Optical Fiber Junction Box Segmented Reservoir
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Solution Overview
Problem
Existing connection devices for optical fibers are complex to assemble and risk damaging the sensitive fibers during installation, especially when mounted in buildings or within installation ducts, due to the mechanical stress and bending requirements of fiber optic cables.
Innovation Solution
A connection box design with a spatially separated cable reservoir and splice cassette, where the cable reservoir is movably mounted relative to the splice cassette, allowing for safe storage and protection of excess fiber lengths and splices, and enabling non-destructive, tool-free connection of optical fibers with a plug connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fiber optic cables are laid and connected to junction boxes, then optical transmission is achieved, but the risk of fiber damage increases due to mechanical stress and bending requirements
Solution Approach 1:
The junction box is divided into functionally independent compartments: a cable reservoir for storing excess cable length and a splice cassette for protecting spliced fibers. This segmentation isolates the fragile spliced fibers from the mechanical stress of cable handling and routing, allowing each compartment to optimize its protection strategy independently.
Solution Approach 2:
The splice cassette is nested within the junction box structure, providing a secondary protective layer around the spliced fibers. The cable reservoir and splice cassette are arranged concentrically or adjacently within the same housing, creating nested protection zones where the inner splice area is shielded from outer cable handling stresses.
2Reliability
If splicing is performed to connect fiber optic cables to pigtails, then optical connectivity is achieved, but assembly complexity increases
Solution Approach 1:
Pigtails are pre-assembled with connectors on one end before arrival at the junction box. This preliminary preparation separates the complex splicing operation from the final installation, allowing splicing to be performed in a controlled, protected environment within the splice cassette while the connector end is already ready for immediate connection to network equipment.
Solution Approach 2:
The splice cassette acts as an intermediary structure that facilitates the connection between fiber optic cables and pigtails. It provides a dedicated workspace with proper alignment features, protection during the splicing process, and organized routing paths, thereby simplifying what would otherwise be a complex field splicing operation.
3Adaptability or versatility
If excess fiber lengths are stored in the junction box, then flexibility for different cable lengths is achieved, but the risk of fiber damage increases
Solution Approach 1:
The junction box separates excess cable storage from spliced fiber protection through distinct compartments. The cable reservoir accommodates varying excess lengths of both cable and individual fibers in a dedicated space with appropriate bending radius provisions, while the splice cassette protects the spliced connections from these stored excess lengths, preventing tangling and damage.
4Adaptability or versatility
If junction boxes are designed for wall mounting, then installation flexibility is improved, but assembly complexity and fiber damage risk increase
Solution Approach 1:
The junction box is designed as a modular wall-mounted unit with integrated mounting brackets and a compact form factor. The segmented internal structure (cable reservoir and splice cassette) is arranged to fit within standard wall cavity dimensions, allowing installation during construction or renovation without requiring complex external mounting structures or lengthy assembly procedures.
Data Source
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AI summary
A junction box (100) for optical fibers, in particular in the form of a flush-mounted box, contains: a) a cable reservoir (200) for storing different excess lengths of an optical fiber connection cable (600), b) a splice cassette (300) comprising a splice receptacle (800) for one or more splices (810) and comprising a fiber receptacle (320a, 320b, 320c, 320d) for storing different excess lengths of individual optical fibers and/or for storing different lengths of unused optical fibers, e.g.from an unused spare pigtail, c) A holder (400a, 400b) for receiving a connection device (500a, 500b) for connecting an optical conductor (30) to the junction box (100), wherein cable reservoir (200) and splice cassette (300) are located in spatially separate areas and wherein the cable reservoir (200) is movably mounted relative to the splice cassette (300) so that the splice cassette (300) can be closed with the cable reservoir (200).