Hollow-Core Fiber Cable with Microstructured Cladding
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Solution Overview
Problem
Conventional solid-core optical fibers suffer from low bandwidth capabilities and high latency, particularly at the 1310 nm wavelength band, which limits high-speed data transmission in telecommunications systems.
Innovation Solution
A hollow-core optical fiber with a microstructured cladding region surrounding a hollow core region, utilizing total internal reflection to guide light at 1310 nm, reducing signal leakage and attenuation, and allowing most light to travel in air, thereby minimizing non-linearity and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If solid-core optical fibers are used, then the fiber structure is simple and easy to manufacture, but the bandwidth capability is low and latency is high
Solution Approach 1:
The fiber is divided into distinct functional regions: a hollow core region for light propagation and a microstructured cladding region with periodic patterns. This segmentation allows the hollow core to provide low-latency transmission while the cladding provides the necessary optical confinement, resolving the contradiction between transmission performance and structural simplicity.
Solution Approach 2:
The microstructured cladding region employs a periodic array of holes or voids created through laser drilling or etching processes. This porous structure modifies the refractive index distribution to enable photonic bandgap guidance, achieving high bandwidth transmission while maintaining manufacturability through established porous material fabrication techniques.
2Loss of time
If hollow-core optical fiber structure is implemented, then latency and attenuation are reduced, but manufacturing complexity increases
Solution Approach 1:
The hollow core structure and microstructured cladding pattern are formed in the preform stage before fiber drawing. Laser drilling or etching of the periodic hole pattern is performed on the preform, which then maintains its structure during the drawing process. This preliminary action ensures the hollow core geometry is established early, simplifying the overall manufacturing process despite the added complexity.
Solution Approach 2:
The manufacturing process utilizes controlled parameter changes during fiber drawing, including temperature gradients and drawing speeds, to maintain the hollow core structure and microstructured cladding pattern. By adjusting these parameters, the fiber can be drawn from the preform while preserving the complex geometry, thereby reducing latency without making manufacture prohibitively difficult.
3Reliability
If microstructured cladding with periodic hole pattern is used, then optical energy guidance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The periodic hole pattern in the microstructured cladding is designed to self-align and self-organize during the fiber drawing process. The laser-drilled holes in the preform maintain their periodic arrangement as the fiber is drawn, with the drawing process itself helping to regularize the pattern. This self-service mechanism reduces the need for extremely high manufacturing precision while still achieving reliable optical energy guidance.
Solution Approach 2:
The manufacturing process employs controlled parameter changes, particularly in the laser drilling and etching stages, to create the periodic hole pattern with sufficient precision. By optimizing laser parameters (power, speed, focus) and preform temperature during drawing, the system achieves the necessary manufacturing precision for reliable optical guidance without requiring ultra-precise manufacturing tolerances.
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 hollow-core optical fiber enhances data transmission speed and distance capabilities by reducing latency and attenuation compared to solid-core fibers, while being compatible with existing communications equipment.
Implementation Method 1
the hollow-core optical fiber structure is configured to guide optical energy within the hollow core region by total internal reflection at an interface between the hollow core region, having a lower refractive index, and the microstructured cladding region, having a higher refractive index
Data Source
AI summary
The invention generally relates to optical fibers, and, more particularly, to hollow-core optical fibers and cables for use in high-speed data transmission, including transmission of telecommunications data, and methods of manufacturing such hollow-core optical fibers and cables.