Patents by Inventor Touru Matsuura
Touru Matsuura 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: 7492975Abstract: The present invention provides an optical switch, an optical modulator, and a wavelength variable filter each of which has a simple configuration, which requires only a low driving voltage, which is independent of polarization, and which can operate at high speed. An optical switch according to the present invention includes a 3-dB coupler (16) placed on an input, a 3-dB coupler (17) placed on an output, and two optical waveguides connecting the input-side 3-dB coupler and the output-side 3-dB coupler together. The optical switch also includes a phase modulating section (18) that applies electric fields to one or both of the two optical waveguides. At least two optical waveguides are a crystal material including KTaxNb1-xO3 (0<x<1) and KxLi1-xTayNb1-yO3 (0<x<1, 0<y<1), or KTaxNb1-xO3 or KxLi1-xTayNb1-yO3.Type: GrantFiled: March 18, 2004Date of Patent: February 17, 2009Assignee: Nippon Telegraph and Telephone CorporationInventors: Seiji Toyoda, Kazuo Fujiura, Masahiro Sasaura, Koji Enbutsu, Makoto Shimokozono, Tadayuki Imai, Akiyuki Tate, Touru Matsuura, Takashi Kurihara, Hiroshi Fushimi
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Patent number: 7356227Abstract: An optical switch, an optical modulator, and a wavelength variable filter each have a simple configuration, which requires only a low driving voltage, which is independent of polarization, and which can operate at high speed. An optical switch includes a 3-dB coupler placed on an output, a 3-dB coupler placed on an output, and two optical waveguides connecting the input-side 3-dB coupler and the output-side 3-dB coupler together. The optical switch also includes a phase modulating section that applies electric fields to one or both of the two optical waveguides. At least two optical waveguides are a crystal material including KTaxNb1-xO3 (0<x<1) and KxLi1-xTayNb1-yO3 (0<x<1, 0<y<1), or KTaxNb1-xO3 or KxLi1-xTayNb1-yO3.Type: GrantFiled: October 4, 2006Date of Patent: April 8, 2008Assignee: Nippon Telegraph and Telephone CorporationInventors: Seiji Toyoda, Kazuo Fujiura, Masahiro Sasaura, Koji Enbutsu, Makoto Shimokozono, Tadayuki Imai, Akiyuki Tate, Touru Matsuura, Takashi Kurihara, Hiroshi Fushimi
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Patent number: 7340116Abstract: An optical switch, an optical modulator, and a wavelength variable filter each have a simple configuration, which requires only a low driving voltage, which is independent of polarization, and which can operate at high speed. An optical switch includes a 3-dB coupler placed on an output, a 3-dB coupler placed on an output, and two optical waveguides connecting the input-side 3-dB coupler and the output-side 3-dB coupler together. The optical switch also includes a phase modulating section that applies electric fields to one or both of the two optical waveguides. At least two optical waveguides are a crystal material including KTaxNb1-xO3 (0<x<1) and KxLi1-xTayNb1-yO3 (0<x<1, 0<y<1), or KTaxNb1-xO3 or KxLi1-xTayNb1-yO3.Type: GrantFiled: October 4, 2006Date of Patent: March 4, 2008Assignee: Nippon Telegraph and Telephone CorporationInventors: Seiji Toyoda, Kazuo Fujiura, Masahiro Sasaura, Koji Enbutsu, Makoto Shimokozono, Tadayuki Imai, Akiyuki Tate, Touru Matsuura, Takashi Kurihara, Hiroshi Fushimi
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Patent number: 7336854Abstract: An optical switch, an optical modulator, and a wavelength variable filter each have a simple configuration, which requires only a low driving voltage, which is independent of polarization, and which can operate at high speed. An optical switch includes a 3-dB coupler placed on an output, a 3-dB coupler placed on an output, and two optical waveguides connecting the input-side 3-dB coupler and the output-side 3-dB coupler together. The optical switch also includes a phase modulating section that applies electric fields to one or both of the two optical waveguides. At least two optical waveguides are a crystal material including KTaxNb1-xO3 (0<x<1) and KxLi1-xTayNb1-yO3 (0<x<1, 0<y<1), or KTaxNb1-xO3 or KxLi1-xTayNb1-yO3.Type: GrantFiled: October 4, 2006Date of Patent: February 26, 2008Assignee: Nippon Telegraph and Telephone CorporationInventors: Seiji Toyoda, Kazuo Fujiura, Masahiro Sasaura, Koji Enbutsu, Makoto Shimokozono, Tadayuki Imai, Akiyuki Tate, Touru Matsuura, Takashi Kurihara, Hiroshi Fushimi
