MPO Adapter Latches for Secure MT Ferrule Positioning
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Solution Overview
Problem
In high fiber count applications, MPO-style connectors with spring biasing can cause MT ferrules to be dislocated or dislodged from adapters due to excessive force, leading to misalignment issues in optical connections.
Innovation Solution
An adapter design with a pair of latches connected along the longer edges of the first opening, featuring non-uniform thickness and a latch stop to securely engage and hold the multi-fiber ferrule, preventing dislocation and ensuring optical alignment with the fiber optic connector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If spring biasing is used in MPO-style connectors to mate multi-fiber ferrules, then connection force is improved, but the MT ferrule may be dislocated or dislodged from the adapter
Solution Approach 1:
The latch mechanism is divided into multiple segments: a latch body, a latch arm, and a latch stop. The latch arm can flex relative to the latch body, and the latch stop can engage at different positions on the ferrule. This segmentation allows the latch to accommodate the 20N force from the spring while preventing ferrule dislocation through progressive engagement stages.
Solution Approach 2:
The latch has non-uniform thickness along its length, with a thicker portion near the latch body and a thinner portion near the latch stop. This local quality variation allows the latch to flex appropriately under spring force while maintaining structural integrity. The varying thickness creates different stiffness zones that enable controlled deformation during mating while preventing excessive movement.
2Ease of manufacture
If latches and tabs are positioned away from the multi-fiber ferrule, then ease of manufacture is improved, but gaps allow the ferrule to move around within the adapter
Solution Approach 1:
The latch extends in a direction away from the first and second openings, creating a third dimension of engagement. Instead of positioning the latch directly adjacent to the ferrule in the same plane as the openings, the latch extends perpendicular to this plane, allowing the ferrule to be engaged from a different spatial dimension while maintaining manufacturing ease.
Solution Approach 2:
The latch acts as an intermediary element between the adapter body and the ferrule. It transfers the engagement force from the adapter structure to the ferrule through its non-uniform thickness profile, mediating the interaction to prevent ferrule movement while maintaining a practical manufacturing geometry.
3Ease of manufacture
If the latch has uniform thickness, then manufacturing simplicity is improved, but the latch cannot effectively engage the ferrule at multiple positions
Solution Approach 1:
The latch is designed with non-uniform thickness, having a thicker portion near the latch body and a thinner portion near the latch stop. This local quality variation allows the latch to engage the ferrule reliably at multiple positions while remaining manufacturable. The varying thickness provides different flexibility zones that enable progressive engagement.
Solution Approach 2:
The latch thickness parameter changes along the length of the latch structure. This parameter change allows the latch to adapt its stiffness and flexibility at different positions, enabling it to engage the ferrule at multiple positions reliably. The thickness transition creates optimal engagement characteristics without requiring complex manufacturing processes.
Data Source
AI summary
An adapter holds a multi-fiber ferrule in position to mate with a multi-fiber ferrule in a fiber optic connector. The adapter includes an adapter body that has a first opening in a first side of the adapter body that receives the multi-fiber ferrule and a second opening in the second side of the adapter body to removably receive the fiber optic connector. The adapter also includes a pair of latches connected to the adapter and disposed adjacent the first opening to engage and hold the multi-fiber ferrule in the adapter. The pair of latches are connected to the adapter body along longer edges of the first opening and extend in a direction away from the first and the second openings, the pair of latches having a terminal end and a non-uniform thickness between the adapter body and terminal ends.