Patents by Inventor Minghao Qi
Minghao Qi 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: 10615566Abstract: A tunable optical comb generator having a source laser configured to generate a continuous wave (CW) light at a first wavelength; and a microresonator coupled to the source laser and configured to receive the CW light and generate an optical signal having a plurality of output wavelengths corresponding to the first wavelength. The generator includes a microresonator tuning device coupled to the microresonator and configured to tune the microresonator to compensate the microresonator for wavelength shifts. A control circuit is coupled to the microresonator tuning device and configured to generate a control signal to control the microresonator tuning device based on the optical signal. Multiple microresonators in the form of microrings may be included to tune the generator. A heater coupled to the microresonators may be used to adjust the microresonators.Type: GrantFiled: February 24, 2015Date of Patent: April 7, 2020Assignee: Purdue Research FoundationInventors: Andrew Marc Weiner, Minghao Qi, Xiaoxiao Xue
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Patent number: 10444434Abstract: A semiconductor photonic device includes a substrate, facet(s), and optical coupler(s) associated with the facet(s). Each optical coupler can couple an electromagnetic field incident on the respective facet towards a buried waveguide as the electromagnetic field proceeds into the semiconductor photonic device. In some examples, each coupler has waveguides extending in a longitudinal direction and at least partly encapsulated within a cladding layer. In some examples, at least one waveguide tapers along its length. In some examples, at least one waveguide includes spaced-apart segments arranged to form a subwavelength grating (SWG) configured to entrain electromagnetic radiation.Type: GrantFiled: November 9, 2018Date of Patent: October 15, 2019Assignee: Purdue Research FoundationInventors: Minghao Qi, Min Teng, Kyunghun Han, Sangsik Kim, Ben Niu, Yun Jo Lee
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Publication number: 20190170936Abstract: A semiconductor photonic device includes a substrate, facet(s), and optical coupler(s) associated with the facet(s). Each optical coupler can couple an electromagnetic field incident on the respective facet towards a buried waveguide as the electromagnetic field proceeds into the semiconductor photonic device. In some examples, each coupler has waveguides extending in a longitudinal direction and at least partly encapsulated within a cladding layer. In some examples, at least one waveguide tapers along its length. In some examples, at least one waveguide includes spaced-apart segments arranged to form a subwavelength grating (SWG) configured to entrain electromagnetic radiation.Type: ApplicationFiled: November 9, 2018Publication date: June 6, 2019Inventors: Minghao Qi, Min Teng, Kyunghun Han, Sangsik Kim, Ben Niu, Yun Jo Lee
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Publication number: 20190154919Abstract: A semiconductor photonic device includes a substrate, facet(s), and optical coupler(s) associated with the facet(s). Each optical coupler can couple an electromagnetic field incident on the respective facet towards the substrate as the electromagnetic field proceeds into the semiconductor photonic device. In some examples, each coupler has waveguides extending in a longitudinal direction and at least partly encapsulated within corresponding cladding layers. A first waveguide extends farther from the facet in the longitudinal direction than does a second waveguide. The second waveguide is located farther above the silicon substrate than is the first waveguide. The coupler can include a stack of waveguide assemblies. A lower waveguide assembly can include one waveguide. An intermediate or upper waveguide assembly can include multiple waveguides. In some examples, at least one waveguide tapers along its length.Type: ApplicationFiled: November 20, 2018Publication date: May 23, 2019Inventors: Min Teng, Minghao Qi, Ben Niu, Justin Christopher Wirth, Sangsik Kim, Kyunghun Han, Yi Xuan, Yun Jo Lee
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Patent number: 10197731Abstract: A semiconductor photonic device includes a substrate, facet(s), and optical coupler(s) associated with the facet(s). Each optical coupler can couple an electromagnetic field incident on the respective facet towards the substrate as the electromagnetic field proceeds into the semiconductor photonic device. In some examples, each coupler has waveguides extending in a longitudinal direction and at least partly encapsulated within corresponding cladding layers. A first waveguide extends farther from the facet in the longitudinal direction than does a second waveguide. The second waveguide is located farther above the silicon substrate than is the first waveguide. The coupler can include a stack of waveguide assemblies. A lower waveguide assembly can include one waveguide. An intermediate or upper waveguide assembly can include multiple waveguides. In some examples, at least one waveguide tapers along its length.Type: GrantFiled: September 1, 2017Date of Patent: February 5, 2019Assignee: Purdue Research FoundationInventors: Min Teng, Minghao Qi, Ben Niu, Justin Christopher Wirth, Sangsik Kim, Kyunghun Han, Yi Xuan, Yun Jo Lee
