Patents by Inventor Ravi S. TUMMIDI
Ravi S. TUMMIDI 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: 11762159Abstract: Embodiments described herein include an apparatus comprising a semiconductor-based photodiode disposed on a semiconductor layer, and an optical waveguide spaced apart from the semiconductor layer and evanescently coupled with a depletion region of the photodiode. The photodiode may be arranged as a vertical photodiode or a lateral photodiode.Type: GrantFiled: May 13, 2021Date of Patent: September 19, 2023Assignee: Cisco Technology, Inc.Inventors: Prakash B. Gothoskar, Vipulkumar K. Patel, Soha Namnabat, Ravi S. Tummidi
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Publication number: 20230243718Abstract: Electrical test of optical components via metal-insulator-semiconductor capacitor structures is provided via a plurality of optical devices including a first material embedded in a second material, wherein each optical device is associated with a different thickness range of a plurality of thickness ranges for the first material; a first capacitance measurement point including the first material embedded in the second material; and a second capacitance measurement point including a region from which the first material has been replaced with the second material.Type: ApplicationFiled: April 7, 2023Publication date: August 3, 2023Inventors: Xunyuan ZHANG, Ravi S. TUMMIDI, Tony P. POLOUS, Mark A. WEBSTER
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Patent number: 11693200Abstract: Embodiments herein describe using a double wafer bonding process to form a photonic device. In one embodiment, during the bonding process, an optical element (e.g., a high precision optical element) is optically coupled to an optical device in an active surface layer. In one example, the optical element comprises a nitride layer which can be patterned to form a nitride waveguide, passive optical multiplexer or demultiplexer, or an optical coupler.Type: GrantFiled: July 19, 2021Date of Patent: July 4, 2023Assignee: Cisco Technology, Inc.Inventors: Vipulkumar K. Patel, Ravi S. Tummidi, Mark A. Webster
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Patent number: 11686648Abstract: Electrical test of optical components via metal-insulator-semiconductor capacitor structures is provided via a plurality of optical devices including a first material embedded in a second material, wherein each optical device is associated with a different thickness range of a plurality of thickness ranges for the first material; a first capacitance measurement point including the first material embedded in the second material; and a second capacitance measurement point including a region from which the first material has been replaced with the second material.Type: GrantFiled: July 23, 2021Date of Patent: June 27, 2023Assignee: Cisco Technology, Inc.Inventors: Xunyuan Zhang, Ravi S. Tummidi, Tony P. Polous, Mark A. Webster
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Publication number: 20230119450Abstract: Fabrication-tolerant on-chip multiplexers and demultiplexers are provides via a lattice filter interleaver configured to receive an input signal including a plurality of individual signals and to produce a first interleaved signal with a first subset of the plurality of individual signals and a second interleaved signal with a second subset of the plurality of individual signals; a first Bragg interleaver configured to receive the first interleaved signal and produce a first output signal including a first individual signal of the plurality of individual signals and a second output signal including a second individual signal of the plurality of individual signals; and a second Bragg interleaver configured to receive the second interleaved signal and produce a third output signal including a third individual signal of the plurality of individual signals and a fourth output signal including a fourth individual signal of the plurality of individual signals.Type: ApplicationFiled: October 18, 2021Publication date: April 20, 2023Inventors: Yi Ho LEE, Tao LING, Ravi S. TUMMIDI, Mark A. WEBSTER, Prakash B. GOTHOSKAR
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Publication number: 20230076009Abstract: Process margin relaxation is provided in relation to a compensated-for process via a first optical device, fabricated to satisfy an operational specification when a compensated-for process is within a first tolerance range; a second optical device, fabricated to satisfy the operational specification when the compensated-for process is within second tolerance range, different than the first tolerance range; a first optical switch connected to an input and configured to output an optical signal received from the input to one of the first optical device and the second optical device; and a second optical switch configured to combine outputs from the first optical device and the second optical device.Type: ApplicationFiled: November 16, 2022Publication date: March 9, 2023Inventors: Tao LING, Ravi S. TUMMIDI, Yi Ho LEE, Mark A. WEBSTER
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Publication number: 20230022612Abstract: Electrical test of optical components via metal-insulator-semiconductor capacitor structures is provided via a plurality of optical devices including a first material embedded in a second material, wherein each optical device is associated with a different thickness range of a plurality of thickness ranges for the first material; a first capacitance measurement point including the first material embedded in the second material; and a second capacitance measurement point including a region from which the first material has been replaced with the second material.Type: ApplicationFiled: July 23, 2021Publication date: January 26, 2023Inventors: Xunyuan ZHANG, Ravi S. TUMMIDI, Tony P. POLOUS, Mark A. WEBSTER
