A photonic crystal fiber that actively filters out higher-order radial modes

Abstract

The present invention disclosed a photon crystal fiber that actively filter except for high -order radial mode, including the first air circular hole, high refractive index ring, second air round hole, third air circular hole, third air circular hole, and third air circular hole set from the inside to the outside.The fourth air round hole and optical fiber pack; the first air round hole is located in the center of the cross -section of the fiber; the number of air circular holes, the third air round hole, and the fourth air round hole are the same, and each layer of air hole is the same, and from small to large mutual mutual mutual mutual mutual mutual mutual mutual mutual mutual mutual mutual mutual mutual mutual mutual mutual mutual mutual mutual mutual mutual.Embeds.The present invention supports up to 226 OAM modes at 1.5 μm, and supports 208 OAM modes at 1.55 μm at 1.55 μm, which greatly increases the capacity of the communication system. By increasing the radius of the packet layer, the invention maintains the thickness, Can effectively suppress the high -level radial mode, but also reduce the impact of the purity of the OAM mode; the present invention has the advantages of inhibiting inter -model bruises and low non -linear coefficients. It is suitable for high -capacity OAM mode sub -communication systems.Application value.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to a photonic crystal fiber that actively filters out high-order radial modes. Background technique [0002] With the development of mobile Internet, big data and cloud computing, people's demand for communication capacity is growing rapidly. Therefore, several methods have been proposed to improve the transmission capacity of single-mode fiber, including time division multiplexing, polarization division multiplexing, and wavelength division multiplexing. However, since the transmission capacity of traditional single-mode fiber is gradually approaching the Shannon limit, it will be subject to many limitations. In order to overcome these obstacles, another new multiplexing technique, namely Modular Division Multiplexing (MDM), has been proposed, which is an effective tool to expand the communication capacity. As a special form of MDM, Orbital Angular Momentum (O...

AI Technical Summary

Problems solved by technology

However, the number of OAM modes, dispersion, nonlinearity, and mode quality of photonic crystal fibers still need to be improved, which also limits the increase in communication capacity

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