Laser Optical Fiber Coating Removal Preserving Tensile Strength
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Solution Overview
Problem
Conventional methods for removing polymer coatings from optical fibers, such as hot-gas stripping, mechanical stripping, and laser stripping, often damage the fibers, fail to fully remove the coating, and require extensive consumables or chemicals, leading to issues with tensile strength and manufacturing efficiency.
Innovation Solution
A laser-based coating removal system that applies tension to the optical fiber and scans the laser beam across the fiber from multiple radial positions to uniformly remove the coating, minimizing thermal stress and preserving tensile strength, while also optionally cleaving the fiber to create a bulletnose shape for precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional laser stripping is used to remove polymer coating from optical fiber, then coating removal is achieved, but tensile strength of the fiber is weakened
Solution Approach 1:
The patent applies different laser parameters to different regions of the optical fiber. The laser beam is focused to selectively remove polymer coating while controlling energy distribution to preserve the glass fiber's tensile strength. The localized application of thermal energy achieves coating removal without compromising the structural integrity of the fiber core and cladding.
Solution Approach 2:
The patent optimizes laser processing parameters including wavelength, pulse duration, power density, and scanning speed to achieve selective coating removal. By carefully controlling these parameters, the process removes the polymer coating while minimizing thermal damage to the glass fiber, thereby preserving tensile strength.
2Loss of substance
If conventional laser stripping is used, then coating removal is achieved, but processing speed is too slow requiring physical movement of optical fiber
Solution Approach 1:
The patent employs a dynamic scanning system where the laser beam is rapidly scanned across the optical fiber surface in a controlled pattern. This scanning approach allows the laser to remove coating material efficiently along the fiber length without requiring physical movement of the fiber itself, thereby increasing processing speed while maintaining coating removal effectiveness.
3Loss of substance
If conventional laser stripping is used, then coating removal is achieved, but coating is not fully removed obstructing fiber insertion
Solution Approach 1:
The patent implements a continuous laser scanning process that systematically traverses the entire surface of the optical fiber. The scanning pattern ensures complete coverage of the fiber circumference and length, with overlapping passes that guarantee full coating removal. This continuous action prevents any residual coating from obstructing fiber insertion into connectors.
4Loss of substance
If conventional laser stripping equipment is used, then coating removal is achieved, but equipment occupies large manufacturing space
Solution Approach 1:
The patent describes a laser processing system that can perform multiple functions including coating removal, fiber cleaving, and potentially other fiber preparation operations. This multi-functional approach consolidates what would traditionally require separate equipment into a single compact system, reducing the overall manufacturing space required while achieving complete fiber preparation.
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 system efficiently removes the polymer coating while retaining at least 50% of the optical fiber's tensile strength, reducing damage and the need for consumables, and allows for precise fiber alignment in connectors, enhancing manufacturing efficiency and fiber performance.
Implementation Method 1
A laser beam may be directed at the protective coating to remove the protective coating by one or more ablating, melting, vaporizing, and/or thermal decomposing processes.
Implementation Method 2
laser stripping utilizes one or more laser beams to strip the polymer coatings from glass optical fibers using a vaporization or ablation process
Implementation Method 3
A laser beam may be directed at the protective coating to remove the protective coating by one or more ablating, melting, vaporizing, and/or thermal decomposing processes.
Implementation Method 4
A laser beam may be directed at the protective coating to remove the protective coating by one or more ablating, melting, vaporizing, and/or thermal decomposing processes.
Data Source
Figure 1~2B
Figure 3A~3B-1
Figure 3B-2~3B-4
AI summary
Coating removal systems for optical fibers are disclosed. Related methods and optical fibers processed with these methods and coating removal systems are also disclosed. An optical fiber includes a glass fiber, having a cladding and core, surrounded by a protective coating which does not contribute to the optical performance of the optical fiber. By removing the coating at an end portion of the optical fiber, the end portion may be precisely positioned and secured to enable reliable optical communications. A laser beam may be directed at the protective coating to remove the protective coating by one or more ablating, melting, vaporizing, and/or thermal decomposing processes. The optical fiber may also be optionally cleaved. In this manner, the coating may be efficiently removed while retaining at least fifty percent of the tensile strength of the optical fiber. A connectorized fiber optic cable assembly is also disclosed.