Colored Optical Fiber Coating for Lower Microbend Loss
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Solution Overview
Problem
Existing optical fibers with primary layers cured to near saturated Young's modulus face challenges in effectively suppressing microbend loss due to high Young's modulus.
Innovation Solution
A colored optical fiber design with a primary layer having a Young's modulus less than 70% of its saturated modulus, achieved by controlling the curing process through temperature management and ultraviolet irradiation of a first ultraviolet curing resin, is employed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the primary layer is cured to near the saturated Young's modulus, then the structural strength and stability are improved, but the microbend loss increases due to high rigidity
Solution Approach 1:
The patent applies parameter changes by controlling the curing degree of the primary layer through temperature management during the curing process. By limiting the curing temperature or duration, the Young's modulus is maintained below 70% of the saturated value, optimizing the balance between structural strength and microbend loss suppression without requiring material composition changes.
2Strength
If the Young's modulus of the primary layer is increased to improve protective capability, then the buffering performance against external forces deteriorates, leading to increased microbend loss
Solution Approach 1:
The patent utilizes parameter changes by adjusting the curing conditions (temperature, time) of the primary layer to achieve a specific Young's modulus range (below 70% of saturated value). This optimized parameter range provides sufficient protective capability while maintaining adequate flexibility to buffer external forces and suppress microbend loss.
3Stability of the object's composition
If the primary layer is fully cured to achieve maximum stability, then the flexibility and ability to absorb external stress are reduced, causing increased transmission loss
Solution Approach 1:
The patent applies parameter changes by controlling the curing degree through temperature management, achieving a partial curing state where the primary layer maintains adequate stability while retaining sufficient flexibility. The Young's modulus is kept below 70% of the saturated value, allowing the layer to absorb external stress effectively and reduce transmission loss.
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 design effectively suppresses microbend loss by maintaining a low Young's modulus in the primary layer, ensuring adequate buffering of external forces and reducing transmission loss.
Implementation Method 1
a primary layer formed of a first ultraviolet curing resin covering the bare optical fiber, and a secondary layer formed of a second ultraviolet curing resin covering the primary layer
Data Source
AI summary
A colored optical fiber comprises a bare optical fiber, a primary layer formed of a first ultraviolet curing resin covering the bare optical fiber, and a secondary layer formed of a second ultraviolet curing resin covering the primary layer, wherein a Young's modulus of the primary layer is smaller than 70% with respect to a saturated Young's modulus of the primary layer, and wherein the saturated Young's modulus of the primary layer is smaller than or equal to 0.85 MPa.