Patents by Inventor Xiaoguang TU
Xiaoguang TU 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: 20240045139Abstract: A silicon photonics integration circuit includes a silicon substrate member; a RX sub-circuit formed in the silicon substrate member including multiple RX-input ports each having a mode size converter configured to receive an incoming light signal into one of multiple waveguides and multiple RX photo detectors coupled respectively to the multiple waveguides; and a TX sub-circuit formed in the silicon substrate member including one or more TX-input ports each having a mode size converter coupled to a first TX photo detector into one input waveguide, one or more 1×2 directional couplers each coupled between the input waveguide and two mod-input waveguides, multiple modulators coupled between respective multiple mod-input waveguides and multiple mod-output waveguides each being coupled to a second TX photo detector into one of multiple output waveguides, and multiple TX-output ports each having a mode size converter coupled to respective one of the multiple output waveguides.Type: ApplicationFiled: August 8, 2022Publication date: February 8, 2024Inventors: Xiaoguang TU, Masaki Kato, Yu Li
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Patent number: 11686991Abstract: A silicon optical modulator includes a silicon-on-insulator substrate and a first waveguide and a second waveguide arranged parallel to each other in the silicon-on-insulator substrate. The first waveguide includes a first PN junction. The second waveguide includes a second PN junction. At least one of the first PN junction and the second PN junction is disposed at an interface between a P type doped region and a N type doped region. The interface has an irregular shape that is not perpendicular to a plane in which the silicon-on-insulator substrate lies.Type: GrantFiled: August 9, 2021Date of Patent: June 27, 2023Assignee: MARVELL ASIA PTE LTDInventors: Xiaoguang Tu, Jie Lin, Masaki Kato
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Patent number: 11500229Abstract: A silicon optical modulator is fabricated to have a multi-slab structure between the contacts and the waveguide, imparting desirable performance attributes. A first slab comprises dopant of a first level. A second slab adjacent to (e.g., on top of) the first slab, comprises a doped region proximate to a contact, and an intrinsic region proximate to the waveguide. The parallel resistance properties and low overlap between the highly doped silicon and optical mode pigtail afforded by the multi-slab configuration, allow the modulator to operate with reduced optical losses and at a high speed. Embodiments may be implemented in a Mach-Zehnder interferometer or in micro-ring resonator modulator configuration.Type: GrantFiled: November 10, 2020Date of Patent: November 15, 2022Assignee: Marvell Asia Pte Ltd.Inventors: Xiaoguang Tu, Masaki Kato
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Patent number: 11409034Abstract: A silicon photonics integration circuit includes a silicon substrate member; a RX sub-circuit formed in the silicon substrate member including multiple RX-input ports each having a mode size converter configured to receive an incoming light signal into one of multiple waveguides and multiple RX photo detectors coupled respectively to the multiple waveguides; and a TX sub-circuit formed in the silicon substrate member including one or more TX-input ports each having a mode size converter coupled to a first TX photo detector into one input waveguide, one or more 1×2 directional couplers each coupled between the input waveguide and two mod-input waveguides, multiple modulators coupled between respective multiple mod-input waveguides and multiple mod-output waveguides each being coupled to a second TX photo detector into one of multiple output waveguides, and multiple TX-output ports each having a mode size converter coupled to respective one of the multiple output waveguides.Type: GrantFiled: January 29, 2020Date of Patent: August 9, 2022Assignee: MARVELL ASIA PTE LTD.Inventors: Xiaoguang Tu, Masaki Kato, Yu Li
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Patent number: 11086189Abstract: A silicon optical modulator includes two silicon waveguide branches coupled between a 2×2 splitter at a common input end and a 2×2 splitter at a common output end. The modulator further includes at least one of the two silicon waveguide branches comprising a ridge-shape having a central portion of a height sandwiched in a width direction by a first side portion and a second side portion throughout a length of the waveguide. The central portion in each cross-section plane thereof includes a p-region and a n-region separated by a continuous borderline to form an irregular shaped PN junction. The borderline is configured to have at least one section-line with a sloped angle relative to the width direction and have a total border-length substantially longer than the height. The p-region is in contact with the first side portion and the n-region is in contact with the second side portion.Type: GrantFiled: January 10, 2020Date of Patent: August 10, 2021Assignee: INPHI CORPORATIONInventors: Xiaoguang Tu, Jie Lin, Masaki Kato
