Patents by Inventor Masayoshi Hachiwaka
Masayoshi Hachiwaka has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 8606065Abstract: An optical fiber (10) includes: a core (11); a first cladding (12) surrounding the core (11) and having a lower refractive index than the core (11); and a second cladding (13) surrounding the first cladding (12) and having a lower refractive index than the first cladding (12). The first cladding (12) is doped with light attenuating dopant so that a concentration of the light attenuating dopant in the first cladding (12) increases from an inner surface of the first cladding (12) toward an outer surface of the first cladding (12).Type: GrantFiled: August 21, 2009Date of Patent: December 10, 2013Assignee: Mitsubishi Cable Industries, Ltd.Inventors: Haruo Ooizumi, Masatoshi Tanaka, Masayoshi Hachiwaka, Takaharu Kinoshita, Mamoru Hashimoto
-
Patent number: 8554036Abstract: A graded index multimode optical fiber (10) includes: a core (11) having an outside diameter of 45-65 ?m; a first cladding (12) surrounding the core (11); a second cladding (13) surrounding the first cladding (12) and made of a material having a lower refractive index than the first cladding (12); and a third cladding (14) surrounding the second cladding (13) and made of a material having a higher refractive index than the second cladding (13). The ratio of the outside diameter of the first cladding (12) to the outside diameter of the core (11) is 1.15-1.25.Type: GrantFiled: March 13, 2009Date of Patent: October 8, 2013Assignee: Mitsubishi Cable Industries, Ltd.Inventors: Haruo Ooizumi, Syuichi Kusunoki, Takaharu Kinoshita, Masayoshi Hachiwaka
-
Patent number: 8396340Abstract: An optical fiber includes: a core (1) having an outer diameter (D1) of greater than or equal to 8.2 ?m and less than or equal to 10.2 ?m; a first cladding (2) surrounding the core (1) and having an outer diameter (D2) of greater than or equal to 30 ?m and less than or equal to 45 ?m; a second cladding (3) surrounding the first cladding (2) and having a thickness (T) of greater than or equal to 7.4 ?m; and a support layer (4) surrounding the second cladding (3). The relative refractive index difference which is the ratio of the difference between the refractive index of the support layer (4) and that of the second cladding (3) to the refractive index of the support layer (4) is greater than or equal to 0.5%.Type: GrantFiled: November 13, 2008Date of Patent: March 12, 2013Assignee: Mitsubishi Cable Industries, Ltd.Inventors: Haruo Ooizumi, Masayoshi Hachiwaka, Takaharu Kinoshita, Muneaki Ichihara, Masataka Kon
-
Patent number: 8111962Abstract: An optical fiber connection structure which reduces MPI in the use of an optical fiber with a bend resistance improved by forming holes in the fiber, and a single-mode fiber which reduces MPI are provided. A second cladding portion of a second single-mode fiber 20 includes holes 28, and thus, the second single-mode fiber 20 has low bending loss. A portion of the second single-mode fiber 20 connected to a first single-mode fiber 10a is made solid by filling corresponding portions of the holes 28 over the length L0, and light in a mode LP11 is significantly attenuated in this portion, thereby reducing MPI.Type: GrantFiled: August 21, 2009Date of Patent: February 7, 2012Assignee: Mitsubishi Cable Industries, Ltd.Inventors: Masatoshi Tanaka, Masayoshi Hachiwaka, Haruo Ooizumi
-
Publication number: 20110176783Abstract: An optical fiber (10) includes: a core (11); a first cladding (12) surrounding the core (11) and having a lower refractive index than the core (11); and a second cladding (13) surrounding the first cladding (12) and having a lower refractive index than the first cladding (12). The first cladding (12) is doped with light attenuating dopant so that a concentration of the light attenuating dopant in the first cladding (12) increases from an inner surface of the first cladding (12) toward an outer surface of the first cladding (12).Type: ApplicationFiled: August 21, 2009Publication date: July 21, 2011Applicant: MITSUBISHI CABLE INDUSTRIES, LTD.Inventors: Haruo Ooizumi, Masatoshi Tanaka, Masayoshi Hachiwaka, Takaharu Kinoshita, Mamoru Hashimoto
-
Publication number: 20110176767Abstract: An optical fiber connection structure reducing MPI is provided. An intervening optical fiber 30 having a normalized frequency less than 2.405 and a length greater than or equal to 2 mm and less than or equal to 30 mm is interposed between a single-mode fiber 10a and a second single-mode fiber 20, and the second single-mode fiber 20 and the intervening optical fiber 30 are fused together. While transmission light is input through the first single-mode fiber 10a to the second single-mode fiber 20, a higher order mode is not generated in the second single-mode fiber 20.Type: ApplicationFiled: August 21, 2009Publication date: July 21, 2011Applicant: MITSUBISHI CABLE INDUSTRIES, LTD.Inventors: Masatoshi Tanaka, Masayoshi Hachiwaka, Haruo Ooizumi
-
Publication number: 20110002590Abstract: A graded index multimode optical fiber (10) includes: a core (11) having an outside diameter of 45-65 ?m; a first cladding (12) surrounding the core (11); a second cladding (13) surrounding the first cladding (12) and made of a material having a lower refractive index than the first cladding (12); and a third cladding (14) surrounding the second cladding (13) and made of a material having a higher refractive index than the second cladding (13). The ratio of the outside diameter of the first cladding (12) to the outside diameter of the core (11) is 1.15-1.25.Type: ApplicationFiled: March 13, 2009Publication date: January 6, 2011Inventors: Haruo Ooizumi, Syuichi Kusunoki, Takaharu Kinoshita, Masayoshi Hachiwaka
