Patents by Inventor Hideya Moridaira
Hideya Moridaira 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).
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Patent number: 8789393Abstract: A porous layer is formed by depositing a silica glass particle around a core rod. The porous layer is dehydrated. The dehydrated porous layer is sintered under a decreased pressure until the dehydrated porous layer becomes a translucent glass layer containing a closed pore. The translucent glass layer is vitrified under an ambient atmosphere including an inert gas other than a helium gas.Type: GrantFiled: November 29, 2005Date of Patent: July 29, 2014Assignee: The Furukawa Electric Co., Ltd.Inventors: Nobuaki Orita, Akihiro Kanao, Hideya Moridaira
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Publication number: 20140050450Abstract: A porous layer is formed by depositing a silica glass particle around a core rod. The porous layer is dehydrated. The dehydrated porous layer is sintered under a decreased pressure until the dehydrated porous layer becomes a translucent glass layer containing a closed pore. The translucent glass layer is vitrified under an ambient atmosphere including an inert gas other than a helium gas.Type: ApplicationFiled: October 30, 2013Publication date: February 20, 2014Applicant: FURUKAWA ELECTRIC CO., LTD.Inventors: Nobuaki ORITA, Akihiro KANAO, Hideya MORIDAIRA
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Publication number: 20120118018Abstract: A porous layer is formed by depositing a silica glass particle around a core rod. The porous layer is dehydrated. The dehydrated porous layer is sintered under a decreased pressure until the dehydrated porous layer becomes a translucent glass layer containing a closed pore. The translucent glass layer is vitrified under an ambient atmosphere including an inert gas other than a helium gas.Type: ApplicationFiled: January 26, 2012Publication date: May 17, 2012Applicant: THE FURUKAWA ELECTRIC CO., LTD.Inventors: Nobuaki ORITA, Akihiro KANAO, Hideya MORIDAIRA
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Patent number: 8020411Abstract: A method of manufacturing a single mode optical fiber formed of a silica-based glass and including a glass part having a central core and a cladding region. The method including heating an optical fiber preform in a heating furnace including a first heater to melt the optical fiber preform, and fiber drawing an optical fiber from the molten optical fiber preform. The method further comprises continuously cooling the drawn optical fiber starting with a meniscus portion in which diameter is decreased from 90% of the preform diameter to 5% of the preform diameter to a portion where the drawn optical fiber has a temperature of 1,200° C. at a cooling rate of 1,000 to 3,000° C. /sec.Type: GrantFiled: August 8, 2005Date of Patent: September 20, 2011Assignee: The Furukawa Electric Co., Ltd.Inventors: Hideya Moridaira, Kazuhiko Kurusu, Yoshihiro Inoue
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Publication number: 20090272152Abstract: The present invention provides a method for manufacturing an optical fiber comprising the steps of forming a glass body containing a core, preparing a glass tube which will form a cladding portion, inserting the glass body into the glass tube, and collapsing the glass tube with the glass body by heating, wherein the method comprises a step of processing the glass tube such that it has at least one end tapered to which a pull is to be applied. The method may further comprise the steps of cleaning the outer surface of the glass tube, choosing the outer diameter of the glass body and the inner diameter of the glass tube such that the difference between the two diameters is not lower than 1.0 mm but not higher than 10.Type: ApplicationFiled: July 14, 2009Publication date: November 5, 2009Applicant: THE FURUKAWA ELECTRIC CO., LTD.Inventors: Hideya Moridaira, Masamitsu Uehara, Tamotsu Kamiya
