Optical Fiber Dual-Layer Resin Coating Low-Temperature Loss
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Solution Overview
Problem
Optical fiber cables with smaller diameters and more fibers experience increased transmission loss at low temperatures due to lateral pressure, necessitating improved low-temperature properties.
Innovation Solution
An optical fiber design featuring a glass fiber coated with a dual-layer resin system, where the primary resin layer is formed from a cured composition of an oligomer, monomer, and photopolymerization initiator, with a polyol compound having a low proportion of primary hydroxyl groups, and the secondary resin layer has a Young's modulus of 1780 MPa or more at -40°C, reducing transmission loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the diameter of optical fiber cable is reduced and more fibers are packed, then cable compactness and fiber density are improved, but low-temperature properties deteriorate due to increased transmission loss from lateral pressure
Solution Approach 1:
The coating resin layer is divided into two distinct layers: a primary resin layer in direct contact with the glass fiber and a secondary resin layer on the outer surface. Each layer has different material compositions and properties, with the primary layer providing cushioning and the secondary layer providing structural support and low-temperature resistance.
Solution Approach 2:
Different regions of the coating resin layer are assigned different material properties. The primary resin layer uses a polyol compound with controlled primary hydroxyl group content (3.5% or less) to provide local cushioning, while the secondary resin layer has a specific Young's modulus (1780 MPa or more at -40°C) to provide local structural support against lateral pressure.
2Stability of the object's composition
If lateral pressure is applied at low temperatures, then cable compactness is maintained, but transmission loss increases due to poor low-temperature properties
Solution Approach 1:
The primary resin layer is designed with specific material properties (polyol compound with ≤3.5% primary hydroxyl groups) to provide preemptive cushioning against lateral pressure that may occur at low temperatures, protecting the glass fiber before pressure is applied.
Solution Approach 2:
The coating system uses a composite structure with two resin layers having different material compositions. The primary layer uses a polyol-based cured resin while the secondary layer uses a different formulation optimized for high Young's modulus at low temperature, creating a composite material system that simultaneously provides cushioning and structural support.
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 dual-layer resin system effectively reduces transmission loss at low temperatures, enhancing the low-temperature properties of optical fibers, making them suitable for smaller diameter cables with multiple fibers.
Implementation Method 1
the primary resin layer comprising a cured resin composition obtained by curing a resin composition comprising an oligomer, a monomer, and a photopolymerization initiator
Data Source
AI summary
An optical fiber comprises a glass fiber and a coating resin layer covering the glass fiber, the coating resin layer having a primary resin layer and a secondary resin layer, the primary resin layer comprising a cured resin composition obtained by curing a resin composition comprising an oligomer, a monomer, and a photopolymerization initiator, wherein the oligomer is a reaction product of a polyol compound, an isocyanate compound, and a hydroxyl group-containing (meth)acrylate compound; a proportion of a primary hydroxyl group of hydroxyl groups included in the polyol compound is 3.5% or less; and a Young's modulus of the secondary resin layer at −40° C. is 1780 MPa or more.