A Taper-Based Hole-Assisted Dual-Core Fiber Mode Converter

Abstract

The invention belongs to the field of optical fiber communication, in particular to the field of a taper-based hole-aided dual-core optical fiber mode converter. A taper-based hole-assisted dual-core fiber mode converter, comprising: an intermediate core 1, a suspension core 2, a single-mode fiber 3, a hole-assisted dual-core fiber 4, a hole-assisted dual-core fiber air hole 5, and a microscope objective lens 6 , an infrared CCD camera 7, the single-mode optical fiber 3 and the middle core 1 are directly oppositely welded, the suspension core 2 is close to the hole to help the inner wall of the double-core fiber air hole 5, and the edge of the suspension core 3 is 2-7 microns away from the edge of the middle core 1. The beneficial effects of the present invention are: the mode converter adopts a hole-assisted dual-core optical fiber with a special structure, that is, a single optical fiber has a dual-core structure of a single-mode and a higher-order mode, which realizes the mode conversion in a single optical fiber, and the device Small and high integration, simple manufacturing process. The mode conversion wavelength is controllable, the mode conversion efficiency is high, and the converted high-order mode has high purity.

Description

technical field [0001] The invention belongs to the field of optical fiber communication, in particular to the field of a taper-based hole-aided dual-core optical fiber mode converter. Background technique [0002] At present, optical fiber communication is widely used in petrochemical, electric power, medicine, civil engineering and many other fields because of its advantages such as low transmission loss, wide transmission frequency, light weight, anti-electromagnetic interference, electrical insulation, and corrosion resistance. Due to the limitation of its transmission energy, single-mode optical fiber can no longer meet the needs of the industry, and space division multiplexing technology can improve the transmission capacity of optical fiber, and has the potential to overcome this bottleneck. The optical fiber used is a few-mode optical fiber with multi-mode or multimode fiber. Compared with multimode fiber, few-mode fiber has greater mode dispersion and strict mode c...

AI Technical Summary

Problems solved by technology

However, these methods for generating high-order modes are all based on the mode conversion of the fundamental mode oscillation in the fiber cavity, so the purity of the generated high-order modes will be greatly limited due to the conversion efficiency and bandwidth.

Grating-type mode converters rely on strict phase matching and asymmetric refractive index interference to realize their functions, which makes the device complex and difficult to realize

However, the horizontal dislocation splicing technology is limited by the need for precise welding and artificial dislocation technology, and the repetition rate is not high

Images