Patent ID: 6321016
Filing Date: 2001-11-20
Classification: G02B

Abstract:
An optical transmission fiber with a low non-linearity coefficient .gamma. and high effective area for use in an optical transmission system, comprising:a core region comprising:a glass inner core having a first maximum refractive index difference .DELTA.n1, a profile .alpha., and a radius r1;a first glass layer radially surrounding the inner core, having a refractive index difference .DELTA.n2 less than .DELTA.n1, and having an outer radius r2; anda second glass layer radially surrounding the first layer, having a second maximum refractive index difference .DELTA.n3 greater than .DELTA.n1, and having a width w,and a low loss cladding surrounding said core region,wherein said non-linearity coefficient .gamma. is less than about 2 W.sup.-1 km.sup.-1,characterized in that said refractive index difference .DELTA.n2 is lower in absolute value than 10% of said second maximum refractive index difference .DELTA.n3.