Multimode Fiber Screening by Modal Bandwidth for Higher OM Standards
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Solution Overview
Problem
Multimode optical fibers used in short-reach, high-data networks are not optimized for achieving the performance levels of single mode fibers, leading to inefficient use of resources and higher costs due to the need for additional components like lasers, splices, and connectors.
Innovation Solution
A method to select and categorize multimode optical fibers based on effective modal bandwidth at different wavelengths, allowing them to meet the requirements of higher OM standards (e.g., OM4 or OM5) by evaluating their performance at both short and long wavelengths using a screening process and threshold criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single mode optical fibers are used to achieve higher data rates and transmission lengths, then network performance is improved, but network cost increases due to additional components like lasers, splices, and connectors
Solution Approach 1:
The patent applies parameter changes by evaluating multimode fibers at multiple wavelengths (850 nm, 910 nm, 953 nm) to identify fibers with optimized characteristics. By measuring effective modal bandwidth across different wavelengths and comparing against calculated thresholds, the method transforms standard multimode fibers into optimized variants that can achieve single-mode-like performance at short reach distances without requiring single-mode infrastructure
2Device complexity
If multimode optical fibers are used to reduce network cost, then device complexity is reduced, but data transmission performance deteriorates compared to single mode fibers
Solution Approach 1:
The patent implements preliminary action by performing multi-wavelength measurements and calculations on multimode fibers during the selection and deployment phase. The method calculates threshold effective modal bandwidth values based on wavelength-specific formulas and compares measured fiber performance against these thresholds, enabling early identification of optimized fibers before network deployment. This preliminary characterization ensures that only fibers meeting the required performance criteria are selected, eliminating the need for subsequent network upgrades
3Productivity
If standard multimode fibers are deployed without wavelength-specific optimization, then deployment speed is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by implementing a wavelength-specific optimization process that measures effective modal bandwidth at 850 nm, 910 nm, and 953 nm before network deployment. The method calculates threshold values using wavelength-specific formulas and identifies optimized fibers in advance, ensuring that deployed fibers meet performance requirements without requiring subsequent upgrades or replacements, thereby improving long-term resource utilization efficiency
Solution Approach 2:
The patent replaces physical fiber upgrades or replacements with a measurement and selection-based approach. Instead of deploying all fibers uniformly and then physically upgrading underperforming ones, the method uses optical measurements and calculations to identify and select optimized fibers from the existing batch, substituting mechanical intervention with optical characterization and data-driven selection
Data Source
AI summary
A method of categorizing a group of multimode optical fibers, the method including comparing an effective modal bandwidth of a first multimode optical fiber with a first threshold, the first multimode optical fiber being in a group of multimode optical fibers meeting a first OM-standard and the first threshold being an effective modal bandwidth of the first multimode optical fiber. The method further including categorizing the first multimode optical fiber as meeting OM functional requirements of a second OM-standard if the effective modal bandwidth of the first multimode optical fiber is equal to or above the first threshold, wherein the second OM-standard is higher than the first OM-standard.