Patents by Inventor Pradeep Srinivasan
Pradeep Srinivasan 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: 11061123Abstract: A LiDAR system includes an optical source to emit an optical beam and a PSR a silicon nitride based waveguide to split and rotate an optical beam. The silicon nitride based waveguide includes a first silicon nitride segment including a first layer and a second layer, the first silicon nitride segment having tapered widths along a longitudinal direction. The second layer includes a first section extending from a first end of the first silicon nitride segment to a converging plane with increasing widths and a second section extending from the converging plane to a second end of the first silicon nitride segment with decreasing widths. The LIDAR system further includes an optical element to generate a local oscillator (LO) signal and an optical detector to mix the target return signal with the LO signal to generate a heterodyne signal to extract range and velocity information of the target.Type: GrantFiled: April 2, 2021Date of Patent: July 13, 2021Assignee: Aeva, Inc.Inventors: Bing Shen, Kevin Masuda, Brett E. Huff, Pradeep Srinivasan
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Patent number: 11054674Abstract: A modulator. In some embodiments, the modulator includes a portion of an optical waveguide, the waveguide including a rib extending upwards from a surrounding slab. The rib may have a first sidewall, and a second sidewall parallel to the first sidewall. The rib may include a first region of a first conductivity type, and a second region of a second conductivity type different from the first conductivity type. The second region may have a first portion parallel to and extending to the first sidewall, and a second portion parallel to the second sidewall. The first region may extend between the first portion of the second region and the second portion of the second region.Type: GrantFiled: April 24, 2019Date of Patent: July 6, 2021Assignee: Rockley Photonics LimitedInventors: Dong Yoon Oh, David Arlo Nelson, Pradeep Srinivasan, Amit Singh Nagra, Aaron John Zilkie, Jeffrey Driscoll, Aaron L. Birkbeck
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Publication number: 20210199995Abstract: An optoelectronic device and an array comprising a plurality of the same. The device(s) comprising: an optically active region with an electrode arrangement for applying an electric field across the optically active region; a first curved waveguide, arranged to guide light into the optically active region; and a second curved waveguide, arranged to guide light out of the optically active region; wherein the first curved waveguide and the second curved waveguide are formed of a material having a different band-gap from a band-gap of the optically active region, and wherein the overall guided path formed by the first curved waveguide, the optically active region and the second curved waveguide is U-shaped.Type: ApplicationFiled: March 11, 2021Publication date: July 1, 2021Inventors: Aaron John Zilkie, Pradeep Srinivasan
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Publication number: 20210167583Abstract: A multi-channel laser source, including: a bus waveguide coupled, at an output end of the bus waveguide, to an output of the multi-channel laser source; a first semiconductor optical amplifier; a first back mirror; a first wavelength-dependent coupler, having a first resonant wavelength, on the bus waveguide; a second semiconductor optical amplifier; a second back mirror; and a second wavelength-dependent coupler, on the bus waveguide, having a second resonant wavelength, different from the first resonant wavelength. In some embodiments the first semiconductor optical amplifier is coupled to the bus waveguide by the first wavelength-dependent coupler, which is nearer to the output end of the bus waveguide than the second wavelength-dependent coupler, the second semiconductor optical amplifier is coupled to the bus waveguide by the second wavelength-dependent coupler, and the first wavelength-dependent coupler is configured to transmit light, at the second resonant wavelength, along the bus waveguide.Type: ApplicationFiled: February 9, 2021Publication date: June 3, 2021Inventors: Aaron John Zilkie, Pradeep Srinivasan
