Dispersion flatted photonic crystal fiber and dispersion regulation and control method thereof
A photonic crystal fiber, dispersion flattening technology, applied in cladding fiber, multi-layer core/cladding fiber, etc., can solve the problems of limiting the applicability of dispersion flattening photonic crystal fiber, increasing difficulty, etc., to improve production cost rate, The effect of convenient and simple processing and cost reduction
Inactive Publication Date: 2015-04-15
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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Problems solved by technology
In the existing literature and patents, when people design photonic crystal fibers with different dispersion characteristics, they usually involve changing the diameter of some holes. Dispersion-flattened photonic crystal fibers add difficulty, thereby limiting the applicability of dispersion-flattened photonic crystal fibers
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[0040] First, rotate the innermost layer of the inner cladding around the fiber core by 1 degree, 2 degrees, ..., 30 degrees in a clockwise direction to obtain the dispersion curves of the optical fiber corresponding to different rotation angles;
[0041] Then, in the obtained different dispersion curves, find the rotation angle corresponding to the flattest near-zero dispersion curve in the range of 1.2 microns to 1.6 microns as the optimal rotation angle of the innermost layer. When the angle is 8 degrees, the dispersion curve is the most excellent;
[0042] Thereafter, the second layer in the inner cladding is rotated 1 degree, 2 degrees, ... 30 degrees around the fiber core in a clockwise direction, and the dispersion curves of different rotation angles are compared. It is found that when the rotation angle is 19 degrees, the dispersion curve optimal;
[0043] Then, compare the dispersion curves corresponding to the optimal rotation angle obtained above, as figure 2 As ...
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The invention discloses a dispersion flatted photonic crystal fiber. The fiber comprises a fiber core, an inner wrapping layer and an outer wrapping layer. The inner wrapping layer is of a multi-layer structure, each layer is of a regular 2N-side-shaped structure, and a plurality of hole structures are evenly formed in the regular 2N-side-shaped structure. The fiber core is formed by an area surrounded by the innermost layer of the inner wrapping layer, the inner wrapping layer is wrapped by the outer wrapping layer which is of a multi-layer structure, each layer is of a regular 2N-side-shaped structure, a plurality of hole structures are evenly formed in the regular 2N-side-shaped structure, the central point of the fiber serves as the centers of multi-layer regular 2N-side shapes of the inner wrapping layer and the outer wrapping layer, intervals of the hole structures in each layer are the same, corresponding sides of each layer of regular 2N-side-shaped structure in the outer wrapping layer are parallel to each other, the corresponding sides of at least one layer of the regular 2N-side-shaped structure in the inner wrapping layer are not parallel to the corresponding sides of the outer wrapping layer, and the diameter of all the hole structures is the same. By means of a method of keeping the same size of the hole structures of the wrapping layers, difficulties of tensioning the dispersion flatted photonic crystal fiber of high quality are reduced.
Description
technical field [0001] The invention belongs to the field of optical fiber technology, and more specifically relates to a dispersion-flat photonic crystal fiber and a method for adjusting and controlling its dispersion. Background technique [0002] Photonic crystal fiber can also be called holey fiber. Its center is composed of a core without one or more hole structures, and the core is surrounded by a multi-layer hole structure cladding. Photonic crystal fiber has a large degree of design freedom. By rationally designing the lateral structure of photonic crystal fiber and changing the hole diameter and hole spacing in the microstructure fiber cladding, appropriate dispersion characteristics can be obtained. Among them, the flattened positive dispersion, flattened zero dispersion and negative flattened dispersion photonic crystal fiber have important applications in the fields of dispersion compensation, low dispersion transmission, and optical fiber sensor devices. In the...
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IPC IPC(8): G02B6/036
Inventor 侯金杨春勇陈少平赵佳佳
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES