency comb signal, which is typically accomplished using additional photonic elements with strong second-order nonlinearity (${\chi }^{(2)}$). To date these functionalities have largely been implemented as discrete off-chip components due to material limitations, which come at the expense of extra system complexity and increased optical losses. Here we demonstrate the generation, filtering and electro-optic modulation of a frequency comb on a single monolithic integrated chip, using a thin-film lithium niobate (LN) photonic platform that simultaneously possesses large ${\chi }^{(2)}$ and ${\chi }^{(3)}$ nonlinearities and low optical losses. We generate broadband Kerr frequency combs using a dispersion-engineered high quality factor LN microresonator, select a single comb line using an electrically programmable add-drop filter, and modulate the intensity of the selected line. Our results pave the way towards monolithic integrated frequency comb solutions for spectroscopy data communication, ranging and quantum photonics.

arXiv comment7 pages,5 figures

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• Packaged photonic chip-based soliton microcomb using an ultralow-noise laser
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• Advanced dispersion engineering of a III-Nitride micro-resonator for a blue/UV frequency comb
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• Temperature-insensitive fused-tapered fiber couplers based on negative thermal expansion material coating
• Integrated Photonic Devices in Thin-Film Barium Titanate: Opportunities and Challenges
• High quality factor silicon-on-lithium niobate metasurfaces for electro-optically reconfigurable wavefront shaping