Patent ID: 6707976
Filing Date: 2004-03-16
Classification: G02B

Abstract:
An optical fiber communications system, comprising:at least one source of optical energy; an optical fiber cable including at least one positive dispersion optical fiber coupled to said at least one source, and at least one inverse dispersion optical fiber coupled to the positive dispersion optical fiber, wherein the inverse dispersion optical fiber includes a doped core region having an index of refraction n1, a cladding region having an index of refraction n2, a trench region between the doped core region and the cladding region and adjacent the doped core region, the trench region having an index of refraction n3, a first barrier region between the doped core region and the cladding region and adjacent the trench region, the first barrier region having an index of refraction n4, and a second barrier region between the doped core region and the cladding region and adjacent the first barrier region, the second barrier region having an index of refraction n5, wherein the inverse dispersion optical fiber has a chromatic dispersion between approximately âˆ’48 picosecond/(nanometer-kilometer) and âˆ’38 picosecond/(nanometer-kilometer) at a wavelength of 1550 nanometer (nm), wherein the splice loss between the positive dispersion fiber and said at least one inverse dispersion fiber is less than or equal to 0.40 dB at a wavelength of approximately 1550 nm, wherein the optical fiber has a median loss less than or equal to approximately 0.235 decibels (dB) per kilometer (dB/km) at 1550 nm; and at least one receiver coupled to the inverse dispersion optical fiber for receiving optical energy from the source.