Fujikura Limited

Kenji Yamashiro

Koichi Harada

Ryo Maruyama

Munehisa Fujimaki

Hiroyuki Sawano

Takahiro Hamada

Yukinari Shirako

Shunichirou Hirafune

Miryo Kashiwazaki

A method for manufacturing an optical fiber, the method includes: exposing a bare fiber formed of glass and having a temperature of 500° C. to 1,500° C. to a gas in which a moisture content is controlled to 2 to 20 g/m; applying an uncured resin to an outer periphery of the bare fiber; and curing the resin to form a coating layer.

Method for manufacturing an optical fiber

An optical fiber includes a glass portion, a primary coating layer, and a secondary coating layer. In the optical fiber, a value of microbend loss characteristic factor Fis 6.1 ([GPa&#xb7;&#x3bc;m/rad) or less when represented by,where Fis geometry microbend loss characteristic and Fis optical microbend loss characteristic.

Optical fiber

An optical fiber includes a glass portion, a primary coating layer, and a secondary coating layer. In the optical fiber, a value of microbend loss characteristic factor Fis 2.6 ([GPa&#xb7;&#x3bc;m&#xb7;dB/turn]&#xb7;10) or less, when represented byby using geometry microbend loss characteristic Fand optical microbend loss characteristic F.

A treatment method for an optical fiber including accommodating an optical fiber inside a treatment chamber; introducing a deuterium containing gas into the treatment chamber; and in a deuterium treatment step, exposing the optical fiber to atmosphere of the deuterium containing gas. In the deuterium treatment step, a deuterium concentration D in the treatment chamber during the deuterium treatment is calculated from an initial value A of a deuterium concentration in the deuterium containing gas inside the treatment chamber, a concentration B of oxygen in an ambient atmosphere of the treatment chamber, and a concentration C of oxygen in the deuterium containing gas inside the treatment chamber, and the deuterium concentration in the treatment chamber is controlled based on the deuterium concentration D calculated. Other gases such as hydrogen containing gas or nitrogen containing gas may also be used according to the invention.

Treatment method for optical fiber

A method of treating optical fiber includes at least a first step of creating a reduced-pressure atmosphere in a space which holds the optical fiber, and a second step of introducing to the space a deuterium-containing gas so as to expose the optical fiber to the gas.

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Sakura, Japan

Kenji Yamashiro