Multi-core optical fiber suitable for simultaneous data transmission and quantum communication

By designing multi-core optical fibers and employing different refractive index distributions and low refractive index regions, the security and cost issues of traditional optical fibers in data transmission and quantum communication have been solved, achieving efficient and secure data and quantum communication.

CN122122489APending Publication Date: 2026-05-29CORNING INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CORNING INC
Filing Date
2024-10-10
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing optical fibers pose security risks in data transmission and quantum communication. Traditional optical fibers are easily eavesdropped on, and optical fibers used for quantum communication are expensive.

Method used

Design a multi-core optical fiber comprising core units with different refractive index distributions and a common cladding, with the distance between adjacent cores being greater than or equal to 40 µm, employing germanium oxide-doped and alkali-doped silicon cores, optimizing the loss characteristics of the quantum communication core, and reducing crosstalk through the low refractive index region.

Benefits of technology

It achieves the security and efficiency of simultaneous data transmission and quantum communication, reduces costs, and maintains high data rates and low crosstalk.

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Abstract

An optical fiber includes a plurality of core units and a common cladding surrounding the core units. At least two of the plurality of core units have different refractive index profiles. One of the at least two core units has a core unit outer radius a1 and includes a silicon-based core doped with germanium oxide. The other core unit includes an alkali-doped silicon core free of germanium oxide and has a core unit outer radius a2 such that a1 < a2. An inter-core distance X between adjacent cores is 45 µm ≤ X.
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