Fiber Optic Distribution Cable Single Access Point Design
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Solution Overview
Problem
Conventional methods for distributing optical fibers from fiber optic cables are cumbersome, require multiple breaches in the cable jacket, and result in stiff, bulky distribution cables with limited flexibility, making it difficult to route them through ducts or sheaves during installation.
Innovation Solution
A fiber optic distribution cable design that allows a distribution optical fiber to protrude from a single small access location, with a length up to 5/4 times the access length, using a cutting tool to sever the fiber within the cable, and optional components like tether tubes and demarcation points to manage excess fiber length and prevent pistoning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a long breach is made in the cable jacket to access sufficient optical fiber length, then the required fiber length is available, but the cable becomes stiff and bulky, making routing difficult
Solution Approach 1:
The patent divides the cable structure into two functional zones: a sealed cable jacket portion and an accessible distribution zone. The breach is segmented into a minimal opening that maintains cable integrity while providing sufficient fiber access through strategic fiber routing and termination points within the breach area.
Solution Approach 2:
The patent utilizes the third dimension by creating a multi-layered breach structure where fibers are routed in different planes and orientations. This allows sufficient fiber length to be obtained through spatial arrangement rather than increasing the linear breach length, maintaining cable flexibility while providing adequate working length.
2Ease of operation
If multiple breaches are made in the cable jacket to access and present fiber, then fiber distribution is achieved, but the cable structure becomes complex and installation time increases
Solution Approach 1:
The patent designs a universal access mechanism where a single breach location can serve multiple functions: fiber access, fiber termination, and cable sealing. This multi-functional approach eliminates the need for multiple separate breaches while maintaining full fiber distribution capability.
Solution Approach 2:
The patent incorporates pre-positioned fiber routing paths and pre-configured termination points within the cable structure. This preliminary arrangement allows all necessary fiber access operations to be performed from a single breach location, avoiding the need for multiple breaches while reducing installation complexity.
3Ease of operation
If the cable jacket is breached to present optical fiber, then fiber distribution is enabled, but the protective covering is compromised, requiring bulky sealing
Solution Approach 1:
The patent extracts only the minimum necessary portion of the cable jacket to create a small access opening, preserving the majority of the protective covering. This minimal extraction approach maintains cable protection integrity while providing sufficient fiber access through strategic routing within the small opening.
Solution Approach 2:
The patent introduces intermediary components such as sealing plates, grommets, or adhesive sealants that mediate between the breached cable jacket and the external environment. These intermediaries restore protective function at the breach location without requiring bulky sealing structures, maintaining cable integrity while enabling fiber access.
Data Source
AI summary
A fiber optic distribution cable includes a jacket defining an exterior of the fiber optic distribution cable and a plurality of optical fibers extending through a cavity of the jacket. The jacket has an access location with a single opening formed in the jacket that extends to the cavity. A distribution optical fiber of the plurality of optical fibers extends through and protrudes from the single opening in the jacket at the access location and is secured by a demarcation point.