Hollow Core Fiber Fusion Splicing With Offset Arc Heating
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Solution Overview
Problem
Existing fusion splicers fail to efficiently connect unique optical fibers like hollow core fibers and photonic bandgap fibers without causing light leakage or reduced fusion strength due to melting issues at the internal fine structures or outer peripheries.
Innovation Solution
A fusion splicer design with offset electrode tips and rotational control to selectively melt the outer peripheries of optical fibers, allowing for complete circumference fusion without melting the internal structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a high heating temperature is applied to fuse optical fibers, then the fusion strength is improved, but the internal fine structure melts and disappears causing light leakage
Solution Approach 1:
The patent applies local quality by using offset electrodes to concentrate heating at specific locations on the outer periphery of the optical fiber while avoiding the central region. The electrode arrangement creates localized high temperature zones that melt only the outer glass layer, preserving the internal hollow core structure and preventing light leakage while achieving sufficient fusion strength at the melted interfaces.
Solution Approach 2:
The patent employs asymmetry by positioning the electrode tips at offset locations relative to the optical fiber axis rather than symmetrically aligned with the fiber center. This asymmetric electrode placement ensures that the arc heating is concentrated on the outer periphery and not uniformly distributed, thereby protecting the internal fine structure from melting while still achieving adequate fusion of the outer layers.
2Object-affected harmful factors
If the heating temperature is reduced to protect internal structure, then light leakage is prevented, but the outer periphery does not melt sufficiently decreasing fusion strength
Solution Approach 1:
The offset electrode configuration creates localized heating zones that concentrate thermal energy precisely where it is needed - on the outer periphery - while leaving the internal structure cooler. This local quality approach allows the outer glass to melt sufficiently for strong fusion without excessive heat reaching the internal hollow core, thus maintaining both fusion strength and structural integrity.
Solution Approach 2:
The patent transitions from uniform volumetric heating to surface-focused heating by using offset electrodes positioned in specific spatial relationships with the fiber. This dimensional shift in heating distribution allows the outer periphery to be heated intensively for melting while the internal regions remain at lower temperatures, solving the contradiction between fusion strength and structural preservation.
3Device complexity
If conventional fusion method is used, then simple structure is maintained, but unique optical fibers with hollow core cannot be fused without melting internal fine structure
Solution Approach 1:
The patent extends the asymmetry principle to accommodate unique optical fiber structures by allowing flexible adjustment of electrode positions relative to the fiber axis. This asymmetric, adjustable electrode configuration can be adapted to different fiber types including hollow core fibers, photonic bandgap fibers, and other unique structures, maintaining device simplicity while achieving versatility through parameter adjustment rather than structural complexity.
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
Ensures strong and reliable connections of unique optical fibers by selectively melting the outer peripheries, maintaining the integrity of internal structures and reducing misalignment effects.
Implementation Method 1
a high voltage is applied across tips of the electrodes so as to generate air discharge for fusing the optical fibers together
Implementation Method 2
The arc generated between the electrodes can selectively melt outer periphery portions of the optical fibers
Data Source
AI summary
A pair of electrodes are disposed in a direction substantially perpendicular to an opposing direction of a pair of optical fibers. The pair of electrodes are disposed so as to oppose each other on a fusion part where tips of the optical fibers are butted and fused together, and a hollow core fiber is positioned between the electrodes. By applying a prescribed voltage across the electrodes, an arc is generated in a straight line connecting the tips of the pair of electrodes. At such time, the axial center connecting the tips of the pair of electrodes is offset relative to the axial center of the hollow core fiber held by an optical fiber holding part. In a state where the arc is formed by applying a voltage across the electrodes, a control unit can rotate a pair of holder mounting parts about the axis of the hollow core fiber and in the same direction at a predetermined speed.