Resonant Beam Communications With Photovoltaic Receiver for Optical Data and Power Transfer

Xiong, Mingliang; Liu, Qingwen; Liu, Mingqing; Wang, Xin; Deng, Hao

doi:10.1109/tcomm.2020.2973962

Cited by 27 publications

(13 citation statements)

References 28 publications

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“…The source power drives the gain medium to provide a power amplification capability. As the transmission loss is compensated by the gain, the beam power can reach a considerable level to support high SNR [13,14].…”

Section: Retroreflectormentioning

confidence: 99%

“…where is the refractive index of the SHG medium, and A ν is the cross section area of the fundamental beam that enters the SHG medium. Supposing the output surface of SHG medium is attached to M3, and neglecting the thickness of the EOM, we obtain A ν = πw 2 (l s ) according to (14). Note that the plane-wave approximation is valid only when the length of SHG medium l s is smaller than the Rayleigh length (z R = πw 2 00 (0)/λ) of the fundamental beam.…”

Section: E Second Harmonic Generationmentioning

confidence: 99%

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Retro-Reflective Beam Communications with Spatially Separated Laser Resonator

Xiong,

Liu,

Jiang

et al. 2021

Preprint

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Optical wireless communications (OWC) which utilizes infrared or visible light as the carrier attracts great attention in 6G research. Resonant beam communications (RBCom) is an OWC technology which simultaneously satisfies the needs of non-mechanical mobility and high signal-to-noise ratio (SNR). It has the self-alignment feature and therefore avoids positioning and pointing operations. However, RBCom undergoes echo interference. In this paper, we propose an echo-interference-free RBCom system design based on second harmonic generation. The transmitter and the receiver constitute a spatially separated laser resonator, in which the retro-reflective resonant beam is formed and tracks the receiver automatically. This structure provides a channel with adaptive capability in beamforming and alignment, which is similar to the concept of intelligent reflecting surface (IRS) enhanced communications, but without hardware and software controllers. Besides, we establish an analytical model to evaluate the beam radius, the beam power, and the channel capacity. The results show that our system achieves longer distance and smaller beam diameter for the transmission beyond 10 Gbit/s, compared with the existing OWC technologies.

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Section: Retroreflectormentioning

confidence: 99%

Section: E Second Harmonic Generationmentioning

confidence: 99%

Retro-Reflective Beam Communications with Spatially Separated Laser Resonator

Xiong,

Liu,

Jiang

et al. 2021

Preprint

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“…Resonant beam charging and communications systems have been proposed to support simultaneously transferring power and information to remote mobile devices [5][6][7]. This technology is based on a spatially separated laser resonator (SSLR).…”

Section: Introductionmentioning

confidence: 99%

Time-Domain Analysis for Resonant Beam Charging and Communications With Delay-Divide Demodulation

Xiong¹,

Si²,

Liu³

et al. 2022

Preprint

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Laser has unique advantages such as abundant spectrum resources and low propagation divergence in wireless charging and wireless communications, compared with radio frequency. Resonant beams, as a kind of intra-cavity laser beams, have been proposed as the carrier of wireless charging and communication, as it has unique features including high power, intrinsic safety, and self-aligned mobility. However, this system has problems such as intra-cavity echo interference and power fluctuation. To study the time-domain behavior of the resonant beam system, we create a simulation algorithm by discretizing the laser rate equations which model the dynamics of the excited atom density in the gain medium and the photon density in the cavity. The simulation results are in good agreement with theoretical calculation. We also propose a delay-divide demodulation method to address the echo interference issue, and use the simulation algorithm to verify its feasibility. The results show that the resonant beam charging and communication system with the proposed demodulator is feasible and performs well. The analysis in this work also helps researchers to deeply understand the behavior of the resonant beam system.

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“…A system has been demonstrated to achieve 2 W power transfer over 2.6 m distance in lab test [16]. An analytical model to depict information transfer in the RB system has been present in [17]. A time-division multiple access (TDMA) method was put forward to support multi-user scenarios [18].…”

Section: Introductionmentioning

confidence: 99%

Long-Range Optical Wireless Information and Power Transfer

Bai¹,

Liu²,

Chen³

et al. 2021

Preprint

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Simultaneous wireless information and power transfer (SWIPT) is a remarkable technology to support data and energy transfer in the era of Internet of Things (IoT). In this paper, we propose a beam-compression resonant beam (BCRB) system for long-range optical wireless information and power transfer based on the telescope-like internal modulator (TIM). Utilizing the TIM, the resonant beam is compressed, making the transmission energy be further concentrated. Thus the over-the-air power loss produced by the beam diverged decreases, which enables the long-range SWIPT capability.We establish the analytical models of the transmission loss, the stability condition, the output power, and the spectral efficiency of the BCRB system, and evaluate the performance on the beam-compression, energy delivery, and data transfer. Numerical analysis illustrates that the exemplary BCRB system can deliver 6 W power and have 14 bit/s/Hz spectral efficiency over 200 m distance. Overall, the BCRB system is a potential scheme for long-range SWIPT in IoT.

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Resonant Beam Communications With Photovoltaic Receiver for Optical Data and Power Transfer

Cited by 27 publications

References 28 publications

Retro-Reflective Beam Communications with Spatially Separated Laser Resonator

Retro-Reflective Beam Communications with Spatially Separated Laser Resonator

Time-Domain Analysis for Resonant Beam Charging and Communications With Delay-Divide Demodulation

Long-Range Optical Wireless Information and Power Transfer

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