Orbital Angular Momentum Multiplexed Free-Space Optical Communication Systems Based on Coded Modulation

Qu, Zhen; Djordjević, Ivan B.

doi:10.3390/app8112179

Cited by 14 publications

(11 citation statements)

References 33 publications

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“…We studied the influence of different transmission distances, turbulence intensities, and topological charges on the phase. The simulation was carried out under FSO atmospheric turbulence [27], and the results are shown in Figure 3a. At the same turbulence intensity, the size of the light spot increases with the increase in transmission distance.…”

Section: Discussion On Transmission Performance Under the Turbulencementioning

confidence: 99%

Effects of Atmospheric Turbulence on OAM-POL-FDM Hybrid Multiplexing Communication System

Zhao¹,

Liu

Hao³

et al. 2019

Applied Sciences

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This paper proposes a 32-channel-hybrid-multiplexing system on atmospheric turbulence. With the utilization of the hybrid multiplexing of orbital angular momentum (OAM), polarization, and frequency, the communication speed of the system can be significantly improved, and this system can be well combined with the existing frequency division multiplexing (FDM) optical communication network. Within this communication system, we discuss the effects of different turbulence intensities on the phase, OAM crosstalk, spectrum, and bit error rate (BER) in turbulent channels. Under strong turbulence, 46.8% of the energy leaks to the neighbor OAM and become noise when multiple topological charge states are transmitted. The research reflects the impact of various parameters of the OAM hybrid multiplexing system under turbulence, which is closer to a practical application scenario and is significant for implementing OAM communication in the turbulence channel.

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Section: Discussion On Transmission Performance Under the Turbulencementioning

confidence: 99%

Effects of Atmospheric Turbulence on OAM-POL-FDM Hybrid Multiplexing Communication System

Zhao¹,

Liu

Hao³

et al. 2019

Applied Sciences

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“…To mitigate the atmospheric turbulence for OAM links, it is also possible to combine channel coding and adaptive optics wavefront correction, as shown in [289]- [291]. The authors of [289] first utilized a Shack-Hartmann OAM wavefront correction technique to reduce the turbulence induced intermodal crosstalk and then corrected the residual single OAM random errors using the BCH error correction codes.…”

Section: B Atmospheric Turbulence Effects Mitigationmentioning

confidence: 99%

“…The authors of [289] first utilized a Shack-Hartmann OAM wavefront correction technique to reduce the turbulence induced intermodal crosstalk and then corrected the residual single OAM random errors using the BCH error correction codes. Qu and Djordjevic also combined AO based wavefront correction with LDPC coding to compensate for intermodal crosstalk induced by atmospheric turbulence [290], [291].…”

Section: B Atmospheric Turbulence Effects Mitigationmentioning

confidence: 99%

Communicating Using Spatial Mode Multiplexing: Potentials, Challenges, and Perspectives

Trichili

Park

Zghal

et al. 2019

IEEE Commun. Surv. Tutorials

189

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Time, polarization, and wavelength multiplexing schemes have been used to satisfy the growing need of transmission capacity. Using space as a new dimension for communication systems has been recently suggested as a versatile technique to address future bandwidth issues. We review the potentials of harnessing the space as an additional degree of freedom for communication applications including free space optics, optical fiber installation, underwater wireless optical links, on-chip interconnects, data center indoor connections, radio frequency and acoustic communications. We focus on the orbital angular momentum (OAM) modes and equally identify the challenges related to each of the applications of spatial modes and the particular OAM modes in communication. We further discuss the perspectives of this emerging technology. Finally, we provide the open research directions and we discuss the practical deployment of OAM communication links for different applications. ). 4 in the future. We also summarize the open problems and the future research directions. A discussion of the practicability and cost of multi-OAM communication is also included. II. OAM POTENTIALS A. Free Space Optical CommunicationFSO is a license free wireless communication configuration that has recently received much interest for a variety of applications. FSO is an attractive solution for last mile connectivity problems, particularly for communication networks, when the installation of fiber optics is costly or not possible [66]. FSO can be also used to establish inter-building secure communication, and can be deployed as a backup to optical fibers. Wireless optical communication can guarantee a line-of-sight (LoS) high bit rate wireless transmission over long distances, up to several kilometers. Furthermore, FSO communication is considered as a promising technique to scale down bandwidth challenges in future 5G networks [67].Multiple wavelength FSO provides better transmission, as demonstrated in [68], [69]. Data can be mapped on advanced modulation formats to achieve high bit rates and high spectral efficiency levels [70]- [72]. Another option is multiple-input and multiple-output (MIMO) FSO communication in which multiple lasers are positioned to transmit Gaussian beams to multiple receiving apertures [73]. Over the last few years, it has been proven that it is possible to transmit information over spatially structured light beams [21], [74], [75] including OAM beams and plane waves. Our focus is on the OAM modes of light.The first PoC communication experiment incorporating OAMs in free space was carried out in 2004 by Gibson and co-workers [21]. Over a 15-meter long link, 8 -spaced values were chosen along the Gaussian beam as an alphabet for the communication. OAM beams were generated and detected using two light modulators. Since then, much progress has been made and free space transmission capacity of over 1 Tbit/s is, today, possible [76]- [78]. By performing three dimensional multiplexing, Huang and co-workers were able to attain a 100 Tbi...

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“…There are two experimental demonstrations for free-space OAM communications systems, one in the 1550 nm optical regime, and the other on 28 GHz RF frequency band. Dr. Qu and Prof. Djordjevic investigate turbulence mitigation methods in free-space optical OAM communications system based on coded modulation [31]. Adaptive optics, channel coding, Huffman coding combined with low-density parity-check (LDPC) coding, and spatial offset are used for turbulence mitigation, achieving a total data transmission capacity of 500 Gbps.…”

Section: Special Issue Papersmentioning

confidence: 99%

Special Issue on Novel Insights into Orbital Angular Momentum Beams: From Fundamentals, Devices to Applications

et al. 2019

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Orbital Angular Momentum Multiplexed Free-Space Optical Communication Systems Based on Coded Modulation

Cited by 14 publications

References 33 publications

Effects of Atmospheric Turbulence on OAM-POL-FDM Hybrid Multiplexing Communication System

Effects of Atmospheric Turbulence on OAM-POL-FDM Hybrid Multiplexing Communication System

Communicating Using Spatial Mode Multiplexing: Potentials, Challenges, and Perspectives

Special Issue on Novel Insights into Orbital Angular Momentum Beams: From Fundamentals, Devices to Applications

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