Quantum-Cascade Lasers in Atmospheric Optical Communication Lines: Challenges and Prospects (Review)
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Journal of Applied Spectroscopy, Vol. 87, No. 4, September, 2020 (Russian Original Vol. 87, No. 4, July–August, 2020)
QUANTUM-CASCADE LASERS IN ATMOSPHERIC OPTICAL COMMUNICATION LINES: CHALLENGES AND PROSPECTS (REVIEW) P. I. Abramov, A. S. Budarin, E. V. Kuznetsov, and L. A. Skvortsov*
UDC 621.373.8
The parameters of prospective samples of atmospheric optical communication lines (AOCL) or free-space optics (FSO) based on quantum-cascade lasers (QCL) as compared to those of existing commercial systems are analyzed. The results indicate that the use of QCL in FSO has significant advantages over existing systems, due largely to longwave radiation and the QCL modulation dynamics, which are limited by the picosecond lifetime of current carriers that provides the fundamental possibility of obtaining an inherent bandwidth of ≥100 GHz. Possible applications of FSO based on IR QCL and THz QCL are discussed taking into account the experimental data and unique properties of QCL radiation. Also, the use of non-traditional methods to eliminate the influence of turbulence and increase the capacity of the information transmission channel is discussed. Keywords: atmospheric optical communication lines (AOCL), free-space optics (FSO), quantum-cascade lasers (QCL), atmospheric turbulence, "twisted" light. Table of Contents Introduction. Properties of QCL radiation determining the possibility of using it in FSO. General characteristics of the passage of laser radiation through the atmosphere. Absorption. Transparency windows. General issues related to light scattering. Kruse empirical model. Atmospheric turbulence. Choice of radiation source wavelength for FSO. Brief information on radiation sources and photodetectors used in commercial FSO. Experimental basis for the choice of radiation source wavelength for FSO. Examples of practical implementation of IR QCL FSO. IR QCL FSO. Prospects and possible applications of FSO based on terahertz QCL. Nontraditional methods for eliminating turbulence effects and increasing the capacity of the information transmission channel. Conclusion. Introduction. Open optical transmission systems, i.e., atmospheric optical communications lines (AOCL) or freespace optics (FSO), have in the last decades become an important application of optoelectronics technology. High-frequency modulated light pulses are used to produce a broadband communications channel for transmitting data through the atmosphere [1–7]. FSO operate in the IR spectral region and can provide links with very rapid data transmission rates (tens of Gb/s) between various platforms separated by several kilometers near sea level or >100 km at higher elevations [4]. _____________________ *
To whom correspondence should be addressed.
JSC Polyus Research Institute of M. F. Stelmakh, Moscow, 117342, Russia; email: [email protected]. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 87, No. 4, pp. 515–539, July–August, 2020. Original article submitted April 22, 2020. 0021-9037/20/8704-0579 ©2020 Springer Science+Business Media, LLC
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