Capillary-Isolated Hollow-Core Fiber Endcap for Heat-Safe Termination
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Solution Overview
Problem
Hollow-core optical fibers with structured cladding face issues in termination due to heat-induced damage and moisture ingress, which degrade their performance and structural integrity.
Innovation Solution
A termination method for hollow-core fibers involves inserting the fiber into a capillary, adhering it to the capillary at one end, and fusing an endcap to the capillary's end face, thereby avoiding direct heat exposure to the structured cladding and providing thermal isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the end of the hollow-core fiber is directly fused to the endcap, then the fiber termination is simple and strong, but the structured cladding is exposed to excessive heat that can melt or damage it
Solution Approach 1:
A capillary tube is introduced as an intermediary component between the hollow-core fiber and the endcap. The capillary serves as a thermal barrier that prevents excessive heat from reaching the structured cladding during the fusing process, while still allowing the termination to achieve sufficient mechanical strength through the capillary's structural support and adhesive bonding.
2Reliability
If the hollow-core fiber is left open at the end, then moisture ingress is prevented, but the fiber end is vulnerable to contamination and damage
Solution Approach 1:
The hollow-core fiber is inserted into and nested within the capillary tube, which itself is nested within the endcap structure. This nested arrangement provides multiple levels of protection: the capillary acts as a protective barrier against moisture and contamination, while the endcap provides additional structural protection, all without requiring complex external components.
3Ease of manufacture
If the structured cladding is exposed to the environment, then manufacturing is simpler, but moisture can ingress through the channels and degrade performance
Solution Approach 1:
The capillary tube serves as a protective intermediary that shields the structured cladding from direct environmental exposure. The capillary's walls act as a barrier that prevents moisture from ingress through the channels in the structured cladding, while the capillary itself can be manufactured using standard processes that do not significantly complicate the overall fabrication.
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
This method effectively protects the hollow-core fiber's structured cladding from damage and moisture, maintaining its light-guiding properties while extending the benefits of an endcap to hollow-core fibers.
Implementation Method 1
fusing an endcap to the capillary's end face
Implementation Method 2
adhering it to the capillary at one end
Data Source
AI summary
A terminated hollow-core optical fiber includes a capillary, a hollow-core optical fiber including a structured cladding, and an endcap. A first end of the hollow-core optical fiber terminates inside the capillary a non-zero distance away from a first end face of the capillary. The hollow-core optical fiber is adhered to the capillary at a second end face of the capillary where the hollow-core optical fiber extends out of the capillary. The endcap is fused to the first end face of the capillary. The endcap has a larger diameter than the first end of the hollow-core optical fiber. This termination scheme does not require fusing the hollow-core fiber itself to the endcap or any other part. Therefore, this termination scheme is applicable to hollow-core fibers with a structured cladding that cannot tolerate the temperatures associated with fusing the hollow-core fiber to another part.