Single Mode Fiber Categorization for 850 nm Data Centers
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Solution Overview
Problem
Standard single mode optical fibers are not suitable for short optical links in hyperscale data centers due to their low modal bandwidth at 850 nm, leading to inefficient light coupling from multimode VCSELs and compromised transmission performance.
Innovation Solution
Categorizing single mode optical fibers based on their peak bandwidth wavelength, using properties such as centerline dip radius, depth, alpha value, core radius, mode field diameter, and zero dispersion wavelength to determine if they meet a target modal bandwidth, optimizing them for high data rate transmission at 850 nm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If standard single mode optical fibers are used for short optical links, then fiber cable management is simplified, but optical transmission performance deteriorates due to low modal bandwidth at 850 nm
Solution Approach 1:
The patent changes the refractive index profile parameters of the single mode optical fiber, specifically introducing a centerline dip with optimized radius (0.05-0.15 microns) and depth (0.005-0.02), and optimizing the alpha value (1.8-2.5) to achieve peak modal bandwidth at 850 nm while maintaining single mode operation at 1310 nm
2Ease of operation
If standard single mode optical fibers are used, then cable management is simplified, but light coupling efficiency from multimode VCSELs deteriorates
Solution Approach 1:
The patent modifies the core radius (8.5-10.5 microns) and refractive index profile parameters including centerline dip characteristics to optimize the mode field diameter and numerical aperture, enabling better mode field matching between multimode VCSELs and single mode fibers for improved coupling efficiency
3Reliability
If single mode VCSELs are used with optimized single mode fibers, then transmission performance improves, but the requirement for specific fiber properties increases complexity
Solution Approach 1:
The patent establishes specific parameter ranges for fiber properties (centerline dip radius 0.05-0.15 microns, depth 0.005-0.02, alpha value 1.8-2.5, core radius 8.5-10.5 microns) that guarantee peak modal bandwidth at 850 nm, providing a standardized specification that simplifies selection and deployment
Solution Approach 2:
The patent provides a methodology to calculate and determine peak bandwidth wavelength during fiber manufacturing and characterization, allowing fibers to be pre-categorized and selected based on their suitability for 850 nm operation before deployment
Data Source
AI summary
A method of categorizing single mode optical fibers, the method including determining one or more fiber properties of an optical fiber, the optical fiber being a single mode optical fiber at an operating wavelength of about 1310 nm. The method further including calculating a peak bandwidth wavelength of the optical fiber based on the one or more fiber properties, comparing the calculated peak bandwidth wavelength with a target peak bandwidth wavelength and based on the comparison, determining if the optical fiber meets a target modal bandwidth.