Optical Fiber Selection Using DMD Peak Wavelengths
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Solution Overview
Problem
The challenge lies in selecting multimode optical fibers that meet bandwidth requirements at different wavelengths, as existing methods struggle to accurately determine which fibers from a set of supposedly like fibers can satisfy bandwidth conditions at both short and target wavelengths, such as 850 nm and 950 nm, due to manufacturing variations and lack of specification at these wavelengths.
Innovation Solution
A method involving differential mode delay (DMD) measurement data at a short wavelength to determine peak wavelengths and calculate target-wavelength bandwidth, allowing for the identification of fibers that meet specific bandwidth requirements by establishing a peak wavelength threshold and comparing calculated target-wavelength bandwidth to the requirement, ensuring fibers meet both short-wavelength and target-wavelength criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fibers are selected based on manufacturer measurements at a single wavelength, then selection process is simple, but accuracy of meeting bandwidth requirements at different wavelengths deteriorates
Solution Approach 1:
The patent performs preliminary DMD measurements at a short wavelength (e.g., 850 nm) to determine peak wavelength and calculate target-wavelength bandwidth before final fiber selection. This preliminary characterization enables accurate prediction of fiber performance at target wavelengths without requiring exhaustive measurements at every operating wavelength, thus resolving the contradiction between selection simplicity and verification accuracy.
2Measurement precision
If DMD measurements are performed at multiple wavelengths to ensure bandwidth requirements, then measurement accuracy improves, but measurement time and complexity increase
Solution Approach 1:
The patent extracts the essential fiber characteristic (peak wavelength from DMD data) that enables prediction of bandwidth performance at target wavelengths. By measuring only at a short wavelength to obtain this extracted parameter, the method avoids time-consuming measurements at multiple wavelengths while maintaining measurement precision through the calculated target-wavelength bandwidth metric.
Solution Approach 2:
The patent transforms the measurement approach by changing from direct bandwidth measurement at target wavelengths to calculating target-wavelength bandwidth from short-wavelength DMD data. This parameter transformation uses the relationship between peak wavelength and bandwidth characteristics to predict performance at different wavelengths, significantly reducing measurement time while maintaining accuracy.
3Reliability
If all fibers in a set are tested at target wavelength to ensure compliance, then reliability of fiber selection improves, but productivity decreases
Solution Approach 1:
The patent performs preliminary filtering using short-wavelength DMD measurements to identify fibers with peak wavelengths that indicate compliance with target-wavelength bandwidth requirements. This preliminary action reliably screens out non-compliant fibers without requiring exhaustive target-wavelength testing of all fibers, thus maintaining selection reliability while improving throughput by testing only candidate fibers at the target wavelength.
Data Source
AI summary
Methods of selecting, from a set of like optical fibers, a subset of optical fibers that can meet both short-wavelength and target-wavelength bandwidth requirements are disclosed. The method includes obtaining short-wavelength bandwidth data from DMD measurements, and determining a peak wavelength for each optical fiber. A target-wavelength bandwidth is then calculated using the determined peak wavelengths. The calculated target bandwidth is then compared to the short-wavelength and target-wavelength bandwidth requirements to identify which of the optical fibers satisfy these requirements.