Mobile Optical Communications Using Second Harmonic of Intra-Cavity Laser

Xiong, Mingliang; Liu, Qingwen; Wang, Xin; Zhou, Shengli; Zhou, Bin; Bu, Zhiyong

doi:10.48550/arxiv.2106.11116

Cited by 2 publications

(3 citation statements)

References 32 publications

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“…Capacity of the RBCom system based on corner cubes was analyzed in [23]. To overcome the intra-cavity echo interference, an intra-cavity second harmonic generation (SHG) scheme was adopted in the RBCom system [24]. Mobile optical SWIPT based on symmetric SSLR and intra-cavity SHG was proposed in [25].…”

Section: Information Powermentioning

confidence: 99%

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Optimization of A Mobile Optical SWIPT System With Asymmetric Spatially Separated Laser Resonator

Xiong,

Liu,

Zhou

2021

Preprint

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High-power and high-capacity simultaneous wireless information and power transfer (SWIPT) becomes more and more important with the development of Internet of Things technologies. Optical SWIPT, also known as simultaneous light information and power transfer (SLIPT), has unique advantages such as abundant spectrum resources and low propagation divergence, compared with RF technologies. However, optical SWIPT faces many challenges in beam steering and receiver positioning/tracking. Resonant beams generated by spatially separated laser resonators (SSLR) have many advantages, including high power, self-aligned mobility, and intrinsic safety. It has been proposed as the carrier of wireless charging and communication. Using resonant beams, mobile electronic devices can be remotely charged and supported with high-rate data transfer. In this paper, we propose a mobile optical SWIPT system based on asymmetric SSLR and present the system optimization procedure. We also determine the boundary of the achievable charging power and communication capacity, and discuss the trade-off between power transfer and information transfer. Numerical results show that the charging power of the optimized asymmetric system is much higher than that of the symmetric system in the previous work, and meanwhile, the channel capacity is kept almost unchanged.

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Section: Information Powermentioning

confidence: 99%

“…From (22)(23)(24), we observe that the threshold power P th is proportional to a g . Consequently, to balance the intra-cavity diffraction loss and the threshold power, we should find a proper a g .…”

Section: B Gain Medium Aperture and Shg Medium Thicknessmentioning

confidence: 99%

Optimization of A Mobile Optical SWIPT System With Asymmetric Spatially Separated Laser Resonator

Xiong,

Liu,

Zhou

2021

Preprint

Self Cite

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show abstract

“…These issues affect the efficiency of battery charging and the feasibility of high-capacity communication. A design based on intra-cavity second harmonic generation (SHG) was proposed to avoid the echo interference in the resonant beam communication system [25], while the SHG beam lies in the visible spectrum, which may not be accepted in daily life. Experimentally observing the fast fluctuation of the resonant beam power using an oscilloscope is very expensive, as the frequency band of the echo is much wider than that of the source signal.…”

Section: Introductionmentioning

confidence: 99%

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

Xiong¹,

Si²,

Liu³

et al. 2022

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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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Mobile Optical Communications Using Second Harmonic of Intra-Cavity Laser

Cited by 2 publications

References 32 publications

Optimization of A Mobile Optical SWIPT System With Asymmetric Spatially Separated Laser Resonator

Optimization of A Mobile Optical SWIPT System With Asymmetric Spatially Separated Laser Resonator

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

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