Patents by Inventor Derek Kita
Derek Kita 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: 11885677Abstract: We disclose an on-chip photonic spectroscopy system capable of dramatically improving the signal-to-noise ratio (SNR), dynamic range, and reconstruction quality of Fourier transform spectrometers. Secondly, we disclose a system of components that makes up a complete on-chip RF spectrum analyzer with low-cost and high-performance.Type: GrantFiled: April 12, 2021Date of Patent: January 30, 2024Assignee: Massachusetts Institute of TechnologyInventors: Derek Kita, Carlos Andres Rios Ocampo, Juejun Hu
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Patent number: 11885684Abstract: A method of performing Raman spectroscopy can include guiding a Raman pump beam with an optical fiber, where the Raman pump beam inducing fluorescence in the optical fiber. The beam and the fluorescence are coupled to a photonic integrated circuit (PIC) via the fiber. The beam is used to excite a sample in optical communication with the PIC via evanescent coupling and induces Raman scattering in the sample. The Raman scattering is collected via the PIC, and the Raman pump beam as well as the fluorescence is filtered out from the Raman scattering via the PIC.Type: GrantFiled: April 28, 2021Date of Patent: January 30, 2024Assignee: Massachusetts Institute of TechnologyInventors: Juejun Hu, Derek Kita, Jerome Michon
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Patent number: 11564565Abstract: An optical coherence tomography (OCT) engine includes a digital Fourier-Transform (dFT) spectrometer, a tunable delay line, and a high-speed optical phased array (OPA) scanner integrated onto a single chip. The broadband dFT spectrometer offers superior signal-to-noise ratio (SNR) and fine axial resolution; the tunable delay line ensures large imaging depth by circumventing sensitivity roll-off; and the OPA can scan the beams at GHz rates without moving parts. Unlike conventional spectrometers, the dFT spectrometer employs an optical switch network to retrieve spectral information in an exponentially scaling fashion—its performance doubles with every new optical switch added to the network. Moreover, it also benefits from the Fellgett's advantage, which provide a significant SNR edge over conventional spectrometers. The tunable delay line balances the path length difference between the reference and sample arms, avoiding any need to sample high-frequency spectral fringes.Type: GrantFiled: February 2, 2021Date of Patent: January 31, 2023Assignee: Massachusetts Institute of TechnologyInventors: Juejun Hu, Tian Gu, Derek Kita, Carlos Andres Rios Ocampo
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Patent number: 11313725Abstract: State-of-the-art portable Raman spectrometers use discrete free-space optical components that must be aligned well and that don't tolerate vibrations well. Conversely, the inventive spectrometers are made with monolithic photonic integration to fabricate some or all optical components on one or more planar substrates. Photonic integration enables dense integration of components, eliminates manual alignment and individual component assembly, and yields superior mechanical stability and resistance to shock or vibration. These features make inventive spectrometers especially suitable for use in high-performance portable or wearable sensors. They also yield significant performance advantages, including a large (e.g., 10,000-fold) increase in Raman scattering efficiency resulting from on-chip interaction of the tightly localized optical mode and the analyte and a large enhancement in spectral resolution and sensitivity resulting from the integration of an on-chip Fourier-transform spectrometer.Type: GrantFiled: July 14, 2020Date of Patent: April 26, 2022Assignee: Massachusetts Institute of TechnologyInventors: Tian Gu, Derek Kita, Juejun Hu
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Publication number: 20210307603Abstract: An optical coherence tomography (OCT) engine includes a digital Fourier-Transform (dFT) spectrometer, a tunable delay line, and a high-speed optical phased array (OPA) scanner integrated onto a single chip. The broadband dFT spectrometer offers superior signal-to-noise ratio (SNR) and fine axial resolution; the tunable delay line ensures large imaging depth by circumventing sensitivity roll-off; and the OPA can scan the beams at GHz rates without moving parts. Unlike conventional spectrometers, the dFT spectrometer employs an optical switch network to retrieve spectral information in an exponentially scaling fashion—its performance doubles with every new optical switch added to the network. Moreover, it also benefits from the Fellgett's advantage, which provide a significant SNR edge over conventional spectrometers. The tunable delay line balances the path length difference between the reference and sample arms, avoiding any need to sample high-frequency spectral fringes.Type: ApplicationFiled: February 2, 2021Publication date: October 7, 2021Inventors: Juejun Hu, Tian GU, Derek Kita, Carlos Andres Rios Ocampo
