METHOD FOR MANUFACTURING OPTICAL FIBER PREFORM

PROBLEM TO BE SOLVED: To provide a method for manufacturing a rare earth element-doped optical fiber preform by which the PMD (polarization mode dispersion) can be reduced by an easy method and intrusion of bubbles can be prevented. SOLUTION: A quartz rod 2 doped with Er and Al is inserted into a qu...

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Hauptverfasser:	HATTORI KUNIHIRO, FUJITA MORIYUKI, OMAE TOSHIKAZU, YAMAMOTO TETSUYA, SEMIMOTO KENZO, YAMADA TOMOO
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 a rare earth element-doped optical fiber preform by which the PMD (polarization mode dispersion) can be reduced by an easy method and intrusion of bubbles can be prevented. SOLUTION: A quartz rod 2 doped with Er and Al is inserted into a quartz tube 1 and one end of the quartz tube 1 is sealed. The outer surface of the quartz tube 1 is heated with a burner 3 while the space between the quartz tube 1 and the quartz rod 2 is evacuated by use of a vacuum pump to collapse the quartz tube 1 to weld with the quartz rod 2. Heating is performed while controlling the temperature of the quartz rod 2 to a range from 1,000 to 1,400°C. COPYRIGHT: (C)2003,JPO