High Fiber Count Blown Optical Fiber Unit Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Increasing the number of optical fibers in blown optical fiber units beyond the current maximum of twelve results in increased diameter, leading to reduced airflow and stiffness, which limits blowing distance and performance, especially through routes with bends.
Innovation Solution
The optical fiber unit is designed with a plurality of stranded sub-units around a central member, each sub-unit comprising optical fibers within a soft inner and harder outer layer with embedded particulate material, and a binder to maintain arrangement, allowing for reduced stiffness and improved blowing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of optical fibers is increased beyond twelve, then the fiber count capability is improved, but the diameter increases leading to reduced airflow and limited blowing distance
Solution Approach 1:
The optical fiber unit is divided into multiple sub-units, each containing a subset of the total optical fibers. These sub-units are arranged in a concentric configuration around a central member, allowing the high fiber count to be achieved while maintaining a compact overall diameter through efficient spatial organization.
Solution Approach 2:
The patent transitions from a traditional linear or flat arrangement of fibers to a three-dimensional concentric configuration. Sub-units are positioned at different radial distances from the central member, creating a multi-layered structure that maximizes fiber density while controlling the outer diameter.
2Quantity of substance
If the number of optical fibers is increased, then the fiber count capability is improved, but the stiffness increases reducing ability to navigate bends
Solution Approach 1:
Different sub-units are assigned different material properties and structural characteristics. The outer layers may use softer materials while inner layers provide structural support, creating a gradient of properties that reduces overall stiffness while maintaining the ability to accommodate high fiber counts.
Solution Approach 2:
The patent employs composite material structures within the sub-units and outer layers, combining materials with different mechanical properties. This allows the unit to achieve high fiber count while maintaining flexible characteristics necessary for navigating bends in the ductwork.
3Volume of moving object
If the diameter is reduced to maintain blowing performance, then the airflow is maintained, but the fiber count is limited
Solution Approach 1:
Sub-units containing optical fibers are nested concentrically around a central member, with each sub-unit positioned at a different radial distance. This nested configuration allows multiple layers of fibers to be packed within a compact diameter, achieving high fiber count without increasing the overall unit size.
Solution Approach 2:
The patent optimizes various parameters including sub-unit diameter, wall thickness, material density, and spacing between sub-units to maximize fiber packing efficiency. By carefully adjusting these parameters, the design achieves high fiber count while maintaining a diameter suitable for air-blown installation.
Data Source
AI summary
An optical fiber unit for air-blown installations includes a plurality of optical fiber sub-units and a central member, wherein the optical fiber sub-units are stranded around the central member; wherein each of the optical fiber sub-units includes a number of optical fibers, an inner layer which is radially outer to the optical fibers, and an outer layer which is radially outer to the inner layer, wherein the outer layer includes particulate material which is partially embedded into the outer layer; and wherein the optical fiber unit further includes a binder for keeping the stranded optical fiber sub-units in a proper arrangement.