Patents by Inventor Lukas Jakober
Lukas Jakober 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: 11818242Abstract: An optical system includes a transmitter including transmitter circuitry configured to cause transmission of a transmitted optical signal over a fiber link on an X polarization and a Y polarization; and a receiver including receiver circuitry configured to receive a received optical signal from the fiber link on the X polarization and the Y polarization, wherein the transmitter circuitry is configured to cause State of Polarization (SOP) changes on the X polarization and the Y polarization for a test of the fiber link. The transmitter circuitry and the receiver circuitry are built-in with the transmitter and the receiver, respectively, for performance of the test.Type: GrantFiled: September 10, 2020Date of Patent: November 14, 2023Inventors: Ahmad Abdo, Shahab Oveis Gharan, Sadok Aouini, Naim Ben-Hamida, Timothy James Creasy, Lukas Jakober, Yalmez M. A. Yazaw
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Patent number: 11349486Abstract: Clock circuits, components, systems and signal processing methods enabling digital communication are described. A phase locked loop device derives an output signal locked to a first reference clock signal in a feedback loop. A common phase detector is employed to obtain phase differences between a copy of the output signal and a second reference clock signal. The phase differences are employed in an integral phase control loop within the feedback loop to lock the phase locked loop device to the center frequency of the second reference signal. The phase differences are also employed in a proportional phase control loop within the feedback loop to reduce the effect of imperfect component operation. Cascading the integral and proportional phase control within the feedback loop enables an amount of phase error to be filtered out from the output signal.Type: GrantFiled: February 25, 2020Date of Patent: May 31, 2022Assignee: Ciena CorporationInventors: Sadok Aouini, Naim Ben-Hamida, Timothy James Creasy, Ahmad Abdo, Mahdi Parvizi, Lukas Jakober
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Publication number: 20220149847Abstract: Clock circuits, components, systems and signal processing methods enabling digital communication are described. A phase locked loop device derives an output signal locked to a first reference clock signal in a feedback loop. A common phase detector is employed to obtain phase differences between a copy of the output signal and a second reference clock signal. The phase differences are employed in an integral phase control loop within the feedback loop to lock the phase locked loop device to the center frequency of the second reference signal. The phase differences are also employed in a proportional phase control loop within the feedback loop to reduce the effect of imperfect component operation. Cascading the integral and proportional phase control within the feedback loop enables an amount of phase error to be filtered out from the output signal.Type: ApplicationFiled: February 25, 2020Publication date: May 12, 2022Inventors: Sadok Aouini, Naim Ben-Hamida, Timothy James Creasy, Ahmad Abdo, Mahdi Parvizi, Lukas Jakober
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Patent number: 11121769Abstract: A receiver is configured to calculate a representation of a received signal conveying symbols at a frequency fS, the representation comprising a first frequency band and a second frequency band which are disjoint and have non-zero correlation. The receiver calculates a first term comprising a function of a phase difference between the representation at a first pair of frequencies separated by a gap ? and comprised within the first frequency band, and a second term comprising a function of a phase difference between the representation at a second pair of frequencies separated by the gap ? and comprised within the second frequency band, wherein the higher frequency of the first pair and the higher frequency of the second pair are separated by a gap G. An estimate of chromatic dispersion in the received signal is calculated based on the first term and the second term.Type: GrantFiled: September 14, 2020Date of Patent: September 14, 2021Assignee: Ciena CorporationInventors: Shahab Oveis Gharan, Lukas Jakober
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Publication number: 20210152242Abstract: A receiver is configured to calculate a representation of a received signal conveying symbols at a frequency fS, the representation comprising a first frequency band and a second frequency band which are disjoint and have non-zero correlation. The receiver calculates a first term comprising a function of a phase difference between the representation at a first pair of frequencies separated by a gap ? and comprised within the first frequency band, and a second term comprising a function of a phase difference between the representation at a second pair of frequencies separated by the gap ? and comprised within the second frequency band, wherein the higher frequency of the first pair and the higher frequency of the second pair are separated by a gap G. An estimate of chromatic dispersion in the received signal is calculated based on the first term and the second term.Type: ApplicationFiled: September 14, 2020Publication date: May 20, 2021Applicant: Ciena CorporationInventors: Shahab OVEIS GHARAN, Lukas JAKOBER
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Publication number: 20200412520Abstract: An optical system includes a transmitter including transmitter circuitry configured to cause transmission of a transmitted optical signal over a fiber link on an X polarization and a Y polarization; and a receiver including receiver circuitry configured to receive a received optical signal from the fiber link on the X polarization and the Y polarization, wherein the transmitter circuitry is configured to cause State of Polarization (SOP) changes on the X polarization and the Y polarization for a test of the fiber link. The transmitter circuitry and the receiver circuitry are built-in with the transmitter and the receiver, respectively, for performance of the test.Type: ApplicationFiled: September 10, 2020Publication date: December 31, 2020Inventors: Ahmad Abdo, Shahab Oveis Gharan, Sadok Aouini, Naim Ben-Hamida, Timothy James Creasy, Lukas Jakober, Yalmez M.A. Yazaw
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Patent number: 10855380Abstract: Techniques and circuits are proposed to increase averaging in the clock recovery band based on an amount of channel overlap in receivers using excess bandwidth for clock recovery, to mitigate the impact of spectral energy leaking into an active channel of interest from an adjacent active channel and to improve the accuracy of the phase estimate of the received transmitted clock.Type: GrantFiled: February 7, 2019Date of Patent: December 1, 2020Assignee: Ciena CorporationInventors: Sadok Aouini, Bilal Riaz, Naim Ben-Hamida, Lukas Jakober, Ahmad Abdo
