Bend-Resistant Fiber Optic Jumper Cable Design
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Solution Overview
Problem
Conventional fiber optic jumper cables are limited by their susceptibility to bending, which causes optical attenuation and restricts their use in tight spaces due to the need for additional strength elements that increase size and cost.
Innovation Solution
A fiber optic jumper cable design featuring a bend-resistant multimode optical fiber with a tensile-strength layer and a protective polyethylene jacket, eliminating the need for anti-buckling elements, allowing for tighter bending without performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If strength elements are embedded in the jumper to prevent bending beyond a select bending radius, then the jumper has sufficient mechanical strength, but the jumper cannot be sharply bent and occupies more space
Solution Approach 1:
The patent changes the physical parameters of the optical fiber by using bend-insensitive multimode fiber with a depressed-index cladding layer. This structural modification allows the fiber to tolerate sharp bends without significant optical attenuation, eliminating the need for rigid strength elements while maintaining mechanical flexibility and reducing the space required in telecommunications devices
Solution Approach 2:
The patent employs a composite structure consisting of a bend-insensitive optical fiber with a depressed-index cladding layer surrounding a core. This composite material design provides both mechanical flexibility and optical performance stability under bending conditions, replacing the need for separate strength elements
2Reliability
If conventional multimode optical fiber is used in jumpers, then the fiber can transmit light, but the fiber is highly sensitive to bending and requires additional strength elements
Solution Approach 1:
The patent modifies the optical fiber parameters by implementing a depressed-index cladding layer with a specific refractive index profile. This changes the light propagation characteristics to be less sensitive to bending, maintaining optical reliability without requiring complex cable structures with multiple strength elements
Solution Approach 2:
The patent extracts and eliminates the need for separate strength elements from the cable structure by incorporating bend-insensitivity directly into the optical fiber design. This simplifies the overall cable structure while maintaining optical performance
3Volume of moving object
If the jumper is designed to be flexible and sharply bendable to fit tight spaces, then the space occupation is minimized, but optical attenuation increases beyond allowable limits
Solution Approach 1:
The patent changes the optical fiber's physical parameters by using bend-insensitive multimode fiber with a depressed-index cladding layer. This allows the fiber to be sharply bent to fit tight spaces in telecommunications devices while maintaining low optical attenuation, resolving the contradiction between flexibility and energy loss
Data Source
AI summary
A fiber optic jumper cable having a central axis includes a bend-resistant optical fiber generally arranged along the central axis. A tensile-strength layer surrounds the bend-resistant optical fiber. A protective cover surrounds the tensile-strength layer and has an outside diameter DO in the range 1.6 mm≦DO≦4 mm.