MPO Connector Pin Clamp Reduces Off-Center Loading
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Solution Overview
Problem
MPO connectors with high fiber counts are susceptible to rocking effects due to off-center loading, leading to uneven pressure on ferrule end faces, increased insertion loss, and decreased return loss, as existing solutions that increase load per fiber can cause fiber damage and pistoning.
Innovation Solution
The internal assembly of the MPO connector design includes a pin clamp that centrally locates the spring contact surface on the ferrule, reducing off-center loading by transferring the spring load closer to the longitudinal centerline, thereby minimizing moments applied about the x and y axes, and using a retractable pin assembly to further reduce offset forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the load to the ferrule is increased to ensure good physical contact, then fiber contact is improved, but fiber damage and pistoning occur due to high stress at fiber tips
Solution Approach 1:
The spring force is distributed across multiple contact points on the ferrule end face rather than concentrated at a single point. The pin clamp structure creates multiple localized contact zones that collectively bear the spring load, reducing stress at any single fiber tip while maintaining overall contact quality.
Solution Approach 2:
The pin clamp acts as an intermediary element between the spring and the ferrule. It transfers the spring force through multiple contact points to the ferrule end face, serving as a load-distributing mediator that prevents direct high-stress concentration on individual fiber tips.
2Productivity
If the fiber count density is increased to meet demand for higher density, then connector capacity is improved, but susceptibility to rocking effects and off-center loading increases
Solution Approach 1:
The pin clamp structure is designed with asymmetric contact points positioned at specific locations on the ferrule end face. These contact points are strategically placed to create a stable geometric configuration that resists rocking moments, with the asymmetric arrangement providing inherent stability against off-center loading.
Solution Approach 2:
The invention replaces traditional single-point spring contact with a multi-point contact system. This mechanical substitution distributes the loading across multiple points, transforming the single-point stress concentration into a distributed stress pattern that inherently resists rocking effects and maintains stability under off-center loads.
3Loss of energy
If off-center loading is applied to the ferrule, then insertion loss increases and return loss decreases, but the root cause is uneven pressure on the ferrule end face
Solution Approach 1:
The pin clamp creates multiple localized contact points with specific pressure distribution characteristics. Each contact point applies controlled local pressure to the ferrule end face, and the collective effect of these localized contacts achieves uniform overall pressure distribution, eliminating the uneven pressure that causes off-center loading effects.
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 design significantly reduces offset forces in both directions, improving fiber contact between rows and quadrants, minimizing insertion loss and maximizing return loss, while avoiding fiber damage by distributing the spring force directly to the fiber tips without excessive stress.
Implementation Method 1
a coil spring for exerting the biasing force
Implementation Method 2
The pin clamp contacts the back of the ferrule via a pair of contact surfaces... This design prevents any substantial off-center loading
Data Source
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AI summary
This application describes an MPO type connector with an internal assembly having a pin clamp (110), ferrule (112), and fiber array. The pin clamp that has a pair of contact surfaces (118) abutting the ferrule. The contact surfaces are located along the mid-point of the height of the ferrule on either side of and proximate to the fiber array.