Power-over-Fiber Feed Light Control for Stable Receiver Power
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Solution Overview
Problem
In power over fiber systems, maintaining efficient electric power supply without excess or deficiency is challenging due to varying electric power consumption at the optical receiver, leading to potential heat loss or power shortages.
Innovation Solution
A power over fiber system that includes a semiconductor laser for generating feed light, a photoelectric conversion element for converting light to electric power, an optical fiber for transmission, and controllers to adjust the output level of the feed light based on stored electric power levels, ensuring neither excess nor deficiency in power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feed light is supplied at constant output to optical receiver, then power supply stability is improved, but energy efficiency deteriorates due to excess power loss as heat when load consumption decreases
Solution Approach 1:
The patent implements a feedback mechanism where the optical receiver measures the stored electric power amount in the power storage device and communicates this information back to the optical transmitter. The optical transmitter then adjusts the feed light output level based on this feedback, reducing output when power storage is sufficient and increasing it when storage is low, thereby preventing energy waste while maintaining reliable power supply.
Solution Approach 2:
The patent transitions from a static constant output power supply mode to a dynamic adjustable output mode. The optical transmitter dynamically changes the feed light output level according to the real-time power storage status at the receiver end, optimizing energy efficiency while ensuring power supply reliability through adaptive control.
2Loss of energy
If feed light output is reduced to prevent heat loss, then energy efficiency is improved, but power supply reliability deteriorates due to potential power shortage when load consumption increases
Solution Approach 1:
The feedback mechanism enables the optical transmitter to receive real-time information about power storage levels and adjust the feed light output accordingly. When the power storage amount drops below a threshold, the transmitter increases output to prevent power shortage, thereby maintaining power supply reliability while optimizing energy efficiency through condition-based adjustment.
Solution Approach 2:
The optical receiver autonomously monitors its own power storage status and actively requests appropriate power levels by communicating storage information back to the transmitter. This self-service approach enables the system to automatically balance energy efficiency and power supply reliability without external intervention.
3Device complexity
If constant feed light output is maintained, then device complexity is reduced, but adaptability deteriorates due to inability to respond to varying load power consumption
Solution Approach 1:
The patent introduces a feedback-based adaptive control mechanism where the optical transmitter adjusts feed light output based on power storage information from the receiver. This adds adaptability to respond to varying load conditions while keeping the control logic relatively simple through threshold-based adjustment, effectively balancing device complexity and power supply adaptability.
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
This system efficiently manages electric power supply by adjusting the output level of the feed light according to stored power levels, preventing heat loss and power shortages, thus maintaining optimal power delivery to the optical receiver.
Implementation Method 1
an optical transmitter that transmits signal light modulated with an electric signal and feed light for supplying electric power
Implementation Method 2
an optical fiber including a core that transmits the signal light, a first cladding that is formed around the core, has a refractive index lower than that of the core, and transmits the feed light
Implementation Method 3
a powered device including a photoelectric conversion element that converts the feed light output by the power sourcing equipment into electric power
Data Source
AI summary
A power over fiber system includes a power sourcing equipment, a powered device, an optical fiber cable, a power storage and a controller. The power sourcing equipment includes a semiconductor laser that oscillates with electric power, thereby outputting feed light. The powered device includes a photoelectric conversion element that converts the feed light into electric power. The optical fiber cable transmits the feed light from the power sourcing equipment to the powered device. The power storage stores the electric power. The controller performs a process of lowering an output level of the feed light in response to a value related to an electric power amount of the electric power stored in the power storage being equal to or higher than a predetermined threshold value, and performs a process of raising the output level in response to the value being lower than the predetermined threshold value.