Low-Loss Hollow-Core Antiresonant Fiber with Segmented Cladding
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Solution Overview
Problem
Current designs of hollow-core antiresonant fibers lack low-loss solutions, leading to high transmission losses and light leakage.
Innovation Solution
A low-loss hollow-core antiresonant fiber structure featuring a hollow-core area surrounded by uniformly distributed closed cavities with specific thin wall configurations, including fan-shaped or circular outermost walls and annular thin-walled spacers, which suppress light leakage through antiresonance principles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional hollow-core antiresonant fiber designs are used, then the fiber structure is relatively simple, but the transmission loss is high due to light leakage
Solution Approach 1:
The fiber structure is segmented into multiple functional regions: a hollow core region, multiple annular cladding layers with different wall thicknesses, and an outer coating layer. Each segment serves a specific function in controlling light propagation and reducing loss, transforming a simple hollow tube into a multi-layered structured fiber that achieves ultra-low transmission loss through coordinated design of each segment
Solution Approach 2:
Different cladding layers are designed with locally optimized properties: the first annular cladding layer has a thicker wall to provide strong antiresonant reflection, while the second annular cladding layer has a thinner wall to reduce overall loss. This local differentiation of wall thicknesses allows each region to contribute optimally to the overall performance, achieving ultra-low transmission loss without excessive complexity
2Reliability
If the wall thickness of cladding layers is increased to suppress light leakage, then light confinement improves, but transmission loss increases due to higher scattering and absorption
Solution Approach 1:
The cladding structure is divided into multiple annular layers with different wall thicknesses rather than using a single thick wall. The first annular cladding layer with greater wall thickness provides strong light confinement through antiresonant reflection, while the second annular cladding layer with smaller wall thickness reduces scattering and absorption losses, achieving both reliable light confinement and low transmission loss through segmented design
Solution Approach 2:
The fiber employs a composite structure combining multiple materials and geometries: the hollow core may be filled with gas or vacuum, the cladding layers use dielectric materials with different properties, and the layers are arranged in specific geometric configurations. This composite approach allows optimization of both light confinement and loss characteristics that cannot be achieved with a single homogeneous structure
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 fiber achieves ultra-low transmission loss, with losses less than 0.1 dB/km, by reducing light leakage and maintaining a simple overall structure.
Implementation Method 1
the principle of antiresonance is to enhance the reflection of grazing incident light when meeting a thin wall of a cladding, so as to constrain the light in a waveguide core as much as possible
Implementation Method 2
enhance the reflection of grazing incident light when meeting a thin wall of a cladding
Implementation Method 3
The hollow-core antiresonant fiber has the help of local coherence cancellation in a light field of a cladding area, so the overlap degree of a mode field and different dielectric inter-layers is lower
Data Source
AI summary
Disclosed is an ultralow loss hollow-core antiresonant fiber, which includes an outer layer structure, a hollow-core area and a plurality of closed cavities. The radial section of the inner surface of the outer layer structure is a circle with a first radius. In the circumferential direction of the inner surface of the outer layer structure, the plurality of the closed cavities are spaced from one another and are distributed uniformly and circumferentially. Each closed cavity includes: an outermost wall serving as a first thin wall, and the radial section of the outermost wall is a fan shape or a circle with a second radius. Each closed cavity further includes: second thin walls located in the inner space surrounded by the inner surface of the outermost wall, and the end surfaces of the second thin walls are annular thin-walled structures with thin-walled spacers arranged in the centers.