Patents by Inventor Prashanta Kharel
Prashanta Kharel 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: 11940677Abstract: An optical device including a waveguide, electrodes, and a connecting dielectric is described. The waveguide includes an electro-optic material having a waveguide optical refractive index and a waveguide microwave dielectric constant. The electrodes include a first electrode and a second electrode. The waveguide is between the first electrode and the second electrode. At least a portion of the connecting dielectric is between the waveguide and electrodes. The connecting dielectric has a microwave dielectric constant greater than the waveguide microwave dielectric constant.Type: GrantFiled: November 22, 2021Date of Patent: March 26, 2024Assignee: HyperLight CorporationInventors: Mian Zhang, Christian Reimer, Prashanta Kharel
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Publication number: 20230400717Abstract: An electro-optic device is described. The electro-optic device includes at least one optical material having an electro-optic effect. Further, the optical material(s) include lithium. The optical material(s) have a slab and a ridge waveguide. The slab has a top surface. The slab includes free surfaces. Each of the free surfaces is at a nonzero angle from the top surface of the slab and mitigates stress in the slab.Type: ApplicationFiled: June 13, 2023Publication date: December 14, 2023Inventors: Mian Zhang, Kevin Luke, Roy Meade, Prashanta Kharel, Christian Reimer, Fan Ye
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Publication number: 20230305326Abstract: An optical device includes a substrate, an oxide layer on the substrate and an electro-optic device on the oxide layer. The oxide layer is at least one micrometer thick. The electro-optic device includes an electro-optic material having a thickness of not more than one micrometer. The silicon substrate, oxide layer, and the electro-optic material terminate at an edge. At least one of the silicon substrate has a thickness of at least five hundred micrometers or the edge includes a recessed region corresponding to a portion of the oxide layer.Type: ApplicationFiled: March 23, 2023Publication date: September 28, 2023Inventors: Kevin Luke, Mian Zhang, Fan Ye, Roy Meade, Christian Reimer, Prashanta Kharel
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Publication number: 20230251511Abstract: An optical device is described. The optical device includes a waveguide, a first engineered electrode, and a second engineered electrode. The waveguide includes at optical material(s) having an electro-optic effect. The optical material(s) include lithium. A portion of the waveguide has a waveguide width. The first engineered electrode includes a first channel region and first extensions protruding from the first channel region. The first extensions are closer to the portion of the waveguide than the first channel region is. The second engineered electrode includes a second channel region and second extensions protruding from the second channel region. The second extensions are closer to the portion of the waveguide than the second channel region is. A first extension of the first extensions is a distance from a second extension of the second \extensions. The distance is less than the waveguide width.Type: ApplicationFiled: January 27, 2023Publication date: August 10, 2023Inventors: Prashanta Kharel, Mian Zhang, Christian Reimer, Kevin Luke, Lingyan He, Jeffrey Cole Holzgrafe
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Patent number: 11567353Abstract: An optical device including a waveguide and an electrode is described. The waveguide includes at least one optical material having an electro-optic effect. The electrode includes a channel region and extensions protruding from the channel region. The extensions are closer to a portion of the waveguide than the channel region is.Type: GrantFiled: November 23, 2020Date of Patent: January 31, 2023Assignee: HyperLight CorporationInventors: Prashanta Kharel, Mian Zhang, Christian Reimer, Kevin Luke, Lingyan He
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Publication number: 20220404652Abstract: A velocity mismatch between optical signals and microwave electrical signals in electro-optic devices, such as modulators, may be compensated by utilizing different lengths of bends in the optical waveguides as compared to the microwave electrodes to match the velocity of the microwave signal propagating along the coplanar waveguide to the velocity of the optical signal. To ensure the electrode bends do not affect the light in the optical waveguide bends, the electrode may have to be rerouted, e.g. above or below, the optical waveguide layer. To ensure that the pair of optical waveguides have the same optical length, a waveguide crossing may be used to cross the first waveguide through the second waveguide.Type: ApplicationFiled: August 26, 2022Publication date: December 22, 2022Inventors: Prashanta Kharel, Mian Zhang, Christian Reimer
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Publication number: 20220390777Abstract: An optical device including a waveguide and an electrode is described. The waveguide includes at least one optical material having an electro-optic effect. The electrode includes a channel region and extensions protruding from the channel region. The extensions are closer to a portion of the waveguide than the channel region is.Type: ApplicationFiled: June 17, 2022Publication date: December 8, 2022Inventors: Prashanta Kharel, Mian Zhang, Christian Reimer, Kevin Luke, Lingyan He
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Patent number: 11474384Abstract: A velocity mismatch between optical signals and microwave electrical signals in electro-optic devices, such as modulators, may be compensated by utilizing different lengths of bends in the optical waveguides as compared to the microwave electrodes to match the velocity of the microwave signal propagating along the coplanar waveguide to the velocity of the optical signal. To ensure the electrode bends do not affect the light in the optical waveguide bends, the electrode may have to be rerouted, e.g. above or below, the optical waveguide layer. To ensure that the pair of optical waveguides have the same optical length, a waveguide crossing may be used to cross the first waveguide through the second waveguide.Type: GrantFiled: April 2, 2020Date of Patent: October 18, 2022Assignee: HyperLight CorporationInventors: Prashanta Kharel, Mian Zhang, Christian Reimer
