High-Speed 9.6-μm Long-Wave Infrared Free-Space Transmission with a Directly-Modulated QCL and a Fully-Passive QCD
Journal of Lightwave Technology 2023
Joharifar Mahdieh, Dely Hamza, Xiaodan Pang, Schatz Richard, Gacemi Djamal, Toms Salgals, Aleksejs Udalcovs, Sun Yan-Ting, Fan Yuchuan, Zhang Lu, Rodriguez Etienne, Sandis Spolītis, Vjačeslavs Bobrovs, Yu Xianbin, Lourdudoss Sebastian, Popov Sergei, Vasanelli Angela, Oskars Ozoliņš, Sirtori Carlo

Free-space optics (FSO) in the mid-infrared (mid-IR) contains rich spectral resources for future ultrahigh-speed wireless communications yet is currently under-exploited. Two atmospheric transmission windows at the mid-IR, namely, the mid-wave IR (MWIR, 3-5 μm) and the long-wave IR (LWIR, 8-12 μm), show great potential in supporting free-space communications for both terrestrial and space application scenarios. Particularly, the LWIR signal with a longer wavelength has high intrinsic robustness against aerosols' scattering and turbulence-induced scintillation and beam broadening effects, which are the main concerns hindering the wide deployment of practical FSO systems. In this context, high-bandwidth semiconductor-based mid-IR FSO transceivers will be desirable to meet the requirements of low energy consumption and small footprints for large-volume development and deployment. Quantum cascade devices, including quantum cascade lasers (QCLs) and quantum cascade detectors (QCDs), appear promising candidates to fulfill this role. In this work, we report a high-speed LWIR FSO transmission demonstration with a 9.6-μm directly-modulated (DM)-QCL and a fully passive QCD without any active cooling or bias voltage. Up to 8 Gb/s, 10 Gb/s, and 11 Gb/s signal transmissions are achieved when operating the DM-QCL at 10 °C, 5 °C, and 0 °C, respectively. These results indicate a significant step towards an envisioned fully-connected mid-IR FSO solution empowered by the quantum cascade semiconductor devices.

Atslēgas vārdi
Free-space optics | long-wave infrared | quantum cascade detector | quantum cascade laser

Mahdieh, J., Hamza, D., Pang, X., Richard, S., Djamal, G., Salgals, T., Udalcovs, A., Yan-Ting, S., Yuchuan, F., Lu, Z., Etienne, R., Spolītis, S., Bobrovs, V., Xianbin, Y., Sebastian, L., Sergei, P., Angela, V., Ozoliņš, O., Carlo, S. High-Speed 9.6-μm Long-Wave Infrared Free-Space Transmission with a Directly-Modulated QCL and a Fully-Passive QCD. Journal of Lightwave Technology, 2023, Vol. 41, No. 4, 1087.-1094.lpp. ISSN 0733-8724. e-ISSN 1558-2213. Pieejams: doi:10.1109/JLT.2022.3207010

Publikācijas valoda
English (en)
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