Perspectives on advances in high-capacity, free-space communications using multiplexing of orbital-angular-momentum beams

Willner, Alan E.; Zhao, Zhe; Liu, Cong; Zhang, Runzhou; Song, Haoqian; Pang, Kai; Manukyan, Karapet; Song, Hao; Su, Xinzhou; Xie, Guodong; Ren, Yongxiong; Yan, Yan; Tur, Moshe; Molisch, Andreas F.; Boyd, Robert W.; Zhou, Huibin; Hu, Nanzhe; Minoofar, Amir; Huang, Hao

doi:10.1063/5.0031230

Cited by 76 publications

(37 citation statements)

References 122 publications

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“…The M-DPPM-M-PAPM combination produces less PP than the OOK. The M-DPPM-M-PAPM improvement in the PP is improved as the CL number increases from M = 1 to 2 and the ICC sources [5,8,9,[46][47][48][49][50][51][52][53][54][55][56]. The proposed M-ary DPPM-M-PAPM approach increases receiver sensitivity in the WDM-M-HFFSO systems compared with OOK-NRZ and improves reliability and produces a lower PP of 0.2-3.0 dB PP for WT.…”

Section: Resultsmentioning

confidence: 93%

“…Compared to the hybrid OOK/M-ary DPPM, the M-n-PAPM requires 0.3 dB more power. The results demonstrate that the proposed hybrid OOK/M-DPPM and M-n-PAPM models for the WDM-FSO systems can be improved [54][55][56][57][58][59][60]. Table 2 summarizes the proposed modulation schemes of MPPM, M-ary-PAPM, and hybrid M-ary PAPM-MPPM with hybrid k-level n-pulse where k n (with k ∈ {1, 2, …}) [2,8,9,17,42,50].…”

Section: Resultsmentioning

confidence: 98%

“…M-ary PAPM-DPPM modulation provides about 10-11 dB increases in OOK-NRZ sensitivity for the WDM-FSO optical fiber network system in the absence of turbulence on the target BER with all AA as seen in Figure 10 [ [48][49][50][51][52][53][54][55][56][57][58]. When the turbulence and ASE noise is present, the OS is reduced to 10 dB (WT), 8 dB (MT), and 8 dB (ST) [present] in the sensitivity increase of PAPM DPPM over OOK NRZ [56][57][58][59][60][61][62].…”

Section: Resultsmentioning

confidence: 99%

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Performance Enhancement of DWDM-FSO Optical Fiber Communication Systems Based on Hybrid Modulation Techniques under Atmospheric Turbulence Channel

2021

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In this paper, we enhance the performance efficiency of the free-space optical (FSO) communication link using the hybrid on-off keying (OOK) modulation, M-ary digital pulse position modulation (M-ary DPPM), and M-pulse amplitude and position modulation (M-PAPM). This work analyzes and enhances the bit error rate (BER) performance of the moment generating function, modified Chernoff bound, and Gaussian approximation techniques. In the existence of both an amplified spontaneous emission (ASE) noise, atmospheric turbulence (AT) channels, and interchannel crosstalk (ICC), we propose a system model of the passive optical network (PON) wavelength division multiplexing (WDM) technique for a dense WDM (DWDM) based on the hybrid fiber FSO (HFFSO) link. We use eight wavelength channels that have been transmitted at a data rate of 2.5 Gbps over a turbulent HFFSO-DWDM system and PON-FSO optical fiber start from 1550 nm channel spacing in the C-band of 100 GHz. The results demonstrate (2.5 Gbps × 8 channels) 20 Gbit/s-4000 m transmission with favorable performance. In this design, M-ary DPPM-M-PAPM modulation is used to provide extra information bits to increase performance. We also propose to incorporate adaptive optics to mitigate the AT effect and improve the modulation efficiency. We investigate the impact of the turbulence effect on the proposed system performance based on OOK-M ary- PAPM-DPPM modulation as a function of M-ary DPPM-PAPM and other atmospheric parameters. The proposed M-ary hybrid DPPM-M-PAPM solution increases the receiver sensitivity compared to OOK, improves the reliability and achieves a lower power penalty of 0.2–3.0 dB at low coding level (M) 2 in the WDM-FSO systems for the weak turbulence. The OOK/M-ary hybrid DPPM-M-PAPM provides an optical signal-to-noise ratio of about 4–8 dB of the DWDM-HFFSO link for the strong turbulence at a target BER of 10−12. The numerical results indicate that the proposed design can be enhanced with the hybrid OOK/M-DPPM and M-PAPM for DWDM-HFFSO systems. The calculation results show that PAPM-DPPM has increased about 10–11 dB at BER of 10−12 more than the OOK-NRZ approach. The simulation results show that the proposed hybrid optical modulation technique can be used in the DWDM-FSO hybrid links for optical-wireless and fiber-optic communication systems, significantly increasing their efficiency. Finally, the use of the hybrid OOK/M-ary DPPM-M-PAPM modulation schemes is a new technique to reduce the AT, ICC, ASE noise for the DWDM-FSO optical fiber communication systems.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

