Transmission optical fiber having large effective area

摘要

The present invention relates to a transmission optical fiber comprises a central core having a radius (r 1 ) larger than or equal to 5.5 µm and a refractive index difference (”n 1 ) less than or equal to 5.0.10 -3 ; an intermediate cladding having a radius (r 2 ) and a refractive index difference (”n 2 ), the width of the intermediate cladding (r 2 -r 1 ) being more than 5 µm; and a depressed cladding having a radius (r 3 ) and a refractive index difference (”n 3 ) less than or equal to -3.5.10 -3 , the width of the depressed cladding (r 3 -r 2 ) being less than 5 µm. The optical fiber has an effective area larger than 120 µm 2 with a cut-off wavelength limited to 1600 nm without degradation of other optical parameters of the optical fiber as compared with a SSMF, notably in terms of losses and dispersion.