METHOD FOR MANUFACTURING OPTICAL FIBER PREFORM AND METHOD FOR MANUFACTURING OPTICAL FIBER

PROBLEM TO BE SOLVED: To provide a method for manufacturing an optical fiber preform and a method for manufacturing an optical fiber having desirable transmission characteristics in the whole wavelength region from about, 1,300 to 1,600 nm. SOLUTION: A first clad having the outer diameter D is depos...

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Bibliographische Detailangaben
1. Verfasser:	ISHIDA SADANORI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS CHEMISTRY GLASS JOINING GLASS TO GLASS OR OTHER MATERIALS MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES METALLURGY MINERAL OR SLAG WOOL OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHYSICS SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS SURFACE TREATMENT OF GLASS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for manufacturing an optical fiber preform and a method for manufacturing an optical fiber having desirable transmission characteristics in the whole wavelength region from about, 1,300 to 1,600 nm. SOLUTION: A first clad having the outer diameter D is deposited to surround a core having the outer diameter d by a vapor phase axial deposition method to form a porous core rod having >=4.0 D/d. Then the porous core rod is dehydrated to control the concentration of hydroxyl groups to