Fiber Optic Cable Joining Sleeve for Downhole Integrity
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Solution Overview
Problem
Existing methods for joining fiber optic cables often risk damaging the optical fibers when joining exterior casings, and vice versa, particularly in harsh downhole environments where high temperatures and pressures can cause cable damage.
Innovation Solution
A method involving sliding a sleeve over a first fiber optic cable, joining the optical fibers of the first cable to those of a second cable, and then joining the sleeve to both exterior casings, while ensuring the sleeve's material and coupling features do not damage the fibers, and including testing for attenuation loss, mechanical strength, and pressure integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If exterior casings are joined first, then optical fibers can be protected from damage, but joining optical fibers becomes difficult
Solution Approach 1:
The joining process is divided into two independent stages: first joining the exterior casings using a sleeve and coupling features, then separately joining the optical fibers using splicing or connectorization. This segmentation allows each component to be joined independently without interfering with the other, resolving the contradiction between structural integrity and ease of fiber joining.
Solution Approach 2:
The exterior casings are joined in advance using the sleeve before the optical fibers are joined. This preliminary action provides structural support and protection for the subsequent fiber joining process, making it easier to handle and align the fibers without compromising structural integrity.
2Manufacturing precision
If optical fibers are joined first, then alignment can be achieved, but exterior casings may be damaged during joining
Solution Approach 1:
The exterior casings are joined using the sleeve in advance before the optical fibers are joined. This preliminary structural joining provides stable support and proper alignment for the subsequent fiber joining process, enabling precise alignment without risking damage to the casings during fiber manipulation.
Solution Approach 2:
The sleeve acts as an intermediary component that joins the exterior casings and provides a stable framework. This intermediary structure enables precise alignment of the optical fibers during splicing or connectorization without requiring direct manipulation of the fragile fibers that could damage the casings.
3Device complexity
If a single joining method is used for both casings and fibers, then process simplicity is achieved, but damage risk increases
Solution Approach 1:
The joining process is segmented into two distinct methods: mechanical joining (sleeve, adhesives, crimping) for exterior casings and optical joining (fusion splicing, mechanical splicing, connectorization) for optical fibers. This segmentation allows each component to be joined using the most appropriate method, reducing damage risk while maintaining acceptable process complexity through standardized procedures.
Data Source
AI summary
A method for joining fiber optic cables includes sliding a sleeve over a first fiber optic cable, joining a first set of optical fibers of the first fiber optic cable to a second set of optical fibers of a second fiber optic cable, sliding the sleeve over the first and second fiber optic cables, and joining the sleeve to a first exterior casing of the first fiber optic cable and to a second exterior casing of the second fiber optic cable.