Bending insensitive multimode fiber and manufacturing method thereof

Abstract

The invention relates to a bending insensitive multimode fiber and a manufacturing method thereof. The bending insensitive multimode fiber comprises a core layer and a cladding coating the core layer, wherein the refractivity profile of the core layer presents alpha power exponent function distribution. The bending insensitive multimode fiber is characterized in that the cladding comprises an inner cladding layer, a depressed cladding layer and an outer cladding layer sequentially from inside to outside; the core layer distribution exponent alpha is 1.9 to 2.2, the radius R1 is 23 to 27 mum, and the maximum relative refractive index difference delta1max is 0.9 to 1.2%; the radius of the inner cladding layer is R2, the unilateral radial thickness is 1 to 3 mum, and the refractive index difference delta2 is 0 to 0.05%; the radius of the depressed cladding layer is R3, the unilateral radial width is 10 to 20 mum, and the relative refractive index difference delta3inner at the place close to the inner cladding layer along a diameter direction is -0.29 to -0.42%; and the outer cladding layer is a pure silica glass layer. Thus, the structure is reasonably designed, the anti-bending and the bandwidth performance are excellent, the process is convenient to control, and the manufacturing and the production are easy.

Description

technical field [0001] The invention relates to a bending insensitive multimode optical fiber with excellent bending resistance and a manufacturing method thereof, belonging to the technical field of optical communication. Background technique [0002] With the continuous development of science and technology, China has entered the era of rapid information development of optical fiber broadband and multi-service integration. The integrated telecommunication network, broadcasting network, and Internet can carry various information services, and can provide users with various services such as making calls, surfing the Internet, and watching TV. In particular, the introduction of concepts such as cloud computing and the Internet of Things in recent years has brought a tsunami-like data impact to existing networks. This will definitely speed up the construction and popularization of applications such as data centers, enterprise computer rooms, storage area networks (SAN), netwo...

AI Technical Summary

Problems solved by technology

One method is to take a fluorine-doped gap sleeve and a mandrel with a certain low refractive index to form a mandrel with a sunken layer through secondary melting and shrinkage. The disadvantage of this method is that the process flow becomes longer, and the mandrel and the so-called doped The fluorine bushing requires certain pretreatment, such as a large amount of corrosion on the liner glass part of the original mandrel before the second shrinkage

Another improved method is to directly deposit a fluorine-doped glass tube with a certain low refractive index as the liner. Due to the low viscosity of the fluorine-doped quartz glass, it is easy to bend and deform during deposition, and the geometric parameters of the optical fiber produced are extremely low. easy to deteriorate

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