-
Publication number: 20100247048Abstract: An optical fiber includes: a core (1) having an outer diameter (D1) of greater than or equal to 8.2 ?m and less than or equal to 10.2 ?m; a first cladding (2) surrounding the core (1) and having an outer diameter (D2) of greater than or equal to 30 ?m and less than or equal to 45 ?m; a second cladding (3) surrounding the first cladding (2) and having a thickness (T) of greater than or equal to 7.4 ?m; and a support layer (4) surrounding the second cladding (3). The relative refractive index difference which is the ratio of the difference between the refractive index of the support layer (4) and that of the second cladding (3) to the refractive index of the support layer (4) is greater than or equal to 0.5%.Type: ApplicationFiled: November 13, 2008Publication date: September 30, 2010Applicant: Mitsubishi Cable Industries, Ltd.Inventors: Haruo Ooizumi, Masayoshi Hachiwaka, Takaharu Kinoshita, Muneaki Ichihara, Masataka Kon
-
Patent number: 7477821Abstract: A sealing composition for a photonic crystal fiber which comprises a compound represented by the following general formula (I), a compound represented by the following general formula (II) and a photo-polymerization initiator: Tf1-(O)a—(CH2)b—(CF2)m—(CH2)b—(O)a-Tf1 (I) Tf2-(O)a—(CH2)b—(CF2)m—(CH2)b—(O)a-Tf2 (II) wherein a represents 0 or 1, b represents 0 or 1, m represents an integer of 4 to 12, Tf1 represents a glycidyl group, and Tf2 represents CH2?CH—C(O)—; and a method for producing an optical fiber comprising filling air holes with above sealing composition and polishing and end surface; and an optical fiber having air holes in the inside which is produced by the method. The above sealing composition can achieve a low refractive index, and also is excellent in the low viscosity and heat resistance, and exhibits good filling characteristics and good polishing processability.Type: GrantFiled: October 6, 2005Date of Patent: January 13, 2009Assignees: Nagase Chemtex Corporation, Mitsubishi Cable Industries, Ltd.Inventors: Takafumi Iida, Masayoshi Hachiwaka
-
Publication number: 20080056655Abstract: A sealing composition for a photonic crystal fiber which comprises a compound represented by the following general formula (I), a compound represented by the following general formula (II) and a photo-polymerization initiator: Tf1-(O)a—(CH2)b—(CF2)m—(CH2)b—(O)a-Tf1 (I) Tf2-(O)a—(CH2)b—(CF2)m—(CH2)b—(O)a-Tf2 (II) wherein a represents 0 or 1, b represents 0 or 1, m represents an integer of 4 to 12, Tf1 represents a glycidyl group, and Tf2 represents CH2?CH—C(O)—; and a method for producing an optical fiber comprising filling air holes with above sealing composition and polishing and end surface; and an optical fiber having air holes in the inside which is produced by the method. The above sealing composition can achieve a low refractive index, and also is excellent in the low viscosity and heat resistance, and exhibits good filling characteristics and good polishing processability.Type: ApplicationFiled: October 6, 2005Publication date: March 6, 2008Applicants: Nagase Chemtex Corporation, Mitsubishi Cable Industries, LTD.Inventors: Takafumi Iida, Masayoshi Hachiwaka
-
Publication number: 20060062533Abstract: A photonic crystal fiber (1) has a fiber body including a core (2) and a cladding (3) which is provided to surround the core (2) and having a plurality of microscopic holes (3a) extending along the core (2). In the photonic crystal fiber (1), the openings of the plurality of microscopic holes (3a) of the cladding (3) located at an end of the fiber body are closed with blocking element (5) having a lower refractive index than the core (2), and thereafter the fiber end face is polished.Type: ApplicationFiled: June 2, 2003Publication date: March 23, 2006Applicant: Mitsubishi Cable Industries, Ltd.Inventors: Masayoshi Hachiwaka, Syunichiro Yamaguchi, Masotoshi Tanaka, Takashi Higashikubo
-
Patent number: 5852694Abstract: A high power fiber optic connector detachably attached to a connected cylindrical portion having an axial hole portion, a male screw portion, and a key way. This fiber optic connector is provided with a ferrule portion to be inserted into said axial hole portion, a cap nut to be engaged with said male screw portion, and a positioning key portion to be inserted into said key way. This key portion is fixed to be freely changed in a circumferential direction of said ferrule portion.Type: GrantFiled: July 8, 1997Date of Patent: December 22, 1998Assignee: Mitsubishi Cable Industries, Ltd.Inventors: Koji Kimura, Tokuji Hayashi, Masayoshi Hachiwaka, Takeshi Satake
-
Patent number: 5177808Abstract: The present invention provides an optical energy beam transmission path structure comprising at least one pair of optical fibers each having a connection end, and at least one fiber connector for connecting the connection ends of the paired fibers substantially coaxially. A small axial air gap is formed between the connection ends of the paired fibers, and an annular clearance is formed immediately around the connection end of the glass body of each fiber.Type: GrantFiled: October 29, 1990Date of Patent: January 5, 1993Assignees: Mitsubishi Jukogyo Kabushiki Kaisha, Mitsubishi Cable Industries, Ltd.Inventors: Takeshi Satake, Tokuji Hayashi, Masayoshi Hachiwaka, Masakatsu Kimura, Koichi Suzuki, Takeji Akutsu, Yoshimasa Tsukamoto, Isao Shirasu