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 2022
Xiaodan Pang, Richard Schatz, Joharifar Mahdieh, Udalcovs Aleksejs, Vjačeslavs Bobrovs, Zhang Lu, Yu Xianbin, Sun Yan-Ting, Maisons Gregory, Carras Mathieu, Sergei Popov, Lourdudoss Sebastian

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 promisingtechnological choice. In this work, we present an experimental demonstration of a mid-IR FSO link enabled by a 4.65-μm directly modulated (DM) 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 | mid-infrared photonics | quantum cascade laser

Pang, X., Schatz, R., Mahdieh, J., Aleksejs, U., Bobrovs, V., Lu, Z., Xianbin, Y., Yan-Ting, S., Gregory, M., Mathieu, C., Popov, S., Sebastian, L. 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, 2022, 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)
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