Patent ID: 6704486
Filing Date: 2004-03-09
Classification: G02B,H01S,H04B

Abstract:
An optical fiber having a refractive index profile and including at least one annular region between a center core and a cladding layer, havinga Rayleigh scattering coefficient not more than 1 &mgr;m4Â·dB/km, a first relative refractive index difference &Dgr;1 of said center core with respect to said cladding layer of a positive value not more than 0.9%, a second relative refractive index difference &Dgr;2 of an annular region adjoining said center core with respect to said cladding layer from âˆ’0.7% to âˆ’0.2%, and an effective area (Aeff) not more than 60 &mgr;m2.