BROADBAND MULTIMODE OPTIC FIBRE OPTIMIZED FOR MULTIMODE AND SINGLE-MODE TRANSMISSIONS

摘要

FIELD: communication.;SUBSTANCE: proposed invention relates to fibre-optic communication, more specifically to an optic fibre optimized to provide both single-mode and multimode transmission. Proposed optic fibre has an optical core and an optical shell surrounding the optical core, herewith the optical core has a gradient refraction index profile with minimum refraction index n₁ and maximum refraction index n₀. This optic fibre has numerical aperture NA and radius of the optical core a both satisfying criterion C of optic communication quality described by the following equation: C=NA-0.02×α, where Δ – rated refraction index difference; and by that the said minimum and maximum refraction indexes n₁, n₀ and radius a of the optical core are selected of such values, that NA 0.20, α 10 µm and |C| 0.20.;EFFECT: technical result is creation of an optic fibre, which is simple in fabrication, considerably reduces the mode noise at the wavelengths of 1,310 nm and 1,550 nm, at the same time providing a wide mode frequency band at the wavelength of 850 nm, and also provides a wide mode frequency band for multimode long-range transmission and supports the main mode similar to the one required for single-mode transmission.;15 cl, 8 dwg, 2 tbl