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

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

Supporting data demonstrating agile spectral multiplication of a narrowband comb in a multi-wavelength laser

Supporting data for our article entitled "Agile THz-range spectral multiplication of frequency combs using a multi-wavelength laser". Each file contain the data corresponding to a figure/panel of the article as indicated in the filename. - Fig2: we provide experimental data showing the evolution of the optical spectrum when varying the optical feedback phase. The two laser peaks being separated by 10 nm, the spectra are separated in two parts. - Fig3: we provide the data of the optical and RF spectra shown - Fig4: we provide the evolution of the high-resolution optical spectrum when varying the f_tone frequency. - Fig5: we provide the data for each of the 6 sub-panels for the two reported cases (a) and (b)