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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
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Reconfigurable MIMO-based self-powered battery-less light communication system.

Jose Ilton De Oliveira Filho1,2, Abderrahmen Trichili3, Omar Alkhazragi3

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Summary
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This study introduces a novel system for simultaneous lightwave information and power transfer (SLIPT) for Internet of Things (IoT) devices. The system efficiently harvests energy and transmits data, enabling self-powered autonomous operation in remote environments.

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Area of Science:

  • Optical Wireless Communication
  • Energy Harvesting
  • Internet of Things (IoT)

Background:

  • Optical wireless communication faces challenges in maintaining stable connections and power for remote devices.
  • Simultaneous Lightwave Information and Power Transfer (SLIPT) offers a solution for continuous charging and data connectivity.
  • Omnidirectional receivers are crucial for improving power budget and connection stability in SLIPT systems.

Purpose of the Study:

  • To design and demonstrate a multiplexed SLIPT system using a photodetector array for enhanced information decoding and energy harvesting.
  • To investigate the system's capability for beam tracking and spatial diversity through quadrant-based photodetector operation.
  • To explore different configurations for optimizing data rates and power harvesting efficiency.

Main Methods:

  • A 3x3 array of photodetectors (PDs) was designed for simultaneous information decoding and energy harvesting.
  • PDs were configured to switch between photoconductive and photovoltaic modes for flexible operation.
  • The system was tested in smaller (high data rate) and larger (high power) versions, with quadrant-specific testing for beam tracking.

Main Results:

  • A self-powering device achieved a 25.7 Mbps gross data rate (SISO) and 85.2 Mbps net data rate (MIMO).
  • The system harvested up to 87.33 mW of power under standard illumination, exceeding operational needs.
  • Demonstrated ability to decode information and harvest energy from specific PD quadrants for beam tracking.

Conclusions:

  • The developed SLIPT system effectively enables simultaneous data transfer and energy harvesting for IoT devices.
  • The system's design supports autonomous operation of IoT devices in challenging environments and potential space applications.
  • This research advances the potential for self-sustaining, connected devices in remote and demanding settings.