Shin-etsu Chemical Co., Ltd.

Shinji Suzuki

Tadakatsu Shimada

Hideo Hirasawa

Masataka Watanabe

Waichi Yamamura

Yoshiaki Shimizu

Jiro Moriya

Mitsukuni Sakashita

Kazuhisa Hatayama

Minoru Taya

Takaaki Nagano

A method for manufacturing an optical fiber comprises setting a heating condition for heating a glass rod, which is a parent material of the optical fiber, and an elongating speed of the glass rod based on a prescribed numerical value which changes with a progress of elongation of the glass rod; heating and elongating the glass rod to generate a preform based on the heating condition and the elongating speed which are set by the setting; and drawing the preform to a filament-like form by further heating the preform to generate the optical fiber.

Optical fiber manufacture method, preform manufacture method, and preform manufacture apparatus

Method of making an optical fiber preform where a second elongation is based on a mark on a glass rod

A method for fusing an optical fiber preform comprises fusing the preform while blowing an oxidative gas against the preform to be fused from upper and lower directions of a fusing burner unit. An apparatus for carrying out the method includes a plurality of nozzles for preventing deposition of silica cloud, which are each set at an angle, &thgr;, of blowing the oxidative gas relative to the preform being drawn such 20&deg;&lE;&thgr;&lE;60&deg;.

Apparatus for preventing redeposition of silica during flame severing

Method and apparatus for fusing an optical fiber preform

Optical fiber manufacture method including elongating a preform in a vertical direction and a horizontal direction

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Annaka, Japan

Shinji Suzuki