Rollable Optical Fiber Ribbon With Laser-Sintered Chevron Coupling
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Solution Overview
Problem
Conventional optical fiber ribbons lack flexibility due to their continuous UV-cured acrylate coating, which restricts bending and handling, especially in smaller cable constructions with four or more fibers, necessitating either rotation of the entire cable or ribbon within the construction.
Innovation Solution
A rollable optical fiber ribbon is created using a secondary thermoplastic material intermittently bonding optical fibers or groups via laser sintering, forming non-continuous polymer coupling features in a chevron pattern, allowing for reversible movement and improved flexibility by transitioning between flat and semi-round configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a continuous UV-cured acrylate coating is used to join optical fibers along the length of the ribbon, then fiber organization and structural stability are improved, but cable flexibility and bending capability deteriorate
Solution Approach 1:
The continuous acrylate coating is segmented into discrete, intermittent bonding zones along the length of the ribbon. This segmentation allows the fiber array to flex and bend between the bonding zones while maintaining structural integrity at the bonding locations, thus resolving the contradiction between stability and flexibility.
Solution Approach 2:
The bonding structure transitions from a static, continuous coating to a dynamic, intermittent pattern that allows relative lateral and axial movement of fiber groups. This dynamic configuration enables the ribbon to adapt to bending requirements while maintaining organizational structure where needed.
2Strength
If a continuous UV-cured acrylate coating is used to join optical fibers, then structural integrity is improved, but material usage and manufacturing complexity increase
Solution Approach 1:
The bonding process is segmented into discrete zones rather than requiring continuous coating application. This reduces the amount of material needed and simplifies the manufacturing process by allowing intermittent bonding at specific locations along the ribbon length.
Solution Approach 2:
Instead of applying coating material along the entire length of the ribbon, the process applies material only at partial, strategically located zones. This partial action reduces material consumption and manufacturing complexity while maintaining sufficient structural integrity for the application.
3Adaptability or versatility
If discrete laser-sintered polymer coupling features are used instead of continuous coating, then flexibility and material usage are improved, but manufacturing precision requirements increase
Solution Approach 1:
The mechanical UV-curing process is replaced with laser-sintering technology. The laser provides precise, localized heating that melts and bonds the thermoplastic powder at specific zones, achieving the required bonding precision through thermal control rather than mechanical coating application.
Solution Approach 2:
The bonding process changes from UV-curing (photopolymerization) to laser-sintering (thermal melting). This parameter change allows for precise control of bonding characteristics through temperature and time parameters, achieving the necessary precision for discrete coupling features.
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 solution enhances the flexibility of optical fiber ribbons, reduces cable size, and minimizes stress on fibers, enabling easier handling and installation while maintaining organizational benefits of continuous ribbons, with lower material usage and manufacturing efficiencies compared to conventional methods.
Implementation Method 1
a laser beam is focused onto the moving fiber array such that the laser beam melts the polymer powder to form a polymer coupling element that bonds to the fiber array
Implementation Method 2
The raw secondary material may be in the form of a thermoplastic powder or a thermoplastic or whereby the material will be deposited and then melted/sintered using laser radiation
Data Source
AI summary
A rollable optical fiber ribbon includes a plurality of optical transmission elements, wherein each optical transmission element includes an optical core surrounded by a cladding of a different refractive index than the optical core, the cladding surrounded by a fiber coating layer, the fiber coating layer having an inner surface contacting the cladding and an outer surface defining an exterior surface of the optical transmission elements; and a coupling element coupled to and supporting the plurality of optical transmission elements in an array. The coupling element forms a chevron pattern and is formed from a flexible polymeric material such that the plurality of optical transmission elements are reversibly movable from an unrolled position in which the plurality of optical transmission elements are substantially aligned with each other to a rolled position.