Patent ID: 6650813
Filing Date: 2003-11-18
Classification: C03B,G02B

Abstract:
A dispersion flattened fiber with high negative dispersion ranging from about âˆ’20 ps/nm/km to about âˆ’60 ps/nm/km comprising:a central core; ring-type cores and low refractive regions alternately formed outside the central core; a cladding formed surrounding the ring-type cores and the low refractive regions; and a coating formed outside the cladding so as to protect the central core, the ring-typed cores, the low refractive regions and the cladding, wherein a first ring-type core is formed within the cladding, a first low refractive region within the first ring-type core, a second ring-type core within the first low refractive region and a second low refractive region within the second ring-type core, and wherein the respective refractive indexes of the first and second low refractive region are lower than that of the cladding.