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Publication number: 20210231866Abstract: A silicon photonics integration circuit includes a silicon substrate member; a RX sub-circuit formed in the silicon substrate member including multiple RX-input ports each having a mode size converter configured to receive an incoming light signal into one of multiple waveguides and multiple RX photo detectors coupled respectively to the multiple waveguides; and a TX sub-circuit formed in the silicon substrate member including one or more TX-input ports each having a mode size converter coupled to a first TX photo detector into one input waveguide, one or more 1×2 directional couplers each coupled between the input waveguide and two mod-input waveguides, multiple modulators coupled between respective multiple mod-input waveguides and multiple mod-output waveguides each being coupled to a second TX photo detector into one of multiple output waveguides, and multiple TX-output ports each having a mode size converter coupled to respective one of the multiple output waveguides.Type: ApplicationFiled: January 29, 2020Publication date: July 29, 2021Inventors: Xiaoguang TU, Masaki KATO, Yu LI
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Patent number: 11002913Abstract: An optical dispersion compensator integrated with a silicon photonics system including a first phase-shifter coupled to a second phase-shifter in parallel on the silicon substrate characterized in an athermal condition. The dispersion compensator further includes a third phase-shifter on the silicon substrate to the first phase-shifter and the second phase-shifter through two 2×2 splitters to form an optical loop. A second entry port of a first 2×2 splitter is for coupling with an input fiber and a second exit port of a second 2×2 splitter is for coupling with an output fiber. The optical loop is characterized by a total phase delay tunable via each of the first phase-shifter, the second phase-shifter, and the third phase-shifter such that a normal dispersion (>0) at a certain wavelength in the input fiber is substantially compensated and independent of temperature.Type: GrantFiled: March 30, 2020Date of Patent: May 11, 2021Assignee: INPHI CORPORATIONInventors: Xiaoguang Tu, Radhakrishnan L. Nagarajan, Masaki Kato
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Publication number: 20210116726Abstract: A silicon optical modulator is fabricated to have a multi-slab structure between the contacts and the waveguide, imparting desirable performance attributes. A first slab comprises dopant of a first level. A second slab adjacent to (e.g., on top of) the first slab, comprises a doped region proximate to a contact, and an intrinsic region proximate to the waveguide. The parallel resistance properties and low overlap between the highly doped silicon and optical mode pigtail afforded by the multi-slab configuration, allow the modulator to operate with reduced optical losses and at a high speed. Embodiments may be implemented in a Mach-Zehnder interferometer or in micro-ring resonator modulator configuration.Type: ApplicationFiled: November 10, 2020Publication date: April 22, 2021Inventors: Xiaoguang TU, Masaki KATO
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Patent number: 10852570Abstract: A silicon optical modulator is fabricated to have a multi-slab structure between the contacts and the waveguide, imparting desirable performance attributes. A first slab comprises dopant of a first level. A second slab adjacent to (e.g., on top of) the first slab, comprises a doped region proximate to a contact, and an intrinsic region proximate to the waveguide. The parallel resistance properties and low overlap between the highly doped silicon and optical mode pigtail afforded by the multi-slab configuration, allow the modulator to operate with reduced optical losses and at a high speed. Embodiments may be implemented in a Mach-Zehnder interferometer or in micro-ring resonator modulator configuration.Type: GrantFiled: October 16, 2019Date of Patent: December 1, 2020Assignee: INPHI CORPORATIONInventors: Xiaoguang Tu, Masaki Kato
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Publication number: 20200257050Abstract: An optical dispersion compensator integrated with a silicon photonics system including a first phase-shifter coupled to a second phase-shifter in parallel on the silicon substrate characterized in an athermal condition. The dispersion compensator further includes a third phase-shifter on the silicon substrate to the first phase-shifter and the second phase-shifter through two 2×2 splitters to form an optical loop. A second entry port of a first 2×2 splitter is for coupling with an input fiber and a second exit port of a second 2×2 splitter is for coupling with an output fiber. The optical loop is characterized by a total phase delay tunable via each of the first phase-shifter, the second phase-shifter, and the third phase-shifter such that a normal dispersion (>0) at a certain wavelength in the input fiber is substantially compensated and independent of temperature.Type: ApplicationFiled: March 30, 2020Publication date: August 13, 2020Inventors: Xiaoguang TU, Radhakrishnan L. NAGARAJAN, Masaki KATO