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Patent number: 11378741Abstract: Devices and systems for opto-acoustic signal processing are described herein. In one embodiment, the device may include a structure configured to laterally confine travelling acoustic phonons (hypersound) throughout, a first multimode optical waveguide embedded within the structure, and an acoustic phonon emitter within the structure, where the first multimode optical waveguide is selected to couple to the acoustic phonons (hypersound) confined within the structure. In one embodiment, the system may include a first light source optically coupled to a proximal end of the first multimode optical waveguide, the first light source emitting a probe wave having a frequency ?p(1), and a driver configured to drive the acoustic phonon emitter to emit acoustic phonons (hypersound).Type: GrantFiled: August 9, 2019Date of Patent: July 5, 2022Assignee: YALE UNIVERSITYInventors: Eric Kittlaus, Nils Otterstrom, Prashanta Kharel, Shai Gertler, Peter Rakich
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Publication number: 20210373364Abstract: An interface for an optical modulator and the optical modulator are described. The interface includes first and second differential line pairs. The first differential line pair has a first negative line and a first positive line arranged on opposing sides of a first waveguide. The first negative line is on a distal side of the first waveguide relative to a second waveguide. The first positive line is on a proximal side of the first waveguide relative to the second waveguide. The second differential line pair has a second negative line and a second positive line arranged on opposing sides of the second waveguide. The second negative line is on a distal side of the second waveguide relative to the first waveguide. The second positive line is on a proximal side of the second waveguide relative to the first waveguide. The first and second waveguides each include lithium niobate and/or lithium tantalate.Type: ApplicationFiled: June 1, 2021Publication date: December 2, 2021Inventors: Mian Zhang, Christian Reimer, Prashanta Kharel
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Publication number: 20210311336Abstract: A velocity mismatch between optical signals and microwave electrical signals in electro-optic devices, such as modulators, may be compensated by utilizing different lengths of bends in the optical waveguides as compared to the microwave electrodes to match the velocity of the microwave signal propagating along the coplanar waveguide to the velocity of the optical signal. To ensure the electrode bends do not affect the light in the optical waveguide bends, the electrode may have to be rerouted, e.g. above or below, the optical waveguide layer. To ensure that the pair of optical waveguides have the same optical length, a waveguide crossing may be used to cross the first waveguide through the second waveguide.Type: ApplicationFiled: April 2, 2020Publication date: October 7, 2021Inventors: Prashanta Kharel, Mian Zhang, Christian Reimer
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Publication number: 20210157177Abstract: An optical device including a waveguide and an electrode is described. The waveguide includes at least one optical material having an electro-optic effect. The electrode includes a channel region and extensions protruding from the channel region. The extensions are closer to a portion of the waveguide than the channel region is.Type: ApplicationFiled: November 23, 2020Publication date: May 27, 2021Inventors: Prashanta Kharel, Mian Zhang, Christian Reimer, Kevin Luke, Lingyan He
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Patent number: 11017310Abstract: Techniques for operating a mechanical oscillator as a quantum memory are described. According to some aspects, a qubit may be coupled to a piezoelectric material such that the electric field of the qubit causes stress within the piezoelectric material. The piezoelectric material may be in contact with a crystalline substrate forming an acoustic resonator such that the qubit couples to bulk acoustic waves in the crystalline substrate via its interaction with the piezoelectric material. According to some aspects, application of a suitable electromagnetic pulse to the qubit may cause an exchange of energy from the qubit to the acoustic phonon system and thereby transfer quantum information from the qubit to the phonon system.Type: GrantFiled: February 28, 2018Date of Patent: May 25, 2021Assignee: Yale UniversityInventors: Yiwen Chu, Prashanta Kharel, William Renninger, Luke Burkhart, Luigi Frunzio, Peter Rakich, Robert J. Schoelkopf, III
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Publication number: 20200234171Abstract: Techniques for operating a mechanical oscillator as a quantum memory are described. According to some aspects, a qubit may be coupled to a piezoelectric material such that the electric field of the qubit causes stress within the piezoelectric material. The piezoelectric material may be in contact with a crystalline substrate forming an acoustic resonator such that the qubit couples to bulk acoustic waves in the crystalline substrate via its interaction with the suitable electromagnetic pulse to the qubit may cause an exchange of energy from the qubit to the acoustic phonon system and thereby transfer quantum information from the qubit to the phonon system.Type: ApplicationFiled: February 28, 2018Publication date: July 23, 2020Applicant: Yale UniversityInventors: Yiwen Chu, Prashanta Kharel, William Renninger, Luke Burkhart, Luigi Frunzio, Peter Rakich, Robert J. Schoelkopf, III
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Publication number: 20200050030Abstract: Devices and systems for opto-acoustic signal processing are described herein. In one embodiment, the device may include a structure configured to laterally confine travelling acoustic phonons (hypersound) throughout, a first multimode optical waveguide embedded within the structure, and an acoustic phonon emitter within the structure, where the first multimode optical waveguide is selected to couple to the acoustic phonons (hypersound) confined within the structure. In one embodiment, the system may include a first light source optically coupled to a proximal end of the first multimode optical waveguide, the first light source emitting a probe wave having a frequency ?p(1), and a driver configured to drive the acoustic phonon emitter to emit acoustic phonons (hypersound).Type: ApplicationFiled: August 9, 2019Publication date: February 13, 2020Inventors: Eric Kittlaus, Nils Otterstrom, Prashanta Kharel, Shai Gertler, Peter Rakich
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Publication number: 20200030849Abstract: Techniques are provided to optomechanically couple light to a crystal structure, thereby producing stable, coherent bulk acoustic modes within the structure. In some embodiments, a resonator may comprise a plano-convex crystal structure to which pump light may be applied. The pump light may transfer energy to acoustic phonon modes of the crystal structure so as to create acoustic phonon modes with a coherence length greater than a length of the crystal structure. High frequency and high quality factor resonators may thereby be produced and operated.Type: ApplicationFiled: February 28, 2018Publication date: January 30, 2020Applicant: Yale UniversityInventors: Peter Rakich, Prashanta Kharel, William Renninger, Ryan Orson Behunin