Optical fiber mode converter
A mode converter and optical fiber technology, applied in cladding optical fiber, optical waveguide and light guide, etc., can solve the problems of narrow working bandwidth and narrow bandwidth, and achieve the effect of improving conversion efficiency and simple optical fiber structure
Active Publication Date: 2014-04-02
江阴智产汇知识产权运营有限公司
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Problems solved by technology
Several devices suitable for fiber mode conversion have been proposed, among which the mode converter based on fiber Bragg grating is the most commonly used, but its operating bandwidth is narrow, about a few nanometers
In addition, people have also proposed a method to achieve mode conversion in two cores of an optical fiber [Applied Optics, 2012, 51(19), 4388], this mode converter can realize LP 01 Die and LP 02 The mutual conversion of the mode, but the wavelength range of the structure conversion efficiency greater than 80% is 22nm, and the bandwidth is narrow
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[0025] Such as figure 1 As shown, the cladding materials of optical fiber I, optical fiber II, and optical fiber III are all pure silica, and the refractive index difference between the core and the cladding is all 0.005. The core diameter of fiber I is 7.9 μm, the core diameter of fiber II is 15.5 μm, the distance between the cores of fiber I and fiber II is d 1 =6μm, the distance d between the cores of fiber II and fiber III 2 =6μm, the core diameter of fiber III is 24.3μm. Among them, optical fiber I and optical fiber II adopt the method of grinding the cladding of optical fiber, and one end of optical fiber I and optical fiber II is ground to remove part of the cladding and bonded together, and the grinding length is L 1 , and then grind the other end of the fiber II and part of the cladding of the fiber III and bond them together, the grinding length is L 2 , put the polished three optical fibers together to seal and package. LP in Fiber I 01 Mode, LP in Fiber II...
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The invention discloses an optical fiber mode converter. The optical fiber mode converter consists of an optical fiber I, an optical fiber II and an optical fiber III; a fundamental mode is converted into a transition high-order mode 1 first by the optical fiber I and the optical fiber II; the high-order mode 1 is then converted into a required high-order mode 2 by the optical fiber II and the optical fiber III, wherein the optical fiber I is used for transmitting the fundamental mode; the optical fiber II and the optical fiber III are used for transmitting the high-order modes; the effective refraction index of the fundamental mode of the optical fiber I and the effective refraction indexes of the corresponding high-order modes of the optical fiber II and the optical fiber III are equal at an operating wavelength. According to the optical fiber mode converter, the conversion between the fundamental mode and the high-order modes is realized by utilizing the coupling between the fundamental mode and the high-order modes in the optical fibers, and high-efficiency conversion of a broad band can be realized. Different modes are transmitted in different optical fibers; the crosstalk between the modes is low; meanwhile, the optical fiber mode converter has the characteristics of simple optical fiber structure and convenience in connection.
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] Because single-mode fiber can avoid the intermodal dispersion problem of multimode fiber transmission, it is currently widely used in communication, sensing and other fields. In recent years, many new types of optical fiber structures have been proposed. For example, the Bragg fiber adopting the principle of photonic bandgap, the mode with the lowest transmission loss is not the LP of ordinary single-mode fiber 01 Die, but TE 01 mold. In addition, people have also proposed to use high-order modes to realize dispersion compensation technology, so as to realize large mode field and low-loss optical transmission. [0003] Information transmission can also be achieved by using higher-order modes. Space division multiplexing is considered as a method to further increase...
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Inventor 陈明阳陆驹张永康
Owner 江阴智产汇知识产权运营有限公司