Plastic Optical Fiber Design for Low-BER Short-Distance Links
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Solution Overview
Problem
Conventional plastic optical fibers with an M2 value of 1.7 or more struggle to achieve low bit error rates (BER) in short-distance signal transmission, indicating a need for improved transmission quality.
Innovation Solution
A plastic optical fiber design with a length of 30 m or less, core diameter of 30 μm to 100 μm, transmission loss of 70 dB/km to 500 dB/km, and transmission band of 30 MHz·km to 600 MHz·km at 850 nm, utilizing a graded-index structure and fluorine-containing resins to enhance signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the M2 value is increased to 1.7 or more to reduce noise, then noise reduction is achieved, but the bit error rate (BER) remains high and transmission quality is insufficient
Solution Approach 1:
The patent changes the physical parameters of the optical fiber by specifying a length of 100m or less and a core diameter of 10μm or more. These parameter changes, combined with controlling transmission loss and transmission band within specific ranges, achieve both noise reduction and low BER, resolving the contradiction between noise reduction and transmission quality
Solution Approach 2:
The patent uses composite resin materials for the core and cladding with specifically controlled refractive indices. The core uses resin A with refractive index 1.39≤n1<1.47 and cladding uses resin B with 1.37≤n2<1.45, creating a optimized refractive index difference that simultaneously reduces noise and achieves low BER for high-quality transmission
2Loss of energy
If the core diameter is increased to improve light transmission, then transmission loss is reduced, but the transmission band may be affected
Solution Approach 1:
The patent optimizes the core diameter parameter to 10μm or more, which balances light transmission efficiency and transmission band. Combined with length control (100m or less) and refractive index optimization, this parameter change achieves both low transmission loss (50-200 dB/km) and adequate transmission band (20-100 MHz·km), resolving the contradiction between transmission loss and transmission band
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 proposed design achieves a low BER of 1×10−7 or less, significantly improving transmission quality in short-distance signal transmission.
Implementation Method 1
The cladding is made of a resin material having a lower refractive index than that of the resin material of the core so that light will stay within the core
Data Source
AI summary
A plastic optical fiber 10 of the present disclosure includes: a core 11; and a cladding 12 disposed on an outer circumference of the core 11. The plastic optical fiber 10 has a length of 30 m or less. The core 11 has a diameter of 30 μm or more and 100 μm or less. Of the plastic optical fiber 10, a transmission loss at a wavelength of 850 nm is 70 dB/km or more and 500 dB/km or less, and a transmission band at a wavelength of 850 nm is 30 MHz·km or more and 600 MHz·km or less.