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Patent number: 10641965Abstract: An optical dispersion compensator integrated with a silicon photonics system including a first phase-shifter coupled to a second phase-shifter in parallel on the silicon substrate characterized in an athermal condition. The dispersion compensator further includes a third phase-shifter on the silicon substrate to the first phase-shifter and the second phase-shifter through two 2×2 splitters to form an optical loop. A second entry port of a first 2×2 splitter is for coupling with an input fiber and a second exit port of a second 2×2 splitter is for coupling with an output fiber. The optical loop is characterized by a total phase delay tunable via each of the first phase-shifter, the second phase-shifter, and the third phase-shifter such that a normal dispersion (>0) at a certain wavelength in the input fiber is substantially compensated and independent of temperature.Type: GrantFiled: December 9, 2019Date of Patent: May 5, 2020Assignee: INPHI CORPORATIONInventors: Xiaoguang Tu, Radhakrishnan L. Nagarajan, Masaki Kato
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Publication number: 20200110220Abstract: An optical dispersion compensator integrated with a silicon photonics system including a first phase-shifter coupled to a second phase-shifter in parallel on the silicon substrate characterized in an athermal condition. The dispersion compensator further includes a third phase-shifter on the silicon substrate to the first phase-shifter and the second phase-shifter through two 2×2 splitters to form an optical loop. A second entry port of a first 2×2 splitter is for coupling with an input fiber and a second exit port of a second 2×2 splitter is for coupling with an output fiber. The optical loop is characterized by a total phase delay tunable via each of the first phase-shifter, the second phase-shifter, and the third phase-shifter such that a normal dispersion (>0) at a certain wavelength in the input fiber is substantially compensated and independent of temperature.Type: ApplicationFiled: December 9, 2019Publication date: April 9, 2020Inventors: Xiaoguang TU, Radhakrishnan L. NAGARAJAN, Masaki KATO
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Patent number: 10527795Abstract: An optical dispersion compensator integrated with a silicon photonics system including a first phase-shifter coupled to a second phase-shifter in parallel on the silicon substrate characterized in an athermal condition. The dispersion compensator further includes a third phase-shifter on the silicon substrate to the first phase-shifter and the second phase-shifter through two 2×2 splitters to form an optical loop. A second entry port of a first 2×2 splitter is for coupling with an input fiber and a second exit port of a second 2×2 splitter is for coupling with an output fiber. The optical loop is characterized by a total phase delay tunable via each of the first phase-shifter, the second phase-shifter, and the third phase-shifter such that a normal dispersion (>0) at a certain wavelength in the input fiber is substantially compensated and independent of temperature.Type: GrantFiled: October 11, 2018Date of Patent: January 7, 2020Assignee: INPHI CORPORATIONInventors: Xiaoguang Tu, Radhakrishnan L. Nagarajan, Masaki Kato
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Publication number: 20190041580Abstract: An optical dispersion compensator integrated with a silicon photonics system including a first phase-shifter coupled to a second phase-shifter in parallel on the silicon substrate characterized in an athermal condition. The dispersion compensator further includes a third phase-shifter on the silicon substrate to the first phase-shifter and the second phase-shifter through two 2×2 splitters to form an optical loop. A second entry port of a first 2×2 splitter is for coupling with an input fiber and a second exit port of a second 2×2 splitter is for coupling with an output fiber. The optical loop is characterized by a total phase delay tunable via each of the first phase-shifter, the second phase-shifter, and the third phase-shifter such that a normal dispersion (>0) at a certain wavelength in the input fiber is substantially compensated and independent of temperature.Type: ApplicationFiled: October 11, 2018Publication date: February 7, 2019Inventors: Xiaoguang TU, Radhakrishnan L. NAGARAJAN, Masaki KATO
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Patent number: 10126629Abstract: An optical dispersion compensator integrated with a silicon photonics system including a first phase-shifter coupled to a second phase-shifter in parallel on the silicon substrate characterized in an athermal condition. The dispersion compensator further includes a third phase-shifter on the silicon substrate to the first phase-shifter and the second phase-shifter through two 2×2 splitters to form an optical loop. A second entry port of a first 2×2 splitter is for coupling with an input fiber and a second exit port of a second 2×2 splitter is for coupling with an output fiber. The optical loop is characterized by a total phase delay tunable via each of the first phase-shifter, the second phase-shifter, and the third phase-shifter such that a normal dispersion (>0) at a certain wavelength in the input fiber is substantially compensated and independent of temperature.Type: GrantFiled: August 3, 2017Date of Patent: November 13, 2018Assignee: INPHI CORPORATIONInventors: Xiaoguang Tu, Radhakrishnan L. Nagarajan, Masaki Kato
