High air fraction photonic band gap fibers

Optical waveguides – Optical fiber waveguide with cladding – Utilizing nonsolid core or cladding

Reexamination Certificate

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C385S123000, C385S122000, C385S141000

Reexamination Certificate

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11623359

ABSTRACT:
A photonic band gap fiber and method of making thereof is provided. The fiber is made of a non-silica-based glass and has a longitudinal central opening, a microstructured region having a plurality of longitudinal surrounding openings, and a jacket. The air fill fraction of the microstructured region is at least about 40%. The fiber may be made by drawing a preform into a fiber, while applying gas pressure to the microstructured region. The air fill fraction of the microstructured region is changed during the drawing.

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