Patents by Inventor Chunshu Zhang
Chunshu Zhang 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: 11644305Abstract: An apparatus for monitoring strain in an optical chip in silicon photonics platform. The apparatus includes a silicon photonics substrate shared with the optical chip. Additionally, the apparatus includes an optical input configured in the silicon photonics substrate to supply an input signal of a single wavelength. The apparatus further includes a first waveguide arm and a second waveguide arm embedded in the silicon photonics substrate to form an on-chip interferometer. The second waveguide arm forms a delay line being disposed at a region in or adjacent to the optical chip. The on-chip interferometer is configured to generate an interference pattern serving as an indicator of strain distributed at the region in or adjacent to the optical chip. The interference pattern is caused by a temperature-independent phase shift at the single wavelength of the interferometer between the first waveguide arm and the second waveguide arm.Type: GrantFiled: June 9, 2021Date of Patent: May 9, 2023Assignee: MARVELL ASIA PTE LTDInventors: Chunshu Zhang, Jie Lin, Masaki Kato
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Publication number: 20220397388Abstract: An apparatus for monitoring strain in an optical chip in silicon photonics platform. The apparatus includes a silicon photonics substrate shared with the optical chip. Additionally, the apparatus includes an optical input configured in the silicon photonics substrate to supply an input signal of a single wavelength. The apparatus further includes a first waveguide arm and a second waveguide arm embedded in the silicon photonics substrate to form an on-chip interferometer. The second waveguide arm forms a delay line being disposed at a region in or adjacent to the optical chip. The on-chip interferometer is configured to generate an interference pattern serving as an indicator of strain distributed at the region in or adjacent to the optical chip. The interference pattern is caused by a temperature-independent phase shift at the single wavelength of the interferometer between the first waveguide arm and the second waveguide arm.Type: ApplicationFiled: June 9, 2021Publication date: December 15, 2022Inventors: Chunshu Zhang, Jie Lin, Masaki Kato
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Patent number: 10911845Abstract: A system and method for a tunable optical delay line. The tunable optical delay line comprises a coarse delay portion that provides a coarse delay amount, the coarse delay portion including a coarse delay selection element in conjunction with a coarse delay element, the coarse delay selection element incorporated on-chip into a photonic integrated circuit (IC) component, the coarse delay element being disposed off-chip of the photonic IC component and interconnected with the coarse delay selection element; and a fine delay element that provides a fine delay amount, the fine delay element interconnected in series with the coarse delay selection element, the optical delay line being tunable to a target delay amount by agglomerating the coarse and fine delay amounts.Type: GrantFiled: July 11, 2019Date of Patent: February 2, 2021Assignee: HUAWEI TECHNOLOGIES CO., LTD.Inventors: Hamid Mehrvar, Chunshu Zhang
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Patent number: 10901089Abstract: A coherent LIDAR method and apparatus are provided, in which two optical signals having a first frequency difference are reflected by an object. A difference in frequency between the corresponding received and reflected signals is determined. The frequency difference between the reflected signals differs from the first frequency difference due to Doppler effects. The object velocity is determined based on a comparison between the first frequency difference and the frequency difference in the reflected signals. The emitted signals can be produced by modulating a common light source. The reflected signals are inherently mixed at the receiver and further processed. Distance to the object can be determined by pulsing the emitted signals and measuring a time of flight by detecting corresponding pulse edges in the reflected signals, or by using phase sweeping. The emitter can be implemented using an optical phased array.Type: GrantFiled: March 26, 2018Date of Patent: January 26, 2021Assignee: HUAWEI TECHNOLOGIES CO., LTD.Inventors: Chunshu Zhang, Patrick Dumais, Dominic John Goodwill
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Publication number: 20210014584Abstract: A system and method for a tunable optical delay line. The tunable optical delay line comprises a coarse delay portion that provides a coarse delay amount, the coarse delay portion including a coarse delay selection element in conjunction with a coarse delay element, the coarse delay selection element incorporated on-chip into a photonic integrated circuit (IC) component, the coarse delay element being disposed off-chip of the photonic IC component and interconnected with the coarse delay selection element; and a fine delay element that provides a fine delay amount, the fine delay element interconnected in series with the coarse delay selection element, the optical delay line being tunable to a target delay amount by agglomerating the coarse and fine delay amounts.Type: ApplicationFiled: July 11, 2019Publication date: January 14, 2021Applicant: HUAWEI TECHNOLOGIES CO., LTD.Inventors: Hamid MEHRVAR, Chunshu ZHANG
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Patent number: 10495794Abstract: A polarization insensitive optical phased array is provided, for LIDAR or other purposes. A polarization rotator splitter or two-dimensional grating coupler provides two components of co-polarized (e.g. TE-polarized) light. Each component can be routed to a separate optical phased array (OPA) component, and light output of one of the OPA components is rotated in polarization by use of a half wave plate. A polarization controller can receive and control the two components of co-polarized light and then passes the controlled light to the two OPA components. A single OPA component can also be used along with a controller which combines the two components of co-polarized light into a single output, passed to the single OPA component.Type: GrantFiled: December 12, 2017Date of Patent: December 3, 2019Assignee: HUAWEI TECHNOLOGIES CO., LTD.Inventors: Chunshu Zhang, Eric Bernier, Dominic John Goodwill
