Power-Over-Fiber Feed Light Compensation for Distance Attenuation
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Solution Overview
Problem
Current optical power supply systems require improvements in photoelectric conversion efficiency on both the power-sourcing and powered sides to enhance overall efficiency.
Innovation Solution
A power-over-fiber system incorporating a semiconductor laser for power supply, a photoelectric conversion element, an optical fiber cable, a measurer to assess transmission distance, and a control device to compensate for light attenuation, utilizing specific semiconductor materials with short or long wavelengths based on efficiency priorities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If optical power supply is implemented without distance-based compensation, then system simplicity is maintained, but photoelectric conversion efficiency deteriorates due to uncorrected light attenuation
Solution Approach 1:
The system performs preliminary distance measurement using OTDR before power transmission, and pre-calculates the required compensation amount. This allows the feed light output to be adjusted in advance according to the measured distance, ensuring optimal photoelectric conversion efficiency from the start without requiring real-time feedback during power transmission.
Solution Approach 2:
The system implements feedback by measuring the transmission distance using OTDR, calculating the appropriate compensation amount based on the measured distance, and adjusting the feed light output accordingly. This closed-loop approach ensures that the power sourcing equipment adapts to different transmission distances to maintain optimal efficiency.
2Productivity
If fixed feed light output is used regardless of distance, then device complexity is reduced, but optical power supply efficiency deteriorates due to attenuation variations
Solution Approach 1:
The system changes the output parameter of feed light based on the transmission distance. By measuring the distance with OTDR and calculating the appropriate compensation, the system adjusts the feed light output intensity to match the actual transmission requirements, thereby optimizing optical power supply efficiency across different distances.
3Loss of energy
If distance measurement and compensation control are implemented, then photoelectric conversion efficiency is improved, but device complexity increases
Solution Approach 1:
The system uses OTDR as an intermediary to measure the transmission distance indirectly by analyzing reflected light characteristics. This non-intrusive measurement method allows distance acquisition without requiring direct physical access to the far end of the optical fiber, simplifying the overall system architecture while enabling accurate compensation control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system improves photoelectric conversion efficiency and optical power supply efficiency by optimizing semiconductor materials and compensating for light attenuation, ensuring effective power transmission.
Implementation Method 1
a power sourcing equipment including a semiconductor laser that oscillates with electric power to output feed light
Implementation Method 2
a powered device including a photoelectric conversion element that converts the feed light into electric power
Implementation Method 3
an optical fiber cable that transmits the feed light from the power sourcing equipment to the powered device
Data Source
AI summary
To improve the optical power supply efficiency, a power-over-fiber system includes a power sourcing equipment including a semiconductor laser that oscillates with electric power to output feed light, a powered device including a photoelectric conversion element that converts the feed light into electric power, a plurality of optical fiber cables that transmit the feed light, a measurer that measures a distance from the power sourcing equipment to the powered device, and a control device that controls the power sourcing equipment to output the feed light after compensating for an amount of attenuation of the feed light according to a transmission distance on the basis of the distance from the power sourcing equipment to the powered device measured by the measurer.