Patent ID: 6507689
Filing Date: 2003-01-14
Classification: G02B

Abstract:
An optical transmission fiber with a low non-linearity coefficient &ggr; and high effective area for use in an optical transmission system, the optical transmission fiber comprising:a core region comprising: a glass inner core having a first maximum refractive index difference &Dgr;n1; a first glass layer radially surrounding the inner core, having a refractive index difference &Dgr;n2 less than &Dgr;n1, said first glass layer comprising a low-dopant-content region; and a second glass layer radially surrounding the first layer, having a second maximum refractive index difference &Dgr;n3 greater than &Dgr;n2; and a low loss cladding surrounding said core region, wherein the non-linearity coefficient &ggr; is less than about 2 Wâˆ’1 kmâˆ’1, the effective area is greater than 45 &mgr;m2, a total dispersion for the fiber in a wavelength range of 1530 nm to 1565 nm is about 5 to 10 ps/nm/km, and a dispersion slope for the fiber at a wavelength of 1550 nm is less than or equal to about 0.06 ps/nm2/km.