Fiber Optic Cable with Periodic Thickness for LPG and Fiber Extraction
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Solution Overview
Problem
Existing optical fiber cables with LPG applied over the entire length face challenges in maintaining good workability for fiber extraction due to wide sheets covering all fibers, impairing connection operations.
Innovation Solution
An optical fiber cable design with periodically varying thickness linear materials abutting on optical fibers, allowing LPG application without covering the fibers, ensuring efficient mode coupling and easy fiber extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wide sheet is used to hold all optical fibers for LPG application, then LPG can be applied over the entire length of all fibers, but the workability of taking out optical fibers is greatly impaired
Solution Approach 1:
The patent divides the optical fiber cable into multiple stranded bundles, with each bundle containing a subset of optical fibers. LPG is applied individually to each bundle rather than to all fibers simultaneously with a single wide sheet. This segmentation allows LPG application to proceed without requiring a wide sheet that would impede fiber extraction, while still achieving complete LPG coverage across all fibers in the cable.
2Ease of manufacture
If the sheet houses all optical fibers, then LPG application is simplified, but connection workability is impaired due to covered fibers
Solution Approach 1:
Instead of using a single wide sheet to house all optical fibers, the patent segments the fibers into multiple stranded bundles. Each bundle is handled and processed separately for LPG application, which simplifies the manufacturing process for each individual bundle while maintaining overall LPG application effectiveness across the entire cable.
Solution Approach 2:
The patent transitions from a two-dimensional sheet-based approach to a three-dimensional stranded bundle structure. By arranging fibers in stranded bundles that extend along the cable length, the solution provides LPG application capability without requiring a wide sheet that would cover and obscure the fibers, thereby maintaining connection workability.
3Quantity of substance
If a large number of optical fiber cables are accommodated, then transmission capacity increases, but the sheet width must be increased which impairs fiber extraction
Solution Approach 1:
The patent organizes a large number of optical fiber cables into multiple stranded bundles, where each bundle contains a manageable subset of fibers. This segmentation allows LPG to be applied to each bundle independently without requiring an excessively wide sheet, thereby maintaining fiber extraction workability even when accommodating a large total number of cables.
Solution Approach 2:
By transitioning from a planar sheet arrangement to a three-dimensional stranded bundle configuration, the patent enables accommodation of a large number of optical fiber cables without increasing the required sheet width. The stranded structure allows fibers to be organized in multiple layers and orientations, increasing capacity while preserving extraction accessibility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enables a small-diameter optical fiber cable with LPG applied over the entire length, maintaining fiber extraction workability and efficient mode coupling.
Implementation Method 1
The LPG applies a periodic lateral pressure to the optical fiber, and the refractive index of the optical fiber core periodically vary by virtue of the lateral pressure to promote coupling between modes.
Implementation Method 2
the refractive index of the optical fiber core periodically vary by virtue of the lateral pressure
Data Source
AI summary
An object of the present disclosure is to enable LPG applied over the entire length of an optical fiber without inhibiting an operation of taking out the optical fiber.The present disclosure relates to an optical fiber cable in which at least one or more optical fibers for transmission in at least two or more modes are gathered, the optical fiber cable including: a linear material abutting on at least one of the optical fibers, in which a thickness of the linear material periodically varies in a longitudinal direction of the linear material.