Improved multimode optical fiber and its prepn. method

Abstract

The present invention relates to a multimode optical fiber and a manufacturing method thereof. The diameters of the core layer and the cladding layer of the multimode optical fiber are 50 μm and 125 μm respectively, and its refractive index distribution is precisely optimized at a wavelength of 850 nm. The differential mode delay test curve of the optical fiber is: A continuous rising or falling curve, and its maximum change is less than 0.22ps / m, the full injection bandwidth is greater than 1500MHz·km at 850nm, greater than 600MHz·km at 1300nm, and the effective bandwidth is greater than 2000MHz·km and 600MHz·km at 850nm and 1300nm respectively. In its manufacturing method, the deposition rate is from 2.5g / min to 1.5g / min, the flow rate of germanium vapor is from 3% to 60%, and the diameter of the shrinkage hole is controlled to be between 2 and 8mm in diameter during melting and shrinkage, and then the C 2 f 6 The corrosive gas corrodes the inner tube wall; the optical fiber is rubbed during the drawing process. The invention completely eliminates the center depression of the multi-mode optical fiber, reduces inter-mode delay, increases the bandwidth of the optical fiber, and can be used not only in high-speed network systems, but also in low-speed network systems.

Description

technical field [0001] The invention relates to an optical fiber and a manufacturing method thereof, in particular to a multimode optical fiber and a manufacturing method thereof. Background technique [0002] Multimode fiber is a data communication fiber used earlier in communication systems. Due to its large core diameter and numerical aperture, multiple stable conduction modes (usually more than a few hundred), large optical transmission energy and relatively loose technical requirements, multimode fiber has always been used in the field of optical communication. used. However, due to the existence of multiple transmission modes in the multimode fiber, the dispersion of the fiber is very large, which affects the application of the multimode fiber in high-speed networks. As we all know, the dispersion of optical fiber mainly includes material dispersion, waveguide dispersion and mode dispersion (also known as intermodal dispersion). For single-...

AI Technical Summary

Problems solved by technology

[0015] The technical problem to be solved by the present invention is: aiming at the existing multimode optical fiber having center depression and large mode delay, thereby affecting the bandwidth characteristics of the optical fiber, reducing the performance of the optical fiber, and causing problems affecting the application of the multimode optical fiber in high-speed networks, it is proposed An improved multimode optical fiber and its manufacturing method to make up for the deficiencies of existing products

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