Patents by Inventor Todd Rope
Todd Rope 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: 10425164Abstract: The present invention relates to telecommunication techniques and integrated circuit (IC) devices. More specifically, embodiments of the present invention provide an off-quadrature modulation system. Once an off-quadrature modulation position is determined, a ratio between DC power transfer amplitude and dither tone amplitude for a modulator is as a control loop target to stabilize off-quadrature modulation. DC power transfer amplitude is obtained by measuring and sampling the output of an optical modulator. Dither tone amplitude is obtained by measuring and sampling the modulator output and performing calculation using the optical modulator output values and corresponding dither tone values. There are other embodiments as well.Type: GrantFiled: September 28, 2018Date of Patent: September 24, 2019Assignee: INPHI CORPORATIONInventors: Todd Rope, Radhakrishnan L. Nagarajan, Hari Shankar
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Publication number: 20190268075Abstract: The present invention is directed to a communication signal tracking system comprising an optical receiver including one or more delay line interferometers (DLIs) configured to demultiplex incoming optical signals and a transimpedance amplifier configured to convert the incoming optical signals to incoming electrical signals. The communication signal tracking system further includes a control module configured to calculate a bit-error-rate (BER) of the incoming electrical signals before forward-error correction decoding, and use the BER as a parameter for optimizing settings of the one or more DLIs in one or more iterations in a control loop and generating a back-channel data.Type: ApplicationFiled: May 9, 2019Publication date: August 29, 2019Inventors: Todd ROPE, Sung CHOI, James STEWART, Radhakrishnan L. NAGARAJAN, Paul YU, Ilya LYUBOMIRSKY
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Patent number: 10382125Abstract: The present invention is directed to communication systems and methods. According to an embodiment, a receiving optical transceiver determines signal quality for signals received from a transmitting optical transceiver. Information related to the signal quality is embedded into back-channel data and sent to the transmitting optical transceiver. The transmitting optical transceiver detects the presence of the back-channel data and adjusts one or more of its operating parameters based on the back-channel data. There are other embodiments as well.Type: GrantFiled: January 20, 2017Date of Patent: August 13, 2019Assignee: INPHI CORPORATIONInventors: Todd Rope, Radhakrishnan L. Nagarajan
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Patent number: 10333627Abstract: The present invention is directed to a communication signal tracking system comprising an optical receiver including one or more delay line interferometers (DLIs) configured to demultiplex incoming optical signals and a transimpedance amplifier configured to convert the incoming optical signals to incoming electrical signals. The communication signal tracking system further includes a control module configured to calculate a bit-error-rate (BER) of the incoming electrical signals before forward-error correction decoding, and use the BER as a parameter for optimizing settings of the one or more DLIs in one or more iterations in a control loop and generating a back-channel data.Type: GrantFiled: June 26, 2017Date of Patent: June 25, 2019Assignee: Inphi CorporationInventors: Todd Rope, Sung Choi, James Stewart, Radhakrishnan L. Nagarajan, Paul Yu, Ilya Lyubomirsky
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Publication number: 20190036610Abstract: The present invention relates to telecommunication techniques and integrated circuit (IC) devices. More specifically, embodiments of the present invention provide an off-quadrature modulation system. Once an off-quadrature modulation position is determined, a ratio between DC power transfer amplitude and dither tone amplitude for a modulator is as a control loop target to stabilize off-quadrature modulation. DC power transfer amplitude is obtained by measuring and sampling the output of an optical modulator. Dither tone amplitude is obtained by measuring and sampling the modulator output and performing calculation using the optical modulator output values and corresponding dither tone values. There are other embodiments as well.Type: ApplicationFiled: September 28, 2018Publication date: January 31, 2019Inventors: Todd ROPE, Radhakrishnan L. NAGARAJAN, Hari SHANKAR
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Publication number: 20190013872Abstract: The present invention is directed to communication systems and methods. In a specific embodiment, the present invention provides an optical receiver that receives a data stream from an optical transmitter. The optical receiver determines a histogram contour parameter using the data stream and inserts the histogram contour parameter into a back-channel data segment, which is then transmitted to the optical transmitter. The optical transmitter changes its data transmission setting based on the histogram contour parameter. There are other embodiments as well.Type: ApplicationFiled: July 7, 2017Publication date: January 10, 2019Inventors: Todd ROPE, Hari SHANKAR, Radhakrishnan L. NAGARAJAN