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Performance Enhancement of DWDM-FSO Optical Fiber Communication Systems Based on Hybrid Modulation Techniques under Atmospheric Turbulence Channel

2021

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“…As each OAM beam carrying an independent data stream co-propagates with other OAM beams, the spectral efficiency of the system (i.e., bits/s/Hz) scales with the number of OAM beams utilized for multiplexing. OAM beams can be carried on orthogonal polarizations and polarization division multiplexing (PDM) can also be applied to further double the spectral efficiency of the system [10].…”

Section: A Basic Concept and Features Of Oammentioning

confidence: 99%

Reconfigurable Intelligent Surface Based Orbital Angular Momentum: Architecture, Opportunities, and Challenges

Yang

Zhang

et al. 2021

IEEE Wireless Commun.

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Orbital angular momentum (OAM) has gained a lot attention due to its potential in enhancing spectral efficiency for wireless communications. Using different OAM modes, multiple independent data are simultaneously transmitted. OAM can bring a new multiple access for wireless communications. In this article, a reconfigurable intelligent surface (RIS) based OAM framework is introduced. The basic concepts and features of RIS and OAM are presented. Then, the classifications and comparisons of different RIS based OAM schemes are summarized. Furthermore, the RIS based OAM for wireless communications is discussed in details. Simulation results verify that the RIS based OMA transmission can significantly increase the spectral efficiency of wireless communication systems.

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“…SDM technology is based on the use of a degree of freedom determined by the transverse distribution of the electromagnetic (EM) field, that corresponds to multiplexing of spatially separated optical fields in multicore fibers (MCF) or using several linear polarized (LP) modes in few-mode fibers (FMF) [ 18 ]. SDM concept can be applied in both fiber-optic [ 17 , 18 , 19 , 20 ] and atmospheric [ 21 , 22 , 23 ] optical communication lines.…”

Section: Introductionmentioning

confidence: 99%

Wavelength-Tunable Vortex Beam Emitter Based on Silicon Micro-Ring with PN Depletion Diode

Stepanov

Fatkhiev

Lyubopytov

et al. 2022

Sensors

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Herein we propose a design of a wavelength-tunable integrated vortex beam emitter based on the silicon-on-insulator platform. The emitter is implemented using a PN-depletion diode inside a microring resonator with the emitting hole grating that was used to produce a vortex beam. The resonance wavelengths can be shifted due to the refractive index change associated with the free plasma dispersion effect. Obtained numerical modeling results confirm the efficiency of the proposed approach, providing a resonance wavelength shift while maintaining the required topological charge of the emitted vortex beam. It is known that optical vortices got a lot of attention due to extensive telecommunication and biochemical applications, but also, they have revealed some beneficial use cases in sensors. Flexibility in spectral tuning demonstrated by the proposed device can significantly improve the accuracy of sensors based on fiber Bragg gratings. Moreover, we demonstrate that the proposed device can provide a displacement of the resonance by the value of the free spectral range of the ring resonator, which means the possibility to implement an ultra-fast orbital angular momentum (de)multiplexing or modulation.

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Perspectives on advances in high-capacity, free-space communications using multiplexing of orbital-angular-momentum beams

Cited by 76 publications

References 122 publications

Performance Enhancement of DWDM-FSO Optical Fiber Communication Systems Based on Hybrid Modulation Techniques under Atmospheric Turbulence Channel

Performance Enhancement of DWDM-FSO Optical Fiber Communication Systems Based on Hybrid Modulation Techniques under Atmospheric Turbulence Channel

Reconfigurable Intelligent Surface Based Orbital Angular Momentum: Architecture, Opportunities, and Challenges

Wavelength-Tunable Vortex Beam Emitter Based on Silicon Micro-Ring with PN Depletion Diode

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