Patents by Inventor Sudharsanan Srinivasan
Sudharsanan 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: 11927819Abstract: Examples described herein relate to an optical device with an integrated light-emitting structure to generate light and a waveguide integrated capacitor to monitor light. The light-emitting structure may emit light upon the application of electricity to the optical device. The waveguide integrated capacitor may be formed under the light-emitting structure to monitor the light emitted by the light-emitting structure. The waveguide integrated capacitor includes a waveguide region carrying at least a portion of the light. The waveguide region includes one or more photon absorption sites causing the generation of free charge carriers relative to an intensity of the light confined in the waveguide region resulting in a change in the conductance of the waveguide region.Type: GrantFiled: November 10, 2021Date of Patent: March 12, 2024Assignee: Hewlett Packard Enterprise Development LPInventors: Sudharsanan Srinivasan, Di Liang
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Patent number: 11886020Abstract: Examples described herein relate to a ring resonator. The ring resonator may include an annular waveguide having a waveguide base and a waveguide core narrower than the waveguide base. Further, the ring resonator may include an outer contact region comprising a first-type doping and disposed annularly and at least partially surrounding an outer annular surface of the waveguide base. Furthermore, the ring resonator may include an inner contact region comprising a second-type doping and disposed annularly contacting an inner annular surface of the waveguide base. Moreover, the ring resonator may include an annular detector region disposed annularly at a distance from and covering at least a portion of a surface of the waveguide core and contacting the outer contact region.Type: GrantFiled: July 16, 2021Date of Patent: January 30, 2024Assignee: Hewlett Packard Enterprise Development LPInventors: Yuan Yuan, Sudharsanan Srinivasan, Di Liang, Zhihong Huang
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Patent number: 11815725Abstract: An example photonic integrated circuit includes a transmitter circuit with a optical communication path to an optical coupler configured to couple with an optical fiber. The optical communication path has a propagation direction away from the transmitter circuit and towards the optical coupler. A counter-propagating tap diverts light sent by a light source backward against the propagation direction of the optical communication path. A photodiode receives the diverted light and measures its power level. The photodiode generates a feedback signal for the optical coupler and provides the feedback signal to the optical coupler. The optical coupler receives the feedback signal and adjusts a coupling alignment of the optical communication path to the optical fiber based on the feedback signal, which indicates the measured power level of the diverted counter-propagating light.Type: GrantFiled: December 17, 2021Date of Patent: November 14, 2023Assignee: OpenLight Photonics, Inc.Inventors: Brandon W. Buckley, Brian Robert Koch, John Garcia, Jared Bauters, Sudharsanan Srinivasan, Anand Ramaswamy
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Publication number: 20230143150Abstract: Examples described herein relate to an optical device with an integrated light-emitting structure to generate light and a waveguide integrated capacitor to monitor light. The light-emitting structure may emit light upon the application of electricity to the optical device. The waveguide integrated capacitor may be formed under the light-emitting structure to monitor the light emitted by the light-emitting structure. The waveguide integrated capacitor includes a waveguide region carrying at least a portion of the light. The waveguide region includes one or more photon absorption sites causing the generation of free charge carriers relative to an intensity of the light confined in the waveguide region resulting in a change in the conductance of the waveguide region.Type: ApplicationFiled: November 10, 2021Publication date: May 11, 2023Inventors: Sudharsanan Srinivasan, Di Liang
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Patent number: 11630334Abstract: Examples described herein relate to an optical coupler. The optical coupler may include a first optical waveguide base layer, a second optical waveguide base layer, an insulating layer disposed over at least a portion of both the first optical waveguide base layer and the second optical waveguide base layer, and a semiconductor material layer disposed over the insulating layer. Overlapping portions of the first optical waveguide base layer, the insulating layer, and the semiconductor material layer form a first optical waveguide, and overlapping portions of the second optical waveguide base layer, the insulating layer, and the semiconductor material layer form a second optical waveguide. Moreover, the optical coupler may include a plurality of metal contacts to receive one or more first biasing voltages to operate one of the first optical waveguide base layer and the second optical waveguide base layer in an accumulation mode.Type: GrantFiled: September 24, 2020Date of Patent: April 18, 2023Assignee: Hewlett Packard Enterprise Development LPInventors: Stanley Cheung, Di Liang, Sudharsanan Srinivasan
