Abstract
Microresonator Kerr frequency combs could provide miniaturised solutions for a wide range of applications. Many of these applications however require further manipulation of the generated frequency comb signal using photonic elements with strong second-order nonlinearity (χ(2)). To date these functionalities have largely been implemented as discrete components due to material limitations, which comes 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 nanophotonic lithium-niobate platform that simultaneously possesses large electro-optic (χ(2)) and Kerr (χ(3)) nonlinearities, and low optical losses. We generate broadband Kerr frequency combs using a dispersion-engineered high-Q lithium-niobate 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.
Highlights
Microresonator Kerr frequency combs could provide miniaturised solutions for a wide range of applications
We demonstrate wide-spanning (>700 nm) Kerr comb generation, electrically programmable filtering of a single comb line with a pump rejection ratio of 47 dB, and intensity modulation of the selected line at up to 500 Mbit s−1, all achieved on an LN photonic chip
In summary, we have demonstrated Kerr comb generation followed by spectral and temporal manipulation of the comb signal, all achieved on the same LN chip
Summary
Microresonator Kerr frequency combs could provide miniaturised solutions for a wide range of applications. Many of these applications require further manipulation of the generated frequency comb signal using photonic elements with strong second-order nonlinearity (χ(2)) To date these functionalities have largely been implemented as discrete components due to material limitations, which comes at the expense of extra system complexity and increased optical losses. Most frequency comb applications require, in addition to the comb generator, a variety of photonic components such as fast switches, modulators and/or nonlinear wavelength converters, which rely on strong second-order optical nonlinearity (χ(2))[4,5,9,12] To date these functionalities have largely been implemented as discrete off-chip components[4,5,9,12], which comes at the expense of extra system complexity and increased losses. While heterogeneous integration of photonic chips with different functionalities has been proposed to circumvent this problem[24], this approach requires scalable and low-loss optical links between chips, which is challenging
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