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Publication number: 20190293794Abstract: A coherent LIDAR method and apparatus are provided, in which two optical signals having a first frequency difference are reflected by an object. A difference in frequency between the corresponding received and reflected signals is determined. The frequency difference between the reflected signals differs from the first frequency difference due to Doppler effects. The object velocity is determined based on a comparison between the first frequency difference and the frequency difference in the reflected signals. The emitted signals can be produced by modulating a common light source. The reflected signals are inherently mixed at the receiver and further processed. Distance to the object can be determined by pulsing the emitted signals and measuring a time of flight by detecting corresponding pulse edges in the reflected signals, or by using phase sweeping. The emitter can be implemented using an optical phased array.Type: ApplicationFiled: March 26, 2018Publication date: September 26, 2019Applicant: Huawei Technologies Co., Ltd.Inventors: Chunshu ZHANG, Patrick DUMAIS, Dominic John GOODWILL
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Publication number: 20190179064Abstract: A polarization insensitive optical phased array is provided, for LIDAR or other purposes. A polarization rotator splitter or two-dimensional grating coupler provides two components of co-polarized (e.g. TE-polarized) light. Each component can be routed to a separate optical phased array (OPA) component, and light output of one of the OPA components is rotated in polarization by use of a half wave plate. A polarization controller can receive and control the two components of co-polarized light and then passes the controlled light to the two OPA components. A single OPA component can also be used along with a controller which combines the two components of co-polarized light into a single output, passed to the single OPA component.Type: ApplicationFiled: December 12, 2017Publication date: June 13, 2019Applicant: HUAWEI TECHNOLOGIES CO., LTD.Inventors: Chunshu ZHANG, Eric BERNIER, Dominic John GOODWILL
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Patent number: 10126572Abstract: A photonic platform based polarization controller providing a fixed target polarization is disclosed. The polarization controller has a polarization rotator splitter splitting the beam into first and second feeds corresponding to first and second orthogonal polarization components. A first Mach-Zehnder interferometer (MZI) stage provides a first phase delay between the first and second feeds based on a first control signal, and a first mixer mixes the first and second feeds to provide third and fourth feeds. A second MZI stage provides a second phase delay between the third and fourth feeds based on a second control signal, and a second mixer mixes the third and fourth feeds to provide fifth and sixth feeds. A third MZI stage provides a third phase delay between the fifth and sixth feeds based on a third control signal, and a third mixer mixes the fifth and sixth feeds to provide the fixed target polarization. An optical tap splits a portion of the beam.Type: GrantFiled: March 31, 2016Date of Patent: November 13, 2018Assignee: HUAWEI TECHNOLOGIES CO., LTD.Inventors: Chunshu Zhang, Jia Jiang, Dominic John Goodwill, Patrick Dumais
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Patent number: 10114173Abstract: An aspect of the disclosure provides a microring resonator (MRR). Such an MRR includes a ring optical waveguide and an optical waveguide, with the optical waveguide configured such that a first portion of the optical waveguide overlaps a second portion of the ring waveguide. In some embodiments, the optical waveguide has a first refractive index and the ring optical waveguide has a second refractive index such that the first refractive index is less than the second refractive index. In some embodiments, the optical waveguide is a polymer optical waveguide and the ring optical waveguide is a silicon optical waveguide. In some embodiments, the optical waveguide is larger in height than the ring waveguide and the first portion of the optical waveguide is configured to provide space for the second portion of the ring waveguide.Type: GrantFiled: March 14, 2017Date of Patent: October 30, 2018Assignee: HUAWEI TECHNOLOGIES CO., LTD.Inventors: Chunshu Zhang, Dominic John Goodwill
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Publication number: 20180267246Abstract: An aspect of the disclosure provides a microring resonator (MRR). Such an MRR includes a ring optical waveguide and an optical waveguide, with the optical waveguide configured such that a first portion of the optical waveguide overlaps a second portion of the ring waveguide. In some embodiments, the optical waveguide has a first refractive index and the ring optical waveguide has a second refractive index such that the first refractive index is less than the second refractive index. In some embodiments, the optical waveguide is a polymer optical waveguide and the ring optical waveguide is a silicon optical waveguide. In some embodiments, the optical waveguide is larger in height than the ring waveguide and the first portion of the optical waveguide is configured to provide space for the second portion of the ring waveguide.Type: ApplicationFiled: March 14, 2017Publication date: September 20, 2018Applicant: Huawei Technologies Co., Ltd.Inventors: Chunshu Zhang, Dominic John Goodwill
