1
Takao Edahiro, Shiro Kurosaki, Minoru Watanabe: Process for preparing glass preform for optical fiber. Nippon Telegraph & Telephone Public Corporation, Sumitomo Electric, Sughrue Mion Zinn Macpeak and Seas, September 6, 1983: US04402720 (45 worldwide citation)

A process for producing a glass perform for optical transmission fibers, which includes supplying a gaseous silicon compound, ammonia or a gaseous nitrogen compound, and an oxygen-containing gas as starting gases into a high temperature zone to produce fine particles of SiOxNy glass and depositing t ...


2
Masao Kawachi, Satoru Tomaru, Takao Edahiro, Shoichi Suto: Fabrication method of single-mode optical fiber preforms. Nippon Telegraph & Telephone Public Corporation, Spencer & Kaye, August 24, 1982: US04345928 (35 worldwide citation)

A method of fabricating a single-mode optical fiber preform wherein a core torch produces fine glass particles eccentrically with respect to the center area of a flame stream, the core torch being so arranged as to blow the flame stream at an angle inclined to a seed rod. The porous glass body formi ...


3
Katsunari Okamoto, Takao Edahiro, Akio Kawana, Tetsuo Miya: Single mode optical fibers. Nippon Telegraph & Telephone Public Corporation, Blakely Sokoloff Taylor & Zafman, February 8, 1983: US04372647 (35 worldwide citation)

In a single mode optical fiber of the type comprising a core, a cladding surrounding the core and an intermediate layer, the refractive indices n1, n2 and n3 respectively of the core, the cladding and the intermediate layer are selected such that the following relations are satisfied


4
Masaharu Horiguchi, Takao Edahiro, Kunio Masuno, Tadashi Miyashita, Shiro Takahashi: Eccentric core optical waveguide. Nippon Telegraph & Telephone Public Corporation, Sughrue Rothwell Mion Zinn & Macpeak, April 13, 1976: US03950073 (29 worldwide citation)

An eccentric core optical waveguide comprising at least one glass core having relatively large refraction index disposed in an outer cylindrical glass jacket having larger diameter than that of the glass core and relatively small refraction index. The one or more glass core being so arranged as to m ...


5
Shoichi Suto, Fumiaki Hanawa, Masao Kawachi, Takao Edahiro, Motohiro Nakahara: Method of fabricating multi-mode optical fiber preforms. Nippon Telegraph & Telephone Public Corporation, Spencer & Kaye, January 4, 1983: US04367085 (27 worldwide citation)

A method of fabricating an optical fiber preform wherein a synthesizing torch is inclined between 10.degree. and 60.degree. with respect to the rotation axis of a seed rod. Moving the rod while rotating it, a glass raw material gas and a flame forming gas are blown out individually from the torch to ...


6
Takao Edahiro, Nobuo Inagaki, Shiro Kurosaki: Process for producing optical glass product. Nippon Telegraph & Telephone Public Corporation, Sumitomo Electric, Sughrue Mion Zinn Macpeak and Seas, July 9, 1985: US04528010 (19 worldwide citation)

A process for producing an optical glass product having a predetermined distribution of refractive index in the interior of the product is disclosed. The process comprises the steps of:


7
Takao Edahiro, Michihisa Kyoto, Gotaro Tanaka, Toru Kuwahara: Process for producing a glass preform for optical fiber. Nippon Telegraph & Telephone Public Corporation, Sumitomo Electric, Sughrue Mion Zinn Macpeak and Seas, July 6, 1982: US04338111 (12 worldwide citation)

A process for producing a preform for glass fiber for optical transmission by heating supply gases to form fine particles that are deposited on a rotating starter member to form an aggregate of fine glass particles which are then sintered to give a transparent vitreous material, characterized by a f ...


8
Katsunari Okamoto, Toshihito Hosaka, Yutaka Sasaki, Juichi Noda, Takao Edahiro: Single-polarization single-mode optical fiber. Nippon Telegraph & Telephone Public Corporation, Blakely Sokoloff Taylor & Zafman, November 6, 1984: US04480897 (11 worldwide citation)

A single-polarization single mode optical fiber of the type comprising an elliptical core, a pair of stress applying parts on both sides of the minor radius of the elliptical core for applying asymmetrical stress thereto and a clad embedding therein the core and the stress applying parts, the stress ...


9
Takao Edahiro, Gotaro Tanaka, Toru Kuwahara, Masaaki Yoshida: Process for producing high-purity silica glass. Nippon Telegraph & Telephone Public Corporation, Sumitomo Electric, Sughrue Mion Zinn Macpeak & Seas, September 27, 1983: US04406680 (10 worldwide citation)

A process for producing high-purity silica glass wherein glass-forming chlorides, hydrogen gas, oxygen and an inert gas are supplied from a glass burner, the chlorides are decomposed by flame oxidation to form fine grains of glass which are deposited on a starting member and the glass deposit is sin ...


10
Katsunari Okamoto, Takao Edahiro, Akio Kawana, Tetsuo Miya: Single mode optical fibers. Nippon Telegraph & Telephone Public, Charles W Helzer, June 25, 1985: US04525027 (9 worldwide citation)

In a single mode optical fiber comprising a core made of glass and a cladding surrounding the core and made of glass, when a difference .DELTA. between refractive indices n.sub.1 and n.sub.2 of the core and cladding is expressed by (n.sub.1 -n.sub.2)/(n.sub.1).times.100%, the refractive indices n.su ...