Sumitomo Electric Industries, Limited

Nippon Telegraph and Telephone Corporation

Masaharu Ooe

Yoichi Ishiguro

Gotaro Tanaka

Minoru Watanabe

Kohei Kobayashi

Nobuyuki Yoshizawa

Yutaka Katsuyama

Takashi Kogo

A surface of an optical fiber is coated by a method for coating a surface of an optical fiber with carbon comprising steps of introducing an optical fiber in a reaction chamber in the same direction as the flow of a coating raw material comprising carbon, hydrogen and halogen atoms and depositing on the surface of the optical fiber a carbon layer formed from the raw material by chemical vapor deposition, whereby the coated optical fiber has improved initial tensile strength and absorbs less hydrogen.

Method of forming a carbon coated optical fiber with co-current reactant

A hermetically coated optical fiber comprising a core made of glass, a cladding made of quartz glass surrounding the core the outermost layer of which glass contains fluorine, and a carbon layer surrounding the fluorine-containing glass layer, which optical fiber has good initial strength and fatigue characteristics.

Production of a hermetically coated optical fiber

Hermetically coated optical fiber

The invention relates to an optical fiber in which an optically functioning element is doped in at least the core, and the cladding is hermetically coated with carbon film and an optical fiber-type optically active device comprising: an optical fiber loop bundle constituted by a plurality of winds of an optical fiber hermetically coated with carbon and doped with an optionally functioning element; and beam introducing means for introducing a beam for pumping the optically functioning element into the optical fiber loop bundle.

Fiber optical amplifier

A surface of an optical fiber is coated by a method for coating a surface of an optical fiber with carbon comprising steps of introducing an optical fiber in a reaction chamber containing a coating raw material comprising carbon, hydrogen and halogen atoms and depositing on the surface of the optical fiber a carbon layer formed from the raw material by chemical vapor deposition, whereby the coated optical fiber has improved initial tensile strength and absorbs less hydrogen.

Method and apparatus for producing coated optical fiber

A process for fusion-splicing hermetically coated optical fibers each of which comprises an inorganic coating, an optical fiber glass and optionally an organic coating, which process comprises removing the inorganic coating, fusion-splicing the fibers and then coating a portion where the inorganic coating is removed with an inorganic material.

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Yokohama, Japan

Masaharu Ooe