Multi-core erbium-doped super-mode optical fiber for gain equalization

Abstract

The invention discloses a multi-core erbium-doped super-mode optical fiber for gain equalization, and belongs to the field of special optical fibers, optical fiber communication and signal processing. The multi-core optical fiber comprises nineteen cores, comprising a central core (1), first-layer cores (1-1)-(1-6) and second-layer cores (2-1)-(2-12), wherein the nineteen cores are uniformly distributed in a regular hexagon shape and are positioned in the same cladding (2), the radius of each core is 4-6 [mu]m, and the distance between the cores is 10-16 mu m. Due to the fact that the space between the cores is small, the nineteen cores jointly form a high-refractive-index area (3), in the area (3), the optical fiber supports super-mode transmission, and the number of scalar modes supported by the optical fiber ranges from 4 to 15. Erbium ions are doped in the first-layer cores (1-1)-(1-6) and the second-layer cores (2-1)-(2-12) except the central core (1), so that the gain of a fundamental mode is reduced, and the gain balance of the fundamental mode and a high-order mode is realized.

Description

technical field [0001] The invention relates to a multi-core erbium-doped supermode optical fiber used for gain equalization, belonging to the fields of special optical fiber, optical fiber communication and signal processing. Background technique [0002] The development of modern information technology has promoted the comprehensive integration and penetration of technologies such as the Internet of Things, cloud computing, and artificial intelligence into various industries, resulting in a surge in network data traffic. However, optical fiber communication is the cornerstone of the data transmission bearer network. With the application of time division multiplexing, wavelength division multiplexing, polarization multiplexing and other technologies, due to nonlinear constraints, the capacity of single-mode optical fiber is close to Shannon's limit, making it difficult to improve. Laying a large number of single-mode optical fiber cables will bring volume consumption and to...

AI Technical Summary

Problems solved by technology

Due to the different mode field distributions of different LP modes in the multi-core supermode fiber, when the signal is amplified, there will be a gain competition between the signal modes, so as to obtain different gains (because the fundamental mode energy is more concentrated, the general fundamental mode obtained The gain is the largest), and the transmission loss of each mode in the fiber is different. This energy difference will accumulate with the transmission distance, which is likely to cause system interruption and increase the bit error rate at the receiving end, and even destroy the entire communication system.

However, there are few reports on amplifiers for multi-core supermode fiber communication systems

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