Distributed Fiber Optic Sensing Over Switched Optical Networks
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Solution Overview
Problem
Current distributed optical fiber sensing systems are limited in their ability to simultaneously convey high-speed telecommunications data and environmental sensing information over the same optical fiber infrastructure, restricting their application to only telecommunications data transmission.
Innovation Solution
Implementing a distributed fiber optic sensing system that leverages Rayleigh and Raman backscattering to sense physical properties like vibration, temperature, and acoustic effects along the entire optical fiber cable, while utilizing multiple DFOS systems and optical switches to enable sensing over star, ring, mesh, and flexible network topologies, allowing for simultaneous detection of multiple routes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optical fiber is used solely for telecommunications data transmission, then high-speed data communication is achieved, but environmental sensing capability is lost
Solution Approach 1:
The patent segments the optical signal into different wavelength channels: telecommunications signals occupy certain wavelength bands while DFOS interrogation signals use other wavelength bands. This wavelength-division segmentation allows both telecommunications data transmission and environmental sensing to occur simultaneously on the same optical fiber without mutual interference, thereby improving adaptability while maintaining reliability
Solution Approach 2:
The optical fiber infrastructure is transformed into a multi-functional platform that simultaneously performs telecommunications data transmission and distributed environmental sensing. By integrating DFOS interrogation systems with existing telecom networks, the same fiber optic cable serves dual purposes: conveying high-speed data traffic and providing continuous environmental monitoring (temperature, strain, vibration) along its entire length, thus resolving the contradiction between versatility and reliability
2Adaptability or versatility
If multiple DFOS systems are deployed to enable network-wise sensing, then comprehensive environmental monitoring is achieved, but system complexity increases
Solution Approach 1:
The patent merges multiple DFOS interrogation systems and optical switches into a coordinated networked architecture. Instead of operating independently, these systems are integrated through control interfaces that allow centralized or distributed management, enabling network-wise sensing across star, ring, and mesh topologies while reducing operational complexity through unified system management
Solution Approach 2:
The patent introduces intermediary control systems and communication interfaces that coordinate between multiple DFOS systems and optical switches. These intermediaries manage signal routing, synchronize interrogation pulses across different segments, and aggregate sensing data from multiple routes, thereby enabling comprehensive network-wide monitoring while abstracting the underlying complexity from end users
3Productivity
If optical fiber is used for both telecommunications and sensing, then infrastructure utilization is improved, but signal interference may occur
Solution Approach 1:
The patent resolves signal interference by transitioning to another dimension—wavelength frequency. Telecommunications signals and DFOS interrogation signals are assigned to different wavelength bands within the optical spectrum. This dimensional separation in the frequency domain allows both types of signals to coexist on the same physical fiber medium without mutual interference, thereby maximizing infrastructure utilization while eliminating harmful signal interactions
Solution Approach 2:
The patent ensures continuous, uninterrupted operation of both telecommunications and sensing functions simultaneously. By implementing wavelength-division multiplexing and coordinated signal management, the system maintains continuous high-speed data transmission while also providing continuous environmental monitoring along the fiber length, preventing signal degradation or interruption that would otherwise occur from shared medium conflicts
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
Enables the simultaneous transmission of live, high-speed telecommunications signals and distributed fiber optic sensing data, providing comprehensive environmental monitoring and fault detection within existing telecommunications infrastructure, enhancing infrastructure monitoring, intrusion detection, and environmental monitoring capabilities.
Implementation Method 1
an interrogator—generally located within a station—actively generates optical signals, introduces them into an optical fiber, and subsequently detects reflected signals originating along a length of the fiber
Implementation Method 2
Leveraging Rayleigh and Raman backscattering, systems, methods, and structures according to aspects of the present disclosure allow related physical properties—such as vibration, temperature and acoustic effects—to be sensed at every point along the entire optical fiber cable
Implementation Method 3
Leveraging Rayleigh and Raman backscattering, systems, methods, and structures according to aspects of the present disclosure allow related physical properties—such as vibration, temperature and acoustic effects—to be sensed at every point along the entire optical fiber cable
Data Source
AI summary
Aspects of the present disclosure describe optical fiber sensing systems, methods and structures disclosing a distributed optical fiber sensor network constructed on a switched optical fiber telecommunications infrastructure to detect temperatures, acoustic effects, and vehicle traffic—among others—demonstrated with a number of different network topologies.