Dispersion flattened fiber with high negative dispersion and method for the manufacture thereof
AssigneeKorea Telecom
InventorsJeong U Jeon, Young Tark Lee
Life of this patent
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Abstract
The invention relates to a dispersion flattened fiber (DFF) with high negative dispersion and a manufacturing method thereof. The dispersion flattened fiber comprises a central core; ring-type cores and low refractive regions alternately formed outside the central core; a cladding surrounding outside the ring-type cores and low refractive regions; and a coating outside the cladding. Since the dispersion flattened fiber has the dispersion of −20 to −60, it has a wide range of application and can be used for various purposes in the field of optical telecommunication.
Claims7
A dispersion flattened fiber with high negative dispersion ranging from about −20 ps/nm/km to about −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.
A dispersion flattened fiber with high negative dispersion ranging from about −20 ps/nm/km to about −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 first ring-type core has the same refractive index as the second ring-type core.
A dispersion flattened fiber with high negative dispersion ranging from about −20 ps/nm/km to about −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 first low refractive region has the same refractive index as the second low refractive region.
A dispersion flattened fiber with high negative dispersion ranging from about −20 ps/nm/km to about −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 Germanium or P is added to the central core and the first and the second ring-type cores.
Dependencies are inferred from the claim text.