High-nonlinearity dispersion flattened photonic crystal fiber with pentagonal core

Abstract

The invention provides a high-nonlinearity dispersion flattened photonic crystal fiber with a pentagonal core. The high-nonlinearity dispersion flattened photonic crystal fiber comprises a quartz glass substrate. Micron-size air holes which are arranged according to certain rules are formed in the substrate, are axially distributed along the fiber and are perforated through the integral fiber; the arrangement rules of the air holes include that the air holes are divided into four layers, the air holes in each layer are arranged to form a regular pentagon, the innermost layer comprises five small air holes, the five small air holes are formed in five vertexes of the corresponding pentagon, and five tiny air holes are additionally formed in positions among the small air holes; the second layer comprises ten large air holes, and five large air holes are formed in five vertexes of the corresponding pentagon; the third layer, namely the second outer layer, comprises fifteen medium air holes, and five medium air holes are respectively formed in five vertexes of the corresponding pentagon; the outermost layer comprises twenty large air holes, and five large air holes are respectively formed in five vertexes of the corresponding pentagon. The high-nonlinearity dispersion flattened photonic crystal fiber has the advantage that requirements of the fields of fiber communication, nonlinear optics, optical signal processing and the like can be effectively met.

Description

technical field [0001] The invention relates to a photonic crystal fiber. Background technique [0002] Photonic crystal fiber is a new type of fiber developed on the basis of photonic bandgap theory. Because of its flexibility in structural design and unique optical properties, it has attracted extensive attention since it came out at the end of the 20th century. A typical photonic crystal fiber is composed of silica glass material and a certain number of air holes distributed in it. These air holes are distributed along the fiber axis and run through the whole fiber, so photonic crystal fiber is also called microstructure fiber or holey fiber. . The photonic crystal fiber structure design is flexible. By adjusting the size and arrangement of air holes in the cladding, the size of the hole gap, the size of the central entity, and the refractive index of the central entity, the photonic crystal fiber can have infinite single-mode transmission, high birefringence, and high n...

AI Technical Summary

Problems solved by technology

However, the performance of the existing highly nonlinear photonic crystal fiber and dispersion-flat photonic crystal fiber is not outstanding. For example, the nonlinear coefficient at 1.55um wavelength is 20km -1 .W -1 Below, the dispersion slope is at 10 -2 ps / (nm 2 .km) level

Can not well meet the requirements of nonlinear optics, supercontinuum and other applications

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