With the contribution from the Head of the Institute of Telecommunications research paper “Directly modulated quantum cascade laser and its application in free-space communications” is accepted and presented at the Photonics Asia conference.
What the presentation is about?
This report summarizes 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). Research experimentally demonstrates 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.
Who is the presenter?
Xiaodon Pang presented the research at Photonics Asia. He is from the KTH Royal Institute of Technology (Sweden), RISE Research Institutes of Sweden (Sweden).
Xiaodan Pang received a PhD degree from DTU Fotonik, the Technical University of Denmark in 2013. He is currently working as a Senior Researcher at the Department of Applied Physics, KTH Royal Institute of Technology, Sweden from Mar. 2020.
This Photonics Asia link gives more information on the resume of Ph.D. Xiaodan Pang.
SPIE/COS Photonics Asia is an annual symposium in partnership with the Chinese Optical Society (COS) that provides an international showcase for the latest research in biomedical optics, advanced optical imaging, quantum and nonlinear optics, laser processing, plasmonics, holography, and more.
Photonics Asia homepage provides more information on the conference.
Find out more on the research of the Institute of Telecommunications on the projects page and blog page related to research papers.