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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| creator | ISHIDA SADANORI |
| description | 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 |
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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 <=0.8 ppb by weight and changed into transparent to form a core rod. The transparent core rod is stretched by heating and a porous second clad is deposited around the stretched core rod by a vapor phase deposition method. The porous second clad is dehydrated to control the concentration of hydroxyl groups to <=50 ppm by weight and changed into transparent to manufacture the optical fiber preform. The optical fiber preform is drawn and kept in a heavy hydrogen atmosphere for a specified time.</description><edition>7</edition><language>eng</language><subject>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</subject><creationdate>2002</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20020705&DB=EPODOC&CC=JP&NR=2002187733A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,777,882,25545,76296</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20020705&DB=EPODOC&CC=JP&NR=2002187733A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>ISHIDA SADANORI</creatorcontrib><title>METHOD FOR MANUFACTURING OPTICAL FIBER PREFORM AND METHOD FOR MANUFACTURING OPTICAL FIBER</title><description>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 <=0.8 ppb by weight and changed into transparent to form a core rod. The transparent core rod is stretched by heating and a porous second clad is deposited around the stretched core rod by a vapor phase deposition method. The porous second clad is dehydrated to control the concentration of hydroxyl groups to <=50 ppm by weight and changed into transparent to manufacture the optical fiber preform. The optical fiber preform is drawn and kept in a heavy hydrogen atmosphere for a specified time.</description><subject>CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS</subject><subject>CHEMISTRY</subject><subject>GLASS</subject><subject>JOINING GLASS TO GLASS OR OTHER MATERIALS</subject><subject>MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES</subject><subject>METALLURGY</subject><subject>MINERAL OR SLAG WOOL</subject><subject>OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS</subject><subject>OPTICS</subject><subject>PHYSICS</subject><subject>SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS</subject><subject>SURFACE TREATMENT OF GLASS</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2002</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZIj0dQ3x8HdRcPMPUvB19At1c3QOCQ3y9HNX8A8I8XR29FFw83RyDVIICHIFKvFVcPRzUSBOCw8Da1piTnEqL5TmZlBycw1x9tBNLciPTy0uSExOzUstifcKMDIwMDK0MDc3NnY0JkoRAH02MeQ</recordid><startdate>20020705</startdate><enddate>20020705</enddate><creator>ISHIDA SADANORI</creator><scope>EVB</scope></search><sort><creationdate>20020705</creationdate><title>METHOD FOR MANUFACTURING OPTICAL FIBER PREFORM AND METHOD FOR MANUFACTURING OPTICAL FIBER</title><author>ISHIDA SADANORI</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_JP2002187733A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>2002</creationdate><topic>CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS</topic><topic>CHEMISTRY</topic><topic>GLASS</topic><topic>JOINING GLASS TO GLASS OR OTHER MATERIALS</topic><topic>MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES</topic><topic>METALLURGY</topic><topic>MINERAL OR SLAG WOOL</topic><topic>OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS</topic><topic>OPTICS</topic><topic>PHYSICS</topic><topic>SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS</topic><topic>SURFACE TREATMENT OF GLASS</topic><toplevel>online_resources</toplevel><creatorcontrib>ISHIDA SADANORI</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>ISHIDA SADANORI</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>METHOD FOR MANUFACTURING OPTICAL FIBER PREFORM AND METHOD FOR MANUFACTURING OPTICAL FIBER</title><date>2002-07-05</date><risdate>2002</risdate><abstract>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 <=0.8 ppb by weight and changed into transparent to form a core rod. The transparent core rod is stretched by heating and a porous second clad is deposited around the stretched core rod by a vapor phase deposition method. The porous second clad is dehydrated to control the concentration of hydroxyl groups to <=50 ppm by weight and changed into transparent to manufacture the optical fiber preform. The optical fiber preform is drawn and kept in a heavy hydrogen atmosphere for a specified time.</abstract><edition>7</edition><oa>free_for_read</oa></addata></record> |
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| subjects | 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 |
| title | METHOD FOR MANUFACTURING OPTICAL FIBER PREFORM AND METHOD FOR MANUFACTURING OPTICAL FIBER |
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