Fiber Optic Connector Ferrule Travel With Fiber Take-Up Region
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Solution Overview
Problem
Fiber optic connectors face challenges in maintaining signal quality due to unacceptable bending of optical fibers when ferrules are moved proximally relative to the connector housings, which can lead to signal degradation and require accommodation of macrobending within the connector housings.
Innovation Solution
The fiber optic connector design includes a fiber take-up region with controlled macrobending features and a crimp sleeve to anchor the optical fiber to the connector housing, preventing tensile loads from affecting the ferrule assembly and ensuring predictable, repeatable macrobending of the optical fiber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ferrule assembly is moved proximally relative to the connector housing during connector mating, then the optical fibers are forced together to establish optical connection, but the optical fibers experience unacceptable bending that degrades signal quality
Solution Approach 1:
The connector housing is divided into a first housing portion and a second housing portion that can move relative to each other. The first housing portion moves with the ferrule assembly during connector mating, while the second housing portion remains stationary and contains the fiber take-up region. This segmentation allows the ferrule assembly to move proximally for connection while the fiber take-up region accommodates the resulting fiber bending without degrading signal quality.
Solution Approach 2:
The fiber take-up region is configured to accommodate macrobending of the optical fiber in a direction transverse to the longitudinal axis of the connector. By allowing the fiber to bend in a transverse direction rather than resisting the proximal movement, the system accommodates the necessary fiber displacement during connector mating while maintaining acceptable signal quality.
2Strength
If conventional anchoring techniques are used to secure the cable to the connector housing, then the cable is firmly attached, but tensile loads are transferred to the ferrule assembly causing potential optical disconnection
Solution Approach 1:
The fiber take-up region is configured to receive and accommodate the optical fiber in a way that isolates the ferrule assembly from tensile loads. The fiber take-up region absorbs the mechanical stress, preventing force transmission to the ferrule assembly and maintaining stable optical connection even when the cable is subjected to tensile forces.
3Object-affected harmful factors
If the connector housing is designed to accommodate macrobending of optical fibers, then signal quality is maintained during ferrule movement, but the connector housing becomes more complex
Solution Approach 1:
The connector housing is segmented into functional portions: the first housing portion that moves with the ferrule assembly and the second housing portion that remains stationary and contains the fiber take-up region. This segmentation allows the complex fiber accommodation function to be isolated in a specific region while keeping the rest of the connector structure relatively simple.
Solution Approach 2:
The fiber take-up region is specifically configured with local structural features to accommodate macrobending, while the rest of the connector housing maintains conventional structures. This localized approach to complexity allows signal quality maintenance during ferrule movement without requiring the entire connector housing to be overly complex.
Data Source
AI summary
A connector includes a ferrule assembly having a ferrule, a hub and a spring, the ferrule having a distal face accessible at a distal end of the connector housing, the ferrule being movable in a proximal direction relative to the connector housing. The distal and proximal positions are separated by an axial displacement distance. The ferrule proximal movement is against the spring's bias. The cable of the assembly includes an optical fiber contained within a jacket and also a strength layer between the fiber and the jacket that is anchored to the connector housing. The fiber extends through a fiber from the proximal end of the connector housing to the ferrule. The fiber has a distal portion potted within the ferrule. The fiber passage has a fiber take-up region configured to take-up an excess length of the fiber corresponding to the ferrule axial displacement.