BEND-INSENSITIVE HIGH-BANDWIDTH MULTI-MODE OPTICAL FIBER

Abstract

A bend-insensitive high-bandwidth multi-mode optical fiber. The optical fiber comprises a core layer, an extension layer, an inner cladding layer, a depressed cladding layer and an outer cladding layer, which are sequentially arranged from inside to outside, wherein a refractive index profile of the core layer is parabolic, a profile index ranges from 1.9 to 2.2, and the maximum relative refractive index difference of a central position of the core layer ranges from 0.9% to 1.2%; the relative refractive index difference of the extension layer ranges from -0.03% to -0.02%; the difference between the highest relative refractive index difference and the lowest relative refractive index difference of the inner cladding layer ranges from 0.005% to 0.03%, and the single-side radial width of the inner cladding layer ranges from 0.5 µm to 4 µm; and the single-side radial width of the depressed cladding layer ranges from 3 µm to 9 µm, and the relative refractive index difference of the depressed cladding layer ranges from -0.7% to -0.4%. By means of rationally designing a waveguide structure and a doping system, the optical fiber viscosity thereof is optimized, and the sensitivity of an optical fiber bandwidth to the wavelength is reduced, such that the optical fiber has both a good bending resistance performance and an ultra-high bandwidth performance.

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