ULTRALOW-ATTENUATION BEND-INSENSITIVE SINGLE-MODE OPTICAL FIBRE

摘要

Disclosed is an ultralow-attenuation bend-insensitive single-mode optical fibre, comprising a core layer and cladding layers. The radius r1 of the core layer is 3.0 to 3.9 μm; the relative refractive index Δn1 of the core layer is -0.04% to 0.12%; the core layer is sequentially wrapped by an inner cladding layer, a sunken inner cladding layer, an auxiliary outer cladding layer and an outer cladding layer from the inside to the outside; the radius r2 of the inner cladding layer is 8 to 14 μm; the relative refractive index Δn2 is -0.35% to -0.10%; the radius r3 of the sunken inner cladding layer is 14 to 20 μm; the relative refractive index Δn3 is -0.6% to -0.2%; the radius r4 of the auxiliary outer cladding layer is 35 to 50 μm; and the relative refractive index Δn4 is -0.4% to -0.15%. The optical fibre has a lower attenuation coefficient and an excellent bending property, and by rationally designing the section of core and cladding layers of the optical fibre, the optical fibre has an MFD equal to or greater than 8.4. Parameters of the optical fibre, such as cutoff wavelengths, bending loss and chromatic dispersion, are good on an applied frequency band, and the optical fibre can be compatible with the G657.A2 standard.