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Publication number: 20230014190Abstract: Examples described herein relate to a ring resonator. The ring resonator may include an annular waveguide having a waveguide base and a waveguide core narrower than the waveguide base. Further, the ring resonator may include an outer contact region comprising a first-type doping and disposed annularly and at least partially surrounding an outer annular surface of the waveguide base. Furthermore, the ring resonator may include an inner contact region comprising a second-type doping and disposed annularly contacting an inner annular surface of the waveguide base. Moreover, the ring resonator may include an annular detector region disposed annularly at a distance from and covering at least a portion of a surface of the waveguide core and contacting the outer contact region.Type: ApplicationFiled: July 16, 2021Publication date: January 19, 2023Inventors: Yuan Yuan, Sudharsanan Srinivasan, Di Liang, Zhihong Huang
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Patent number: 11546055Abstract: An optical transceiver can be calibrated using an internal receiver side eye scan generator, and calibration values (e.g., modulator values) can be stored in memory for recalibration of the optical transceiver. The eye scan generator can receive data from the transmitter portion via an integrated and reconfigurable loopback path. At a later time, different calibration values can be accessed in memory and used to recalibrate the optical transceiver or update the calibrated values using the receive-side eye scan generator operating in loopback mode.Type: GrantFiled: June 15, 2021Date of Patent: January 3, 2023Assignee: OpenLight Photonics, Inc.Inventors: Robert S. Guzzon, Sean P. Woyciehowsky, Roberto Marcoccia, Anand Ramaswamy, John Garcia, Sudharsanan Srinivasan
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Patent number: 11539440Abstract: Examples herein relate to optical systems. In particular, implementations herein relate to an optical system including an optical transmitter configured to transmit optical signals. The optical transmitter includes a first optical source and a second optical source coupled to the first optical source and injection seeded by the first optical source. The optical transmitter further includes an output coupler, the second optical source coupled to the optical coupler via an output waveguide and configured to emit light having multiple different wavelengths through the output waveguide. In some implementations, the second optical source is self-injection seeded.Type: GrantFiled: July 16, 2020Date of Patent: December 27, 2022Assignee: Hewlett Packard Enterprise Development LPInventors: Geza Kurczveil, Di Liang, Sudharsanan Srinivasan, Raymond G. Beausoleil
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Patent number: 11487181Abstract: Examples herein relate to optical systems. In particular, implementations herein relate to an optical system including an optical transmitter configured to transmit optical signals. The optical transmitter includes a first optical source coupled to an input waveguide and configured to emit light having different wavelengths through the input waveguide. The optical transmitter includes a Mach-Zehnder interferometer that includes a first arm and a second arm. The MZI further includes a first optical coupler configured to couple the emitted light from the input waveguide to the first and second arms and an array of two or more second optical sources coupled to the first arm. Each of the two or more second optical sources are configured to be injection locked to a different respective wavelength of the emitted light transmitted from the first optical source. The MZI further includes a second optical coupler configured to combine the emitted light from the first and second arms after propagating therethrough.Type: GrantFiled: June 30, 2020Date of Patent: November 1, 2022Assignee: Hewlett Packard Enterprise Development LPInventors: Sudharsanan Srinivasan, Di Liang, Geza Kurczveil, Raymond G. Beausoleil
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Patent number: 11442235Abstract: Examples described herein relate to an optical system. In some examples, the optical system may include a light-conducting medium and a first optical device to transmit an optical signal over the light-conducting medium. Further, the optical system may include a second optical device coupled to the light-conducting medium to receive an optical signal transmitted by the first optical device. In some examples, at least one of the first optical device, the light-conducting medium, and the second optical device may include an in-situ capacitive structure to detect light intensity. Moreover, the optical system may include a monitoring circuit electrically coupled to the in-situ capacitive structure to generate an electrical signal indicative of the light intensity detected by the in-situ capacitive structure.Type: GrantFiled: July 29, 2021Date of Patent: September 13, 2022Assignee: Hewlett Packard Enterprise Development LPInventors: Di Liang, Sudharsanan Srinivasan
