Patent ID: 8081855
Filing Date: 2011-12-20
Classification: G02B

Abstract:
1. An optical fiber comprising a core having a refractive index n 1 , a first cladding surrounding the core and having a refractive index n 2 smaller than the refractive index n 1 , a second cladding surrounding the first cladding and having a refractive index n 3 smaller than the refractive index n 2 , and a third cladding surrounding the second cladding and having a refractive index n 4 greater than the refractive index n 3 , wherein the second cladding consists of SiO wherein, with respect to the refractive index n and the inner radius r wherein the bending loss at a wavelength of 1550 nm and at a radius of curvature of 7.5 mm is smaller than 0.1 dB/turn, and the bending loss at a wavelength of 1625 nm and at a radius of curvature of 4 mm is greater than 0.1 dB/turn, and mode field diameter at a wavelength of 1310 nm is in the range of 8.6 μm to 9.2 μm, cable cut-off wavelenth λcc is equal to or smaller than 1260 nm and zero dispersion wavelength λ