Multi-core optical fiber amplifier with large core-to-package ratio and gain method

By introducing a low-refractive-index isolation region and a local windowing process into the multi-core optical fiber cladding, the problem of low pump light coupling efficiency in traditional multi-core optical fiber amplifiers is solved, and efficient pump light capture and gain balance are achieved, making it suitable for multi-channel communications and high-power laser synthesis systems.

CN120669462APending Publication Date: 2025-09-19HANGZHOU SUOTONG PHOTONIC TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202511165552.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-20
Publication Date
2025-09-19

AI Technical Summary

Technical Problem

Traditional multi-core fiber amplifiers have shortcomings in pump light utilization and gain consistency. Conventional cladding structures make it difficult to achieve accurate and efficient pump light coupling, resulting in limited pump efficiency and structural losses.

Method used

A multi-core fiber structure with a large core-to-cladding ratio is adopted. By introducing a low-refractive-index isolation zone in the cladding, the pump propagation area is compressed, and a window is opened or etched locally on the surface of the fiber cladding to form a pump injection area. Positioning and fixing with a V-groove fixture or a nested fixture can achieve efficient pump light coupling.

Benefits of technology

It significantly improves the core-to-cladding area ratio, enhances the pump capture efficiency, improves the system power utilization and inter-channel gain balance, and reduces structural losses. It is suitable for multi-channel communication systems and high-power laser synthesis platforms.

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Abstract

The invention discloses a multi-core optical fiber amplifier with a large core-to-cladding ratio and a gain method. The multi-core optical fiber amplifier is characterized by comprising a multi-core optical fiber formed by a plurality of independent rare earth-doped fiber cores and a cladding structure located on the outer side of the multi-core optical fiber, the cladding structure is internally provided with at least one layer of low-refractive-index isolation region which is used for remarkably compressing the effective cladding area of pumping propagation and improving the capturing efficiency of the whole pumping energy, and the ratio of the total cross sectional area of the multi-core optical fiber to the effective cladding area is not less than 0.1. The low-refractive-index isolating layer is embedded in a conventional cladding structure, so that a pump light propagation area can be effectively compressed on an optical path, the relative proportion of the fiber core in the cross section is increased, the proportion (CCAR is larger than or equal to 0.1) of the total area of the fiber core to the cladding area is remarkably increased, and therefore the pump capture efficiency is improved.
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