Optical Fiber Coating Removal Using Hot Gas Stream
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Solution Overview
Problem
Existing methods for removing protective coatings from optical fibers are either mechanically damaging, chemically hazardous, or inefficient, particularly when dealing with arrays of fibers, and often result in uneven coating removal and contamination.
Innovation Solution
A method and apparatus using a stream of hot gas to soften and remove the coating from optical fibers, with a fiber collection and support device guiding the fiber through a hot gas stream, ensuring the gas temperature and velocity are sufficient to remove the coating without damaging the fiber, and a gas heater creating a controlled hot zone for effective coating removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical stripping is used to remove coating, then coating removal is achieved, but fiber surface is scratched and weakened
Solution Approach 1:
The patent replaces mechanical stripping with thermal softening followed by controlled coating detachment. A heating element softens the coating material, allowing it to be removed by gentle mechanical action or capillary forces rather than harsh mechanical scraping, thus avoiding fiber surface damage while maintaining removal efficiency
Solution Approach 2:
The patent changes the temperature parameter of the coating material to alter its physical state. By heating the coating above its glass transition temperature, the coating becomes soft and pliable, enabling removal without mechanical damage to the underlying fiber. This parameter change allows the coating to be removed intact while preserving fiber surface quality
2Productivity
If chemical stripping is used to remove coating, then coating removal is achieved, but contaminants and residual coating remain on fiber surface
Solution Approach 1:
The patent substitutes chemical stripping with thermal softening. Instead of using caustic chemicals that leave residues, the heating element softens the coating through controlled thermal energy, allowing for clean removal without chemical contamination. The coating is removed by physical detachment rather than chemical dissolution, ensuring a cleaner fiber surface
Solution Approach 2:
The patent converts the harmful effect of heat (which could damage the fiber) into a beneficial process. By precisely controlling the heating temperature and duration, the thermal energy softens the coating for removal while the heat is dissipated before reaching levels that would damage the fiber. The potential harm of thermal energy is transformed into a useful softening effect
3Ease of operation
If manual mechanical stripping is used, then coating removal is achieved, but operator dependency and inconsistency increase
Solution Approach 1:
The patent implements automated control where the heating element and coating removal process operate independently of manual intervention. The system automatically controls heating temperature, duration, and coating detachment, eliminating operator variability. The process self-regulates through programmed parameters, ensuring consistent results across different operators and conditions
Solution Approach 2:
The patent incorporates feedback mechanisms to monitor and adjust the heating process in real-time. Temperature sensors and process controllers ensure that heating parameters remain within optimal ranges, automatically adjusting power delivery to maintain consistent coating softening and removal. This feedback control eliminates operator dependency and ensures reproducible results
4Productivity
If high temperature hot gas is used to remove coating, then coating removal efficiency improves, but fiber damage risk increases
Solution Approach 1:
The patent applies localized heating directly to the coating layer rather than heating the entire fiber. The heating element is positioned to target only the coating material, providing sufficient temperature for softening while the bulk fiber remains at lower temperatures. This spatial differentiation allows high temperature processing of the coating without damaging the fiber
Solution Approach 2:
The patent uses periodic or pulsed heating cycles rather than continuous high-temperature exposure. The heating element applies thermal energy in controlled intervals, softening the coating during heated phases and allowing cooling during off-phases. This periodic action accumulates sufficient thermal effect for coating removal while preventing sustained high temperature damage to the fiber
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
This approach provides a clean, efficient, and inexpensive method for removing coatings from optical fibers, minimizing damage and contamination, and is suitable for arrays of fibers, ensuring the fiber strength is maintained and the process is less operator-dependent.
Implementation Method 1
directing a stream of a hot gas onto the protective coating material that is to be removed, the temperature and velocity of the hot gas being sufficiently high to soften and remove the protective coating material
Data Source
AI summary
A method for removing a protective coating material from a portion of an optical fiber including a glass optical fiber having an outer surface surrounded by said protective coating material, said method comprising the steps of: (i) providing a fiber collection and support device having: (a) a coarse conical fiber collector having an input port and (b) a fine fiber centering collector including a fiber tube having an output port, said input port is larger then said output port; (ii) providing the fiber threaded through the course conical collector into the fiber collection tube of the fine fiber centering collector; (iii) contacting the fiber, as it exits from the output port of the fiber collection tube of the fiber collection and support device, with a stream of hot gas; and (iv) directing a stream of a hot gas onto the protective coating material that is to be removed.