公开(公告)号：US5048923A

公开(公告)日：1991-09-17

申请号：US502204

申请日：1990-03-30

Applicant: Takashi Tsumanuma ,  Toshiyuki Tanaka ,  Naoki Shamoto ,  Katsuyuki Seto ,  Kazuo Sanada ,  Kouji Tanaka

Inventor： Takashi Tsumanuma ,  Toshiyuki Tanaka ,  Naoki Shamoto ,  Katsuyuki Seto ,  Kazuo Sanada ,  Kouji Tanaka

IPC: C03B37/012 ,  C03B37/028 ,  C03C13/04 ,  G02B6/06

CPC classification number: C03B37/01214 ,  C03B37/028 ,  C03C13/045 ,  G02B6/06 ,  C03B2201/08 ,  C03B2201/14 ,  C03B2203/22

Abstract: An image fiber preform for use in an image fiber according to the present invention includes a plurality of optical fiber strands, each optical fiber strand including a silica glass core which contains a dopant for increasing a refractive index of the core and a silica glass cladding surrounding the silica glass core, the silica glass cladding containing a fluorine dopant for decreasing a refractive index of the cladding, the cladding having an outer peripheral surface, and a quartz tube in which the optical fibers are closely arranged, wherein the cladding has a concentration of the fluorine dopant which decreases radially outward toward the outer peripheral surface of the cladding. in the present invention, an image fiber prepared from the image fiber preform and fabrication processes for the image fiber preform and the image fiber are provided.

公开(公告)号：US5033815A

公开(公告)日：1991-07-23

申请号：US523680

申请日：1990-04-27

Applicant: Takao Edahiro ,  Shiro Kurosaki ,  Minoru Watanabe

Inventor： Takao Edahiro ,  Shiro Kurosaki ,  Minoru Watanabe

IPC: C03B37/014 ,  C03B37/018 ,  C03C13/04 ,  G02B6/44 ,  G02B6/00

CPC classification number: G02B6/4492 ,  C03B37/014 ,  C03B37/018 ,  C03C13/045 ,  C03B2201/02 ,  C03B2201/08 ,  C03B2201/12 ,  C03B2201/14 ,  C03B2201/28 ,  C03B2201/30 ,  C03B2201/31 ,  C03B2201/32 ,  C03B2201/40 ,  C03B2201/42 ,  C03B2203/22

Abstract: An optical transmission fiber comprising (1) a core of high refractive index composed of SiO.sub.2 -based glass containing at least one of GeO.sub.2, As.sub.2 O.sub.3, Sb.sub.2 O.sub.5, SnO.sub.2, TiO.sub.2, PbO and Bi.sub.2 O.sub.3, (2) a clad of low refractive index composed of SiO.sub.2 -based glass containing at least one of F, F/B.sub.2 O.sub.3 and F/P.sub.2 O.sub.5, and (3) an outermost jacket layer composed of SiO.sub.2 and/or SiO.sub.2 -based glass containing at least one of Al.sub.2 O.sub.3, TiO.sub.2, ZrO.sub.2 and HfO.sub.2.