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US 6,212,322 B1Granted
Positive dispersion low dispersion slope fiber
AssigneeCorning Incorporated
InventorsDaiping Ma, David Kinney Smith
Life of this patent
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Abstract
Disclosed is a single mode optical waveguide having a segmented core of at least two segments. The relative refractive index, the index profile and the radial dimensions of the core segments are selected to provide an optical waveguide fiber having properties suitable for a high performance telecommunication system operating in the wavelength window of about 1530 nm to 1570 nm. Embodiments of the invention having two, three and four segments are described.
Claims28
A single mode optical waveguide fiber comprising:
- a segmented core having at least two segments, each of the segments having a radius ri, a refractive index profile and a positive relative refractive index percent, Δi %, where i is equal to the number of segments,
- and a clad layer surrounding and in contact with the core, the clad layer having a refractive index nc;
- wherein, the ri, Δi %, and the refractive index profiles are selected to provide:
- zero dispersion wavelength in the range of about 1465 nm to 1530 nm;
- total dispersion at 1530 nm≧2 ps/nm-km;
- total dispersion slope <0.1 ps/nm2-km over the wavelength range 1530 nm to 1570 nm;
- effective area >60 μm2;
- and,
- mode field diameter, over the wavelength range of 1530 nm to 1570 nm, in the range of about 8.8 μm to 10.6 μm.
6 more elements
An optical waveguide fiber preform comprising:
- a central core region having a refractive index profile, said core region surrounded by and in contact with a clad layer, wherein said optical fiber preform is drawn to form a waveguide fiber, said preform central core region profile being configured to provide a waveguide fiber including;
- a segmented core having at least two segments, each of the segments having a radius ri, a refractive index profile and a relative refractive index percent, Δi %, where i is equal to the number of segments wherein the Δi % are positive,
- and a clad layer surrounding and in contact with the core, the clad layer having a refractive index nc;
- wherein, the ri, Δi %, and the refractive index profiles are selected to provide:
- zero dispersion wavelength in the range of about 1465 nm to 1530 nm;
- total dispersion at 1530 nm≧2 ps/nm-km;
- total dispersion slope <0.1 ps/nm2-km over the wavelength range 1530 nm to 1570 nm;
- effective area >60 μm2;
- and,
- mode field diameter, over the wavelength range of 1530 nm to 1570 nm, in the range of about 8.8 μm to 10.6 μm.
7 more elements
Dependencies are inferred from the claim text.