Unjacketed Fiber Optic Cable Assembly With Travel Limited Ferrule
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Solution Overview
Problem
Conventional fiber optic cable assemblies rely on tensile strength members for mechanical coupling with connectors, which can limit flexibility, scalability, and configurability, particularly in hyperscale data centers where optical fiber density, cost, and ease of configuration are critical.
Innovation Solution
Fiber optic cable assemblies without tensile strength members, featuring tight buffers connected by a reduced thickness buffer region that can be manually torn to function as a zip cord, and incorporating a travel limiting feature in the ferrule to prevent decoupling from mating ferrules under tensile loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tensile strength members are mechanically coupled with connectors, then tensile loads are prevented from bearing on optical fibers, but device complexity and cost increase
Solution Approach 1:
The patent removes tensile strength members and their mechanical coupling structures from the connector assembly. Instead of using separate strength members coupled to the connector, the design relies on the ferrule-to-ferrule mechanical engagement and the bonded optical fiber-to-ferrule connection to withstand tensile loads, thereby simplifying the overall structure while maintaining reliability
Solution Approach 2:
The patent combines the tensile load-bearing function into the ferrule and optical fiber bond itself, rather than using a separate mechanical coupling system. The ferrule engagement and fiber-to-ferrule bond serve dual purposes: optical alignment and mechanical strength, eliminating the need for additional tensile strength members
2Reliability
If tensile strength members are mechanically coupled with connectors, then optical fibers are protected from tensile loads, but flexibility and configurability are reduced
Solution Approach 1:
By removing the rigid mechanical coupling structure between tensile strength members and connectors, the patent enables greater flexibility in cable routing and connector positioning. The simplified design allows for easier adaptation to different configurations in field deployments, particularly in hyperscale data center environments where scalability is critical
Solution Approach 2:
The patent creates a more dynamic and adaptable system by eliminating fixed mechanical coupling points. The flexible cable design with integrated ferrule engagement allows for easier reconfiguration, movement, and adaptation to different spatial arrangements without being constrained by rigid strength member attachments
3Volume of moving object
If reduced thickness buffer connecting region is used, then cable size is reduced, but tensile strength may be compromised
Solution Approach 1:
The patent changes the critical parameter for tensile strength from the buffer connecting region to the ferrule-to-ferrule engagement and optical fiber-to-ferrule bond. By shifting the load-bearing mechanism to these stronger, more compact interfaces, the design can reduce buffer thickness while maintaining or even improving overall tensile strength
Solution Approach 2:
The patent employs composite material strategies by combining the mechanical engagement of ferrules with the bonded connection of optical fibers to ferrules. This composite approach creates a unified load-bearing system that is both strong and compact, allowing reduced buffer thickness without compromising tensile strength
4Reliability
If travel limiting feature is added to ferrule, then decoupling is prevented under tensile loads, but device complexity increases
Solution Approach 1:
The travel limiting feature is designed to prevent decoupling before it can occur under tensile loads. By incorporating this preventive mechanism into the ferrule structure, the patent addresses potential reliability issues without requiring complex external locking systems, maintaining a relatively simple overall design
Data Source
AI summary
A fiber optic cable assembly comprises first and second cable legs each including a tight buffer surrounding coated optical fibers, and a reduced thickness buffer connecting region, with cable leg being devoid of any surrounding jacket and any tensile strength member. A fiber optic cable assembly devoid of a tensile strength member mechanically coupled to a connector comprises a travel limiting feature that serves to limit travel of the ferrule and inhibit ferrule decoupling when tension is applied to a fiber optic cable.