Hybrid Telecommunication Cable Segmented Sensing Core
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Solution Overview
Problem
Existing submarine telecommunications cables face challenges in monitoring mechanical deformations without compromising the security and bandwidth of telecommunication data, as current sensing techniques like DAS and FMI reduce cable bandwidth, making them unsuitable for scientific research and seismic monitoring.
Innovation Solution
A hybrid telecommunications cable design featuring a core of optical fibers for data transmission, internal steel wire reinforcement, a polymer protective sheath, and at least one sensing optical fiber between the core and protective sheath, allowing for separate monitoring of mechanical deformations using techniques like BOTDR and DAS/FMI without affecting data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing optical fibres are used for DAS or FMI monitoring, then mechanical deformation monitoring capability is improved, but cable bandwidth is reduced
Solution Approach 1:
The cable is segmented into distinct functional zones: a core containing telecommunication optical fibres, and a separate sensing zone with dedicated sensing optical fibres positioned between the core and protective sheath. This spatial segmentation allows independent operation of telecommunication and sensing functions without mutual interference, resolving the bandwidth reduction problem while maintaining monitoring capability.
Solution Approach 2:
The sensing function is extracted from the telecommunication core and implemented through separate sensing optical fibres positioned in the intermediate layer. This extraction allows the telecommunication fibres to operate at full bandwidth capacity while the sensing fibres independently perform mechanical deformation monitoring through DAS or FMI techniques.
2Reliability
If sensing optical fibres are integrated in the cable, then monitoring capability is improved, but cable structure complexity increases
Solution Approach 1:
The cable structure merges telecommunication and sensing functions into a single integrated cable assembly. The sensing optical fibres are positioned in the intermediate layer between the core and protective sheath, sharing the same cable infrastructure without requiring separate monitoring systems, thus improving reliability while controlling complexity through unified design.
Solution Approach 2:
The cable structure is designed with multi-functionality: the same cable assembly simultaneously provides telecommunication data transmission through the core and mechanical deformation monitoring through the sensing fibres in the intermediate layer. This universal design eliminates the need for separate monitoring cables, reducing overall system complexity while enhancing monitoring capability.
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 secure, uninterrupted telecommunication data transmission while allowing for comprehensive monitoring of mechanical integrity and environmental changes, including seismic activity and cable health, through the use of redundant sensing fibers and adapted measurement techniques.
Implementation Method 1
As a measurement light pulse propagates through an optical fibre, light backscattered at scattering sites can be used to detect deformations, movements or vibrations of the fibre
Implementation Method 2
As a measurement light pulse propagates through an optical fibre
Data Source
AI summary
A telecommunication cable including a core with a plurality of optical fibres, an inner reinforcement radially arranged around the core, the inner reinforcement having a plurality of steel wires, an intermediate sheath arranged radially between the core and the inner reinforcement, and a protective sheath made of polymer material arranged radially around the inner reinforcement. The cable further includes at least one optical fibre sensor arranged between the core and the protective sheath.