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Patent number: 10983200Abstract: A light detection and ranging (LiDAR) system according to the present disclosure comprises an optical source to emit an optical beam. The LiDAR system comprises a PSR comprising a silicon nitride based waveguide to split and rotate a target return signal of the optical beam from a target. The silicon nitride based waveguide includes a first silicon nitride segment and a second silicon nitride segment. The first silicon nitride segment includes a first layer and a second layer. The first silicon nitride segment has tapered widths along a longitudinal direction. The second silicon nitride segment includes a silicon nitride adiabatic coupler. The LiDAR system further comprises an optical element to generate a local oscillator (LO) signal and a PD to mix the target return signal with the LO signal to generate a heterodyne signal to extract information of the target.Type: GrantFiled: December 21, 2020Date of Patent: April 20, 2021Assignee: Aeva, Inc.Inventors: Bing Shen, Kevin Masuda, Brett E. Huff, Pradeep Srinivasan
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Patent number: 10962718Abstract: A reconfigurable spectroscopy system comprises tunable lasers and wavelength lockers to lock to accurate reference wavelengths. Band combiners with differently optimized wavelength ranges multiplex the optical signal over the time domain, to emit a plurality of reference wavelengths for spectroscopy applications. The power requirements are greatly reduced by multiplexing over the time domain in time slots which do not affect sampling and receiving of the spectroscopy data.Type: GrantFiled: May 5, 2020Date of Patent: March 30, 2021Assignee: ROCKLEY PHOTONICS LIMITEDInventors: Hooman Abediasl, Amit Singh Nagra, Andrew George Rickman, Thomas Pierre Schrans, Pradeep Srinivasan, Andrea Trita, Aaron John Zilkie
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Publication number: 20210083457Abstract: A multi-channel laser source, including: a bus waveguide coupled, at an output end of the bus waveguide, to an output of the multi-channel laser source; a first semiconductor optical amplifier; a first back mirror; a first wavelength-dependent coupler, having a first resonant wavelength, on the bus waveguide; a second semiconductor optical amplifier; a second back mirror; and a second wavelength-dependent coupler, on the bus waveguide, having a second resonant wavelength, different from the first resonant wavelength. In some embodiments the first semiconductor optical amplifier is coupled to the bus waveguide by the first wavelength-dependent coupler, which is nearer to the output end of the bus waveguide than the second wavelength-dependent coupler, the second semiconductor optical amplifier is coupled to the bus waveguide by the second wavelength-dependent coupler, and the first wavelength-dependent coupler is configured to transmit light, at the second resonant wavelength, along the bus waveguide.Type: ApplicationFiled: November 25, 2020Publication date: March 18, 2021Inventors: Aaron John Zilkie, Pradeep Srinivasan
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Publication number: 20210080761Abstract: An optoelectronic device and an array comprising a plurality of the same. The device(s) comprising: an optically active region with an electrode arrangement for applying an electric field across the optically active region; a first curved waveguide, arranged to guide light into the optically active region; and a second curved waveguide, arranged to guide light out of the optically active region; wherein the first curved waveguide and the second curved waveguide are formed of a material having a different band-gap from a band-gap of the optically active region, and wherein the overall guided path formed by the first curved waveguide, the optically active region and the second curved waveguide is U-shaped.Type: ApplicationFiled: November 13, 2020Publication date: March 18, 2021Inventors: Aaron John Zilkie, Pradeep Srinivasan
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Patent number: 10928659Abstract: An optoelectronic device and method of making the same. The device comprising: a substrate; an epitaxial crystalline cladding layer, on top of the substrate; and an optically active region, above the epitaxial crystalline cladding layer; wherein the epitaxial crystalline cladding layer has a refractive index which is less than a refractive index of the optically active region, such that the optical power of the optoelectronic device is confined to the optically active region.Type: GrantFiled: February 13, 2019Date of Patent: February 23, 2021Assignee: Rockley Photonics LimitedInventors: Andrew Rickman, Aaron Zilkie, Guomin Yu, Hooman Abediasl, Damiana Lerose, Amit Singh Nagra, Pradeep Srinivasan, Haydn Jones
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Patent number: 10921616Abstract: An optoelectronic device and method of making the same. The device comprising: a substrate; an epitaxial crystalline cladding layer, on top of the substrate; and an optically active region, above the epitaxial crystalline cladding layer; wherein the epitaxial crystalline cladding layer has a refractive index which is less than a refractive index of the optically active region, such that the optical power of the optoelectronic device is confined to the optically active region.Type: GrantFiled: May 22, 2019Date of Patent: February 16, 2021Assignee: Rockley Photonics LimitedInventors: Guomin Yu, Hooman Abediasl, Damiana Lerose, Amit Singh Nagra, Pradeep Srinivasan, Haydn Jones
