Patents by Inventor Ruizhi Shi
Ruizhi Shi 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: 10545288Abstract: A low loss high extinction ratio on-chip polarizer is disclosed. The polarizer is formed of a mode convertor followed by a mode squeezer and a dump waveguide, and may be configured to pass a desired waveguide mode and reject undesired modes. An embodiment is described that transmits a TE0 mode while blocking a TM0 mode by converting it into a higher-order TEn mode in a waveguide taper, squeezing out the TEn mode in a second waveguide taper to lessen its confinement, and then dumping the TEn mode in a waveguide bend that is configured to pass the TE0 mode.Type: GrantFiled: January 15, 2019Date of Patent: January 28, 2020Assignee: Elenion Technologies, LLCInventors: Yangjin Ma, Michael J. Hochberg, Ruizhi Shi, Yang Liu
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Publication number: 20200026002Abstract: A compact, low-loss and wavelength insensitive Y-junction for submicron silicon waveguides. The design was performed using FDTD and particle swarm optimization (PSO). The device was fabricated in a 248 nm CMOS line. Measured average insertion loss is 0.28±0.02 dB across an 8-inch wafer. The device footprint is less than 1.2 ?m×2 ?m, orders of magnitude smaller than MMI and directional couplers.Type: ApplicationFiled: December 10, 2018Publication date: January 23, 2020Inventors: Yang Liu, Yangjin Ma, Ruizhi Shi, Michael J. Hochberg, Yi Zhang, Shuyu Yang, Thomas Wetteland Baehr-Jones
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Publication number: 20200014566Abstract: An optical coherent receiver includes an optical hybrid (OH) configured to mix signal and reference light, and two back-end optical ports. An optical equalizing network interconnects two 180° OH output ports with the two back-end optical ports so that each back-end optical port receives light from each of the two OH output ports. Optical signals from each of the two back-end optical ports are converted to electrical signals that are fed to a differential amplifier. Adjusting coupling ratios and/or optical delays in the optical equalizing network reduces an OSNR penalty of a lower-bandwidth differential amplifier.Type: ApplicationFiled: September 19, 2019Publication date: January 9, 2020Inventors: Abdelrahman Ahmed, Ruizhi Shi, Alexander Rylyakov, Richard C. Younce
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Patent number: 10527793Abstract: When routing light on photonic integrated circuit (PIC) chips optical back-reflection and scattering can be highly detrimental to the desired application. Unused ports of optical devices, such as MMI, DC, Y-junction, PD, etc. are a cause for back-reflection and scattering, whereby the scattered light could get picked up by adjacent components, e.g. photodetectors. Management of stray light on the PIC is needed to prevent the undesired coupling between various components and to reduce noise. A dump taper may be used to guide and scatter stray light away from sensitive components or fully absorb the light while maintaining very low reflection from the taper. A doped dump taper may be used to passively absorb light reaching the unused port, thereby eliminating unwanted reflection and scattering. Alternatively, an undoped taper may be used to scatter light away from sensitive components while maintaining very low back-reflection.Type: GrantFiled: January 24, 2019Date of Patent: January 7, 2020Assignee: Elenion Technologies, LLCInventors: Yang Liu, Ruizhi Shi, Tal Galfsky
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Patent number: 10530126Abstract: Practical silicon-based light sources are still missing, despite the progress in germanium lasers, because both silicon and germanium are indirect-band semiconductors and inefficient at light generation. A tunable and single mode external cavity laser comprising: a gain medium for generating light between a reflective surface at one end of the gain medium; and a wavelength selective reflector at the other end of a laser cavity. A splitter disposed in the laser cavity includes an input port optically coupled to the gain medium, an input/output port optically coupled to the wavelength selective reflector, and an output port for outputting laser light at selected wavelengths. The wavelength selective reflector reflects light of one or more selected periodic wavelengths back to the gain medium via the input/output port, and passes light of non-selected wavelengths out of the laser cavity.Type: GrantFiled: December 27, 2017Date of Patent: January 7, 2020Assignee: Elenion Technologies, LLCInventors: Yangjin Ma, Yang Liu, Ruizhi Shi, Thomas Wetteland Baehr-Jones, Saeed Fathololoumi
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Patent number: 10514499Abstract: A photonic chip includes a device layer and a port layer, with an optical port located at the port layer. Inter-layer optical couplers are provided for coupling light between the device and port layers. The inter-layer couplers may be configured to couple signal light but block pump light or other undesired wavelength from entering the device layer, operating as an input filter. The port layer may accommodate other light pre-processing functions, such as optical power splitting, that are undesirable in the device layer.Type: GrantFiled: January 19, 2018Date of Patent: December 24, 2019Assignee: Elenion Technologies, LLCInventors: Ari Novack, Ruizhi Shi, Alexandre Horth, Ran Ding, Michael J. Hochberg
