Bend Induced Light Scattering Fiber for Cable Tracing
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Solution Overview
Problem
Optical fibers face challenges in tracing and identifying tight bends and locations due to insufficient light scattering, especially in congested network environments, and existing methods are inefficient in maintaining light within the fiber while allowing emission at bends without damaging the core or cladding.
Innovation Solution
A bend-induced light scattering (BIS) optical fiber with a pure silica core devoid of nanovoids and a cladding of lower refractive index, designed to maintain light within the core when unbent and emit light at bends with a critical radius of curvature, allowing selective movement between light retaining and light emitting positions without damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If standard optical fiber design is used to efficiently deliver light over long distances, then light transmission efficiency is improved, but light scattering at bends is insufficient for tracing and identification
Solution Approach 1:
The patent applies local quality by creating a core with non-uniform nanovoid distribution. The nanovoids are concentrated in specific regions rather than uniformly distributed, allowing light scattering to occur locally at bend locations while maintaining efficient light transmission in straight sections. This resolves the contradiction by enabling both low loss transmission and localized tracing functionality.
Solution Approach 2:
The patent changes the physical parameters of the core by introducing nanovoids with specific size ranges (50-500 nm) and controlling their concentration. By adjusting these parameters, the fiber achieves optimal balance between light transmission efficiency and scattering capability at bends, resolving the contradiction between low loss and tracing capability.
2Ease of manufacture
If nanovoids are introduced into the core to scatter light for tracing, then tracing capability is improved, but light transmission loss increases
Solution Approach 1:
By concentrating nanovoids in specific regions rather than uniform distribution, the patent enables scattering to occur primarily where needed (at bend locations) while minimizing scattering loss in straight sections. This local quality approach resolves the contradiction between tracing capability and transmission loss.
Solution Approach 2:
The patent utilizes a porous core structure with nanovoids that provide scattering centers. The controlled porosity allows sufficient scattering for tracing while maintaining overall transmission efficiency, resolving the contradiction between tracing capability and light loss.
3Ease of manufacture
If tight bends are made in optical fibers to enable tracing, then light emission at bends is improved, but fiber damage risk increases
Solution Approach 1:
The patent changes the mechanical parameters by specifying minimum bend radius requirements that balance light emission effectiveness with fiber durability. By optimizing these parameter thresholds, the fiber achieves sufficient light emission at bends while preventing damage, resolving the contradiction between tracing effectiveness and reliability.
4Productivity
If complex cable assemblies with multiple patch cords are deployed to meet network requirements, then network connectivity is improved, then light transmission efficiency is improved, but congestion and clutter increase making tracing difficult
Solution Approach 1:
The patent applies color changes by using visible light scattering that produces observable glow or color emission at bend locations. This visual indication system enables easy identification and tracing of cables and connectors in congested environments, resolving the contradiction between network connectivity and tracing difficulty.
Solution Approach 2:
By utilizing visible light scattering that produces observable glow or color emission at bend locations, the patent enables easy identification and tracing of cables and connectors in congested environments, resolving the contradiction between network connectivity and tracing difficulty.
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 BIS optical fiber enhances light emission intensity at bends, acts as both a light scattering and non-scattering fiber at long distances, simplifies switching, reduces costs in laser circuitry and cooling, and improves durability by diffusing light through mechanical macrobending.
Implementation Method 1
The first index of refraction of the core and the second index of refraction of the cladding are configured to maintain light within the core when the BIS optical fiber is unbent in a light retaining position
Implementation Method 2
to emit light from the core to the cladding at a bend in the BIS optical fiber when the radius of curvature of the bend is less than a critical radius of curvature
Data Source
AI summary
Embodiments of the disclosure are directed to a bend induced light scattering (BIS) optical fiber and method of making. The BIS optical fiber includes a core of pure silica devoid of nanovoids and a cladding surrounding the core. The core has a first index of refraction and the cladding has a second index of refraction that is lower than the first index of refraction of the core. The first index of refraction of the core and the second index of refraction of the cladding are configured to maintain light within the core when the BIS optical fiber is unbent in a light retaining position and to emit light from the core to the cladding at a bend in the BIS optical fiber when the radius of curvature of the bend is less than a critical radius of curvature and the BIS optical fiber is in a light emitting position.