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Publication number: 20200412103Abstract: A multi-channel laser source, including: a bus waveguide coupled, at an output end of the bus waveguide, to an output of the multi-channel laser source; a first semiconductor optical amplifier; a first back mirror; a first wavelength-dependent coupler, having a first resonant wavelength, on the bus waveguide; a second semiconductor optical amplifier; a second back mirror; and a second wavelength-dependent coupler, on the bus waveguide, having a second resonant wavelength, different from the first resonant wavelength. In some embodiments the first semiconductor optical amplifier is coupled to the bus waveguide by the first wavelength-dependent coupler, which is nearer to the output end of the bus waveguide than the second wavelength-dependent coupler, the second semiconductor optical amplifier is coupled to the bus waveguide by the second wavelength-dependent coupler, and the first wavelength-dependent coupler is configured to transmit light, at the second resonant wavelength, along the bus waveguide.Type: ApplicationFiled: September 16, 2020Publication date: December 31, 2020Inventors: Aaron John Zilkie, Pradeep Srinivasan
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Publication number: 20200363663Abstract: An optoelectronic device and an array comprising a plurality of the same. The device(s) comprising: an optically active region with an electrode arrangement for applying an electric field across the optically active region; a first curved waveguide, arranged to guide light into the optically active region; and a second curved waveguide, arranged to guide light out of the optically active region; wherein the first curved waveguide and the second curved waveguide are formed of a material having a different band-gap from a band-gap of the optically active region, and wherein the overall guided path formed by the first curved waveguide, the optically active region and the second curved waveguide is U-shaped.Type: ApplicationFiled: August 4, 2020Publication date: November 19, 2020Inventors: Aaron John Zilkie, Pradeep Srinivasan
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Patent number: 10816830Abstract: An optoelectronic device and method of making the same. The device comprising: a substrate; an epitaxial crystalline cladding layer, on top of the substrate; and an optically active region, above the epitaxial crystalline cladding layer; wherein the epitaxial crystalline cladding layer has a refractive index which is less than a refractive index of the optically active region, such that the optical power of the optoelectronic device is confined to the optically active region.Type: GrantFiled: February 13, 2019Date of Patent: October 27, 2020Assignee: ROCKLEY PHOTONICS LIMITEDInventors: Andrew Rickman, Aaron Zilkie, Guomin Yu, Hooman Abediasl, Damiana Lerose, Amit Singh Nagra, Pradeep Srinivasan, Haydn Jones
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Patent number: 10811848Abstract: A multi-channel laser source, including: a bus waveguide coupled, at an output end of the bus waveguide, to an output of the multi-channel laser source; a first semiconductor optical amplifier; a first back mirror; a first wavelength-dependent coupler, having a first resonant wavelength, on the bus waveguide; a second semiconductor optical amplifier; a second back mirror; and a second wavelength-dependent coupler, on the bus waveguide, having a second resonant wavelength, different from the first resonant wavelength. In some embodiments the first semiconductor optical amplifier is coupled to the bus waveguide by the first wavelength-dependent coupler, which is nearer to the output end of the bus waveguide than the second wavelength-dependent coupler, the second semiconductor optical amplifier is coupled to the bus waveguide by the second wavelength-dependent coupler, and the first wavelength-dependent coupler is configured to transmit light, at the second resonant wavelength, along the bus waveguide.Type: GrantFiled: June 13, 2018Date of Patent: October 20, 2020Assignee: Rockley Photonics LimitedInventors: Aaron John Zilkie, Pradeep Srinivasan
