SINGLE-MODE OPTICAL FIBRE Russian patent published in 2013 - IPC C03B37/28 G02B6/36 

FIELD: chemistry.

SUBSTANCE: invention relates to fibre-optic communication, particularly to fibre having considerably low bending loss. The single-mode optical fibre includes, from the centre to the periphery, a core, an intermediate cladding, a cladding, an indented groove and an outer optical cladding. The core has radius r₁ and positive refraction index difference Δn₁ with the cladding; the intermediate cladding has radius r₂ and positive refraction index difference Δn₂ with the optical cladding, wherein Δn₂ is less than the refraction index difference Δn₁ of the core. The cladding with the indented groove has radius r₃ and negative refraction index difference Δn₃ with the optical cladding. The optical fibre has nominal mode field diameter (MFD) ranging from 8.6 mcm to 9.5 mcm at wavelength of 1310 nm, and for wavelength of 1550 nm, the fibre has bending loss of less than 0.15 dB/winding for radius of curvature of 5 mm and cable cutoff wavelength less than or equal to 1260 nm, measured at wavelength at which attenuation of mode LP11 is greater than or equal to 19.3 dB after propagating 22 m on the fibre. Such a fibre can be used in difficult operating conditions, for example miniature optical boxes.

EFFECT: high bending resistance of the fibre.

15 cl, 4 tbl, 2 dwg