Floating Ferrule Optical Module Alignment Stability
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Solution Overview
Problem
In optical communications, single mode MT ferrules experience significant wiggle losses due to relative movement between connector and module ferrules, leading to signal degradation, which existing solutions have been unable to effectively prevent or minimize.
Innovation Solution
The optical communications module incorporates a floating ferrule arrangement within the module housing, allowing the module ferrule to move in limited ways, ensuring that the ferrules remain aligned and move as a unit when a tilt force is applied, thereby preventing relative movement and associated losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If rigid features are incorporated into the connector and module housing to prevent relative movement between ferrules, then alignment stability is improved, but device complexity increases and manufacturing difficulty increases
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a rigid fixed arrangement to a floating arrangement that allows controlled movement. The module ferrule is positioned in a cavity with clearance, enabling it to float and move dynamically in response to external forces while maintaining alignment through elastic deformation of the housing rather than rigid constraints
Solution Approach 2:
The patent changes the physical parameters of the housing by incorporating elastic properties. The housing is designed to elastically deform under external forces, allowing the ferrule to move with the housing rather than resist movement, thereby maintaining alignment stability without rigid features
2Stability of the object's composition
If rigid features are incorporated into the connector and module housing to prevent relative movement between ferrules, then alignment stability is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent simplifies manufacturing by eliminating the need for precision-rigid features and complex assembly constraints. The floating ferrule design requires only adequate clearance in the housing cavity, allowing for more tolerant manufacturing specifications and easier assembly processes
3Reliability
If a floating arrangement is used to allow the module ferrule to move within limits, then wiggle losses are reduced by maintaining alignment, but device complexity increases
Solution Approach 1:
The patent extracts the alignment maintenance function from complex mechanical constraint features and implements it through the simplified floating arrangement. By removing the ferrule from rigid constraints and allowing it to float in a cavity, the design achieves reliability improvement with minimal additional structural complexity
Data Source
AI summary
A ferrule of an optical communications module is allowed to float to a limited degree within the module housing. Consequently, if a force is exerted on the connector that mates with the optical communications module, the mated ferrules of the module and of the connector moves, or floats, within defined limits so that the ferrules move together rather than relative to one another. In this way, the end faces of the ferrules remain in precise alignment to prevent wiggle losses from occurring due to movement of the connector relative to the module housing.