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Patent number: 7164831Abstract: An optical fiber having a small increase in loss at a wavelength of approximately 1400 nm involved in a deuterium treatment is provided, and an evaluation method to decide whether an optical fiber is that having such a loss increase, and a fabrication method of an optical fiber having a small increase in such a loss are also provided. An optical fiber according to the present invention comprises a core composed of a silica glass doped with at least germanium and a cladding composed of a silica glass surrounding it. The optical fiber is exposed to an atmosphere containing hydrogen or deuterium to diffuse hydrogen molecules or deuterium molecules in the optical fiber, and after that, the outer periphery of the glass region of the optical fiber is etched to an outer diameter of 50 ?m, and then the electron spin density of PORs is 1×1013 spins/g or less when the glass region is measured by the electron-spin resonance method.Type: GrantFiled: July 12, 2005Date of Patent: January 16, 2007Assignee: The Furukawa Electric Co., Ltd.Inventors: Kazuhiko Kurusu, Hideya Moridaira, Yoshinori Ishida
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Patent number: 7142755Abstract: An optical fiber characterized by a cutoff wavelength of 1310 nm or less, a transmission loss of 0.40 dB/km or less at the wavelength of 1385 nm before hydrogen ageing, a transmission loss of 0.40 dB/km or less in the wavelength range of 1310 nm to 1625 nm after hydrogen ageing, and an electron spin density of the Non-Bridging Oxygen Hole Center of 1×1013 spins/g or less measured by the electron spin resonance method after the diameter of the optical fiber is made to be about 50 ?m by etching in diluted hydrofluoric acid, that having high reliability of hydrogen-proof characteristic suitable for WDM transmission in 1310 nm to 1625 nm and the method of evaluating the optical fiber are offered.Type: GrantFiled: May 19, 2005Date of Patent: November 28, 2006Assignee: The Furukawa Electric Co., Ltd.Inventors: Kazuhiko Kurusu, Hideya Moridaira, Masahide Kuwabara, Yoshinori Ishida
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Patent number: 7079736Abstract: An optical fiber having a length of one kilometer or more with average transmission loss at a wavelength of 1383 nm being less than average transmission loss at a wavelength of 1310 nm, wherein a maximum value of a transmission loss at the wavelength of 1383 nm of any one kilometer section along the entire length of the optical fiber does not exceed the average transmission loss at the wavelength of 1383 nm along the entire length of the optical fiber by 0.03 dB/km or more.Type: GrantFiled: June 30, 2003Date of Patent: July 18, 2006Assignee: The Furukawa Electric Co., Ltd.Inventors: Fumio Takahashi, Hideya Moridaira, Masahide Kuwabara, Yoshinori Ishida, Satoru Ise
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Publication number: 20060115913Abstract: A porous layer is formed by depositing a silica glass particle around a core rod. The porous layer is dehydrated. The dehydrated porous layer is sintered under a decreased pressure until the dehydrated porous layer becomes a translucent glass layer containing a closed pore. The translucent glass layer is vitrified under an ambient atmosphere including an inert gas other than a helium gas.Type: ApplicationFiled: November 29, 2005Publication date: June 1, 2006Applicant: THE FURUKAWA ELECTRIC CO., LTD.Inventors: Nobuaki Orita, Akihiro Kanao, Hideya Moridaira
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Publication number: 20060110112Abstract: An optical fiber having a length of 1 km or more with average transmission loss in a wavelength band of 1383 nm being less than average transmission loss in a wavelength band of 1310 nm, wherein a maximum value of any 1 km section loss in the wavelength band of 1383 nm does not exceed the average transmission loss by 0.03 dB/km or more.Type: ApplicationFiled: January 12, 2006Publication date: May 25, 2006Applicant: The Furukawa Electric Co., Ltd.Inventors: Fumio Takahashi, Hideya Moridaira, Masahide Kuwabara, Yoshinori Ishida, Masato Oku