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Publication number: 20070253659Abstract: An optical switch, an optical modulator, and a wavelength variable filter each have a simple configuration, which requires only a low driving voltage, which is independent of polarization, and which can operate at high speed. An optical switch includes a 3-dB coupler placed on an output, a 3-dB coupler placed on an output, and two optical waveguides connecting the input-side 3-dB coupler and the output-side 3-dB coupler together. The optical switch also includes a phase modulating section that applies electric fields to one or both of the two optical waveguides. At least two optical waveguides are a crystal material including KTaxNb1-xO3 (0<x<1) and KxLi1-xTayNb1-yO3 (0<x<1, 0<y<1), or KTaxNb1-xO3 or KxLi1-xTayNb1-yO3.Type: ApplicationFiled: October 4, 2006Publication date: November 1, 2007Applicant: Nippon Telegraph and Telephone CorporationInventors: Seiji Toyoda, Kazuo Fujiura, Masahiro Sasaura, Koji Enbutsu, Makoto Shimokozono, Tadayuki Imai, Akiyuki Tate, Touru Matsuura, Takashi Kurihara, Hiroshi Fushimi
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Publication number: 20070092181Abstract: An optical switch, an optical modulator, and a wavelength variable filter each have a simple configuration, which requires only a low driving voltage, which is independent of polarization, and which can operate at high speed. An optical switch includes a 3-dB coupler placed on an output, a 3-dB coupler placed on an output, and two optical waveguides connecting the input-side 3-dB coupler and the output-side 3-dB coupler together. The optical switch also includes a phase modulating section that applies electric fields to one or both of the two optical waveguides. At least two optical waveguides are a crystal material including KTaxNb1-xO3 (0<x<1) and KxLi1-xTayNb1-xO3 (0<x<1, 0<y<1), or KTaxNb1-xO3 or KxLi1-xTayNb1-yO3.Type: ApplicationFiled: October 4, 2006Publication date: April 26, 2007Applicant: Nippon Telegraph and Telephone CorporationInventors: Seiji Toyoda, Kazuo Fujiura, Masahiro Sasaura, Koji Enbutsu, Makoto Shimokozono, Tadayuki Imai, Akiyuki Tate, Touru Matsuura, Takashi Kurihara, Hiroshi Fushimi
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Publication number: 20070086691Abstract: An optical switch, an optical modulator, and a wavelength variable filter each have a simple configuration, which requires only a low driving voltage, which is independent of polarization, and which can operate at high speed. An optical switch includes a 3-dB coupler placed on an output, a 3-dB coupler placed on an output, and two optical waveguides connecting the input-side 3-dB coupler and the output-side 3-dB coupler together. The optical switch also includes a phase modulating section that applies electric fields to one or both of the two optical waveguides. At least two optical waveguides are a crystal material including KTaxNb1-xO3 (0<x<1) and KxLi1-xTayNb1-yO3 (0<x<2, 0<y<1), or KTaxNb1-xO3 or KxLi1-xTayNb1-yO3.Type: ApplicationFiled: October 4, 2006Publication date: April 19, 2007Applicant: Nippon Telegraph and Telephone CorporationInventors: Seiji Toyoda, Kazuo Fujiura, Masahiro Sasaura, Koji Enbutsu, Makoto Shimokozono, Tadayuki Imai, Akiyuki Tate, Touru Matsuura, Takashi Kurihara, Hiroshi Fushimi
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Publication number: 20070058896Abstract: The present invention provides an optical switch, an optical modulator, and a wavelength variable filter each of which has a simple configuration, which requires only a low driving voltage, which is independent of polarization, and which can operate at high speed. An optical switch according to the present invention includes a 3-dB coupler (16) placed on an output, a 3-dB coupler (17) placed on an output, and two optical waveguides connecting the input-side 3-dB coupler and the output-side 3-dB coupler together. The optical switch also includes a phase modulating section (18) that applies electric fields to one or both of the two optical waveguides. At least two optical waveguides are a crystal material including KTaxNb1-xO3 (0<x<1) and KxLi1-xTayNb1-yO3 (0<x<1, 0<y<1), or KTaxNb1-xO3 or KxLi1-xTayNb1-yO3.Type: ApplicationFiled: March 18, 2004Publication date: March 15, 2007Applicant: Nippon Telegraph and Telephone CorporationInventors: Seiji Toyoda, Kazuo Fujiura, Masahiro Sasaura, Koji Enbutsu, Makoto Shimokozono, Tadayuki Imai, Akiyuki Tate, Touru Matsuura, Takashi Kurihara, Hiroshi Fushimi