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Publication number: 20230015671Abstract: Embodiments herein describe using a double wafer bonding process to form a photonic device. In one embodiment, during the bonding process, an optical element (e.g., a high precision optical element) is optically coupled to an optical device in an active surface layer. In one example, the optical element comprises a nitride layer which can be patterned to form a nitride waveguide, passive optical multiplexer or demultiplexer, or an optical coupler.Type: ApplicationFiled: July 19, 2021Publication date: January 19, 2023Inventors: Vipulkumar K. PATEL, Ravi S. TUMMIDI, Mark A. WEBSTER
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Patent number: 11523192Abstract: Process margin relaxation is provided in relation to a compensated-for process via a first optical device, fabricated to satisfy an operational specification when a compensated-for process is within a first tolerance range; a second optical device, fabricated to satisfy the operational specification when the compensated-for process is within second tolerance range, different than the first tolerance range; a first optical switch connected to an input and configured to output an optical signal received from the input to one of the first optical device and the second optical device; and a second optical switch configured to combine outputs from the first optical device and the second optical device.Type: GrantFiled: July 2, 2021Date of Patent: December 6, 2022Assignee: Cisco Technology, Inc.Inventors: Tao Ling, Ravi S. Tummidi, Yi Ho Lee, Mark A. Webster
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Patent number: 11520106Abstract: An optical device is disclosed, including a phase delay, a first adiabatic coupler adapted to receive an input signal and adapted to be optically coupled to an input of the phase delay, and a second adiabatic coupler adapted to be optically coupled to an output of the phase delay. The second adiabatic coupler includes a first waveguide including a first portion optically coupled to the first output and including a first width, and a second waveguide including a second portion optically coupled to the second output and including a second width that is approximately equal to the first width.Type: GrantFiled: February 26, 2021Date of Patent: December 6, 2022Assignee: Cisco Technology, Inc.Inventors: Yi Ho Lee, Tao Ling, Ravi S. Tummidi, Mark A. Webster
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Patent number: 11467420Abstract: Aspects described herein include an optical apparatus comprising an input port configured to receive an optical signal comprising a plurality of wavelengths, and a plurality of output ports. Each output port is configured to output a respective wavelength of the plurality of wavelengths. The optical apparatus further comprises a first plurality of two-mode Bragg gratings in a cascaded arrangement. Each grating of the first plurality of two-mode Bragg gratings is configured to reflect a respective wavelength of the plurality of wavelengths toward a respective output port of the plurality of output ports, and transmit any remaining wavelengths of the plurality of wavelengths.Type: GrantFiled: April 20, 2021Date of Patent: October 11, 2022Assignee: Cisco Technology, Inc.Inventors: Tao Ling, Yi Ho Lee, Ravi S. Tummidi, Mark A. Webster
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Patent number: 11360268Abstract: Aspects described herein include a mode multiplexer comprising a first optical waveguide extending between a first port and a second port. A first input mode of an optical signal entering the first port is propagated through the first optical waveguide to the second port. The mode multiplexer further comprises a second optical waveguide configured to evanescently couple with a coupling section of the first optical waveguide. A second input mode of the optical signal entering the first port is propagated through the second optical waveguide to a third port. The first optical waveguide further defines a filtering section between the coupling section and the second port, the filtering section configured to filter the second input mode.Type: GrantFiled: March 17, 2021Date of Patent: June 14, 2022Assignee: Cisco Technology, Inc.Inventors: Tao Ling, Shiyi Chen, Ravi S. Tummidi
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Patent number: 11249246Abstract: Aspects described herein include an optical apparatus comprising a multiple-stage arrangement of two-mode Bragg gratings comprising: at least a first Bragg grating of a first stage. The first Bragg grating is configured to transmit a first two wavelengths and to reflect a second two wavelengths of a received optical signal. The optical apparatus further comprises a second Bragg grating of a second stage. The second Bragg grating is configured to transmit one of the first two wavelengths and to reflect an other of the first two wavelengths. The optical apparatus further comprises a third Bragg grating of the second stage. The third Bragg grating is configured to transmit one of the second two wavelengths and to reflect an other of the second two wavelengths.Type: GrantFiled: November 30, 2020Date of Patent: February 15, 2022Assignee: Cisco Technology, Inc.Inventors: Tao Ling, Yi Ho Lee, Ravi S. Tummidi, Mark A. Webster
