Power Over Fiber System Phase Modulation
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Solution Overview
Problem
Conventional optical power supply systems primarily use feed light as an energy transmission medium without effectively utilizing it for information communication, leading to inefficiencies in both energy and data transmission.
Innovation Solution
A power over fiber system that includes a power sourcing equipment with a laser oscillator and modulator to phase-modulate feed light for transmission information, and a powered device with a photoelectric conversion element and demodulator to convert feed light into electric power and restore transmission information, utilizing semiconductor materials with short wavelengths for high photoelectric conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If feed light is used only as an energy transmission medium without modulation, then the system structure is simple, but information communication capability is lost
Solution Approach 1:
The feed light is designed to serve dual functions: energy transmission and information communication. By phase-modulating the feed light with transmission information before transmission, the same optical carrier simultaneously delivers both power and data, eliminating the need for separate communication channels and reducing overall system complexity despite adding modulation capability.
Solution Approach 2:
The patent merges the power transmission function and information communication function into a single feed light transmission channel. The modulator combines the energy carrier (feed light) with information signals, creating a unified transmission medium that carries both functions through the same optical fiber infrastructure.
2Use of energy by moving object
If conventional optical power supply is used without phase modulation, then energy transmission is achieved, but photoelectric conversion efficiency is insufficient
Solution Approach 1:
The patent employs phase modulation to change the temporal and spatial parameters of the feed light. By modulating the phase of the optical carrier according to transmission information, the system optimizes the light characteristics for both efficient transmission and enhanced photoelectric conversion at the receiving end, improving energy utilization without fundamental changes to the conversion mechanism.
3Ease of manufacture
If signal light and feed light share the same optical fiber, then component costs are reduced, but transmission interference occurs
Solution Approach 1:
The patent segments the optical fiber transmission into distinct functional zones: the core transmits signal light for communication, while the cladding transmits feed light for power delivery. This spatial segmentation within the fiber structure allows both signal and power transmission without interference, maintaining reliability while using a single integrated fiber component.
Solution Approach 2:
The optical fiber cladding acts as an intermediary transmission channel for feed light, separating it from the core where signal light travels. This intermediary structure enables independent transmission paths for power and data within the same fiber, preventing cross-interference while reducing the need for separate fiber cables and associated connection components.
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 achieves improved optical power supply efficiency and enables bidirectional communication of information using feed light, enhancing energy transmission efficiency and reducing component costs by separating signal and feed light paths within the optical fiber.
Implementation Method 1
a laser oscillator that converts electric power into feed light
Implementation Method 2
a photoelectric conversion element that converts feed light input from outside of the powered device into electric power
Data Source
AI summary
A power sourcing equipment includes a laser oscillator and a modulator. The laser oscillator converts electric power into feed light. The modulator modulates, based on transmission information, a phase of the feed light output from the laser oscillator. The feed light phase-modulated by the modulator is output to outside of the power sourcing equipment. A powered device includes a photoelectric conversion element and a demodulator. The photoelectric conversion element converts feed light input from outside of the powered device into electric power. The demodulator detects a phase of the feed light to restore transmission information.