Optical Fiber Core-Cladding Concentricity Error Measurement
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Solution Overview
Problem
Current methods for measuring core-cladding concentricity error (CCCE) in optical fibers are inaccurate, labor-intensive, and require complex preparation procedures, often providing single-point measurements that do not represent the fiber's overall mode-field distribution, which is critical for maintaining optical fiber quality and reducing nonlinear impairments in long-distance transmission.
Innovation Solution
The method employs guided acoustic-wave Brillouin scattering (GAWBS) to measure the optical mode-field distribution within the fiber, providing an average characterization along the fiber length without the need for complicated preparation procedures, as light remains inside the fiber, allowing for more accurate representation and measurement of CCCE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If prior art measurement methods are used, then measurement can be performed, but the measurement is inaccurate and provides single-point data that does not represent the fiber's overall mode-field distribution
Solution Approach 1:
The patent transitions from single-point measurement to distributed measurement along the fiber length. By using GAWBS, the measurement probes the mode-field distribution at multiple positions along the fiber, converting a zero-dimensional point measurement into a one-dimensional distributed characterization, thereby capturing the overall fiber properties rather than just local anomalies.
Solution Approach 2:
The patent uses GAWBS to create an optical copy of the mode-field distribution within the fiber. The guided acoustic waves interact with the optical modes to produce a measurable signal that replicates the spatial distribution characteristics of the optical field, allowing indirect but accurate measurement of the mode-field distribution without direct interference.
2Measurement precision
If prior art measurement methods are used, then measurement can be performed, but complicated fiber preparation procedures are required
Solution Approach 1:
The fiber itself serves as the measurement medium. The GAWBS technique utilizes the fiber's own optical modes and acoustic wave interactions to perform the measurement, eliminating the need for external preparation procedures such as fiber cleaving, coating removal, or mounting in specialized fixtures. The fiber structure itself provides the necessary optical pathways for measurement.
3Measurement precision
If light is allowed to remain inside the optical fiber during measurement, then accurate mode-field distribution measurement is achieved, but the measurement system becomes more complex
Solution Approach 1:
The patent introduces guided acoustic waves as an intermediary between the optical modes and the measurement system. The acoustic waves modulate the optical field, creating sidebands that carry information about the mode-field distribution. This intermediary mechanism allows the measurement system to probe the optical modes without directly interfering with or disrupting the light propagation, simplifying the overall system architecture.
4Ease of operation
If single-point measurement is used, then measurement procedure is simple, but the measurement does not provide average characterization along the fiber length
Solution Approach 1:
The GAWBS measurement maintains continuous interaction along the fiber length, with the acoustic waves and optical modes co-propagating through the entire fiber. This continuous interaction enables simultaneous measurement at multiple positions, providing an average characterization of the mode-field distribution along the entire fiber length rather than isolated point data, while maintaining a simple and continuous measurement process.
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
This approach offers a more accurate and efficient measurement of CCCE, reducing splicing losses and connector losses, and enabling better characterization of optical fibers, particularly in submarine transmission systems, by providing average effective area measurements along the entire transmission length.
Implementation Method 1
measuring a seemingly unrelated property of fibers called guided acoustic wave Brillouin scattering (GAWBS)... by analyzing this property we advantageously determine what level of CCCE is exhibited by the optical fiber
Data Source
AI summary
Aspects of the present disclosure describe estimating/measuring core-cladding concentricity error in optical fibers. In sharp contrast to the prior art, our inventive method is based on measuring a seemingly unrelated property of fibers called guided acoustic wave Brillouin scattering (GAWBS). As we shall show and describe, by analyzing this GAWBS property we advantageously determine what level of CCCE is exhibited by the optical fiber.