Broadband optical fiber mode converter
A mode converter and optical fiber technology, applied in the direction of cladding optical fiber, optical waveguide light guide, etc., can solve the problems of increasing manufacturing difficulty and complex structure, and achieve the effect of realizing mass production, simplifying the manufacturing process and improving the conversion efficiency.
Inactive Publication Date: 2014-04-16
STATE GRID CORP OF CHINA +1
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Mode conversion can also be realized by using a photonic crystal fiber structure [a fiber mode converter, application number: 200810021652.8], but the structure is more complicated, which increases the difficulty of production
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[0024] like figure 1 As shown, the cladding materials of cores I, II, and III are all pure quartz. The core diameter of core I is 8 μm, the refractive index difference between the core and the cladding is 0.005, the core diameter of the core II is 11.5 μm, the refractive index difference between the core and the cladding is 0.007, the core I and the core The distance between core II is 14 μm, the core diameter of core III is 15 μm, the refractive index difference between core and cladding is 0.009, and the distance between core II and core III is 16.9 μm. LP in core I 01 LP in mode, core II 11 LP in mode and core III02 The effective refractive index of the mode depends on the wavelength as figure 2 shown. The length of the optical fiber is taken as 3.9 mm. The wavelength range where the conversion efficiency is greater than 80% is 1.47~1.522 nm, and its working bandwidth can reach 52nm.
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The invention discloses an optical fiber mode converter. The optical fiber mode converter is a three-core optical fiber which is composed of fiber cores (I, II and III). The centers of the three fiber cores are in the same straight line, the fiber core I and the fiber core III are distributed at two sides of the fiber core II, the normalized frequency V1 of the fiber core I meets V1 <2.405, the normalized frequency V2 of the fiber core II meets V1 >2.405, and the normalized frequency V3 of the fiber core III meets V1 >3.832 and meets V1&1t; V2&1t; V3. The optical fiber mode converter adopts the three-core optical fiber structure, achieves conversion between different optical fiber fundamental modes and high order modes, and effectively improves the conversion efficiency between the optical fiber fundamental modes and the high order mode needing converting through transition of a middle mode. The simple three-core optical structure, especially a micro structure optical fiber manufacturing process is adopted, air holes do not need to be led in, the manufacturing process is simplified, the complexity of later processing on an optical fiber with air holes is avoided, and batch production can be achieved.
Description
technical field [0001] The invention relates to the field of optical fiber communication, in particular to an optical fiber mode converter for realizing conversion between modes. Background technique [0002] With the development of few-mode fiber technology and its applications, the mode converter, as a key component, has received more and more attention. A fiber mode converter is a device that converts between different mode fields of an optical fiber. An ideal fiber mode converter should be able to efficiently convert the corresponding modes, have a wide operating bandwidth, and ensure that the output mode has low crosstalk. [0003] Several devices suitable for fiber mode conversion have been proposed, among which the mode converter based on fiber grating is the most commonly used, but its working bandwidth is narrow. Mode converters based on optical holography and multimode fiber couplers have also been proposed [ Journal of Lightwave Technology, 2012, 30(12): 1978...
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IPC IPC(8): G02B6/14G02B6/02
Inventor 王华陈明阳祝远锋李路明孙欣杨济海陈磊陈健陈鹍
Owner STATE GRID CORP OF CHINA