Tunable on-chip electro-optic frequency-comb generation at 8 {\mu}m wavelength
| Autor: | Turpaud, Victor, Nguyen, Thi-Hao-Nhi, Koompai, Natnicha, Peltier, Jonathan, Frigerio, Jacopo, Calcaterra, Stefano, Coudevylle, Jean-René, Bouville, David, Alonso-Ramos, Carlos, Vivien, Laurent, Isella, Giovanni, Marris-Morini, Delphine |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | Dual-comb spectroscopy is a powerful technique to measure optical spectra in a wide spectral range with high-frequency resolution. The development of compact systems operating in the long-wave infrared wavelength range is of high interest for spectroscopic and sensing applications. Amongst the different techniques to obtain optical frequency-combs, electro-optic frequency-comb generation presents major advantages thanks to the tunable repetition rate only limited by the bandwidth of the used electro-optical modulator. However, the development of integrated and efficient electro-optical modulators operating in a wide long-wave infrared spectral band is still at its infancy, and electro-optical frequency-comb has not been demonstrated so far beyond the telecom band. In this work, a Schottky-based modulator embedded in a Ge-rich graded SiGe waveguide is used for electro-optic frequency-comb generation. Considering the limited efficiency of the modulator, harmonically-rich RF signals are used to enhance the generation of comb lines around the optical carrier. Interestingly, this allows us to demonstrate the generation of electro-optical combs spanning over 2.4 GHz around 8 {\mu}m wavelength. This paves the way towards fully integrated and tunable mid-infrared electro-optic frequency-comb generation systems. Comment: 10 pages, 9 figures |
| Databáze: | arXiv |
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