Optical Fiber Power Control Using Capacitor Load-Curve Feedback
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Solution Overview
Problem
Existing fiber optic power supply systems face efficiency decreases and potential degradation due to optical and electro-optical phenomena, with existing solutions either complicating the system through optical sampling or increasing cost and complexity by using multiple optical fibers and photoelectric converters.
Innovation Solution
A control circuit in the electronic devices connected by an optical fiber adjusts the laser source power based on load curves and resistance values of a capacitive element and a variable resistive component to optimize conversion efficiency without requiring optical sampling or additional filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If optical sampling or filters are used to modulate laser power, then system efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback control system where the control circuit continuously monitors the capacitive element's load curve and compares it against a reference load curve. Based on this comparison, the control circuit automatically adjusts the laser source optical power to maintain optimal photoelectric conversion efficiency, eliminating the need for complex optical sampling or filter-based modulation systems
Solution Approach 2:
The system uses its own operational characteristics (the load curve of the capacitive element) as the basis for control decisions. By monitoring how the capacitive element charges and discharges, the system self-regulates the laser power without requiring external sampling devices or additional control components
2Reliability
If multiple optical fibers and photoelectric converters are used, then system reliability is improved, but device complexity and cost increase
Solution Approach 1:
Instead of adding multiple physical components, the patent achieves improved reliability by dynamically changing the operational parameters of the existing single photoelectric converter. The control circuit adjusts the optical power of the laser source based on the capacitive element's performance, allowing the system to adapt to degradation or varying conditions without requiring redundant 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
This approach enhances system efficiency by adaptively adjusting laser power to match optimal operating conditions, reducing degradation and maintaining performance without increasing complexity or cost.
Implementation Method 1
The first device generally contains a light source, such as a high-power laser, to inject an optical power signal into the optical fiber
Implementation Method 2
an optical power signal injected by the first device into an optical fiber for the second device
Implementation Method 3
The second device also typically contains a photoelectric converter, such as a photodiode, to convert the optical power signal emitted by the first device and transmitted through the optical fiber into electrical energy
Implementation Method 4
The electrical energy produced by the photoelectric converter is stored, for example, in a capacitive element, such as a capacitor, in the second device
Data Source
Figure 1~4
AI summary
This description relates to a system (100) comprising first (101) and second (103) electronic devices connected by an optical fiber (105), in which: - the first device includes a laser source (107) for illuminating the optical fiber; - the second device includes a photoelectric converter (111) for being illuminated from the optical fiber and a capacitive element (115) for storing electrical energy produced by the photoelectric converter; and - the first and second electronic devices include a control circuit connected to the capacitive element and configured to: a) acquire a first load curve of the capacitive element; b) compare the first load curve to a second reference load curve; and c) in case of a difference between the first and second load curves, adapt an optical power of the laser source.