Patent ID: 6597848
Filing Date: 2003-07-22
Classification: C03B,G02B

Abstract:
A dispersion compensating optical fiber comprisinga core of transparent material surrounded by a cladding layer of transparent material having a refractive index nCL, said core including three radially adjacent regions, named in order of increasing radius, (a) a central core region having a maximum refractive index nC such that &Dgr;C is greater than +1.2%, (b) a moat region having a negative refractive index &Dgr;M, and (c) a ring region that includes a segment where refractive index increases with increasing radius to a peak ring refractive index of at least nR such that &Dgr;R>+0.15%, said segment being located at a peak ring radius that is at least 0.3 &mgr;m beyond said moat region, the refractive index profile of said fiber being such that the dispersion slope of said fiber is more negative than âˆ’0.15 ps/nm2Â·km at a wavelength of about 1550 nm, where &Dgr;C equals (nC2âˆ’nCL2)/2nC2, &Dgr;M equals (nMâˆ’nCL2)/2nM2 and &Dgr;R equals (nR2âˆ’nCL2)/2nR2.