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Publication number: 20060013546Abstract: An optical fiber having a small increase in loss at a wavelength of approximately 1400 nm involved in a deuterium treatment is provided, and an evaluation method to decide whether an optical fiber is that having such a loss increase, and a fabrication method of an optical fiber having a small increase in such a loss are also provided. An optical fiber according to the present invention comprises a core composed of a silica glass doped with at least germanium and a cladding composed of a silica glass surrounding it. The optical fiber is exposed to an atmosphere containing hydrogen or deuterium to diffuse hydrogen molecules or deuterium molecules in the optical fiber, and after that, the outer periphery of the glass region of the optical fiber is etched to an outer diameter of 50 ?m, and then the electron spin density of PORs is 1×1013 spins/g or less when the glass region is measured by the electron-spin resonance method.Type: ApplicationFiled: July 12, 2005Publication date: January 19, 2006Applicant: THE FURUKAWA ELECTRIC CO., LTD.Inventors: Kazuhiko Kurusu, Hideya Moridaira, Yoshinori Ishida
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Publication number: 20050274151Abstract: In a single mode optical fiber formed of a silica-based glass and including a glass part having a central core and a cladding region, the density of non bridging oxygen hole center in the glass part is not higher than 1.0×1014 spins/g in terms of the spin density measured by an electron spin resonance method.Type: ApplicationFiled: August 8, 2005Publication date: December 15, 2005Inventors: Hideya Moridaira, Kazuhiko Kurusu, Yoshihiro Inoue
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Patent number: 6954572Abstract: In a single mode optical fiber formed of a silica-based glass and including a glass part having a central core and a cladding region, the density of non bridging oxygen hole center in the glass part is not higher than 1.0×1014 spins/g in terms of the spin density measured by an electron spin resonance method.Type: GrantFiled: May 28, 2002Date of Patent: October 11, 2005Assignee: The Furukawa Electric Co., Ltd.Inventors: Hideya Moridaira, Kazuhiko Kurusu, Yoshihiro Inoue
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Publication number: 20050220430Abstract: An optical fiber characterized by a cutoff wavelength of 1310 nm or less, a transmission loss of 0.40 dB/km or less at the wavelength of 1385 nm before hydrogen ageing, a transmission loss of 0.40 dB/km or less in the wavelength range of 1310 nm to 1625 nm after hydrogen ageing, and an electron spin density of the Non-Bridging Oxygen Hole Center of 1×1013 spins/g or less measured by the electron spin resonance method after the diameter of the optical fiber is made to be about 50 ?m by etching in diluted hydrofluoric acid, that having high reliability of hydrogen-proof characteristic suitable for WDM transmission in 1310 nm to 1625 nm and the method of evaluating the optical fiber are offered.Type: ApplicationFiled: May 19, 2005Publication date: October 6, 2005Applicant: The Furukawa Electric Co., Ltd.Inventors: Kazuhiko Kurusu, Hideya Moridaira, Masahide Kuwabara, Yoshinori Ishida
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Publication number: 20050204780Abstract: A method of manufacturing an optical fiber, characterized by comprising the steps of forming a glass body having a core, forming a glass tube constituting a clad portion, inserting the glass body into the glass tube, forming the glass body integrally with the glass tube, finishing at least the extraction side end part of the glass tube in a tapered shape and washing the outer surface of the glass tube, characterized in that a difference between the outer diameter of the glass body and the inner diameter of the glass tube is 1.0 to 10.0 mm, and the inner diameter of a support tube fitted to one end of the glass tube is increased more than that of the glass tube or the extraction side end part of the glass tube is sealed with a tapered part provided at least on the inner surface thereof and a spacer is installed so that a clearance between the outer diameter of the glass body and the inner diameter of the glass tube becomes generally constant in the longitudinal direction.Type: ApplicationFiled: May 8, 2003Publication date: September 22, 2005Inventors: Hideya Moridaira, Masamitsu Uehara, Tamotsu Kamiya
