Direct Modulation and Free-Space Transmissions of up to 6 Gbps Multilevel Signals with a 4.65-μm Quantum Cascade Laser at Room Temperature
Journal of Lightwave Technology 2021
Xiaodan Pang, Richard Schatz, Mahdieh Joharifar, Aleksejs Udaļcovs, Vjačeslavs Bobrovs, Lu Zhang, Xianbin Yu, Yan-Ting Sun, Gregory Maisons, Mathieu Carras, Sergei Popov, Sebastian Lourdudoss, Oskars Ozoliņš

A roadmap for future wireless communications is expected to exploit all transmission-suitable 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 as the fixed wireless access and the wireless mobile backhaul. 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
Free-space communication, quantum cascade laser, mid-infrared photonics

Pang, X., Schatz, R., Joharifar, M., Udaļcovs, A., Bobrovs, V., Zhang, L., Yu, X., Sun, Y., Maisons, G., Carras, M., Popov, S., Lourdudoss, S., Ozoliņš, O. Direct Modulation and Free-Space Transmissions of up to 6 Gbps Multilevel Signals with a 4.65-μm Quantum Cascade Laser at Room Temperature. Journal of Lightwave Technology, 2021, Vol. 40, No. 8, 2370.-2377.lpp. ISSN 0733-8724. e-ISSN 1558-2213. Pieejams: doi:10.1109/JLT.2021.3137963

Publikācijas valoda
English (en)
RTU Zinātniskā bibliotēka.
E-pasts:; Tālr: +371 28399196