Wireless optical power transfer system by spatial wavelength division and distributed laser cavity resonance

Lim, Jae-Yeong; Khwaja, Tariq Shamim; Ha, Job

doi:10.1364/oe.27.00a924

Cited by 42 publications

(18 citation statements)

References 28 publications

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“…Besides, Wang et al also conducted experiments on the TCR-based SSLR and demonstrated the adjustable-free range of ±13 • [21]. Lim et al proposed and did experiments on a new SSLR cavity based on spatial wavelength division and diffraction gratings, which realized 1.7-mW received power at 1-m distance [22]. Capacity of the RBCom system based on corner cubes was analyzed in [23].…”

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

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“…ere are several techniques to realize WPT, such as ultrasound, optical, microwave radiation, electric field coupling, and inductive coupling [10][11][12][13][14][15][16][17][18]. Among these methods, inductive coupling is the most preferred for IMDs, where power is transmitted from one coil and received by the other (usually integrated with the IMD inside a human body) through electromagnetic induction.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Coupling Coefficient of the Inductive Link for Wireless Power Transfer to Biomedical Implants

Bao

Xie

et al. 2022

International Journal of Antennas and Propagation

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This work focuses on the optimization of coupling coefficient (k) of the inductive link for the wireless power transfer (WPT) system to be used in implantable medical devices (IMDs) of centimeter size. The analytic expression of k is presented. Simulations are conducted by using the high-frequency structure simulator (HFSS). Analytic results are verified with simulations. The receiving (Rx) coil is implanted in the body and set as a circular coil with a radius of 5 millimeters for reducing the risk of tissue inflammation. The inductive link under misalignment scenarios is optimized to improve k. When the distance between the transmitting (Tx) and Rx coils is fixed at 20 mm, it is found that, to maximize k, the Tx coil in a planar spiral configuration with an average radius of 20 mm is preferred, and the Rx coil in a solenoid configuration with a wire pitch of 0.7 mm is recommended. Based on these optimization results, an inductive link WPT system is proposed; the coupling coefficient k, the power transfer efficiency (PTE), and the maximum power delivered to the load (MPDL) of the system are obtained with both simulation and experiment. Different media of air, muscle, and bone separating the Tx and Rx coils are tested. For the muscle (bone) medium, PTE is 44.14% (43.07%) and MPDL is 145.38 mW (128.13 mW), respectively.

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“…[1][2][3][4][5] The application space for this technology includes sensors in special environments (structural health monitoring of wind turbines, [6] monitoring of high-voltage transmission lines [7][8][9][10] ), wireless powering of medical implants, [11][12][13][14][15] optically isolated power supply for electronic systems, [16][17][18] optical powering of remote antenna units, [2,[19][20][21] optically powered networks, [22,23] Internetof-Things devices, [24] and optical wireless power transfer. [25][26][27][28][29] Several groups have demonstrated PPCs based on III-V compound semiconductor materials with remarkable power conversion efficiencies well above 50%. To maximize performance, the tradeoff between transmission and thermalization losses needs to be balanced.…”

Section: Introductionmentioning

confidence: 99%

68.9% Efficient GaAs‐Based Photonic Power Conversion Enabled by Photon Recycling and Optical Resonance

Helmers

López

Höhn

et al. 2021

Physica Rapid Research Ltrs

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For solar cells operating under the broad‐band solar spectrum, the photovoltaic conversion efficiency is fundamentally limited by transmission and thermalization losses. For monochromatic light, these losses can be minimized by matching the photon energy and the absorber material's bandgap energy. Furthermore, for high‐crystal‐quality direct semiconductors, radiative recombination dominates the minority carrier recombination. Light‐trapping schemes can leverage reabsorption of thereby internally generated photons. Such photon recycling increases the effective excess carrier concentration, which, in turn, increases photovoltage and consequently conversion efficiency. Herein, a back surface reflector underneath a GaAs/AlGaAs rear‐heterojunction structure leverages photon recycling to effectively reduce radiative recombination losses and therefore boost the photovoltage. At the same time, resonance in the created optical cavity is tailored to enhance near‐bandgap absorption and, thus, minimize thermalization loss. With a thin film process and a combined dielectric–metal reflector, an unprecedented photovoltaic conversion efficiency of 68.9 ± 2.8% under 858 nm monochromatic light at an irradiance of 11.4 W cm−2 is demonstrated.

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Wireless optical power transfer system by spatial wavelength division and distributed laser cavity resonance

Cited by 42 publications

References 28 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

Optimization of the Coupling Coefficient of the Inductive Link for Wireless Power Transfer to Biomedical Implants

68.9% Efficient GaAs‐Based Photonic Power Conversion Enabled by Photon Recycling and Optical Resonance

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