Optical Fiber Array Laser Cleaving for Consistent Angled End Faces
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Solution Overview
Problem
Current methods for cleaving optical fibers, such as mechanical cleavers and polishing, face challenges like wear, chipping, and difficulty in achieving consistent angled tips, while laser cleaving struggles with heat-affected zones and swelling, necessitating a precise and efficient approach for angled cleaving of optical fiber arrays.
Innovation Solution
A process using a laser-cleaving apparatus that strips the coating from optical fibers, secures them in a holder, and uses an ultrafast laser to create perforations, followed by mechanical separation with pressurized air or tension, achieving controlled surface roughness and minimal cleave angle variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical cleavers are used to cleave optical fibers, then the cleaving process is simple and fast, but the cleave angle consistency and surface quality deteriorate due to wear and chipping
Solution Approach 1:
The patent replaces the mechanical cleaving system with a laser-based system. The laser beam melts and vaporizes the glass material through controlled heating, eliminating mechanical contact and associated wear. This substitution maintains high productivity while significantly improving cleave angle consistency and surface quality by using optical energy instead of mechanical force.
Solution Approach 2:
The patent changes the physical state and parameters of the laser beam to achieve precise control over the melting and vaporization process. By adjusting laser power, pulse duration, and scanning speed, the system achieves consistent cleave angles and surface quality while maintaining high processing speed, resolving the contradiction between productivity and manufacturing precision.
2Productivity
If CO2 lasers are used for angle cleaving, then mass production capability is achieved, but heat affected zone and fiber swelling increase
Solution Approach 1:
The patent changes the laser wavelength from CO2 (10.6 μm) to fiber laser (1.06 μm), which is better absorbed by glass. This parameter change reduces the heat affected zone by approximately 10 times while maintaining mass production capability. The shorter wavelength allows for more precise energy deposition and faster processing speeds, reducing overall thermal exposure.
Solution Approach 2:
The patent employs pulsed laser operation with precise control over pulse duration and repetition rate. This periodic action allows the material to cool between pulses, minimizing heat accumulation and reducing the heat affected zone. The pulsed regime enables mass production capability while controlling thermal damage through temporal separation of energy input.
3Manufacturing precision
If mechanical polishing is used to achieve angled tips, then the desired angle can be obtained, but the process time and cost increase significantly
Solution Approach 1:
The patent replaces the mechanical polishing system with a laser-based melting and vaporization system. This substitution eliminates the time-consuming mechanical abrasion process while achieving superior angle precision and surface quality. The laser directly melts and reshapes the glass at the desired angle, dramatically reducing processing time while maintaining or improving manufacturing precision.
Solution Approach 2:
The patent utilizes phase transitions of glass (solid to liquid to vapor) to achieve angled tips. The laser heats the glass beyond its melting point and into vaporization, allowing the material to be removed and reshaped at the precise desired angle. This phase transition-based approach is much faster than mechanical polishing while achieving superior precision.
4Speed
If laser cleaving with large beam size is used, then processing speed is maintained, but swelling and heat affected zone increase
Solution Approach 1:
The patent changes the laser beam parameters from large spot size to tightly focused small spot size. This parameter change increases the power density, enabling rapid melting and vaporization of glass with minimal heat diffusion to surrounding areas. The focused beam maintains high processing speed while dramatically reducing fiber swelling and heat affected zone by concentrating energy precisely where needed.
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
Enables precise, flexible cleaving of optical fibers with minimal swelling and consistent angles, maintaining high process yield and controlled surface roughness, suitable for applications like MEMS and expanded beam connectors.
Implementation Method 1
the laser system includes an ultrafast laser emitting a laser beam that is applied to form the perforation on the at least one optical fiber
Implementation Method 2
mechanical separation with pressurized air or tension
Data Source
AI summary
The present disclosure relates to a process by which an optical fiber array or a single optical fiber is cleaved with a laser-cleaving apparatus. The coating material is stripped or removed from a section of an optical fiber array or single optical fiber; a coated or ribbonized section of the optical fiber array or the single optical fiber is secured in a holder; the holder is aligned inside the laser-cleaving apparatus; the laser cleaves the stripped ends of the fibers in the optical fiber array or the single optical fiber; the laser-cleaved ends of the optical fiber(s) are then mechanically separated to remove the free ends from the optical fibers in the optical fiber array or the single optical fiber, leaving a cleaved array of optical fibers or a single cleaved optical fiber. The cleaving process enables the optical fiber array or single optical fiber to be cleaved at flexible locations along an optical fiber ribbon, optical fiber, or optical fiber apparatus (e.g., cleaving can be performed close to a ferrule end face) with no swelling, minimal cleave angle variation across the cores of the optical fibers, a controlled surface roughness of the optical fiber end faces, and high process yield.