Microwave Frequency Comb Generation by Gain-Switching Versus Relaxation Oscillations
| Autor: | David S. Citrin, Anton V. Kovalev, Alexandre Locquet, Evgeny A. Viktorov, Shariful Islam |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Laser diode Relaxation (NMR) Physics::Optics Inverse 02 engineering and technology Laser Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Gain-switching 020210 optoelectronics & photonics law 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Atomic physics Maser Spectroscopy Microwave |
| Zdroj: | IEEE Photonics Technology Letters. 33:491-494 |
| ISSN: | 1941-0174 1041-1135 |
| DOI: | 10.1109/lpt.2021.3068327 |
| Popis: | Optoelectronic feedback on a laser diode is demonstrated to generate two distinct modes of periodic pulse-train formation depending on the injection current $J$ of the laser leading to microwave combs in two distinct regimes. For $J$ close to the threshold current $J_{th}$ , the pulse repetition rate $f_{\mathrm{ rep}}$ is the inverse of the loop delay. This behavior is attributed to feedback-induced gain-switching and leads to comb spacings in the tens of MHz range. In contrast, for $J \simeq 2J_{th}$ , the repetition rate $f_{\mathrm{ rep}}$ is observed to be related to the relaxation-oscillation frequency $f_{\mathrm{ RO}}$ . The potential to generate pulse trains and associated microwave combs may find use in metrology, optical communications, optical sampling, and spectroscopy. |
| Databáze: | OpenAIRE |
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