Optical Ferrule Segmented Pad Debris Wiping Mechanism
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Solution Overview
Problem
Optical ferrules in optical communications face alignment errors due to debris accumulation, which can cause significant insertion loss, especially in single mode expanded beam optical interconnect devices, where small angular errors can lead to substantial misalignment.
Innovation Solution
Incorporating pairs of leading and trailing pads or platforms on the mating surfaces of optical ferrules, where the leading pads wipe debris off the trailing pads during mating, ensuring that only the cleaned trailing pads contact each other upon full mating, preventing debris-induced alignment errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single mating surface is used for optical ferrules, then the structure is simple, but debris accumulates on the contact surface causing alignment errors
Solution Approach 1:
The mating surface is segmented into multiple discrete pads (first pads and second pads) instead of using a single continuous surface. This segmentation allows different pads to perform different functions: leading pads wipe debris while trailing pads provide stable contact, thereby preventing debris accumulation and maintaining alignment accuracy without requiring a completely complex new structure
Solution Approach 2:
The leading pads perform a preliminary wiping action on the mating surface during the approach phase of coupling. This preliminary action removes debris from the surface before the trailing pads make final contact, ensuring that the primary load-bearing and alignment-critical surfaces are clean, thus preventing debris-induced alignment errors
2Manufacturing precision
If leading pads are added to wipe debris, then alignment accuracy improves, but the number of pads increases causing more complex manufacturing
Solution Approach 1:
The mating surface is divided into discrete pads that can be manufactured as separate elements and then assembled or integrated into the ferrule. This segmentation allows for standardized pad fabrication processes and simplifies quality control compared to machining complex continuous surfaces, as each pad can be manufactured with standard tolerances and then positioned precisely
Solution Approach 2:
Different regions of the mating surface (different pads) are given different functional qualities: leading pads are designed for wiping motion while trailing pads are designed for stable contact. This local differentiation allows each pad to be optimized for its specific function, improving overall manufacturing precision while keeping individual pad fabrication relatively simple and standardized
3Reliability
If multiple pairs of pads are used, then debris prevention is enhanced, but the device structure becomes more complex
Solution Approach 1:
The mating surface is segmented into multiple pairs of pads arranged in a systematic pattern. This segmentation into discrete, repeatable units allows for scalable design where the same basic pad pair structure can be replicated multiple times, enhancing debris removal effectiveness through multiple wiping actions while avoiding the complexity of entirely unique structures for each pad
Solution Approach 2:
Multiple pairs of pads are arranged to work together in a coordinated manner during the coupling process. The pads are positioned and dimensioned so that they function as an integrated wiping and contact system, where the combined action of multiple pads provides enhanced debris removal while maintaining a relatively compact and organized structure that does not excessively increase device complexity
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 configuration effectively prevents debris from causing alignment errors, maintaining accurate optical coupling and reducing insertion loss by ensuring clean contact surfaces during mating, thereby improving the reliability of optical connections.
Implementation Method 1
The light redirecting surface is configured to receive light along a first direction from an optical waveguide received and supported in the first groove and redirect the received light along a different second direction
Data Source
AI summary
A first optical device is adapted to couple to a second optical device along a coupling direction and includes two spaced apart pairs of leading and trailing pads, such that when the first optical device lands and slides on a landing surface of the second optical device to optically couple to the second optical device, and for each pair of leading and trailing pads, the leading pad prevents any debris on the landing surface from collecting on the trailing pad. Upon full coupling of the first optical device with the second optical device, the leading pads do not make contact with the landing surface. The first optical device may be, for example, an optical ferrule or a cradle having a recess adapted to receive an optical ferrule.