Breakout Cable Polymer Sheath Thickness for Bend Resistance
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Solution Overview
Problem
Conventional micromodule cables are inadequate for data centers due to lack of robustness, inability to bend around corners without attenuation, and failure to meet burn specifications like plenum-ratings, and have flimsy subunit materials that offer minimal protection for optical fibers.
Innovation Solution
A breakout cable design featuring a polymer sheath with a thickness of 0.2 mm to 0.3 mm surrounding bend-resistant optical fibers, allowing for robustness, hand accessibility, and compliance with plenum burn requirements, using a PVC jacket and graded-index glass core fibers with a depressed-index cladding, and a method to calculate jacket thickness for optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the polymer sheath thickness is increased to provide robustness and protection for optical fibers, then the mechanical strength and durability improve, but the ease of hand access to optical waveguides deteriorates
Solution Approach 1:
The polymer sheath is designed with non-uniform thickness, being thicker (0.2-0.3 mm) in regions requiring mechanical protection and thinner in regions requiring hand access, allowing simultaneous achievement of robustness and accessibility
Solution Approach 2:
The patent specifies a precise thickness range (0.2-0.3 mm) for the polymer sheath, optimizing the balance between mechanical strength and hand accessibility by controlling the dimensional parameter within this specific range
2Device complexity
If conventional flimsy subunit materials are used to reduce cable complexity, then the device complexity decreases, but the reliability and protection for optical fibers deteriorates
Solution Approach 1:
The patent employs composite material structures including polymer sheaths, PVC jackets, and graded-index glass core fibers with depressed-index cladding, combining multiple materials to achieve both simplicity and high reliability in fiber protection
3Adaptability or versatility
If the cable is designed to bend around corners with tight radii, then the adaptability to data center layouts improves, but the optical signal attenuation increases
Solution Approach 1:
The patent uses graded-index glass core fibers with specific refractive index profiles and depressed-index cladding, optimizing optical parameters to minimize bend-induced attenuation while maintaining adaptability to tight corner bends in data center environments
4Reliability
If thicker polymer sheath is used to meet plenum burn specifications, then the fire safety compliance improves, but the ease of hand tearing for access deteriorates
Solution Approach 1:
The polymer sheath is designed with thickness variation, being thicker in fire-critical zones to meet plenum ratings while maintaining thinner sections that allow easy hand tearing for fiber access, achieving both safety compliance and operational ease
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
The solution provides low attenuation under corner bends, meets plenum burn specifications, and allows for easy access to optical waveguides, enhancing the cable's durability and performance in data center applications.
Implementation Method 1
The core region is a graded-index glass core region, where the refractive index of the core region has a profile having a parabolic or substantially curved shape
Implementation Method 2
The cladding includes a first annular portion having a lesser refractive index relative to a second annular portion of the cladding
Data Source
AI summary
A breakout cable includes a polymer jacket and a plurality of micromodules enclosed within the jacket. Each micromodule has a plurality of bend resistant optical fibers and a polymer sheath comprising PVC surrounding the bend resistant optical fibers. Each of the plurality of bend resistant optical fibers is a multimode optical fiber including a glass cladding region surrounding and directly adjacent to a glass core region. The core region is a graded-index glass core region, where the refractive index of the core region has a profile having a parabolic or substantially curved shape. The cladding includes a first annular portion having a lesser refractive index relative to a second annular portion of the cladding. The first annular portion is interior to the second annular portion. The cladding is surrounded by a low modulus primary coating and a high modulus secondary coating.