Agile THz-range spectral multiplication of frequency combs using a multi-wavelength laser

Shahab Abdollahi (), Mathieu Ladouce, Pablo Marin-Palomo and Martin Virte ()
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Shahab Abdollahi: Vrije Universiteit Brussel (VUB)
Mathieu Ladouce: Vrije Universiteit Brussel (VUB)
Pablo Marin-Palomo: Vrije Universiteit Brussel (VUB)
Martin Virte: Vrije Universiteit Brussel (VUB)

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract A breakthrough technology, on-chip frequency comb sources offer broadband combs while being compact, energy-efficient, and cost-effective solutions for various applications from lidar to telecommunications. Yet, these sources encounter a fundamental trade-off between controllability and bandwidth: broadband combs, generated in microresonators, lack free-spectral range or spectral envelope control, while combs generated with electro-optic modulators can be carefully tailored but are limited in bandwidth. Here, we overcome this trade-off through agile spectral multiplication of narrowband combs. Exploiting the nonlinear dynamics of a multi-wavelength laser under modulated optical injection, we achieve spectral multiplication at frequency offsets from 26 GHz to 1.3 THz. Moreover, on-chip control allows for nano-second switching of the frequency offset. Compatible with generic platforms, our approach can be scaled up to cover several THz. When combined with THz photomixers, our system could enable low-cost, compact, and power-efficient THz comb sources, paving the way towards a new generation of THz applications.

Date: 2024
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DOI: 10.1038/s41467-024-45610-7

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