Improved multimode optical fiber and its prepn. method

Abstract

This invention relates to multimode fiber and its processing method. Diameters of its core layer and clad are 50 um and 125 um with optimized refractive index distribution at 850 nm length, the fiber differential mode delay test curves are of the continuous rising and falling curves with the maximum variation smaller than 0.33 ps / m, fully filling band width of large than 1500 MHz / km at 850 nm and larger than 600 MHz / km at 1300nm, the effective band widths are larger than 2000 MHz.km / 600MHz.km at 850 nm and 1300nm separately. In processing method, the deposition speed is from 2.5g / min to 1.5 g / min, Ge steam flor from 3%-6%, the thawing aperture is controlled at 2-8 mm, then C2F6 corrosion gas is inlet to corrode internal wall of the tube and twist the fiber in wire drawing.

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-...

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