High-speed tunable microwave-rate soliton microcomb

Yang He, Raymond Lopez-Rios, Usman A. Javid, Jingwei Ling, Mingxiao Li, Shixin Xue, Kerry Vahala and Qiang Lin ()
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Yang He: University of Rochester
Raymond Lopez-Rios: University of Rochester
Usman A. Javid: University of Rochester
Jingwei Ling: University of Rochester
Mingxiao Li: University of Rochester
Shixin Xue: University of Rochester
Kerry Vahala: California Institute of Technology
Qiang Lin: University of Rochester

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract Soliton microcombs are a promising new approach for photonic-based microwave signal synthesis. To date, however, the tuning rate has been limited in microcombs. Here, we demonstrate the first microwave-rate soliton microcomb whose repetition rate can be tuned at a high speed. By integrating an electro-optic modulation element into a lithium niobate comb microresonator, a modulation bandwidth up to 75 MHz and a continuous frequency modulation rate up to 5.0 × 1014 Hz/s are achieved, several orders-of-magnitude faster than existing microcomb technology. The device offers a significant bandwidth of up to tens of gigahertz for locking the repetition rate to an external microwave reference, enabling both direct injection locking and feedback locking to the comb resonator itself without involving external modulation. These features are especially useful for disciplining an optical voltage-controlled oscillator to a long-term reference and the demonstrated fast repetition rate control is expected to have a profound impact on all applications of frequency combs.

Date: 2023
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DOI: 10.1038/s41467-023-39229-3

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