Amplifying Fiber Segmentation for Bend Distortion Mitigation
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Solution Overview
Problem
Conventional optical amplification fiber assemblies prioritize packaging and bend-induced losses over mode distortion, leading to performance limitations in optical devices due to bend distortion, especially in high-power applications where modefield distortion and nonlinearity become significant.
Innovation Solution
The method involves selectively unbending critical portions of the amplification fiber to mitigate modefield distortion while maintaining a compact package size by coiling less susceptible portions, thereby optimizing the refractive index profile and curvature to reduce nonlinear impairments and energy extraction issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the amplification fiber is coiled to provide compact packaging, then the device size is reduced, but modefield distortion and nonlinear impairments increase
Solution Approach 1:
The amplification fiber is divided into multiple sections with different curvature radii. A first section has a first curvature radius that causes less modefield distortion, while a second section has a second curvature radius that enables compact packaging. This segmentation allows different parts of the fiber to serve different functions: maintaining mode quality in critical sections while achieving compact overall device size through coiled sections.
2Volume of moving object
If the bend radius is reduced to achieve compact packaging, then the device size is reduced, but bend-induced losses and mode distortion increase
Solution Approach 1:
Different sections of the amplification fiber are assigned different local curvature properties. Sections where the fiber is subjected to bending are designed with specific curvature radii that balance compact packaging requirements against bend-induced losses and mode distortion. This local differentiation of curvature quality allows the fiber to maintain optimal performance in critical sections while achieving compact overall dimensions.
3Reliability
If the amplification fiber is bent to remove unwanted modes, then mode filtering is improved, but signal light losses and modefield distortion increase
Solution Approach 1:
The fiber is segmented into sections with different curvature radii, where certain sections are optimized for mode filtering while others are optimized for signal transmission. By placing mode-filtering bends in specific locations and using appropriate curvature radii, the system can effectively remove unwanted modes while minimizing signal light losses and modefield distortion in other critical sections.
Data Source
Figure 1A~2B
Figure 3
Figure 4A
AI summary
A method of producing an optical amplifying assembly includes providing an amplifying fiber and selecting a first portion and a second portion of the amplifying fiber such that a bend of substantially the same radius and length would cause greater distortion impairments in the first portion than in second portion. The method further includes coiling the second portion and arranging the first portion to mitigate the impairments due to bend distortion.