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Patent number: 10126500Abstract: A semiconductor photonic device includes a substrate, facet(s), and optical coupler(s) associated with the facet(s). Each optical coupler can couple an electromagnetic field incident on the respective facet towards a buried waveguide as the electromagnetic field proceeds into the semiconductor photonic device. In some examples, each coupler has waveguides extending in a longitudinal direction and at least partly encapsulated within a cladding layer. In some examples, at least one waveguide tapers along its length. In some examples, at least one waveguide includes spaced-apart segments arranged to form a subwavelength grating (SWG) configured to entrain electromagnetic radiation.Type: GrantFiled: October 30, 2017Date of Patent: November 13, 2018Assignee: Purdue Research FoundationInventors: Minghao Qi, Min Teng, Kyunghun Han, Sangsik Kim, Ben Niu, Yun Jo Lee
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Publication number: 20180120504Abstract: A semiconductor photonic device includes a substrate, facet(s), and optical coupler(s) associated with the facet(s). Each optical coupler can couple an electromagnetic field incident on the respective facet towards a buried waveguide as the electromagnetic field proceeds into the semiconductor photonic device. In some examples, each coupler has waveguides extending in a longitudinal direction and at least partly encapsulated within a cladding layer. In some examples, at least one waveguide tapers along its length. In some examples, at least one waveguide includes spaced-apart segments arranged to form a subwavelength grating (SWG) configured to entrain electromagnetic radiation.Type: ApplicationFiled: October 30, 2017Publication date: May 3, 2018Inventors: Minghao Qi, Min Teng, Kyunghun Han, Sangsik Kim, Ben Niu, Yun Jo Lee
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Patent number: 9958608Abstract: A method of fabricating an optical device includes forming on a semiconductor substrate a first optical cavity, a second optical cavity, a first light guide and a second light guide. The first light guide has an input, and is optically coupled to the first optical cavity by a first coupling strength. In addition, the first light guide is optically coupled to the second optical cavity by a second coupling strength. The second light guide has an output, and is coupled to the second optical cavity by a third coupling strength. The first coupling strength is greater than the second coupling strength, and the third coupling strength is greater than the second coupling strength.Type: GrantFiled: June 19, 2017Date of Patent: May 1, 2018Assignee: Purdue Research FoundationInventors: Minghao Qi, Li Fan, Jian Wang, Leo Tom Varghese
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Publication number: 20180083414Abstract: A tunable optical comb generator having a source laser configured to generate a continuous wave (CW) light at a first wavelength; and a microresonator coupled to the source laser and configured to receive the CW light and generate an optical signal having a plurality of output wavelengths corresponding to the first wavelength. the generator includes a microresonator tuning device coupled to the microresonator and configured to tune the microresonator to compensate the microresonator for wavelength shifts. A control circuit iscoupled to the microresonator tuning device and configured to generate a control signal to control the microresonator tuning device based on the optical signal. Multiple microresonators in the form of microrings may be included to tune the generator. A heater coupled to the microresonators may be used to adjust the microresonators.Type: ApplicationFiled: February 24, 2015Publication date: March 22, 2018Applicant: PURDUE RESEARCH FOUNDATIONInventors: Andrew Marc Weiner, Minghao Qi, Xiaoxiao Xue
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Publication number: 20180067259Abstract: A semiconductor photonic device includes a substrate, facet(s), and optical coupler(s) associated with the facet(s). Each optical coupler can couple an electromagnetic field incident on the respective facet towards the substrate as the electromagnetic field proceeds into the semiconductor photonic device. In some examples, each coupler has waveguides extending in a longitudinal direction and at least partly encapsulated within corresponding cladding layers. A first waveguide extends farther from the facet in the longitudinal direction than does a second waveguide. The second waveguide is located farther above the silicon substrate than is the first waveguide. The coupler can include a stack of waveguide assemblies. A lower waveguide assembly can include one waveguide. An intermediate or upper waveguide assembly can include multiple waveguides. In some examples, at least one waveguide tapers along its length.Type: ApplicationFiled: September 1, 2017Publication date: March 8, 2018Inventors: Min Teng, Minghao Qi, Ben Niu, Justin Christopher Wirth, Sangsik Kim, Kyunghun Han, Yi Xuan, Yun Jo Lee
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Publication number: 20170285262Abstract: A method of fabricating an optical device includes forming on a semiconductor substrate a first optical cavity, a second optical cavity, a first light guide and a second light guide. The first light guide has an input, and is optically coupled to the first optical cavity by a first coupling strength. In addition, the first light guide is optically coupled to the second optical cavity by a second coupling strength. The second light guide has an output, and is coupled to the second optical cavity by a third coupling strength. The first coupling strength is greater than the second coupling strength, and the third coupling strength is greater than the second coupling strength.Type: ApplicationFiled: June 19, 2017Publication date: October 5, 2017Inventors: Minghao Qi, Li Fan, Jian Wang, Leo Tom Varghese
