Large effective area waveguide fiber
AssigneeCorning Incorporated
InventorMing-jun Li
Life of this patent
Estimating the term…
Abstract
Disclosed is a single mode optical waveguide fiber having a segmented core in which the central segment is a void. The shape and radial extent of the core segments are selected to provide a low dispersion slope together with large effective area and good bend resistance. Embodiments of the refractive index profiles in accord with the invention are shown having two or three annular segments surrounding the central void. The presence of the void provides the benefits of a negative relative index located centrally in the core region without the process difficulties associated with the use of dopants that decrease the refractive index of the waveguide fiber.
Claims24
An optical waveguide fiber comprising:
- a core region having a centerline, a radius, and including a first annular segment surrounding the centerline, the first annular segment having an inner radius, radius r0, defining a central void, the central void and the first annular segment each having a refractive index profile, a radius, and a relative index Δ%, and
- a clad glass layer, surrounding and in contact with the core region, having a refractive index profile and a minimum relative index Δ% of zero;
- wherein the radii of said core region are selected so that the optical waveguide fiber is single mode.
An optical waveguide fiber comprising:
- a core glass region having a centerline, a radius, the radius being selected to provide a single mode optical waveguide fiber, and at least a first annular layer which forms the boundary of a void along the centerline, the annular layer having a refractive index profile, and,
- a clad glass layer, surrounding and in contact with the core region surface, and, having a refractive index profile;
- wherein the single mode waveguide has a total dispersion slope less than about 0.08 ps/nm2-km, an induced attenuation under lateral load less than about 0.8 dB/m, and an effective area no less than about 70 μm2.
An optical waveguide fiber comprising:
- a core region having a centerline, a radius, and including a first annular segment surrounding the centerline, the first annular segment having an inner radius, radius r0, defining a central void, the central void and the first annular segment each having a refractive index profile, a radius, and a relative index Δ%, and
- a clad glass layer, surrounding and in contact with the core region, having a refractive index profile and a minimum relative index Δ% of zero;
- wherein the radii, the refractive index profiles, and the relative indexes of the core region are selected to provide a total dispersion slope less than about 0.08 ps/nm2-km over a wavelength range of about 1500 nm to 1600 nm.
Dependencies are inferred from the claim text.