A photonic crystal fiber

Abstract

The invention discloses a photonic crystal fiber. The fiber comprises a core layer, a covering layer and a coating layer from the interior to the exterior. The cross section of the fiber is circular.The core layer, the covering layer and the coating layer are concentric. The core layer is arranged in the innermost layer. A circular hole is arranged in the center of the cross section of the core layer. Multiple elliptic air holes are uniformly arranged in the covering layer. The covering layer comprises 5 covering layer rings. The air holes in each covering layer ring are arranged in an annular array manner by taking the center of the core layer as the center original point. The size of the area of the cross sections of the air holes in the covering layer rings are successively increased from the inner ring to the outer ring. Long shafts of the elliptic air holes point to the center of the core layer. The intervals between the covering layer rings are successively increased from the inner ring to the outer ring. The core layer and the covering layer are made of silicon dioxide crystals or silicon crystals. The coating layer is made of acrylic ester or silicone rubber. According tothe invention, multiple orbital angular momentum modes can be transmitted; the effective refractivity reach 10-3 orders; the confinement loss is low; the nonlinear coefficient is small; and the chromatic dispersion is low.

Description

technical field [0001] The invention belongs to the field of communication, and in particular relates to a photonic crystal fiber. Background technique [0002] Orbital Angular Momentum (Orbital Angular Momentum) is another important parameter of photons besides the traditional wavelength, polarization and other parameters. With the continuous improvement of technologies such as wavelength division multiplexing, time division multiplexing, and code division multiplexing in the field of optical communication, the amount of transmitted data is close to saturation, and OAM provides a new way for beam multiplexing. degrees of freedom. [0003] In the OAM optical fiber communication system, the optical fiber supporting OAM mode transmission is a key component. In recent years, Photonic Crystal Fiber (PCF) has attracted extensive attention. Photonic crystal fiber, also known as microstructure or holey fiber, mainly consists of a core and tiny air holes periodically arranged aro...

AI Technical Summary

Problems solved by technology

But its high loss is limiting its development

At the same time, in terms of supporting OAM mode transmission, its effective refractive index difference is always maintained at 10 -4 The order of magnitude cannot be further improved, so it is prone to odd-even eigenmode shift, birefringence and polarization mode dispersion, which affects the mode purity and causes inter-mode coupling or crosstalk

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