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Publication number: 20220091446Abstract: Examples described herein relate to an optical coupler. The optical coupler may include a first optical waveguide base layer, a second optical waveguide base layer, an insulating layer disposed over at least a portion of both the first optical waveguide base layer and the second optical waveguide base layer, and a semiconductor material layer disposed over the insulating layer. Overlapping portions of the first optical waveguide base layer, the insulating layer, and the semiconductor material layer form a first optical waveguide, and overlapping portions of the second optical waveguide base layer, the insulating layer, and the semiconductor material layer form a second optical waveguide. Moreover, the optical coupler may include a plurality of metal contacts to receive one or more first biasing voltages to operate one of the first optical waveguide base layer and the second optical waveguide base layer in an accumulation mode.Type: ApplicationFiled: September 24, 2020Publication date: March 24, 2022Inventors: Stanley Cheung, Di Liang, Sudharsanan Srinivasan
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Patent number: 11243362Abstract: An example photonic integrated circuit includes a transmitter circuit with a optical communication path to an optical coupler configured to couple with an optical fiber. The optical communication path has a propagation direction away from the transmitter circuit and towards the optical coupler. A counter-propagating tap diverts light sent by a light source backward against the propagation direction of the optical communication path. A photodiode receives the diverted light and measures its power level. The photodiode generates a feedback signal for the optical coupler and provides the feedback signal to the optical coupler. The optical coupler receives the feedback signal and adjusts a coupling alignment of the optical communication path to the optical fiber based on the feedback signal, which indicates the measured power level of the diverted counter-propagating light.Type: GrantFiled: July 1, 2020Date of Patent: February 8, 2022Assignee: Juniper Networks, Inc.Inventors: Brandon W. Buckley, Brian Robert Koch, John Garcia, Jared Bauters, Sudharsanan Srinivasan, Anand Ramaswamy
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Publication number: 20220021459Abstract: Examples herein relate to optical systems. In particular, implementations herein relate to an optical system including an optical transmitter configured to transmit optical signals. The optical transmitter includes a first optical source and a second optical source coupled to the first optical source and injection seeded by the first optical source. The optical transmitter further includes an output coupler, the second optical source coupled to the optical coupler via an output waveguide and configured to emit light having multiple different wavelengths through the output waveguide. In some implementations, the second optical source is self-injection seeded.Type: ApplicationFiled: July 16, 2020Publication date: January 20, 2022Inventors: Geza Kurczveil, Di Liang, Sudharsanan Srinivasan, Raymond G. Beausoleil
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Publication number: 20210405499Abstract: Examples herein relate to optical systems. In particular, implementations herein relate to an optical system including an optical transmitter configured to transmit optical signals. The optical transmitter includes a first optical source coupled to an input waveguide and configured to emit light having different wavelengths through the input waveguide. The optical transmitter includes a Mach-Zehnder interferometer that includes a first arm and a second arm. The MZI further includes a first optical coupler configured to couple the emitted light from the input waveguide to the first and second arms and an array of two or more second optical sources coupled to the first arm. Each of the two or more second optical sources are configured to be injection locked to a different respective wavelength of the emitted light transmitted from the first optical source. The MZI further includes a second optical coupler configured to combine the emitted light from the first and second arms after propagating therethrough.Type: ApplicationFiled: June 30, 2020Publication date: December 30, 2021Inventors: Sudharsanan Srinivasan, Di Liang, Geza Kurczveil, Raymond G. Beausoleil
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Publication number: 20210399799Abstract: An optical transceiver can be calibrated using an internal receiver side eye scan generator, and calibration values (e.g., modulator values) can be stored in memory for recalibration of the optical transceiver. The eye scan generator can receive data from the transmitter portion via an integrated and reconfigurable loopback path. At a later time, different calibration values can be accessed in memory and used to recalibrate the optical transceiver or update the calibrated values using the receive-side eye scan generator operating in loopback mode.Type: ApplicationFiled: June 15, 2021Publication date: December 23, 2021Inventors: Robert S. Guzzon, Sean P. Woyciehowsky, Roberto Marcoccia, Anand Ramaswamy, John Garcia, Sudharsanan Srinivasan