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Publication number: 20200303891Abstract: A Distributed Feedback Laser (DFB) mounted on a Silicon Photonic Integrated Circuit (Si PIC), the DFB having a longitudinal length which extends from a first end of the DFB laser to a second end of the DFB laser, the DFB laser comprising: an epi stack, the epi stack comprising: one or more active material layers; a layer comprising a partial grating, the partial grating extending from the second end of the DFB laser, only partially along the longitudinal length of the DFB laser such that it does not extend to the first end of the DFB laser; a highly reflective medium located at the first end of the DFB laser; and a back facet located at the second end of the DFB laser.Type: ApplicationFiled: March 20, 2020Publication date: September 24, 2020Inventors: Mazin Alalusi, Kevin Masuda, Pradeep Srinivasan
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Publication number: 20200264377Abstract: A reconfigurable spectroscopy system comprises tunable lasers and wavelength lockers to lock to accurate reference wavelengths. Band combiners with differently optimized wavelength ranges multiplex the optical signal over the time domain, to emit a plurality of reference wavelengths for spectroscopy applications. The power requirements are greatly reduced by multiplexing over the time domain in time slots which do not affect sampling and receiving of the spectroscopy data.Type: ApplicationFiled: May 5, 2020Publication date: August 20, 2020Inventors: Hooman ABEDIASL, Amit Singh NAGRA, Andrew George RICKMAN, Thomas Pierre SCHRANS, Pradeep SRINIVASAN, Andrea TRITA, Aaron John ZILKIE
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Patent number: 10677989Abstract: A reconfigurable spectroscopy system comprises tunable lasers and wavelength lockers to lock to accurate reference wavelengths. Band combiners with differently optimized wavelength ranges multiplex the optical signal over the time domain, to emit a plurality of reference wavelengths for spectroscopy applications. The power requirements are greatly reduced by multiplexing over the time domain in time slots which do not affect sampling and receiving of the spectroscopy data.Type: GrantFiled: July 3, 2018Date of Patent: June 9, 2020Assignee: ROCKLEY PHOTONICS LIMITEDInventors: Hooman Abediasl, Andrew George Rickman, Amit Singh Nagra, Andrea Trita, Thomas Pierre Schrans, Aaron John Zilkie, Pradeep Srinivasan
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Publication number: 20200133091Abstract: A modulator. In some embodiments, the modulator includes a portion of an optical waveguide, the waveguide including a rib extending upwards from a surrounding slab. The rib may have a first sidewall, and a second sidewall parallel to the first sidewall. The rib may include a first region of a first conductivity type, and a second region of a second conductivity type different from the first conductivity type. The second region may have a first portion parallel to and extending to the first sidewall, and a second portion parallel to the second sidewall. The first region may extend between the first portion of the second region and the second portion of the second region.Type: ApplicationFiled: April 24, 2019Publication date: April 30, 2020Inventors: DongYoon Oh, David Arlo Nelson, Pradeep Srinivasan, Amit Singh Nagra, Aaron John Zilkie, Jeffrey Driscoll, Aaron L. Birkbeck
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Publication number: 20200124878Abstract: A Mach-Zehnder waveguide modulator. In some embodiments, the Mach-Zehnder waveguide modulator includes a first arm including a first optical waveguide, and a second arm including a second optical waveguide. The first optical waveguide includes a junction, and the Mach-Zehnder waveguide modulator further includes a plurality of electrodes for providing a bias across the junction to enable control of the phase of light travelling through the junction.Type: ApplicationFiled: August 23, 2019Publication date: April 23, 2020Inventors: Guomin Yu, Hooman Abediasl, Aaron L. Birkbeck, Jeffrey Driscoll, Haydn Frederick Jones, Damiana Lerose, Amit Singh Nagra, David Arlo Nelson, DongYoon Oh, Pradeep Srinivasan, Aaron John Zilkie
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Publication number: 20190310496Abstract: An optoelectronic device and an array comprising a plurality of the same. The device(s) comprising: an optically active region with an electrode arrangement for applying an electric field across the optically active region; a first curved waveguide, arranged to guide light into the optically active region; and a second curved waveguide, arranged to guide light out of the optically active region; wherein the first curved waveguide and the second curved waveguide are formed of a material having a different band-gap to a band-gap of the optically active region, and wherein the overall guided path formed by the first curved waveguide, the optically active region and the second curved waveguide is U-shaped.Type: ApplicationFiled: April 4, 2019Publication date: October 10, 2019Inventors: Aaron John Zilkie, Andy McKee, Pradeep Srinivasan