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Patent number: 9880404Abstract: An optical waveguide device includes a substrate; a lower cladding disposed on the substrate; a rib waveguide including a slab disposed on the lower cladding and a single rib disposed on the slab contiguous to the slab; and an upper cladding disposed on the rib waveguide. The rib waveguide includes a first doped region having a first electric conductivity exhibiting a P-type electric conductivity across the rib and the slab and a second doped region being contiguous to the first doped region and having a second electric conductivity exhibiting an N-type electric conductivity across the rib and the slab.Type: GrantFiled: October 4, 2016Date of Patent: January 30, 2018Assignees: FUJIKURA LTD., AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCHInventors: Kensuke Ogawa, Kazuhiro Goi, Guo-Qiang Lo, Tsung-Yang Jason Liow, Xiaoguang Tu
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Patent number: 9581545Abstract: An optical sensing system may include a light separation element configured to separate an input light into a plurality of sliced lights and a first resonator configured to receive one sliced light of the plurality of sliced lights. An effective refractive index of the first resonator may be changeable in response to a change in a refractive index of a cladding of the first resonator, a second resonator coupled to the first resonator and a detector configured to measure an intensity of the sliced light, the intensity of the sliced light based on a difference between a resonant wavelength of the first resonator and a resonant wavelength of the second resonator. The difference between a resonant wavelength of the first resonator and a resonant wavelength of the second resonator may be based on the effective refractive index of the first resonator.Type: GrantFiled: October 8, 2013Date of Patent: February 28, 2017Assignee: Agency for Science, Technology and ResearchInventors: Junfeng Song, Xianshu Luo, Xiaoguang Tu, Qing Fang, Guo-Qiang Patrick Lo, Mingbin Yu
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Publication number: 20170023810Abstract: An optical waveguide device includes a substrate; a lower cladding disposed on the substrate; a rib waveguide including a slab disposed on the lower cladding and a single rib disposed on the slab contiguous to the slab; and an upper cladding disposed on the rib waveguide. The rib waveguide includes a first doped region having a first electric conductivity exhibiting a P-type electric conductivity across the rib and the slab and a second doped region being contiguous to the first doped region and having a second electric conductivity exhibiting an N-type electric conductivity across the rib and the slab.Type: ApplicationFiled: October 4, 2016Publication date: January 26, 2017Applicants: FUJIKURA LTD., AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCHInventors: Kensuke OGAWA, Kazuhiro GOI, Guo-Qiang LO, Tsung-Yang Jason LIOW, Xiaoguang TU
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Patent number: 9335263Abstract: An optical circuit for sensing a biological entity in a fluid and a method of configuring an optical circuit for sensing a biological entity in a fluid are provided. The optical circuit includes a sensing arrangement including a reference arm having a reference waveguide and a sensing arm having a waveguide; wherein lengths of the reference waveguide and the waveguide are configured in accordance with a temperature dependency reduction criterion.Type: GrantFiled: September 20, 2012Date of Patent: May 10, 2016Assignee: Agency for Science, Technology and ResearchInventors: Xiaoguang Tu, Tsung-Yang Liow, Mingbin Yu, Guo-Qiang Lo
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Patent number: 9329415Abstract: According to embodiments of the present invention, a method for forming an optical modulator is provided. The method includes providing a substrate, implanting dopants of a first conductivity type into the substrate to form a first doped region, implanting dopants of a second conductivity type into the substrate to form a second doped region, wherein a portion of the second doped region is formed over and overlaps with a portion of the first doped region to form a junction between the respective portions of the first doped region and the second doped region, and wherein a remaining portion of the second doped region is located outside of the junction, and forming a ridge waveguide, wherein the ridge waveguide overlaps with at least a part of the junction.Type: GrantFiled: November 5, 2013Date of Patent: May 3, 2016Assignee: Agency for Science, Technology and ResearchInventors: Jun-Feng Song, Xianshu Luo, Xiaoguang Tu, Patrick Guo-Qiang Lo, Mingbin Yu