Optical fiber tunable broadband mode converter and preparation method thereof

A mode converter, fiber-type technology, applied in cladding fiber, dual-mode fiber, grating fiber, etc., can solve complex process, narrow, generally only ten or twenty nanometers, poor compatibility between optical fiber devices and optical fiber networks, etc. problem, to achieve the effect of simple production method and improved transmission capacity

Active Publication Date: 2022-07-29
NANJING NORMAL UNIVERSITY
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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

Method used

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  • Optical fiber tunable broadband mode converter and preparation method thereof
  • Optical fiber tunable broadband mode converter and preparation method thereof
  • Optical fiber tunable broadband mode converter and preparation method thereof

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preparation example Construction

[0042] The present embodiment provides a preparation method of an optical fiber-type tunable broadband mode converter, comprising the following steps:

[0043] (1) Fix the few-mode fiber;

[0044] (2) Evenly thin the few-mode fiber to the preset core radius R n ; Among them, uniform stretching is achieved by uniform stretching after heating to a molten state by a hydrogen-oxygen flame or a carbon dioxide laser;

[0045] (3) Fabrication of long-period fiber gratings with preset non-uniform periodic characteristics on the uniformly attenuated few-mode fiber, specifically by the fabrication of any fiber grating among ultraviolet, mechanical, arc, carbon dioxide laser or heating helical torsion way made.

[0046] This embodiment also provides another preparation method of the above-mentioned fiber-based tunable broadband mode converter, such as figure 2 shown, including the following steps:

[0047] (1) Fix the few-mode fiber between the fixture and the center of the rotator,...

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Abstract

The invention discloses an optical fiber type tunable broadband mode converter and a preparation method thereof. n Long-period fiber gratings with preset non-uniform periodic characteristics fabricated on the few-mode fiber. The invention has high compatibility, wide band tunable and flat conversion, and the manufacturing process is simple and easy to implement.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication and optical fiber sensing, in particular to an optical fiber 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 services. 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, and it is the key technology to realize large-capacity optical fiber communication in the future. Optical fiber mode converters, espec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02G02B6/255
CPCG02B6/02057G02B6/02047G02B6/02G02B6/2552G02B6/02123G02B6/02152
Inventor 赵华张苗苗郝媛媛王鹏李洪谱
Owner NANJING NORMAL UNIVERSITY
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