Defected core microstructure optical fiber for orbital angular momentum transmission and preparation method thereof

Abstract

The invention discloses a defect core microstructure optical fiber for orbital angular momentum transmission and a preparation method, and belongs to the field of optical fiber communication. The defect core microstructure optical fiber comprises a fiber core area, an inner cladding area and an outer cladding area, a plurality of capillary rods surround a first capillary stack to form a solid annular fiber core, and an optical waveguide is transmitted in the annular fiber core; wherein the inner cladding region comprises air holes which are periodically distributed around the periphery of the fiber core region; the outer cladding region sleeves the inner cladding region; the fiber core area, the inner cladding area and the outer cladding area are made of the same material. The optical fiber has the advantages of being made from the same material without extra doping of other materials, thereby reducing the cost; by introducing the air holes, the effect of constraining the waveguide is achieved; based on the stacking method of the photonic crystal fiber, the preparation of the fiber is no longer a theoretical idea, the fiber can be actually prepared, and the optical waveguide parameters of the microstructure fiber can be adjusted during structural design so as to meet the parameter requirements applied to different scenes.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to a defect-core microstructure optical fiber for orbital angular momentum transmission and a preparation method. Background technique [0002] Orbital angular momentum (OAM) is the component of the beam's angular momentum that depends on the field spatial distribution and not on the polarization state of the light. The transmission methods of OAM beams mainly include free space transmission and optical fiber transmission. Compared with free space transmission, optical fiber transmission can isolate the transmission signal from the external environment, reduce external interference, increase information capacity, and extend transmission distance. The transmission parameters of the OAM beam in the fiber have a decisive influence on the structure of the fiber, including parameters such as the number of supported OAM modes, crosstalk between modes, mode purity, and mode tran...

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Problems solved by technology

[0003] At present, there are the following problems in the proposed optical fiber structure for transmitting OAM beams: the capillary holes are arranged in a circular manner, which cannot be realized by the stacking process, and it is difficult to realize the production of meter-scale optical fiber preforms; the use of square capillary When the optical fiber is melted and stretched, all the air hole structures formed tend to be circular. Therefore, the optical fiber with square-shaped air holes is only theoretically feasible, and it is difficult to realize in the actual preparation process; the existing Although the photonic crystal fiber structure is used for reference in the technical scheme, its waveguide structure is still based on the difference in refractive index produced by different materials, and its external capillary structure does not play a role in confining the waveguide. Therefore, it is urgent to study a A defect-core microstructure optical fiber and preparation method for orbital angular momentum transmission that can be implemented and can be prepared to meet the needs of actual use

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