Optical Fiber Cable Trench Cladding for Compact High-Density Design
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Solution Overview
Problem
Existing optical fiber cables face challenges in reducing size while maintaining performance, particularly in high-density packaging and efficient data transmission within limited physical space, due to issues like attenuation and micro-bending losses.
Innovation Solution
The optical fiber cable design features a core with a specific refractive index profile and cladding layers, including trench regions, to achieve ultra-low bend loss and increased fill factor, allowing for a compact diameter while maintaining signal integrity and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the diameter of optical fiber cable is reduced to increase space utilization, then the cable size is decreased, but the signal transmission performance deteriorates due to increased attenuation and micro-bending losses
Solution Approach 1:
The patent applies local quality by creating a trench region with a different refractive index profile specifically in the cladding layer. This localized structural modification allows the fiber to maintain low bend loss and high signal transmission performance while achieving a reduced overall cable diameter, thus resolving the contradiction between compact size and signal quality.
Solution Approach 2:
The patent changes the refractive index parameter in the cladding layer by introducing a trench region with a lower refractive index. This parameter change enables the fiber to reduce macro-bending losses and maintain signal integrity at smaller diameters, allowing compact cable design without compromising transmission performance.
2Reliability
If the effective area of the fiber is increased to reduce fiber nonlinearity, then the transmission performance is improved, but the cable diameter increases
Solution Approach 1:
The patent maintains a reduced cable diameter while improving transmission performance by locally modifying the cladding layer with a trench region. This localized structural change allows for optimized light confinement and reduced nonlinearity without requiring an increase in the overall fiber effective area, thus resolving the contradiction between transmission performance and cable size.
3Reliability
If the outer cladding layer is optimized to compensate for low OCT and reduce crosstalk, then the inter-core performance is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent introduces a trench region in the cladding layer with a specific refractive index profile to compensate for low OCT and reduce crosstalk. This localized modification provides a systematic approach to improving inter-core performance while maintaining manufacturing feasibility through a well-defined structural feature that can be integrated into standard fiber fabrication processes.
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 design enables high-density packaging with reduced macro-bending losses, improved data transmission capacity, and enhanced optical performance, facilitating efficient data transmission in confined spaces without compromising signal quality.
Implementation Method 1
The optical fiber comprises a core and a cladding having at least one trench region such that a trench relative refractive index (Δ2) is minimum near center of the trench
Implementation Method 2
the refractive index profile of the second cladding layer comprises at least one trench region such that a trench relative refractive index (Δ2) of the at least one trench region decreases gradually from an outer boundary of the first cladding layer to a trench center
Data Source
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AI summary
Disclosed is an optical fiber cable (100) comprising a central strength member (CSM) (104), a plurality of buffer tubes (106), and a sheath (114). In particular, the plurality of buffer tubes (106) are stranded around the CSM (104) such that each buffer tube encloses optical fibers (116) with one or more protective coating layers (306) having a combined thickness of less than 30 micrometer (µm). Moreover, the plurality of buffer tubes (106) are stranded in at-least two concentric layers around the CSM (104). Further, the sheath (114) surrounds the CSM (104) and the plurality of buffer tubes (106). The optical fiber cable (100) has a fill factor of greater than 7 fibers/millimeter square (f/mm2).