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Publication number: 20180375587Abstract: The present invention is directed to a communication signal tracking system comprising an optical receiver including one or more delay line interferometers (DLIs) configured to demultiplex incoming optical signals and a transimpedance amplifier configured to convert the incoming optical signals to incoming electrical signals. The communication signal tracking system further includes a control module configured to calculate a bit-error-rate (BER) of the incoming electrical signals before forward-error correction decoding, and use the BER as a parameter for optimizing settings of the one or more DLIs in one or more iterations in a control loop and generating a back-channel data.Type: ApplicationFiled: June 26, 2017Publication date: December 27, 2018Inventors: Todd ROPE, Sung CHOI, James STEWART, Radhakrishnan L. NAGARAJAN, Paul YU, Ilya LYUBOMIRSKY
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Patent number: 10128955Abstract: A Pulse Amplitude Modulated (PAM) optical device utilizing multiple wavelengths, features a communications interface having enhanced diagnostics capability. New registers are created to house additional diagnostic information, such as error rates. The diagnostic information may be stored in raw form, or as processed on-chip utilizing local resources.Type: GrantFiled: May 25, 2018Date of Patent: November 13, 2018Assignee: INPHI CORPORATIONInventors: Todd Rope, Radhakrishnan L. Nagarajan, Jamal Riani, Pulkit Khandelwal
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Patent number: 10116393Abstract: A single chip dual-channel driver for two independent traveling wave modulators. The driver includes two differential pairs inputs per channel respectively configured to receive two digital differential pair signals. The driver further includes a two-bit DAC per channel coupled to the two differential pairs inputs to produce a single analog differential pair PAM signal at a differential pair output for driving a traveling wave modulator. Additionally, the driver includes a control block having internal voltage/current signal generators respective coupled to each input and the 2-bit DAC for providing a bias voltage, a tail current, a dither signal to assist modulation control per channel. Furthermore, the driver includes an internal I2C communication block coupled to a high-speed clock generator to generate control signals to the control block and coupled to host via an I2C digital communication interface.Type: GrantFiled: May 10, 2018Date of Patent: October 30, 2018Assignee: INPHI CORPORATIONInventors: Radhakrishnan L. Nagarajan, Todd Rope
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Patent number: 10116391Abstract: The present invention relates to telecommunication techniques and integrated circuit (IC) devices. More specifically, embodiments of the present invention provide an off-quadrature modulation system. Once an off-quadrature modulation position is determined, a ratio between DC power transfer amplitude and dither tone amplitude for a modulator is as a control loop target to stabilize off-quadrature modulation. DC power transfer amplitude is obtained by measuring and sampling the output of an optical modulator. Dither tone amplitude is obtained by measuring and sampling the modulator output and performing calculation using the optical modulator output values and corresponding dither tone values. There are other embodiments as well.Type: GrantFiled: November 2, 2017Date of Patent: October 30, 2018Assignee: INPHI CORPORATIONInventors: Todd Rope, Radhakrishnan L. Nagarajan, Hari Shankar
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Publication number: 20180294884Abstract: A Pulse Amplitude Modulated (PAM) optical device utilizing multiple wavelengths, features a communications interface having enhanced diagnostics capability. New registers are created to house additional diagnostic information, such as error rates. The diagnostic information may be stored in raw form, or as processed on-chip utilizing local resources.Type: ApplicationFiled: May 25, 2018Publication date: October 11, 2018Inventors: Todd ROPE, Radhakrishnan L. NAGARAJAN, Jamal RIANI, Pulkit KHANDELWAL
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Publication number: 20180262273Abstract: A single chip dual-channel driver for two independent traveling wave modulators. The driver includes two differential pairs inputs per channel respectively configured to receive two digital differential pair signals. The driver further includes a two-bit DAC per channel coupled to the two differential pairs inputs to produce a single analog differential pair PAM signal at a differential pair output for driving a traveling wave modulator. Additionally, the driver includes a control block having internal voltage/current signal generators respective coupled to each input and the 2-bit DAC for providing a bias voltage, a tail current, a dither signal to assist modulation control per channel. Furthermore, the driver includes an internal I2C communication block coupled to a high-speed clock generator to generate control signals to the control block and coupled to host via an I2C digital communication interface.Type: ApplicationFiled: May 10, 2018Publication date: September 13, 2018Inventors: Radhakrishnan L. NAGARAJAN, Todd ROPE
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Publication number: 20180212712Abstract: The present invention is directed to communication systems and methods. According to an embodiment, a receiving optical transceiver determines signal quality for signals received from a transmitting optical transceiver. Information related to the signal quality is embedded into back-channel data and sent to the transmitting optical transceiver. The transmitting optical transceiver detects the presence of the back-channel data and adjusts one or more of its operating parameters based on the back-channel data. There are other embodiments as well.Type: ApplicationFiled: January 20, 2017Publication date: July 26, 2018Inventors: Todd ROPE, Radhakrishnan L. NAGARAJAN
