Hollow-Core Optical Fiber Cladding Structure for Low Confinement Loss
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Solution Overview
Problem
Hollow-core optical fibers suffer from light loss along the length of the fiber, which impedes their practical implementation.
Innovation Solution
The hollow-core optical fiber design incorporates a tubular outer cladding with inner cladding members comprising concentric glass ring members, utilizing photonic bandgap, anti-resonant, and inhibited coupling mechanisms to confine light within the hollow core, reducing attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional anti-resonant hollow-core optical fibers with structural tubes are used, then light guidance through hollow core is achieved, but light loss from the hollow core along the length of the fiber occurs
Solution Approach 1:
The fiber structure is segmented into distinct functional zones: an inner cladding layer with anti-resonant elements (tubes or membranes) and an outer cladding layer. This segmentation allows the inner cladding to provide light confinement through anti-resonant effects while the outer cladding provides additional structural support and confinement, thereby reducing light loss along the fiber length.
Solution Approach 2:
The patent implements a nested structure where the inner cladding layer containing anti-resonant elements is positioned within the hollow core region, and the outer cladding layer surrounds the inner cladding. This nested arrangement creates multiple barriers for light confinement, with the inner cladding providing primary confinement and the outer cladding providing secondary confinement, significantly reducing light loss.
2Loss of energy
If hollow-core optical fibers are implemented, then reduced attenuation is achieved, but light loss along the length impedes practical implementation
Solution Approach 1:
The patent employs composite material structures combining different cladding layers with distinct optical properties. The inner cladding layer uses anti-resonant elements (glass tubes or membranes) while the outer cladding layer provides complementary confinement. This composite approach achieves ultra-low attenuation across broad wavelength ranges (800-2000 nm), making the fiber practically applicable for various optical communication and sensing applications.
Solution Approach 2:
The patent optimizes key structural parameters including the thickness of inner and outer cladding layers, the spacing and arrangement of anti-resonant elements, and the diameter of the hollow core. By carefully controlling these parameters, the fiber achieves low confinement loss across a broad wavelength range, enhancing practical applicability for different application scenarios.
3Reliability
If structural tubes are arranged in traditional anti-resonant hollow-core fibers, then light guidance is achieved, but confinement loss remains high
Solution Approach 1:
The patent introduces an outer cladding layer as an intermediary structure between the inner cladding with anti-resonant elements and the external environment. This outer cladding acts as an additional mediator for light confinement, working in conjunction with the inner cladding to reduce confinement loss. The outer cladding provides an extra barrier that prevents light from escaping, thereby reducing confinement loss while maintaining effective light guidance.
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 achieves single-mode propagation with confinement loss less than 10−2 dB/km and bending loss less than 1 dB/km over a wide wavelength range (800 nm to 2000 nm), enhancing the fiber's performance and practicality.
Implementation Method 1
utilizing photonic bandgap, anti-resonant, and inhibited coupling mechanisms to confine light within the hollow core
Implementation Method 2
utilizing photonic bandgap, anti-resonant, and inhibited coupling mechanisms to confine light within the hollow core
Implementation Method 3
utilizing photonic bandgap, anti-resonant, and inhibited coupling mechanisms to confine light within the hollow core
Data Source
AI summary
A hollow-core optical fiber that includes an outer cladding having a tubular shape with a hollow interior, a plurality of inner cladding members positioned with the hollow interior and a hollow core formed by the plurality of inner cladding members. The hollow-core optical fiber is configured to provide single-mode propagation of an optical signal within a wavelength range from 800 nm to 2000 nm.