Pulling Grip Assembly for Fiber Optic Cable Installation
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Solution Overview
Problem
The installation of high fiber-count optical fiber cables in data centers is labor-intensive and time-consuming due to the need for fusion splicing, which is skill-dependent and requires significant labor, and pre-terminating cables poses challenges in fitting them into small spaces and protecting them from environmental conditions during routing.
Innovation Solution
A pre-terminated fiber optic cable assembly with a pulling grip assembly that provides sealed protection for the fiber end sections, allowing for easier installation by applying a tensile load and using pressurized air to push the cables through ducts, while maintaining a small footprint to fit within limited spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fusion splicing is used to connect optical fibers, then the connection quality can be improved, but the installation time and labor requirements increase significantly
Solution Approach 1:
The optical fibers are pre-terminated with connection interfaces at the factory before cable installation. This preliminary action eliminates the need for time-consuming fusion splicing in the field, reducing installation time from two weeks to a fraction of that time while maintaining consistent connection quality through controlled factory conditions.
Solution Approach 2:
The patent replaces the complex fusion splicing process with a simpler mechanical connection system using pre-terminated connectors and adapters. This substitution eliminates the need for skilled technicians to perform delicate fusion splicing operations, significantly reducing both time and skill requirements.
2Ease of manufacture
If pre-termination components are added to optical fibers, then field splicing is eliminated, but the cable diameter increases making it difficult to fit through ducts
Solution Approach 1:
The patent nests multiple optical fibers and their termination components within a compact cable structure. The connection interfaces are arranged in a space-efficient manner, with ferrules and connectors positioned to minimize overall cable diameter while still allowing pre-termination of multiple fibers.
Solution Approach 2:
The patent optimizes the spatial arrangement of pre-terminated fibers by utilizing three-dimensional space efficiently. Connection interfaces are arranged in layers or banks perpendicular to the cable axis, allowing high fiber counts to be packed into a small diameter cable that can still navigate existing ducts.
3Ease of operation
If pre-terminated fiber ends are exposed during routing, then installation flexibility is maintained, but the fiber ends are vulnerable to environmental damage
Solution Approach 1:
The patent employs a flexible protective boot or sheath that covers the pre-terminated fiber ends during cable installation and routing. This protective covering shields the exposed fiber ends from environmental contaminants such as moisture and dust while remaining flexible enough to allow the cable to be pulled through ducts and routed as needed.
Solution Approach 2:
The protective boot is installed on the cable before field installation begins, providing beforehand protection for the vulnerable pre-terminated fiber ends. This pre-installation protective measure ensures that the fiber ends are shielded from environmental damage throughout the entire routing and installation process.
Data Source
AI summary
A fiber optic cable assembly comprises: a cable jacket; optical fibers carried within the cable jacket and extending beyond a first end of the cable jacket; a furcation body positioned on the first end of the cable jacket such that the optical fibers extend beyond the furcation body; and a pulling grip assembly having a proximal end selectively secured to the furcation body, a distal end opposite the proximal end, and an interior that contains fiber end sections. The interior of the pulling grip assembly is sealed off from an exterior of the cable assembly to provide sealed protection for the fiber end sections. The pulling grip assembly may include one or more air intake devices (e.g., cap or diaphragm) to harness energy from pressurized air used in a jetting process and thereby make it easier to pull the cable assembly through ducts.