Photonic bandgap fiber

Details Photonic bandgap fiber Photonic bandgap fiber

2011-07-12

2011-07-12

Doan, Jennifer (Department: 2874)

Optical waveguides

Optical fiber waveguide with cladding

Utilizing nonsolid core or cladding

C385S123000, C385S124000, C385S126000, C385S127000

Reexamination Certificate

active

07978947

ABSTRACT:
A photonic bandgap fiber includes a first core having a refractive index equal to or smaller than a refractive index of a cladding, a second core that is provided to surround the first core and has a refractive index smaller than the refractive index of the first core, the cladding that surrounds the second core, and a periodic structure portion that is provided in the cladding around the second core, and in which high-refractive index portions having a refractive index larger than the refractive index of the cladding form a periodic structure. The periodic structure is configured such that at least the propagation constant of the fundamental mode at a wavelength to be used is in a photonic bandgap, and the propagation constant of a higher-order mode at the wavelength to be used is outside of the photonic bandgap.

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