A method for improving information capacity of a signal with variant polarization effects for communication systems in the optical and radio bands

DOI: 10.31673/2412-9070.2021.053439

Abstract

Promising communication systems are developing in the direction of complicating the configuration of networks, expanding the spectrum of signals, and integrating terrestrial, satellite, fiber, and open optical technologies. However, the use of information signal modulation methods remains traditional, which are based on changing parameters in the time domain, such as amplitude, frequency, and phase. Spatial signal modulation techniques have not been effectively used in wireless communication systems. Broader proposals find only polarization-based methods for increasing the multiplexing factor and in binary information transmission systems where two states of linear polarization with a shift of π/2 are used. Polarizing complex signal processing technologies, converting radio signals into optical domains, are promising methods for increasing the spectral efficiency as well as reducing the influence of the atmosphere. The use of complex schemes for modulating the polarization state becomes possible due to the development of polarization-sensitive quantum materials sensitive to light helicity. The paper analyzes the theoretical validity of the effectiveness of spatial modulation parameters to increase the information capacity of signals. The ways of increasing the information capacity of signals, the fundamental schemes of fiber-ether transmission in the optical and radio bands, including in the millimeter band, using polarization effects for spatial modulation of information signals, are analyzed. Schematic diagrams for the formation of radio-frequency pulses in the optical range with spatial modulation using polarization effects are proposed. Similar schemes using wireless sections of the network in the optical and highfrequency radio bands, and fiber lines can be used both in small scale terrestrial networks and in global coverage.

Keywords: spatial modulation; information capacity; polarization signal; radio-over-fiber; millimeter wave; telecommunication systems.

References
1. Karafolas N. Near-Earth Laser Communications, CRC Press, 2nd Edition, 2020.
2. Morant M., Llorente R. Performance Analysis of Carrier-Aggregated Multiantenna 4 × 4 MIMO LTEA Fronthaul by Spatial Multiplexing on Multicore Fiber // J. Lightw. Technol. Jan. 2018. vol. 36, no. 2. Р. 594–600.
3. Kremenetskaya Y. A., Markov S. E., Melnyk Yu. V. Structural optimization of optoelectronic components in millimeter-wave radio-transmitting modules //Semiconductor Physics, Quantum Electronics & Optoelectronics. 2020. vol. 23, no. 4. Р. 424–430.
4. Seamless fiber-wireless bridge in the millimeter- and terahertz-wave bands / A. Kanno, P. T. Dat, N. Sekine [et al.] // J. Lightw. Technol. Oct. 2016. vol. 34. P. 4794–4801.
5. Review on the Millimeter-Wave Generation Techniques Based on Photon Assisted for the RoF Network System / J. Xiao, C. Zhao, X. Feng [et al.] // Advances in Condensed Matter Physics, 2020.
6. Evolution of radio-over-fiber technology / C. Lim, Y. Tian, C. Ranaweera [et al.] // J. Lightw. Technol. 2019. vol. 37, no. 6. P. 1647–1656.
7. RF fading circumvention using a polarization modulator for supporting W-band RoF transport from 85 to 95 GHz / R.-K. Shiu, S.-J. Su, Y.-W. Chen [et al.] // Proc. Opt. Fiber Commun. Conf. Exhib., 2020. P. 1–3.
8. Elsayed E. E., Yousif B. B. Performance enhancement of hybrid diversity for M-ary modified pulseposition modulation and spatial modulation of MIMO-FSO systems under the atmospheric turbulence effects with geometric spreading // Opt. Quantum Electron. 2020. vol. 52. P. 1–18.
9. Magidi S., Jabeena A. Analysis of multi-pulse position modulation free space optical communication system employing wavelength and time diversity over Malaga turbulence channel // Sci. Afr. 2021. vol. 12, e00777.
10. Trisno S., Davis C. C. Performance of free space optical communication systems using polarization shift keying modulation // Proc. SPIE Int. Soc. Opt. Eng. 2006. P. 6304.
11. Kononyuk A. E. Fundamentals of scientific research (general theory of experiment). Book 1. Kyiv: Osvita Ukrainy, 2011.
12. Toyoda I. Polarization modulation // Modulation in Electronics and Telecommunications, 2019.
13. Optical generation scheme of microwave signals with multiple modulation formats / W. Guodong, Z. Shanghong, L. Xuan [et al.] // J. Infrared and Laser Engineering. 2019. vol. 48, no 6. P. 622002–0622002.