Patents by Inventor Yoshihiko Yoshida
Yoshihiko Yoshida 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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Publication number: 20150016771Abstract: An optical device includes a substrate having an electrooptical effect, and including an optical waveguide that guides light and a reflection groove having a bottom face that reflects light output from the optical waveguide; and a light-receiving element positioned above the reflection groove and fixed to the substrate. The light output from the optical waveguide into the reflection groove is reflected by the bottom face of the reflection groove while traveling through a space inside the reflection groove and is incident to the light-receiving element.Type: ApplicationFiled: July 11, 2014Publication date: January 15, 2015Inventors: Shinji MARUYAMA, Yoshihiko YOSHIDA, Tomoyuki ITO, Yoshihiro TAKAHASHI, Yoshinobu KUBOTA
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Patent number: 8831385Abstract: A mach-zehnder optical modulator includes a substrate having electrooptical effect, wherein: the substrate has an inputting waveguide portion, two intermediate waveguide portions, an outputting waveguide portion and a sub optical waveguide portion, the inputting waveguide portion being branched and coupled to the two intermediate waveguide portions, the two intermediate waveguide portions being combined and coupled to the outputting waveguide portion, the sub optical waveguide being provided on at least one side of the outputting optical waveguide portion and having a given distance from the outputting optical waveguide portion, the sub optical waveguide portion guiding an off-light emitted from a combining portion of the two intermediate waveguide portions; and a width of a starting point of the sub optical waveguide portion is larger than the outputting waveguide portion.Type: GrantFiled: January 10, 2011Date of Patent: September 9, 2014Assignee: Fujitsu Optical Components LimitedInventors: Masaki Sugiyama, Yoshihiko Yoshida, Yoshitada Kawashima, Toyokazu Sasaki
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Patent number: 8774563Abstract: A mach-zehnder optical modulator includes a substrate having electrooptical effect, wherein: the substrate has an inputting waveguide portion, two intermediate waveguide portions, an outputting waveguide portion and a sub optical waveguide portion, the inputting waveguide portion being branched and coupled to the two intermediate waveguide portions, the two intermediate waveguide portions being combined and coupled to the outputting waveguide portion, the sub optical waveguide being provided on at least one side of the outputting optical waveguide portion and having a given distance from the outputting optical waveguide portion, the sub optical waveguide portion guiding an off-light emitted from a combining portion of the two intermediate waveguide portions; and a width of a starting point of the sub optical waveguide portion is larger than the outputting waveguide portion.Type: GrantFiled: January 10, 2011Date of Patent: July 8, 2014Assignee: Fujitsu Optical Components LimitedInventors: Masaki Sugiyama, Yoshihiko Yoshida, Yoshitada Kawashima, Toyokazu Sasaki
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Publication number: 20130039612Abstract: An optical modulator comprises a substrate having an electro-optical effect, an optical waveguide formed in the substrate, a buffer layer provided above the optical waveguide, a semiconductor film provided above the buffer layer and having an aperture at a top of the optical waveguide, and an electrode provided above the buffer layer and electrically coupled to the semiconductor film.Type: ApplicationFiled: June 29, 2012Publication date: February 14, 2013Applicant: Fujitsu Optical Components LimitedInventors: Masaki Sugiyama, Yoshihiko Yoshida, Yoshinobu Kubota
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Patent number: 8374467Abstract: There is provided an optical device including a plurality of Mach-Zehnder modulators; and an input branching waveguide to split an input light so as to direct the resulting light to the plurality of Mach-Zehnder modulators; the Mach-Zehnder modulator comprising: a splitter coupled to the input branching waveguide; pair of waveguides coupled to the splitter; a combiner coupled to the pair of waveguides; and a signal electrode to apply signals to the pair of waveguides; wherein the splitters are disposed in a different orientation to each other.Type: GrantFiled: March 9, 2010Date of Patent: February 12, 2013Assignee: Fujitsu LimitedInventors: Masaki Sugiyama, Yoshihiko Yoshida, Akira Ishii
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Publication number: 20110194802Abstract: A mach-zehnder optical modulator includes a substrate having electrooptical effect, wherein: the substrate has an inputting waveguide portion, two intermediate waveguide portions, an outputting waveguide portion and a sub optical waveguide portion, the inputting waveguide portion being branched and coupled to the two intermediate waveguide portions, the two intermediate waveguide portions being combined and coupled to the outputting waveguide portion, the sub optical waveguide being provided on at least one side of the outputting optical waveguide portion and having a given distance from the outputting optical waveguide portion, the sub optical waveguide portion guiding an off-light emitted from a combining portion of the two intermediate waveguide portions; and a width of a starting point of the sub optical waveguide portion is larger than the outputting waveguide portion.Type: ApplicationFiled: January 10, 2011Publication date: August 11, 2011Applicant: Fujitsu Optical Components LimitedInventors: Masaki SUGIYAMA, Yoshihiko Yoshida, Yoshitada Kawashima, Toyokazu Sasaki
