Patent ID: 6650814
Filing Date: 2003-11-18
Classification: G02B,H04B

Abstract:
A dispersion and dispersion slope compensating optical fiber, comprising:a central core segment having a relative refractive index; a depressed moat segment on the periphery of the central core segment and having a relative refractive index that is less than the relative refractive index of the central core segment the relative refractive index of the depressed moat segment being less than âˆ’0.65%; an annular ring segment on the periphery of the depressed moat segment and having a relative refractive index that is less than the relative refractive index of the central core segment and greater that the relative refractive index of the depressed moat segment; and a cladding layer on the periphery of the annular ring segment and having a relative refractive index that is less that the relative refractive index of the annular ring segment and greater than the relative refractive index of the depressed moat segment; and wherein the relative refractive indices are selected to provide: negative dispersion at a wavelength of within the range of from about 1530 nm to about 1620 nm having a dispersion of about âˆ’240 ps/nm-km to about âˆ’140 ps/nm-km at a wavelength of about 1550 nm; negative dispersion slope at a wavelength of within the range of from about 1530 nm to about 1620 nm; a kappa value of within the range of about 40 to about 60 at a wavelength of about 1550 nm; and a fiber cut-off wavelength of less than about 1650 nm.