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Patent number: 11070288Abstract: An optical transceiver can be calibrated using an internal receiver side eye scan generator, and calibration values (e.g., modulator values) can be stored in memory for recalibration of the optical transceiver. The eye scan generator can receive data from the transmitter portion via an integrated and reconfigurable loopback path. At a later time, different calibration values can be accessed in memory and used to recalibrate the optical transceiver or update the calibrated values using the receive-side eye scan generator operating in loopback mode.Type: GrantFiled: June 22, 2020Date of Patent: July 20, 2021Assignee: Juniper Networks, Inc.Inventors: Robert S. Guzzon, Sean P. Woyciehowsky, Roberto Marcoccia, Anand Ramaswamy, John Garcia, Sudharsanan Srinivasan
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Publication number: 20200333540Abstract: An example photonic integrated circuit includes a transmitter circuit with a optical communication path to an optical coupler configured to couple with an optical fiber. The optical communication path has a propagation direction away from the transmitter circuit and towards the optical coupler. A counter-propagating tap diverts light sent by a light source backward against the propagation direction of the optical communication path. A photodiode receives the diverted light and measures its power level. The photodiode generates a feedback signal for the optical coupler and provides the feedback signal to the optical coupler. The optical coupler receives the feedback signal and adjusts a coupling alignment of the optical communication path to the optical fiber based on the feedback signal, which indicates the measured power level of the diverted counter-propagating light.Type: ApplicationFiled: July 1, 2020Publication date: October 22, 2020Inventors: Brandon W. Buckley, Brian Robert Koch, John Garcia, Jared Bauters, Sudharsanan Srinivasan, Anand Ramaswamy
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Patent number: 10739539Abstract: An example photonic integrated circuit includes a transmitter circuit with a optical communication path to an optical coupler configured to couple with an optical fiber. The optical communication path has a propagation direction away from the transmitter circuit and towards the optical coupler. A counter-propagating tap diverts light sent by a light source backward against the propagation direction of the optical communication path. A photodiode receives the diverted light and measures its power level. The photodiode generates a feedback signal for the optical coupler and provides the feedback signal to the optical coupler. The optical coupler receives the feedback signal and adjusts a coupling alignment of the optical communication path to the optical fiber based on the feedback signal, which indicates the measured power level of the diverted counter-propagating light.Type: GrantFiled: March 15, 2019Date of Patent: August 11, 2020Assignee: Juniper Networks, Inc.Inventors: Brandon W. Buckley, Brian Robert Koch, John Garcia, Jared Bauters, Sudharsanan Srinivasan, Anand Ramaswamy
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Publication number: 20190212505Abstract: An example photonic integrated circuit includes a transmitter circuit with a optical communication path to an optical coupler configured to couple with an optical fiber. The optical communication path has a propagation direction away from the transmitter circuit and towards the optical coupler. A counter-propagating tap diverts light sent by a light source backward against the propagation direction of the optical communication path. A photodiode receives the diverted light and measures its power level. The photodiode generates a feedback signal for the optical coupler and provides the feedback signal to the optical coupler. The optical coupler receives the feedback signal and adjusts a coupling alignment of the optical communication path to the optical fiber based on the feedback signal, which indicates the measured power level of the diverted counter-propagating light.Type: ApplicationFiled: March 15, 2019Publication date: July 11, 2019Inventors: Brandon W. Buckley, Brian Robert Koch, John Garcia, Jared Bauters, Sudharsanan Srinivasan, Anand Ramaswamy
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Patent number: 10281663Abstract: An example photonic integrated circuit includes a transmitter circuit with a optical communication path to an optical coupler configured to couple with an optical fiber. The optical communication path has a propagation direction away from the transmitter circuit and towards the optical coupler. A counter-propagating tap diverts light sent by a light source backward against the propagation direction of the optical communication path. A photodiode receives the diverted light and measures its power level. The photodiode generates a feedback signal for the optical coupler and provides the feedback signal to the optical coupler. The optical coupler receives the feedback signal and adjusts a coupling alignment of the optical communication path to the optical fiber based on the feedback signal, which indicates the measured power level of the diverted counter-propagating light.Type: GrantFiled: January 8, 2018Date of Patent: May 7, 2019Assignee: Juniper Networks, Inc.Inventors: Brandon W. Buckley, Brian Robert Koch, John Garcia, Jared Bauters, Sudharsanan Srinivasan, Anand Ramaswamy