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Publication number: 20210345022Abstract: Process margin relaxation is provided in relation to a compensated-for process via a first optical device, fabricated to satisfy an operational specification when a compensated-for process is within a first tolerance range; a second optical device, fabricated to satisfy the operational specification when the compensated-for process is within second tolerance range, different than the first tolerance range; a first optical switch connected to an input and configured to output an optical signal received from the input to one of the first optical device and the second optical device; and a second optical switch configured to combine outputs from the first optical device and the second optical device.Type: ApplicationFiled: July 2, 2021Publication date: November 4, 2021Inventors: Tao LING, Ravi S. TUMMIDI, Yi Ho LEE, Mark A. WEBSTER
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Publication number: 20210286190Abstract: Aspects described herein include an optical apparatus comprising an input port configured to receive an optical signal comprising a plurality of wavelengths, and a plurality of output ports. Each output port is configured to output a respective wavelength of the plurality of wavelengths. The optical apparatus further comprises a first plurality of two-mode Bragg gratings in a cascaded arrangement. Each grating of the first plurality of two-mode Bragg gratings is configured to reflect a respective wavelength of the plurality of wavelengths toward a respective output port of the plurality of output ports, and transmit any remaining wavelengths of the plurality of wavelengths.Type: ApplicationFiled: April 20, 2021Publication date: September 16, 2021Inventors: Tao LING, Yi Ho LEE, Ravi S. TUMMIDI, Mark A. WEBSTER
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Publication number: 20210278615Abstract: Embodiments described herein include an apparatus comprising a semiconductor-based photodiode disposed on a semiconductor layer, and an optical waveguide spaced apart from the semiconductor layer and evanescently coupled with a depletion region of the photodiode. The photodiode may be arranged as a vertical photodiode or a lateral photodiode.Type: ApplicationFiled: May 13, 2021Publication date: September 9, 2021Inventors: Prakash B. GOTHOSKAR, Vipulkumar K. PATEL, Soha NAMNABAT, Ravi S. TUMMIDI
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Patent number: 11089391Abstract: Process margin relaxation is provided in relation to a compensated-for process via a first optical device, fabricated to satisfy an operational specification when a compensated-for process is within a first tolerance range; a second optical device, fabricated to satisfy the operational specification when the compensated-for process is within second tolerance range, different than the first tolerance range; a first optical switch connected to an input and configured to output an optical signal received from the input to one of the first optical device and the second optical device; and a second optical switch configured to combine outputs from the first optical device and the second optical device.Type: GrantFiled: April 29, 2020Date of Patent: August 10, 2021Assignee: Cisco Technology, Inc.Inventors: Tao Ling, Ravi S. Tummidi, Yi Ho Lee, Mark A. Webster
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Patent number: 11067765Abstract: Embodiments described herein include an apparatus comprising a semiconductor-based photodiode disposed on a semiconductor layer, and an optical waveguide spaced apart from the semiconductor layer and evanescently coupled with a depletion region of the photodiode. The photodiode may be arranged as a vertical photodiode or a lateral photodiode.Type: GrantFiled: November 27, 2019Date of Patent: July 20, 2021Assignee: Cisco Technology, Inc.Inventors: Prakash B. Gothoskar, Vipulkumar K. Patel, Soha Namnabat, Ravi S. Tummidi
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Publication number: 20210181419Abstract: An optical device is disclosed, including a phase delay, a first adiabatic coupler adapted to receive an input signal and adapted to be optically coupled to an input of the phase delay, and a second adiabatic coupler adapted to be optically coupled to an output of the phase delay. The second adiabatic coupler includes a first waveguide including a first portion optically coupled to the first output and including a first width, and a second waveguide including a second portion optically coupled to the second output and including a second width that is approximately equal to the first width.Type: ApplicationFiled: February 26, 2021Publication date: June 17, 2021Inventors: Yi Ho LEE, Tao LING, Ravi S. TUMMIDI, Mark A. WEBSTER
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Publication number: 20210157068Abstract: Embodiments described herein include an apparatus comprising a semiconductor-based photodiode disposed on a semiconductor layer, and an optical waveguide spaced apart from the semiconductor layer and evanescently coupled with a depletion region of the photodiode. The photodiode may be arranged as a vertical photodiode or a lateral photodiode.Type: ApplicationFiled: November 27, 2019Publication date: May 27, 2021Inventors: Prakash B. GOTHOSKAR, Vipulkumar K. PATEL, Soha NAMNABAT, Ravi S. TUMMIDI