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Publication number: 20210262860Abstract: A method of performing Raman spectroscopy can include guiding a Raman pump beam with an optical fiber, where the Raman pump beam inducing fluorescence in the optical fiber. The beam and the fluorescence are coupled to a photonic integrated circuit (PIC) via the fiber. The beam is used to excite a sample in optical communication with the PIC via evanescent coupling and induces Raman scattering in the sample. The Raman scattering is collected via the PIC, and the Raman pump beam as well as the fluorescence is filtered out from the Raman scattering via the PIC.Type: ApplicationFiled: April 28, 2021Publication date: August 26, 2021Inventors: Juejun Hu, Derek Kita, Jerome Michon
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Publication number: 20210239526Abstract: We disclose an on-chip photonic spectroscopy system capable of dramatically improving the signal-to-noise ratio (SNR), dynamic range, and reconstruction quality of Fourier transform spectrometers. Secondly, we disclose a system of components that makes up a complete on-chip RF spectrum analyzer with low-cost and high-performance.Type: ApplicationFiled: April 12, 2021Publication date: August 5, 2021Applicant: Massachusetts Institute of TechnologyInventors: Derek Kita, Carlos Andres Rios Ocampo, Juejun Hu
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Patent number: 11041759Abstract: A method of performing Raman spectroscopy can include guiding a Raman pump beam with an optical fiber, where the Raman pump beam inducing fluorescence in the optical fiber. The beam and the fluorescence are coupled to a photonic integrated circuit (PIC) via the fiber. The beam is used to excite a sample in optical communication with the PIC via evanescent coupling and induces Raman scattering in the sample. The Raman scattering is collected via the PIC, and the Raman pump beam as well as the fluorescence is filtered out from the Raman scattering via the PIC.Type: GrantFiled: June 28, 2019Date of Patent: June 22, 2021Assignee: Massachusetts Institute of TechnologyInventors: Juejun Hu, Derek Kita, Jerome Michon
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Patent number: 10983003Abstract: We disclose an on-chip photonic spectroscopy system capable of dramatically improving the signal-to-noise ratio (SNR), dynamic range, and reconstruction quality of Fourier transform spectrometers. Secondly, we disclose a system of components that makes up a complete on-chip RF spectrum analyzer with low-cost and high-performance.Type: GrantFiled: December 11, 2019Date of Patent: April 20, 2021Assignee: Massachusetts Institute of TechnologyInventors: Derek Kita, Carlos Andres Rios Ocampo, Juejun Hu
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Publication number: 20210025756Abstract: State-of-the-art portable Raman spectrometers use discrete free-space optical components that must be aligned well and that don't tolerate vibrations well. Conversely, the inventive spectrometers are made with monolithic photonic integration to fabricate some or all optical components on one or more planar substrates. Photonic integration enables dense integration of components, eliminates manual alignment and individual component assembly, and yields superior mechanical stability and resistance to shock or vibration. These features make inventive spectrometers especially suitable for use in high-performance portable or wearable sensors. They also yield significant performance advantages, including a large (e.g., 10,000-fold) increase in Raman scattering efficiency resulting from on-chip interaction of the tightly localized optical mode and the analyte and a large enhancement in spectral resolution and sensitivity resulting from the integration of an on-chip Fourier-transform spectrometer.Type: ApplicationFiled: July 14, 2020Publication date: January 28, 2021Inventors: Tian GU, Derek Kita, Juejun HU
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Patent number: 10852190Abstract: A spectrometer includes an interferometer having a first interference arm and a second interference arm to produce interference patterns from incident light. At least one of the interference arms includes a series of cascaded optical switches connected by two (or more) waveguides of different lengths. Each optical switch directs the incident light into one waveguide or another, thereby changing the optical path length difference between the first interference arm and the second interference arm. This approach can be extended to multi-mode incident light by placing parallel interferometers together, each of which performs spectroscopy of one single mode in the multi-mode incident light. To maintain the compactness of the spectrometer, adjacent interferometers can share one interference arm.Type: GrantFiled: July 9, 2019Date of Patent: December 1, 2020Assignee: Massachusetts Institute of TechnologyInventors: Juejun Hu, Tian Gu, Hongtao Lin, Derek Kita, Anuradha M. Agarwal
