Fujikura Limited

Manabu Kudou

Takashi Tsumanuma

Kazuyuki Hayashi

Kazuhiko Aikawa

A silica-based multi core optical fiber and a fabrication method for the same are provided, and include two or more cores of GeO&#x2014;SiOglass including an fluorine concentration not less than about 15 w % and a germanium concentration about 0.05 wt % to 2 wt %, in a core. A relative refractive index difference of a cladding and a core is not less than about 3%; and a ratio of a cladding diameter to a core diameter is about 1.02 to 3.0. A silica-based single core optical fiber is also provided, and includes a core having a germanium concentration not less than about 15 wt % and an fluorine concentration about 0.05 wt % to 2 wt %.

Silica-based single core optical fiber, silica-based multi core optical fiber, and fabrication method for the same

A multi-core optical fiber apparatus is disclosed. The multi-core optical fiber apparatus includes a cladding comprising quartz and a plurality of cores embedded in the cladding. Each of the cores has a diameter (D) ranging from 1.3 &#x3bc;m to 2.0 &#x3bc;m, a numerical aperture (NA) from 0.35 to 0.45 and a refractive index profile factor (&#x3b1;) from 2.0 to 4.0. A center of each of the cores has a germanium content of 20 wt % to 30 wt %. An interval between adjacent cores is 3.0 &#x3bc;m or more.

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Yotsukaido, Japan

Manabu Kudou