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Patent number: 10502895Abstract: A low loss high extinction ratio on-chip polarizer. The polarizer includes an input waveguide taper having an outer waveguiding region that widens in the direction of light propagation along at least a portion of the taper length, and a core waveguiding region that narrows in the direction of light propagation along at least a portion of the taper length, so as to selectively squeeze out light of undesired modes into the outer regions while preserving light of a desired mode in the waveguide core. An output filter section is provided to prevent light from reentering the output waveguide after being squeezed out. An integrated light absorber/deflector may be coupled to the outer waveguiding regions.Type: GrantFiled: September 10, 2018Date of Patent: December 10, 2019Assignee: Elenion Technologies, LLCInventors: Ruizhi Shi, Thomas Wetteland Baehr-Jones, Yangjin Ma, Yang Liu, Michael J. Hochberg, Matthew Akio Streshinsky, Alexandre Horth
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Patent number: 10461967Abstract: An optical coherent receiver includes an optical hybrid (OH) configured to mix signal and reference light, and two back-end optical ports. An optical equalizing network interconnects two 180° OH output ports with the two back-end optical ports so that each back-end optical port receives light from each of the two OH output ports. Optical signals from each of the two back-end optical ports are converted to electrical signals that are fed to a differential amplifier. Adjusting coupling ratios and/or optical delays in the optical equalizing network reduces an OSNR penalty of a lower-bandwidth differential amplifier.Type: GrantFiled: June 22, 2018Date of Patent: October 29, 2019Assignee: Elenion Technologies, LLCInventors: Abdelrahman Ahmed, Ruizhi Shi, Alexander Rylyakov, Richard C. Younce
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Patent number: 10444451Abstract: A light shield may be formed in photonic integrated circuit between integrated optical devices of the photonic integrated circuit. The light shield may be built by using materials already present in the photonic integrated circuit, for example the light shield may include metal walls and doped semiconductor regions. Light-emitting or light-sensitive integrated optical devices or modules of a photonic integrated circuit may be constructed with light shields integrally built in.Type: GrantFiled: January 3, 2019Date of Patent: October 15, 2019Assignee: Elenion Technologies, LLCInventors: Ruizhi Shi, Yang Liu, Ari Novack, Yangjin Ma, Kishore Padmaraju, Michael J. Hochberg
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Publication number: 20190278024Abstract: An optical device and a method of manufacturing an optical device, including a ridge waveguide second, and a strip-loaded ridge waveguide section, comprises applying two different protective layers and two separate etches at two different depths. The protective layers overlap to protect the same section of the optical device, and to limit the surfaces of optical device to exposure to multiple etches, except at edges where the protective layers overlap.Type: ApplicationFiled: May 29, 2019Publication date: September 12, 2019Inventors: Thomas Wetteland Baehr-Jones, Ruizhi Shi
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Publication number: 20190258005Abstract: An integrated optical device fabricated in the back end of line process located within the vertical span of the metal stack and having one or more advantages over a corresponding integrated optical device fabricated in the silicon on insulator layer.Type: ApplicationFiled: April 30, 2019Publication date: August 22, 2019Inventors: Ruizhi Shi, Michael J. Hochberg, Ari Jason Novack, Thomas Wetteland Baehr-Jones
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Publication number: 20190258002Abstract: A low loss high extinction ratio on-chip polarizer is disclosed. The polarizer includes an input waveguide taper having an outer waveguiding region that widens in the direction of light propagation along at least a portion of the taper length, and a core waveguiding region that narrows in the direction of light propagation along at least a portion of the taper length, so as to selectively squeeze out light of undesired modes into the outer regions while preserving light of a desired mode in the waveguide core. An integrated light absorber/deflector may be coupled to the outer waveguiding regions.Type: ApplicationFiled: March 14, 2019Publication date: August 22, 2019Inventors: Ruizhi Shi, Thomas Wetteland Baehr-Jones, Yangjin Ma, Yang Liu, Michael J. Hochberg, Matthew Akio Streshinsky
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Publication number: 20190227230Abstract: A photonic chip includes a device layer and a port layer, with an optical port located at the port layer. Inter-layer optical couplers are provided for coupling light between the device and port layers. The inter-layer couplers may be configured to couple signal light but block pump light or other undesired wavelength from entering the device layer, operating as an input filter. The port layer may accommodate other light pre-processing functions, such as optical power splitting, that are undesirable in the device layer.Type: ApplicationFiled: January 19, 2018Publication date: July 25, 2019Inventors: Ari Novack, Ruizhi Shi, Alexandre Horth, Ran Ding, Michael J. Hochberg