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Publication number: 20200256728Abstract: We disclose an on-chip photonic spectroscopy system capable of dramatically improving the signal-to-noise ratio (SNR), dynamic range, and reconstruction quality of Fourier transform spectrometers. Secondly, we disclose a system of components that makes up a complete on-chip RF spectrum analyzer with low-cost and high-performance.Type: ApplicationFiled: December 11, 2019Publication date: August 13, 2020Applicant: Massachusetts Institute of TechnologyInventors: Derek Kita, Carlos Andres Rios Ocampo, Juejun Hu
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Patent number: 10571335Abstract: An apparatus for generating a spectral image includes a filter to receive incident light. The filter has a variable refractive index. The apparatus also includes a modulator, operably coupled to the filter, to modulate the variable refractive index of the filter so as to generate a plurality of optical patterns from the incident light. The plurality of optical patterns represents the spectral image and each optical pattern in the plurality of optical patterns corresponds to a different modulation of the variable refractive index. The apparatus further includes a detector, in optical communication with the filter, to detect the plurality of optical patterns.Type: GrantFiled: February 14, 2019Date of Patent: February 25, 2020Assignee: Massachusetts Institute of TechnologyInventors: Juejun Hu, Tian Gu, Kazumi Wada, Anuradha Murthy Agarwal, Lionel Cooper Kimerling, Derek Kita, Junying Li, Fleur Jacolien Fok
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Publication number: 20200003619Abstract: A method of performing Raman spectroscopy can include guiding a Raman pump beam with an optical fiber, where the Raman pump beam inducing fluorescence in the optical fiber. The beam and the fluorescence are coupled to a photonic integrated circuit (PIC) via the fiber. The beam is used to excite a sample in optical communication with the PIC via evanescent coupling and induces Raman scattering in the sample. The Raman scattering is collected via the PIC, and the Raman pump beam as well as the fluorescence is filtered out from the Raman scattering via the PIC.Type: ApplicationFiled: June 28, 2019Publication date: January 2, 2020Applicant: Massachusetts Institute of TechnologyInventors: Juejun Hu, Derek Kita, Jerome Michon
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Publication number: 20190331529Abstract: A spectrometer includes an interferometer having a first interference arm and a second interference arm to produce interference patterns from incident light. At least one of the interference arms includes a series of cascaded optical switches connected by two (or more) waveguides of different lengths. Each optical switch directs the incident light into one waveguide or another, thereby changing the optical path length difference between the first interference arm and the second interference arm. This approach can be extended to multi-mode incident light by placing parallel interferometers together, each of which performs spectroscopy of one single mode in the multi-mode incident light. To maintain the compactness of the spectrometer, adjacent interferometers can share one interference arm.Type: ApplicationFiled: July 9, 2019Publication date: October 31, 2019Inventors: Juejun Hu, Tian Gu, Hongtao Lin, Derek Kita, Anuradha M. Agarwal
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Publication number: 20190285473Abstract: An apparatus for generating a spectral image includes a filter to receive incident light. The filter has a variable refractive index. The apparatus also includes a modulator, operably coupled to the filter, to modulate the variable refractive index of the filter so as to generate a plurality of optical patterns from the incident light. The plurality of optical patterns represents the spectral image and each optical pattern in the plurality of optical patterns corresponds to a different modulation of the variable refractive index. The apparatus further includes a detector, in optical communication with the filter, to detect the plurality of optical patterns.Type: ApplicationFiled: February 14, 2019Publication date: September 19, 2019Inventors: Juejun Hu, Tian Gu, Kazumi Wada, Anuradha Murthy Agarwal, Lionel Cooper Kimerling, Derek Kita, Junying Li, Fleur Jacolien Fok