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9 October 2021 Directly modulated quantum cascade laser and its application in free-space communications
Xiaodan Pang, Richard Schatz, Mahdieh Joharifar, Aleksejs Udalcovs, Vjaceslavs Bobrovs, Lu Zhang, Xianbin Yu, Yan-Ting Sun, Sergei Popov, Sebastian Lourdudoss, Oskars Ozolins
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Proceedings Volume 11894, Optoelectronic Devices and Integration X; 118940A (2021) https://doi.org/10.1117/12.2602236
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China
Abstract
In this report, we summarize our recent achievements in free-space communications in the mid-infrared (MIR) region enabled by directly modulated quantum cascaded laser (QCL) at 4.65 µm (~65 THz). We have experimentally demonstrated a multigigabit free-space transmission link in the lab environment with the QCL operating at room temperature. The QCL chip is mounted on a commercial QCL mount with a water-cooled Peltier element. Multilevel modulation formats at different baud rates are generated and combined with the laser driving current at a custom-made bias-tee to drive and modulate the QCL. A commercial mercury cadmium telluride (MCT, HgCdTe) photovoltaic (PV) MIR detector with a built-in trans-impedance amplifier was used to receive the MIR free-space signal. With the receiver to be the bottleneck of the system bandwidth, the end-to-end 3-dB bandwidth was measured to be around 320 MHz, and the 6-dB bandwidth was around 450 MHz. We have successfully demonstrated up to 6 Gbps free space transmission with multilevel modulation formats, assisted with effective digital equalization techniques despite the limited bandwidth.
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Xiaodan Pang, Richard Schatz, Mahdieh Joharifar, Aleksejs Udalcovs, Vjaceslavs Bobrovs, Lu Zhang, Xianbin Yu, Yan-Ting Sun, Sergei Popov, Sebastian Lourdudoss, and Oskars Ozolins "Directly modulated quantum cascade laser and its application in free-space communications", Proc. SPIE 11894, Optoelectronic Devices and Integration X, 118940A (9 October 2021); https://doi.org/10.1117/12.2602236
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KEYWORDS
Quantum cascade lasers
Modulation
Mid-IR
Free space optics
Signal detection
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