Parallel Coded Optical Vortex Beam Free-Space Communication Based on Single-Photon Detection

Zhang, Qiongqiong; Pang, Chengkai; Yang, Lei; Li, Zhaohui; Huang, Haoyu; Wu, Guang

doi:10.1109/jphot.2022.3164531

Cited by 6 publications

(3 citation statements)

References 27 publications

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“…Through the use of these properties, VVMs can offer theoretically infinite number of eigen states and therefore have capability of providing enhanced spectral efficiency in wireless communication links. The properties of these waves are of scientific and engineering interests due to their applications in communication [7][8][9][10] , quantum technology [11][12][13] and radar and imaging [14][15][16][17] , which have arisen from similar applications in the optical frequency band. VVMs offer better SNR for free space communication in comparison to conventional waves 18 .…”

Section: Generation Of Vector Vortex Wave Modes In Cylindrical Wavegu...mentioning

confidence: 99%

Generation of vector vortex wave modes in cylindrical waveguides

Islam

Gaire

Madanayake

et al. 2023

Sci Rep

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In this paper, we propose a method to generate Vector Vortex Modes (VVM) inside a metallic cylindrical waveguide at microwave frequencies and demonstrate the experimental validation of the concept. Vector vortex modes of EM waves can carry both spin and orbital angular momentum as they propagate within a tubular medium. The existence of such waves in tubular media can be beneficial to wireless communication in such structures. These waves can carry different orbital angular momentum and spin angular momentum, and therefore, they feature the ability to carry multiple orthogonal modes at the same frequency due to spatial structure of the phase and polarization. In essence, high data rate channels can be developed using such waves. In free space, Orbital Angular Momentum carrying vortex waves have beam divergence issues and a central field-minima, which makes these waves unfavorable for free space communication. But vector vortex mode waves in guided structures do not suffer from these drawbacks. This prospect of enhancement of communication spectrum in waveguides provides the background for the study of vortex wave in circular waveguides. In this work, new feed structures and a radial array of monopoles are designed to generate the VVM carrying waves inside the waveguide. The experimental findings on the distribution of the amplitude and phase of the electromagnetic fields inside the waveguide are presented and the relationship between the waveguide fundamental modes and VVMs are discussed for the first time. The paper also presents methods for varying the cutoff frequency of the VVMs by introducing dielectric materials in the waveguide.

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Section: Generation Of Vector Vortex Wave Modes In Cylindrical Wavegu...mentioning

confidence: 99%

Generation of vector vortex wave modes in cylindrical waveguides

Islam

Gaire

Madanayake

et al. 2023

Sci Rep

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“…At present, the modulation methods of space laser communication mainly include switch keying (OOK) modulation, pulse interval modulation (PIM), single pulse position modulation (LPPM), differential pulse position modulation (DPPM), pulse amplitude modulation (PAM), etc. [22][23][24][25]. Among these modulation modes, the OOK mode has the simplest modulation principle, but its average transmission power is large.…”

Section: Introductionmentioning

confidence: 99%

Free Space Optical Communication Networking Technology Based on a Laser Relay Station

Ding

Wang

et al. 2023

Applied Sciences

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Optical communication modulation technology and networking technology are two important technologies for constructing free-space optical (FSO) communication. In this paper, pulse width modulation (PWM) is used to realize free-space optical communication. The process of signal modulation and demodulation is implemented by means of a field programmable gate array (FPGA). An optical communication relay system is constructed to realize communication networking. The binary data bits in the communication process are converted into pulse signals of different widths, the data demodulation process is realized by sampling with a high-speed analog-to-digital converter (ADC), the data level is determined by counting the proportion of high and low voltages sampled in a pulse period. The relay system analyzes the routing target after receiving the pulse signal from the transmitter, and then sends the data to the target receiver. The experimental results show that the constructed system can achieve point-to-multipoint free-space optical communication. Additionally, using ADC to demodulate the received signal increases the stability of the free-space optical communication system. This system provides the design prototype system of FSO communication networking technology.

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“…Papers [16][17][18] were devoted to the application of OVs for trapping and rotating microscopic particles. Another promising area for the use of OVs is optical communications and secure data transmission [19,20]. The paper [21] investigated optical vortices in nanophotonics.…”

Section: Introductionmentioning

confidence: 99%

Geometric Progression of Optical Vortices

et al. 2022

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We study coaxial superpositions of Gaussian optical vortices described by a geometric progression. The topological charge (TC) is obtained for all variants of such superpositions. The TC can be either integer or half-integer in the initial plane. However, it always remains integer when the light field propagates in free space. In the general case, the geometric progression of optical vortices (GPOV) has three integer parameters and one real parameter, values which define its TC. The GPOV does not conserve its intensity structure during propagation in free space. However, the beam can have the intensity lobes whose number is equal to one of the family parameters. If the real GPOV parameter is equal to one, then all angular harmonics in the superposition are of the same energy. In this case, the TC of the superposition is equal to the order of the average angular harmonic in the progression. Thus, if the first angular harmonic in the progression has the TC of k and the last harmonic has the TC of n, then the TC of the entire superposition in the initial plane is equal to (n + k)/2, but the TC is equal to n during propagation. The experimental results on generating of the GPOVs by a spatial light modulator are in a good agreement with the simulation results.

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Parallel Coded Optical Vortex Beam Free-Space Communication Based on Single-Photon Detection

Cited by 6 publications

References 27 publications

Generation of vector vortex wave modes in cylindrical waveguides

Generation of vector vortex wave modes in cylindrical waveguides

Free Space Optical Communication Networking Technology Based on a Laser Relay Station

Geometric Progression of Optical Vortices

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