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Publication number: 20100232737Abstract: There is provided an optical device including a plurality of Mach-Zehnder modulators; and an input branching waveguide to split an input light so as to direct the resulting light to the plurality of Mach-Zehnder modulators; the Mach-Zehnder modulator comprising: a splitter coupled to the input branching waveguide; pair of waveguides coupled to the splitter; a combiner coupled to the pair of waveguides; and a signal electrode to apply signals to the pair of waveguides; wherein the splitters are disposed in a different orientation to each other.Type: ApplicationFiled: March 9, 2010Publication date: September 16, 2010Applicant: Fujitsu LimitedInventors: Masaki Sugiyama, Yoshihiko Yoshida, Akira Ishii
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Publication number: 20090269017Abstract: In An optical waveguide device, an output light reflected by a reflective groove can be monitored with a phase identical to a signal light. The optical waveguide device includes a substrate; an optical waveguide formed in a plane of the substrate and having a normal line with a predetermined angle relative to an optical axis of the optical waveguide; a reflective groove formed on the optical waveguide; and a monitor device to monitor an output light reflected by the reflective groove, wherein the reflective groove has as much depth as approaching a half or less of a mode field of a waveguided light propagated through the optical waveguide, to reflect a portion of the waveguided light.Type: ApplicationFiled: December 24, 2008Publication date: October 29, 2009Applicant: Fujitsu LimitedInventors: Shinji Maruyama, Yoshihiko Yoshida
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Patent number: 7079732Abstract: An optical device guides propagating light to exit from a desired side surface of a substrate while maintaining sufficient power within a limited size of the substrate and which facilitates adjustment of a mount position of a light-receiving element by increasing allowable tolerance of the mount position of the light-receiving element. The optical device has a substrate, a light propagating direction path formed in the substrate, and a reflection groove formed in an output-side of said light propagating direction path in the substrate. A side wall of the reflection groove is formed to become a convex reflection surface in relation to light which enters from the light propagating direction path, and the light output from the light propagating direction path undergoes total reflection on a side wall forming the reflection surface and lets the reflected light exit from a predetermined side surface of the substrate while enlarging an image.Type: GrantFiled: January 24, 2005Date of Patent: July 18, 2006Assignee: Fujitsu LimitedInventors: Shinji Maruyama, Tomoyuki Itou, Yoshihiro Takahashi, Yasuhiro Omori, Yoshihiko Yoshida, Masaharu Doi
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Publication number: 20050265663Abstract: An optical device guides propagating light to exit from a desired side surface of a substrate while maintaining sufficient power within a limited size of the substrate and which facilitates adjustment of a mount position of a light-receiving element by increasing allowable tolerance of the mount position of the light-receiving element. The optical device has a substrate, a light propagating direction path formed in the substrate, and a reflection groove formed in an output-side of said light propagating direction path in the substrate. A side wall of the reflection groove is formed to become a convex reflection surface in relation to light which enters from the light propagating direction path, and the light output from the light propagating direction path undergoes total reflection on a side wall forming the reflection surface and lets the reflected light exit from a predetermined side surface of the substrate while enlarging an image.Type: ApplicationFiled: January 24, 2005Publication date: December 1, 2005Applicant: Fujitsu LimitedInventors: Shinji Maruyama, Tomoyuki Itou, Yoshihiro Takahashi, Yasuhiro Omori, Yoshihiko Yoshida, Masaharu Doi
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Patent number: 6243416Abstract: An image is divided into blocks and coded by matching each block with a pattern having either a single region, or two or more regions defined by internal edges. The coded value of the block includes a pattern identifier, and a single pixel value for each region in the matching pattern. The coded image is decoded by constructing blocks divided into regions according to the pattern identifiers, and filling each region with the given single pixel value. The decoded blocks may be the same size as the blocks in the original image, or smaller, in which case the decoded image is reduced, or larger, in which case the decoded image is enlarged.Type: GrantFiled: February 4, 2000Date of Patent: June 5, 2001Assignee: Oki Data CorporationInventors: Nobuhito Matsushiro, Yoshihiko Yoshida