Up to 6 Gbps Mid-Infrared Free-Space Transmission with a Directly Modulated Quantum Cascade Laser
2021 European Conference on Optical Communication (ECOC 2021): Proceedings 2021
Xiaodan Pang, Richard Schatz, Mahdieh Joharifar, Aleksejs Udalcovs, Vjačeslavs Bobrovs, Lu Zhang, Xianbin Yu, Yan-Ying Sun, Sergei Popov, Sebastian Lourdudoss, Oskars Ozoliņš

A sustainable roadmap for future wireless communications is expected to include all applicable spectrum bands, from the microwave to the optical frequencies, to support orders of magnitude faster data transfer with much lower latency than the deployed solutions nowadays. The currently under-exploited mid-infrared (mid-IR) spectrum is an essential building block for such an envisioned all-spectra wireless communication paradigm. Free-space optical (FSO) communications in the mid-IR region have recently attracted great interest due to their intrinsic merits of low propagation loss and high tolerance of atmospheric perturbations. Future development of viable mid-IR FSO transceivers requires a semiconductor source to fulfill the high bandwidth, low energy consumption, and small footprint requirements. In this context, quantum cascade laser (QCL) appears as a promising technological choice. In this work, We present an experimental demonstration of a mid-IR FSO link enabled by a 4.65-μm directly modulated QCL operating at room temperature. We achieve a transmission data rate of up to 6 Gbps over a 0.5-m link distance. This achievement is enabled by system-level characterization and optimization of transmitter and receiver power level and frequency response and assisted with advanced modulation and digital signal processing (DSP) techniques. This work pushes the QCL-based FSO technology one step closer to practical terrestrial applications. Such a QCL-based solution offers a promising way towards the futuristic all-spectra wireless communication paradigm by potentially supporting the whole spectrum from the MIR to the terahertz (THz).

Atslēgas vārdi
Direct Modulation, Free-space Transmissions, Quantum Cascade Laser, Multilevel Signals

Pang, X., Schatz, R., Joharifar, M., Udalcovs, A., Bobrovs, V., Zhang, L., Yu, X., Sun, Y., Popov, S., Lourdudoss, S., Ozoliņš, O. Up to 6 Gbps Mid-Infrared Free-Space Transmission with a Directly Modulated Quantum Cascade Laser. No: 2021 European Conference on Optical Communication (ECOC 2021): Proceedings, Francija, Bordeaux, 12.-17. septembris, 2021. Piscataway: IEEE, 2021, 341.-344.lpp. ISBN 978-1-6654-1150-9. e-ISBN 978-1-6654-3868-1. Pieejams: doi:10.1109/ECOC52684.2021.9606059

Publikācijas valoda
English (en)
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