Optical fiber type tunable broadband mode converter and preparation method thereof

Abstract

The invention discloses an optical fiber type tunable broadband mode converter and a preparation method thereof, and the converter is specifically a long-period fiber bragg grating which is manufactured on a few-mode optical fiber which is uniformly thinned to a preset fiber core radius Rn and has a preset non-uniform period characteristic. The invention has the advantages of high compatibility, tunable broadband, flat conversion, simple manufacturing process and easy realization.

Description

technical field [0001] The invention relates to the technical fields of optical fiber communication and optical fiber sensing, in particular to an optical fiber type tunable broadband mode converter and a preparation method thereof. Background technique [0002] Today, the rapid development and popularization of Internet technology has brought about a rapid increase in the volume of information traffic, and the rapid development of big data, cloud computing, mobile Internet, and various network applications has led to an exponential increase in the demand for network transmission capacity. Optical fiber communication network is the backbone network of modern information network. Space division / mode division multiplexing technology combined with wavelength division multiplexing technology can greatly improve the capacity of optical fiber communication, which is the key technology to realize future large-capacity optical fiber communication. Fiber-optic mode converters, especi...

AI Technical Summary

Problems solved by technology

Among them, although the mode converter based on the traditional fiber grating can be tunable through the transformation of the grating period, it usually has a narrow bandwidth, generally only ten or twenty nanometers, and cannot cover the entire communication band; Wide bandwidth, but the dispersion conversion point is an inherent characteristic of optical fiber, it is difficult to achieve tunability (https: / / doi.org / 10.1364 / OE.389471), and if a wider bandwidth is to be achieved, the center of the conversion spectrum will not be flat enough , that is, the band center conversion efficiency is not high

The broadband mode conversion can be realized by using specially designed optical fibers or couplers. For example, the three-core optical fiber in the patent "A Broadband Mode Converter (Chinese Patent CN 203838366 U)" can realize the conversion between the fundamental mode and the higher-order mode, but this The method requires complex processes and has poor compatibility with existing optical fiber devices and optical fiber networks

In summary, the existing fiber mode converters do not have broadband tunable and flat conversion characteristics at the same time, and the requirements for processing technology and compatibility with existing fiber optic networks are poor

Images