04804247 is referenced by 18 patents and cites 11 patents.

A quartz optical fiber comprising a core having a higher refractive index and made of pure quartz containing fluorine and phosphorus pentoxide and a cladding having a lower refractive index, a weight ratio of fluorine and phosphorus pentoxide in the core being larger than 1 (one), which is substantially free from unstability of the glass structure.

Title
Quartz glass optical fiber
Application Number
6/719952
Publication Number
4804247
Application Date
April 4, 1985
Publication Date
February 14, 1989
Inventor
Motohiro Nakahara
Mito
JP
Minoru Watanabe
Yokohama
JP
Shuzo Suzuki
Yokohama
JP
Michihisa Kyoto
Yokohama
JP
Agent
Cushman Darby & Cushman
Assignee
Nippon Telegraph & Telephone Corporation
JP
Sumitomo Electric
JP
IPC
C03C 25/02
G02B 6/10
G02B 6/16
G02B 6/02
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