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Patent number: 10345520Abstract: An optical device and a method of manufacturing an optical device, including a ridge waveguide second, and a strip-loaded ridge waveguide section, comprises applying two different protective layers and two separate etches at two different depths. The protective layers overlap to protect the same section of the optical device, and to limit the surfaces of optical device to exposure to multiple etches, except at edges where the protective layers overlap.Type: GrantFiled: June 13, 2017Date of Patent: July 9, 2019Assignee: Elenion Technologies, LLCInventors: Thomas Wetteland Baehr-Jones, Ruizhi Shi
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Publication number: 20190199062Abstract: Practical silicon-based light sources are still missing, despite the progress in germanium lasers, because both silicon and germanium are indirect-band semiconductors and inefficient at light generation. A tunable and single mode external cavity laser comprising: a gain medium for generating light between a reflective surface at one end of the gain medium; and a wavelength selective reflector at the other end of a laser cavity. A splitter disposed in the laser cavity includes an input port optically coupled to the gain medium, an input/output port optically coupled to the wavelength selective reflector, and an output port for outputting laser light at selected wavelengths. The wavelength selective reflector reflects light of one or more selected periodic wavelengths back to the gain medium via the input/output port, and passes light of non-selected wavelengths out of the laser cavity.Type: ApplicationFiled: December 27, 2017Publication date: June 27, 2019Inventors: Yangjin Ma, Yang Liu, Ruizhi Shi, Thomas Wetteland Baehr-Jones, Saeed Fathololoumi
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Publication number: 20190179091Abstract: Two semiconductor chips are optically aligned to form a hybrid semiconductor device. Both chips have optical waveguides and alignment surface positioned at precisely-defined complementary vertical offsets from optical axes of the corresponding waveguides, so that the waveguides are vertically aligned when one of the chips is placed atop the other with their alignment surface abutting each other. The position of the at least one of the alignment surface in a layer stack of its chip is precisely defined by epitaxy. The chips are bonded at offset bonding pads with the alignment surfaces abutting in the absence of bonding material therebetween.Type: ApplicationFiled: January 16, 2019Publication date: June 13, 2019Inventors: David Henry Kinghorn, Ari Jason Novack, Holger N. Klein, Nathan A. Nuttall, Kishor V. Desai, Daniel J. Blumenthal, Michael J. Hochberg, Ruizhi Shi
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Patent number: 10317623Abstract: An integrated optical device fabricated in the back end of line process located within the vertical span of the metal stack and having one or more advantages over a corresponding integrated optical device fabricated in the silicon on insulator layer.Type: GrantFiled: September 18, 2018Date of Patent: June 11, 2019Assignee: Elenion Technologies, LLCInventors: Ruizhi Shi, Michael J. Hochberg, Ari Jason Novack, Thomas Wetteland Baehr-Jones
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Publication number: 20190170940Abstract: A low loss high extinction ratio on-chip polarizer is disclosed. The polarizer is formed of a mode convertor followed by a mode squeezer and a dump waveguide, and may be configured to pass a desired waveguide mode and reject undesired modes. An embodiment is described that transmits a TE0 mode while blocking a TM0 mode by converting it into a higher-order TEn mode in a waveguide taper, squeezing out the TEn mode in a second waveguide taper to lessen its confinement, and then dumping the TEn mode in a waveguide bend that is configured to pass the TE0 mode.Type: ApplicationFiled: January 15, 2019Publication date: June 6, 2019Inventors: Yangjin Ma, Michael J. Hochberg, Ruizhi Shi, Yang Liu
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Publication number: 20190137709Abstract: A light shield may be formed in photonic integrated circuit between integrated optical devices of the photonic integrated circuit. The light shield may be built by using materials already present in the photonic integrated circuit, for example the light shield may include metal walls and doped semiconductor regions. Light-emitting or light-sensitive integrated optical devices or modules of a photonic integrated circuit may be constructed with light shields integrally built in.Type: ApplicationFiled: January 3, 2019Publication date: May 9, 2019Inventors: Ruizhi Shi, Yang Liu, Ari Novack, Yangjin Ma, Kishore Padmaraju, Michael J. Hochberg
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Patent number: 10261254Abstract: A low loss high extinction ratio on-chip polarizer is disclosed. The polarizer includes an input waveguide taper having an outer waveguiding region that widens in the direction of light propagation along at least a portion of the taper length, and a core waveguiding region that narrows in the direction of light propagation along at least a portion of the taper length, so as to selectively squeeze out light of undesired modes into the outer regions while preserving light of a desired mode in the waveguide core. An integrated light absorber/deflector may be coupled to the outer waveguiding regions.Type: GrantFiled: October 5, 2017Date of Patent: April 16, 2019Assignee: Elenion Technologies, LLCInventors: Ruizhi Shi, Thomas Wetteland Baehr-Jones, Yangjin Ma, Yang Liu, Michael J. Hochberg, Matthew Akio Streshinsky