Self-Powered Optical Amplifiers for Extended Fiber Sensing Reach
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Solution Overview
Problem
Subsea fiber optic sensing systems face challenges with signal fidelity and quality due to long transmission fibers and multiple optical connections, leading to increased complexity, cost, and reduced signal-to-noise ratio (SNR) when extending the reach of fiber optic sensing systems.
Innovation Solution
The implementation of Self-Powered Optical Amplifiers (SPOAs) and enhanced backscatter fibers (EBFs) to increase signal strength, reduce noise floor, and extend the reach of fiber optic sensing systems by maintaining high pulse power and increasing the number of light pulses per second, while using localized power generation nodes to simplify signal amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the reach of fiber optic sensing systems is extended using conventional methods, then the sensing distance is increased, but the signal-to-noise ratio deteriorates and system complexity increases
Solution Approach 1:
The patent divides the long transmission fiber into multiple sections by inserting optical amplifiers at intermediate points. Each amplifier segment boosts the signal locally, preventing the cumulative degradation that would occur over the entire length. This segmentation allows the system to achieve extended sensing distances while maintaining signal-to-noise ratio by resetting the signal quality at each amplifier location.
Solution Approach 2:
Optical amplifiers are introduced as intermediary devices between the interrogator and the distant sensing fiber. These amplifiers act as mediators that actively regenerate and boost the optical signal, compensating for transmission losses without requiring direct connection from the source to the distant sensor, thereby maintaining signal integrity over extended distances.
2Length of stationary object
If the reach of fiber optic sensing systems is extended using conventional methods, then the sensing distance is increased, but device complexity increases
Solution Approach 1:
The patent employs self-powered optical amplifiers that utilize the existing optical signal itself as the pump source for amplification. The amplifiers harvest energy from the transmitted signal to power their own operation, eliminating the need for separate power supply systems, batteries, or external power infrastructure at remote locations. This self-service capability significantly reduces system complexity while enabling extended sensing distances.
Solution Approach 2:
The optical amplifiers are designed to perform multiple functions: signal amplification, power generation from the optical signal, and potential sensing capabilities. This multi-functionality reduces the need for separate dedicated components for each function, thereby simplifying the overall system architecture while achieving extended reach.
3Length of stationary object
If the reach of fiber optic sensing systems is extended using conventional methods, then the sensing distance is increased, but operational costs increase
Solution Approach 1:
The self-powered amplifiers generate their own operating power from the optical signal passing through them, eliminating the need for external power sources, batteries, or power transmission infrastructure at remote locations. This eliminates continuous energy consumption costs and reduces operational expenses associated with power supply maintenance and infrastructure deployment.
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 signal fidelity and quality, allowing for extended reach of fiber optic sensing systems without increasing the burden on existing infrastructure, thereby simplifying the subsea optical distribution system and reducing operational costs.
Implementation Method 1
an optical amplifier operable to amplify the optical signal propagating through the fiber optic cable
Implementation Method 2
a photovoltaic cell electrically coupled to the optical amplifier and operable to convert optical energy to electrical energy
Implementation Method 3
an optical isolator disposed between the pump light source and the fiber optic cable and operable to prevent back-reflected light from entering the pump light source
Implementation Method 4
a circulator optically coupled between the optical amplifier and the interrogator unit
Data Source
AI summary
A self-powered optical amplifier (SPOA) may include a proximal tap connected to a fiber optic cable, a proximal wavelength division multiplexer (WDM) optically connected to the proximal tap, and an Erbium doped fiber optically connecting the proximal WDM to a distal WDM. The SPOA may further includes a distal tap optically connected to the distal WDM, a pump optically connected to the distal WDM, and a controller optically connected to the proximal tap, the distal tap, and further electrically connected to the pump and a power supply.