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Patent number: 10009668Abstract: As photonics evolves closer and closer to the electronic processing elements in order to meet the demands of speed, latency of evolving data communications networks and data centers the inventors, rather than seeking direct monolithically integrated CMOS based processing photonic and electronic elements, have established a different route. Namely replace the computer hubs/electrical bridges interconnecting the multiple core logic chipset elements with a photonic bridge. In this manner high risk chip-to-chip photonic point-to-point links are replaced with photonic SOCs that leverage photonics bandwidth density attribute rather than its bandwidth distance attributes. An SOI based Electronic Embedded Photonic Switching Fabric is presented supporting, for example, N×MGb/s interconnections exploiting N channels of MGb/s wherein each channel of exploits S WDM channels of TGb/s. Embodiments of the invention also support high density optical interconnection via vertical grating couplers and multicore fibers.Type: GrantFiled: December 1, 2015Date of Patent: June 26, 2018Assignee: THE ROYAL INSTITUTION FOR THE ADVANCEMENT OF LEARNING / MCGILL UNIVERSITYInventors: Odile Liboiron-Ladouceur, Md. Shafiqul Hai, Monireh Moayedi Pour Fard, Chunshu Zhang, Meer Sakib
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Publication number: 20170293086Abstract: Optical inputs to photonic switches may incorporate a polarization controller in order to change the polarization of the input signal to a pre-determined polarization for operation with the silicon photonics. A last stage of components of the polarization controller may overlap with a first input switching stage. A polarization controller that overlaps with the first stage of the switch input may provide lower insertion loss and power consumption for the photonic switch.Type: ApplicationFiled: April 11, 2016Publication date: October 12, 2017Inventors: Chunshu Zhang, Dominic John Goodwill
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Patent number: 9784921Abstract: Optical inputs to photonic switches may incorporate a polarization controller in order to change the polarization of the input signal to a pre-determined polarization for operation with the silicon photonics. A last stage of components of the polarization controller may overlap with a first input switching stage. A polarization controller that overlaps with the first stage of the switch input may provide lower insertion loss and power consumption for the photonic switch.Type: GrantFiled: April 11, 2016Date of Patent: October 10, 2017Assignee: HUAWEI TECHNOLOGIES CO., LTD.Inventors: Chunshu Zhang, Dominic John Goodwill
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Publication number: 20170285373Abstract: A photonic platform based polarization controller providing a fixed target polarization is disclosed. The polarization controller has a polarization rotator splitter splitting the beam into first and second feeds corresponding to first and second orthogonal polarization components. A first Mach-Zehnder interferometer (MZI) stage provides a first phase delay between the first and second feeds based on a first control signal, and a first mixer mixes the first and second feeds to provide third and fourth feeds. A second MZI stage provides a second phase delay between the third and fourth feeds based on a second control signal, and a second mixer mixes the third and fourth feeds to provide fifth and sixth feeds. A third MZI stage provides a third phase delay between the fifth and sixth feeds based on a third control signal, and a third mixer mixes the fifth and sixth feeds to provide the fixed target polarization. An optical tap splits a portion of the beam.Type: ApplicationFiled: March 31, 2016Publication date: October 5, 2017Inventors: Chunshu Zhang, Jia Jiang, Dominic John Goodwill, Patrick Dumais
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Publication number: 20170255079Abstract: A tunable optical directional coupler includes a first waveguide and a second waveguide proximal to the first waveguide, the first and second waveguides defining a light-coupling coefficient. The tunable optical directional coupler also includes a doped junction having a refractive index that is responsive to an applied bias voltage wherein the refractive index is changeable to enable tuning of the light-coupling coefficient. The tunable optical directional coupler may be used to split power, tune the phase, split polarizations or to tune a ratio of a tap-monitor.Type: ApplicationFiled: March 2, 2016Publication date: September 7, 2017Inventors: Jia Jiang, Chunshu Zhang
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Publication number: 20160349454Abstract: An optical coupling input/output interface including a multilayer ribbon comprising a plurality of layers with each layer having a plurality of waveguides. The I/O interface further includes a coupling interface section, wherein the plurality of layers are staggered to allow for evanescent coupling of the waveguides of each layer with a corresponding layer of waveguides in a photonic device.Type: ApplicationFiled: October 19, 2015Publication date: December 1, 2016Applicant: Huawei Technologies Co., Ltd.Inventors: Chunshu Zhang, Dritan Celo, Eric Bernier
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Publication number: 20160156999Abstract: As photonics evolves closer and closer to the electronic processing elements in order to meet the demands of speed, latency of evolving data communications networks and data centres the inventors, rather than seeking direct monolithically integrated CMOS based processing photonic and electronic elements, have established a different route. Namely replace the computer hubs/electrical bridges interconnecting the multiple core logic chipset elements with a photonic bridge. In this manner high risk chip-to-chip photonic point-to-point links are replaced with photonic SOCs that leverage photonics bandwidth density attribute rather than its bandwidth distance attributes. An SOI based Electronic Embedded Photonic Switching Fabric is presented supporting, for example, N×MGb/s interconnections exploiting N channels of MGb/s wherein each channel of exploits S WDM channels of TGb/s. Embodiments of the invention also support high density optical interconnection via vertical grating couplers and multicore fibers.Type: ApplicationFiled: December 1, 2015Publication date: June 2, 2016Inventors: Odile Liboiron-Ladouceur, Md. Shafiqul Hai, Monireh Moayedi Pour Fard, Chunshu Zhang, Meer Sakib