Ferrule Assembly Laser Cleaving and Interferometric Positioning
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Solution Overview
Problem
The conventional method of preparing ferrule assemblies for optical coupling is time-consuming and wasteful due to the need for post-insertion polishing, which often results in defective assemblies from improper cleaving and polishing techniques, leading to variations in fiber protrusion and co-planarity.
Innovation Solution
A method that involves precisely positioning the prepared fiber end face geometry before securing it in the ferrule, using techniques like laser cleaving and measuring systems such as interferometers or machine vision to ensure accurate placement, eliminating the need for post-insertion polishing and reducing waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual mechanical cleaving and abrasive polishing are used, then fiber end face geometry can be prepared, but the process is time-consuming and skill-intensive with significant variation in results
Solution Approach 1:
The patent replaces manual mechanical cleaving tools and abrasive polishing processes with laser-based processing. The laser cleaving device uses optical energy to cleanly sever the fiber end, eliminating the need for mechanical cleaving tools and subsequent manual polishing, thereby reducing both time and skill requirements while improving precision.
Solution Approach 2:
The patent introduces automated control of processing parameters including laser power, pulse duration, and positioning accuracy. By precisely controlling these parameters, the system achieves consistent fiber end face geometry without relying on operator skill, significantly reducing variation in results.
2Reliability
If post-insertion polishing is performed to achieve desired protrusion and co-planarity, then optical coupling quality improves, but defective assemblies are discarded due to under- or over-polishing
Solution Approach 1:
The patent performs fiber cleaving and positioning before insertion into the ferrule assembly. By preparing the fiber end face geometry in advance with laser cleaving and using measuring systems to verify protrusion and co-planarity, the need for post-insertion polishing is eliminated, preventing defective assemblies and reducing waste.
Solution Approach 2:
The patent incorporates measuring systems that provide real-time feedback on fiber positioning, protrusion, and co-planarity. This feedback mechanism allows for immediate adjustments before final assembly, ensuring optical coupling quality without requiring post-insertion polishing and preventing defective assemblies.
3Manufacturing precision
If multiple manual polishing steps are required, then fiber end co-planarity can be achieved, but the process requires high skill level and produces significant variation
Solution Approach 1:
The patent replaces multiple manual polishing steps with a single laser processing step followed by automated positioning. The laser cleaving creates a precise end face geometry, and automated positioning mechanisms achieve the desired co-planarity without requiring operator skill or multiple iterative polishing operations.
Solution Approach 2:
The patent uses controlled laser parameters and automated positioning to achieve consistent co-planarity. By precisely controlling laser energy delivery and fiber positioning, the system eliminates the need for skill-intensive manual polishing while maintaining high manufacturing precision.
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 simplifies the assembly process, reduces waste, and ensures consistent fiber end protrusion and co-planarity, leading to a higher yield of satisfactory ferrule assemblies with improved optical coupling efficiency.
Implementation Method 1
preparing a distal end of an optical fiber to provide a prepared fiber end having a desired end face geometry
Implementation Method 2
using techniques like laser cleaving and measuring systems such as interferometers or machine vision to ensure accurate placement
Data Source
AI summary
A method for preparing a ferrule assembly avoids polishing while providing adequate control over fiber end protrusion and co-planarity. A distal end of the fiber is prepared before securing the fiber in a ferrule, and before or after inserting the fiber into the ferrule. The prepared fiber is manipulated to provide a desired spatial relationship between the fiber end and the ferrule's end face, and then secured to maintain the desired spatial relationship. Preferably, the fiber end is prepared using a laser cleaving technique to provide a suitable end without abrasive polishing. An interferometer may be used to obtain measurements, during manipulation of the prepared fiber within the ferrule, that indicate whether the prepared fiber is satisfactorily positioned. In accordance with other aspects of the invention, a ferrule assembly prepared in accordance with the method, and a connector or other optical package including such a ferrule assembly are provided.