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Patent number: 9684127Abstract: An optical device includes a first optical cavity, a second optical cavity, a first light guide and a second light guide. Each of the first and second optical cavities is formed on a semiconductor substrate, and is configured to store light. The first light guide has an input, and is optically coupled to the first optical cavity by a first coupling strength. In addition, the first light guide is optically coupled to the second optical cavity by a second coupling strength. The second light guide has an output, and is coupled to the second optical cavity by a third coupling strength. The first coupling strength is greater than the second coupling strength, and the third coupling strength is greater than the second coupling strength.Type: GrantFiled: October 15, 2012Date of Patent: June 20, 2017Assignee: Purdue Research FoundationInventors: Minghao Qi, Li Fan, Jian Wang, Leo Tom Varghese
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Patent number: 9140853Abstract: An optical device includes first and second waveguides and a micro-ring. The first waveguide is optically coupled to the micro-ring and is separated from the micro-ring by a first gap having a first gap distance. The second waveguide has a supply port, an output port, and a coupling portion optically coupled to the micro-ring. The coupling portion is separated from the micro-ring by a second gap having a second distance. The second gap distance is larger than the first gap distance. The second waveguide and the micro-ring cooperate to form a filter having a stop band. The first gap distance is selected such that a first optical signal on the first waveguide having a first strength causes a first shift in the stop band such that a first wavelength is within the stop band, and wherein the second gap distance is selected such that a second optical signal on the second waveguide having the first strength causes a second or no shift in the stop band such that the first wavelength is outside of the stop band.Type: GrantFiled: October 15, 2012Date of Patent: September 22, 2015Assignee: Purdue Research FoundationInventors: Leo Tom Varghese, Minghao Qi, Li Fan, Jian Wang
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Publication number: 20150098674Abstract: An optical device includes first and second waveguides and a micro-ring. The first waveguide is optically coupled to the micro-ring and is separated from the micro-ring by a first gap having a first gap distance. The second waveguide has a supply port, an output port, and a coupling portion optically coupled to the micro-ring. The coupling portion is separated from the micro-ring by a second gap having a second distance. The second gap distance is larger than the first gap distance. The second waveguide and the micro-ring cooperate to form a filter having a stop band. The first gap distance is selected such that a first optical signal on the first waveguide having a first strength causes a first shift in the stop band such that a first wavelength is within the stop band, and wherein the second gap distance is selected such that a second optical signal on the second waveguide having the first strength causes a second or no shift in the stop band such that the first wavelength is outside of the stop band.Type: ApplicationFiled: October 15, 2012Publication date: April 9, 2015Inventors: Leo Tom Varghese, Minghao Qi, Li Fan, Jian Wang
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Publication number: 20150049982Abstract: An optical device includes a first optical cavity, a second optical cavity, a first light guide and a second light guide. Each of the first and second optical cavities is formed on a semiconductor substrate, and is configured to store light. The first light guide has an input, and is optically coupled to the first optical cavity by a first coupling strength. In addition, the first light guide is optically coupled to the second optical cavity by a second coupling strength. The second light guide has an output, and is coupled to the second optical cavity by a third coupling strength. The first coupling strength is greater than the second coupling strength, and the third coupling strength is greater than the second coupling strength.Type: ApplicationFiled: October 15, 2012Publication date: February 19, 2015Applicant: Purdue Research FoundationInventors: Minghao Qi, Li Fan, Jian Wang, Leo Tom Varghese
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Patent number: 7482277Abstract: A method of multilevel microfabrication processing is provided. The method includes providing a planar substrate that comprises one or more material layers. A first hardmask layer placed on top of the substrate is patterned into the lithographic pattern desired for the top lithographic layer. Subsequent hardmask layers are patterned until the number of hardmask layers equals the number of lithographic layers desired. The method includes etching into the substrate and stripping the top hardmask layer. Furthermore, the method includes alternating etching into the substrate and stripping the subsequent hardmask layers until the bottom hardmask layer is stripped.Type: GrantFiled: November 22, 2005Date of Patent: January 27, 2009Assignee: Massachusetts Institute of TechnologyInventors: Tymon Barwicz, Minghao Qi
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Publication number: 20060134905Abstract: A method of multilevel microfabrication processing is provided. The method includes providing a planar substrate that comprises one or more material layers. A first hardmask layer placed on top of the substrate is patterned into the lithographic pattern desired for the top lithographic layer. Subsequent hardmask layers are patterned until the number of hardmask layers equals the number of lithographic layers desired. The method includes etching into the substrate and stripping the top hardmask layer. Furthermore, the method includes alternating etching into the substrate and stripping the subsequent hardmask layers until the bottom hardmask layer is stripped.Type: ApplicationFiled: November 22, 2005Publication date: June 22, 2006Inventors: Tymon Barwicz, Minghao Qi