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Patent number: 6944381Abstract: An optical fiber characterized by a cutoff wavelength of 1310 nm or less, a transmission loss of 0.40 dB/km or less at the wavelength of 1385 nm before hydrogen ageing, a transmission loss of 0.40 dB/km or less in the wavelength range of 1310 nm to 1625 nm after hydrogen ageing, and an electron spin density of the Non-Bridging Oxygen Hole Center of 1×1013spins/g or less measured by the electron spin resonance method after the diameter of the optical fiber is made to be about 50 ?m by etching in diluted hydrofluoric acid, that having high reliability of hydrogen-proof characteristic suitable for WDM transmission in 1310 nm to 1625 nm and the method of evaluating the optical fiber are offered.Type: GrantFiled: April 11, 2003Date of Patent: September 13, 2005Assignee: The Furukawa Electric Co., Ltd.Inventors: Kazuhiko Kurusu, Hideya Moridaira, Masahide Kuwabara, Yoshinori Ishida
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Patent number: 6901196Abstract: An optical fiber includes a first core having a relative refractive index difference of larger than 0.36%, and a cladding. The optical fiber has fiber cut-off wavelength ?c of more than 1350 nm, cable cut-off wavelength ?cc of less than 1285 nm, bending loss at a wavelength of 1625 nm of not more than 10 dB/km when wound at a diameter of 20 mm, transmission loss at a wavelength range of 1285 to 1625 nm of not more than 0.40 dB/km, transmission loss at a wavelength of 1383 nm less than transmission loss at a wavelength of 1310 nm, and difference in transmission loss at a wavelength of 1383 nm of not more than 0.04 dB/km before and after exposure to hydrogen. The lower bending loss of the optical fiber provides an optical fiber cable for use in a WDM transmission in wavelength range of 1285 to 1625 nm.Type: GrantFiled: June 21, 2004Date of Patent: May 31, 2005Assignee: The Furukawa Electric Co., Ltd.Inventors: Fumio Takahashi, Hideya Moridaira, Taeko Shibuta
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Publication number: 20040264896Abstract: An optical fiber includes a first core having a relative refractive index difference of larger than 0.36%, and a cladding. The optical fiber has fiber cut-off wavelength &lgr;c of more than 1350 nm, cable cut-off wavelength &lgr;cc of less than 1285 nm, bending loss at a wavelength of 1625 nm of not more than 10 dB/km when wound at a diameter of 20 mm, transmission loss at a wavelength range of 1285 to 1625 nm of not more than 0.40 dB/km, transmission loss at a wavelength of 1383 nm less than transmission loss at a wavelength of 1310 nm, and difference in transmission loss at a wavelength of 1383 nm of not more than 0.04 dB/km before and after exposure to hydrogen. The lower bending loss of the optical fiber provides an optical fiber cable for use in a WDM transmission in wavelength range of 1285 to 1625 nm.Type: ApplicationFiled: June 21, 2004Publication date: December 30, 2004Applicant: The Furukawa Electric Co., Ltd.Inventors: Fumio Takahashi, Hideya Moridaira, Taeko Shibuta
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Publication number: 20040136668Abstract: An optical fiber having a length of 1 km or more with average transmission loss in a wavelength band of 1383 nm being less than average transmission loss in a wavelength band of 1310 nm, wherein a maximum value of any 1 km section loss in the wavelength band of 1383 nm does not exceed the average transmission loss by 0.03 dB/km or more.Type: ApplicationFiled: June 30, 2003Publication date: July 15, 2004Applicant: The Furukawa Electric Co., Ltd.Inventors: Fumio Takahashi, Hideya Moridaira, Masahide Kuwabara, Yoshinori Ishida, Satoru Ise, Masato Oku
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Patent number: 6754421Abstract: An optical fiber for forming an optical transmission line suitable for the wavelength division multiplexing transmission by connecting to a positive dispersion optical fiber is provided. Outside a first glass layer (1), a second glass layer (2), a third glass layer (3) and a fourth glass layer (4) are sequentially disposed. The fourth glass layer (4) is to be a reference layer for a standard of a refractive index. A relative refractive index difference &Dgr;1 of the first glass layer to the reference layer is set to 1.6% to 2.6%, inclusive, a relative refractive index difference &Dgr;2 of the second glass layer is set to−0.65% to −0.4%, inclusive, and a relative refractive index difference &Dgr;3 of the third glass layer is set to 0.15% to 0.5%, inclusive.Type: GrantFiled: December 24, 2002Date of Patent: June 22, 2004Assignee: The Furukawa Electric Co., Ltd.Inventors: Iwao Shimotakahara, Hideya Moridaira, Junichi Tamura