Optical Fiber Termination Assembly with Precision Ferrule Alignment
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Solution Overview
Problem
Existing optical fiber connections using v-groove alignment suffer from misalignment and uneven force distribution due to manufacturing variations in fiber diameters, leading to increased insertion and return losses.
Innovation Solution
A housing with a locking mechanism that ensures precise alignment and orientation of optical fibers through a deformable splicer joint with radially symmetric forces, maintaining fiber tips in predetermined alignment and minimizing misalignment-induced losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If v-groove alignment is used to mechanically splice optical fibers, then the splicing process is simple and does not require electrical power, but manufacturing variations in fiber diameters cause misalignment and increase insertion and return losses
Solution Approach 1:
The patent transitions from the traditional symmetric v-groove alignment to an asymmetric configuration where fibers are held in separate ferrules with precision positioning features. The ferrules incorporate alignment keys, tapered bores, and precision-machined surfaces that provide asymmetric constraint mechanisms, ensuring precise core alignment despite manufacturing variations in fiber diameters. This asymmetric design allows for controlled positioning that compensates for the inherent symmetries and tolerances in conventional v-groove systems.
2Device complexity
If v-groove alignment is used, then the mechanical joint structure is simple, but force distribution on fibers is uneven leading to additional misalignment and losses
Solution Approach 1:
The patent applies local quality by providing differentiated support and constraint features at specific locations within the mechanical joint. The ferrules incorporate localized precision features such as tapered bores, alignment keys, and controlled-clearance interfaces that ensure uniform force distribution at critical contact points. These localized quality enhancements ensure that fibers are held with consistent positioning and even force distribution, preventing misalignment while maintaining overall joint simplicity.
3Strength
If fibers are held in v-groove with hard pad, then the fibers are locked in place, but the hard pad creates uneven pressure and potential fiber damage
Solution Approach 1:
The patent introduces precision ferrules as intermediary components between the mechanical joint structure and the optical fibers. These ferrules act as mediators that distribute holding forces uniformly across the fiber surfaces through precision-machined contact surfaces and tapered bores. The ferrules provide the necessary mechanical strength to hold fibers securely while eliminating stress concentration points, thereby preventing fiber damage and maintaining alignment integrity without requiring hard pads that create uneven pressure.
Data Source
AI summary
An assembly and method for splicing optical fibers is provided. A termination assembly may include a housing having an engagement element for engagement with an engagement component of a fixture and a support or splicer joint between which a first optical fiber extends in a longitudinal direction. A locking mechanism or a splicer joint may be operable to be biased against the first optical fiber to maintain an end of the first optical fiber at the support or the splicer joint fixed in position and only in a predetermined alignment with an end of a second optical fiber fixedly supported by the support or the splicer joint, such that the end of the second optical fiber is fixed at a predetermined orientation and a predetermined position at the support associated with the predetermined alignment by engagement of the engagement element with the engagement component.