A multi-clad active optical fiber and its fabrication method

By designing a multi-layered recessed cladding and a non-circular pump cladding, the problem of simultaneously optimizing Raman suppression ratio and beam quality in active optical fibers in existing technologies has been solved, achieving efficient beam transmission and system reliability in high-power optical fibers.

CN119496021BActive Publication Date: 2026-06-02CHANGFEI GUANGFANG (WUHAN) TECH CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
CHANGFEI GUANGFANG (WUHAN) TECH CO LTD
Filing Date
2024-11-06
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing double-clad active fibers have difficulty simultaneously optimizing Raman suppression ratio and beam quality, especially at high power levels where it is difficult to maintain both high Raman ratio and beam quality.

Method used

A multi-layered depressed cladding design is adopted, including an inner and outer depressed cladding, combined with a non-circular pump cladding. Through mode perturbation and mode separation, the fundamental mode energy ratio and core absorption efficiency are improved, and the Raman suppression ratio and beam quality are optimized.

Benefits of technology

This approach achieves simultaneous optimization of Raman suppression ratio and beam quality at high power, thereby improving the output power of the fiber and the reliability of the system.

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Abstract

This invention discloses a multi-clad active optical fiber and its fabrication method. The optical fiber comprises a rare-earth ion-doped core and a non-circular pump cladding in its glass portion. The pump cladding includes at least two low-refractive-index depressed cladding layers, wherein the innermost depressed cladding closest to the core is the inner depressed cladding, and the outermost lower-limit cladding is the outer depressed cladding. The NA range of the outer side of the inner depressed cladding is 0-0.164; the NA range of the inner side of the outer depressed cladding is also 0-0.164. The multi-clad active optical fiber provided by this invention enhances mode disturbance through the outer depressed cladding and the non-circular pump cladding, allowing more pump light to enter the inner depressed cladding. The inner depressed cladding filters out higher-order modes, increasing the fundamental mode energy ratio, thereby simultaneously optimizing beam quality and Raman suppression ratio, making it suitable as a gain medium for high-power lasers.
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