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AssigneeNkt Photonics A/S
InventorsJens Kristian Lyngsø, Christian Jakobsen, Jesper Skov Gretlund, Harald R. Simonsen
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An optical fiber having an axial direction and a cross section perpendicular to the axial direction, and a method and preform for producing such an optical fiber. The optical fiber is adapted to guide light at a wavelength λ, and includes a core region, an inner cladding region surrounding said core region, and at least one of a first type of feature including a void and a surrounding first silica material. The core, the inner cladding region and the first type of feature extends along said axial direction over at least a part of the length of the optical fiber. The first silica material has a first chlorine concentration of about 300 ppm or less.
A preform configured for fabricating an optical fiber adapted to guide light at a wavelength λ, the preform comprising a hollow core part and an inner cladding part arranged to provide a hollow core region and a surrounding inner cladding region, respectively, in a fabricated optical fiber,
A preform configured for fabricating an optical fiber, the preform comprising a hollow core part and an inner cladding part surrounding said hollow core part, said preform comprising a plurality of tubes arranged in a stack, wherein said tubes comprise a silica material with Chlorine content below 300 ppm.
Dependencies are inferred from the claim text.