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Patent number: 10009109Abstract: A Pulse Amplitude Modulated (PAM) optical device utilizing multiple wavelengths, features a communications interface having enhanced diagnostics capability. New registers are created to house additional diagnostic information, such as error rates. The diagnostic information may be stored in raw form, or as processed on-chip utilizing local resources.Type: GrantFiled: August 28, 2017Date of Patent: June 26, 2018Assignee: INPHI CORPORATIONInventors: Todd Rope, Radhakrishnan L. Nagarajan, Jamal Riani, Pulkit Khandelwal
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Patent number: 9998231Abstract: A single chip dual-channel driver for two independent traveling wave modulators. The driver includes two differential pairs inputs per channel respectively configured to receive two digital differential pair signals. The driver further includes a two-bit DAC per channel coupled to the two differential pairs inputs to produce a single analog differential pair PAM signal at a differential pair output for driving a traveling wave modulator. Additionally, the driver includes a control block having internal voltage/current signal generators respective coupled to each input and the 2-bit DAC for providing a bias voltage, a tail current, a dither signal to assist modulation control per channel. Furthermore, the driver includes an internal I2C communication block coupled to a high-speed clock generator to generate control signals to the control block and coupled to host via an I2C digital communication interface.Type: GrantFiled: December 5, 2017Date of Patent: June 12, 2018Assignee: INPHI CORPORATIONInventors: Radhakrishnan L. Nagarajan, Todd Rope
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Publication number: 20180109324Abstract: A single chip dual-channel driver for two independent traveling wave modulators. The driver includes two differential pairs inputs per channel respectively configured to receive two digital differential pair signals. The driver further includes a two-bit DAC per channel coupled to the two differential pairs inputs to produce a single analog differential pair PAM signal at a differential pair output for driving a traveling wave modulator. Additionally, the driver includes a control block having internal voltage/current signal generators respective coupled to each input and the 2-bit DAC for providing a bias voltage, a tail current, a dither signal to assist modulation control per channel. Furthermore, the driver includes an internal I2C communication block coupled to a high-speed clock generator to generate control signals to the control block and coupled to host via an I2C digital communication interface.Type: ApplicationFiled: December 5, 2017Publication date: April 19, 2018Inventors: Radhakrishnan L. NAGARAJAN, Todd ROPE
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Publication number: 20180062751Abstract: The present invention relates to telecommunication techniques and integrated circuit (IC) devices. More specifically, embodiments of the present invention provide an off-quadrature modulation system. Once an off-quadrature modulation position is determined, a ratio between DC power transfer amplitude and dither tone amplitude for a modulator is as a control loop target to stabilize off-quadrature modulation. DC power transfer amplitude is obtained by measuring and sampling the output of an optical modulator. Dither tone amplitude is obtained by measuring and sampling the modulator output and performing calculation using the optical modulator output values and corresponding dither tone values. There are other embodiments as well.Type: ApplicationFiled: November 2, 2017Publication date: March 1, 2018Inventors: Todd ROPE, Radhakrishnan L. NAGARAJAN, Hari SHANKAR
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Patent number: 9900088Abstract: A Pulse Amplitude Modulated (PAM) optical device utilizing multiple wavelengths, features a communications interface having enhanced diagnostics capability. New registers are created to house additional diagnostic information, such as error rates. The diagnostic information may be stored in raw form, or as processed on-chip utilizing local resources.Type: GrantFiled: September 1, 2017Date of Patent: February 20, 2018Assignee: INPHI CORPORATIONInventor: Todd Rope
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Patent number: 9876579Abstract: A single chip dual-channel driver for two independent traveling wave modulators. The driver includes two differential pairs inputs per channel respectively configured to receive two digital differential pair signals. The driver further includes a two-bit DAC per channel coupled to the two differential pairs inputs to produce a single analog differential pair PAM signal at a differential pair output for driving a traveling wave modulator. Additionally, the driver includes a control block having internal voltage/current signal generators respective coupled to each input and the 2-bit DAC for providing a bias voltage, a tail current, a dither signal to assist modulation control per channel. Furthermore, the driver includes an internal I2C communication block coupled to a high-speed clock generator to generate control signals to the control block and coupled to host via an I2C digital communication interface.Type: GrantFiled: April 7, 2017Date of Patent: January 23, 2018Assignee: INPHI CORPORATIONInventors: Radhakrishnan L. Nagarajan, Todd Rope
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Publication number: 20170373759Abstract: A Pulse Amplitude Modulated (PAM) optical device utilizing multiple wavelengths, features a communications interface having enhanced diagnostics capability. New registers are created to house additional diagnostic information, such as error rates. The diagnostic information may be stored in raw form, or as processed on-chip utilizing local resources.Type: ApplicationFiled: August 28, 2017Publication date: December 28, 2017Inventors: Todd ROPE, Radhakrishnan L. NAGARAJAN, Jamal RIANI, Pulkit KHANDELWAL