Polymer Optical Fiber Tunable Overcladding
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Solution Overview
Problem
Polymer optical fibers face challenges in developing tunable glass transition temperature and thermal expansion properties, especially when using copolymeric core and/or cladding materials, and require a hydrolytically stable overcladding layer for long-term stability in varying environments.
Innovation Solution
A polymer optical fiber with an overcladding layer formed from a blend of two or more amorphous miscible polymers, such as polystyrene-poly(phenylene oxide) or Zeonex 5000 and Zeonex 480R, which allows for adjustable glass transition temperature and thermal expansion properties, enhancing mechanical strength and resistance to hydrolysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single polymer material is used for the overcladding layer, then the manufacturing process is simple, but the glass transition temperature and thermal expansion properties cannot be tuned to match different core and cladding materials
Solution Approach 1:
The patent applies composite materials by combining multiple polymers (e.g., cyclic olefin copolymer and polystyrene) to form a blended overcladding layer. This composite approach enables tuning of glass transition temperature and thermal expansion properties to match different core and cladding materials, while maintaining mechanical strength and hydrolytic stability. The blend ratio can be adjusted to achieve desired property matching without excessive complexity.
2Reliability
If perfluorinated polymers are used for the optical core and cladding to achieve high bandwidth and low attenuation, then optical performance is improved, but the cost increases significantly
Solution Approach 1:
The patent applies local quality by using perfluorinated polymers only where necessary (in the optical core and cladding layers) to achieve high bandwidth and low attenuation, while using more cost-effective polymers (e.g., cyclic olefin copolymer and polystyrene) for the overcladding layer. This localized application of expensive materials minimizes cost while maintaining optimal optical performance in the critical light-guiding regions.
3Strength
If the fiber diameter is increased to provide acceptable tensile properties for handling, then mechanical strength is improved, but the overall fiber size becomes larger
Solution Approach 1:
The patent applies composite materials by combining polymers with different mechanical properties in the overcladding layer. The cyclic olefin copolymer provides mechanical strength and tensile properties, while the polystyrene component contributes to hydrolytic stability and can be adjusted to control the overall fiber diameter. This composite approach enables achieving acceptable tensile properties at smaller fiber diameters compared to using a single polymer.
4Adaptability or versatility
If copolymeric core and cladding materials are used to optimize refractive index and glass transition temperature, then property optimization is achieved, but the development complexity increases
Solution Approach 1:
The patent applies parameter changes by adjusting the composition ratios of copolymeric core and cladding materials, as well as the blend ratios of polymers in the overcladding layer. By varying these parameters (monomer ratios, blend compositions), the glass transition temperature and refractive index can be optimized to match specific application requirements. This systematic parameter adjustment approach manages development complexity through structured material selection.
Data Source
AI summary
A polymer optical fiber is provided which shows improved hydrolytic stability. This fiber comprises a polymeric optical core and cladding layer, surrounded by a polymeric overcladding layer which comprises a miscible blend of one or more hydrolytically stable amorphous polymers. By varying the ratios of the component polymers in the overcladding blend, the glass transition temperature and the coefficient of thermal expansion of the overcladding layer may be tuned to optimize the attenuation and bandwidth of the plastic optical fiber.