Patent ID: 7903919

Claim:
A holey fiber comprising: a core region at a center of the holey fiber; a cladding region around the core region; a plurality of holes included in the cladding region, formed in layers around the core region, arranged to form a triangular lattice having a lattice constant Λ of 2.5 micrometers to 4.5 micrometers, and each having a diameter of d micrometers; and a wavelength dispersion value of −10 ps/nm/km to 10 ps/nm/km at a wavelength of 1050 nanometers when d/Λ is 0.4 to 0.47, wherein a number of the layers of the plurality of holes is equal to or less than seven, a confinement loss of the holey fiber at the wavelength of 1050 nanometers is equal to or less than 0.1 dB/km, an effective core area of the holey fiber at the wavelength of 1050 nanometers is equal to or larger than 10 μm 2 , and the holey fiber demonstrates a single-mode operation at a wavelength of 1000 nanometers.