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Publication number: 20200344038Abstract: A system includes an optical transmitter including a transmitter Phase Lock Loop (PLL) circuit; an optical receiver connected to the optical transmitter and including a receiver PLL circuit; and circuitry configured to inject a test stimulus to a clock causing jitter in one of the transmitter PLL circuitry and the receiver PLL circuit, wherein the test stimulus is set for characterizing the jitter tolerance of optical receiver. As well, a circuit that injects SOP transient at the transmitter is included. It is configured to test the tolerance of optical receiver to handle fast change in the SOP state. The optical receiver is configured to determine if the system is operational at a jitter value due to the test stimulus based on compliance to one or more thresholds including any of a target Bit Error Rate, a Forward-Error-Correction (FEC) hit, and a jitter Root Mean Square (RMS).Type: ApplicationFiled: April 23, 2019Publication date: October 29, 2020Inventors: Sadok Aouini, Naim Ben-Hamida, Ahmad Abdo, Timothy James Creasy, Lukas Jakober, Yalmez M.A. Yazaw, Shahab Oveis Gharan
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Patent number: 10819432Abstract: A receiver is configured to calculate a representation of a received signal conveying symbols at a frequency fS, the representation comprising non-zero components at frequencies of magnitudes exceeding fS/2. The receiver calculates a first term comprising a function of a phase difference between the representation at a first pair of frequencies separated by a gap ? and comprised within a first band of width 2? centered at fS/2, and a second term comprising a function of a phase difference between the representation at a second pair of frequencies separated by the gap ? and comprised within a second band of width 2? centered at ?fS/2, wherein ?<2?, and wherein the higher frequency of the first pair and the higher frequency of the second pair are separated by the frequency fS. An estimate of chromatic dispersion in the received signal is calculated based on the first term and the second term.Type: GrantFiled: November 18, 2019Date of Patent: October 27, 2020Assignee: CIENA CORPORATIONInventors: Shahab Oveis Gharan, Lukas Jakober
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Patent number: 10805064Abstract: A system includes an optical transmitter including a transmitter Phase Lock Loop (PLL) circuit; an optical receiver connected to the optical transmitter and including a receiver PLL circuit; and circuitry configured to inject a test stimulus to a clock causing jitter in one of the transmitter PLL circuitry and the receiver PLL circuit, wherein the test stimulus is set for characterizing the jitter tolerance of optical receiver. As well, a circuit that injects SOP transient at the transmitter is included. It is configured to test the tolerance of optical receiver to handle fast change in the SOP state. The optical receiver is configured to determine if the system is operational at a jitter value due to the test stimulus based on compliance to one or more thresholds including any of a target Bit Error Rate, a Forward-Error-Correction (FEC) hit, and a jitter Root Mean Square (RMS).Type: GrantFiled: April 23, 2019Date of Patent: October 13, 2020Assignee: Ciena CorporationInventors: Sadok Aouini, Naim Ben-Hamida, Ahmad Abdo, Timothy James Creasy, Lukas Jakober, Yalmez M. A. Yazaw, Shahab Oveis Gharan
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Publication number: 20200274537Abstract: Clock circuits, components, systems and signal processing methods enabling digital communication are described. A phase locked loop device derives an output signal locked to a first reference clock signal in a feedback loop. A common phase detector is employed to obtain phase differences between a copy of the output signal and a second reference clock signal. The phase differences are employed in an integral phase control loop within the feedback loop to lock the phase locked loop device to the center frequency of the second reference signal. The phase differences are also employed in a proportional phase control loop within the feedback loop to reduce the effect of imperfect component operation. Cascading the integral and proportional phase control within the feedback loop enables an amount of phase error to be filtered out from the output signal.Type: ApplicationFiled: December 23, 2019Publication date: August 27, 2020Inventors: Sadok Aouini, Naim Ben-Hamida, Timothy James Creasy, Ahmad Abdo, Mahdi Parvizi, Lukas Jakober
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Patent number: 10749536Abstract: Clock circuits, components, systems and signal processing methods enabling digital communication are described. A phase locked loop device derives an output signal locked to a first reference clock signal in a feedback loop. A common phase detector is employed to obtain phase differences between a copy of the output signal and a second reference clock signal. The phase differences are employed in an integral phase control loop within the feedback loop to lock the phase locked loop device to the center frequency of the second reference signal. The phase differences are also employed in a proportional phase control loop within the feedback loop to reduce the effect of imperfect component operation. Cascading the integral and proportional phase control within the feedback loop enables an amount of phase error to be filtered out from the output signal.Type: GrantFiled: December 23, 2019Date of Patent: August 18, 2020Assignee: Ciena CorporationInventors: Sadok Aouini, Naim Ben-Hamida, Timothy James Creasy, Ahmad Abdo, Mahdi Parvizi, Lukas Jakober
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Patent number: 10516403Abstract: Clock circuits, components, systems and signal processing methods enabling digital communication are described. A phase locked loop device derives an output signal locked to a first reference clock signal in a feedback loop. A common phase detector is employed to obtain phase differences between a copy of the output signal and a second reference clock signal. The phase differences are employed in an integral phase control loop within the feedback loop to lock the phase locked loop device to the center frequency of the second reference signal. The phase differences are also employed in a proportional phase control loop within the feedback loop to reduce the effect of imperfect component operation. Cascading the integral and proportional phase control within the feedback loop enables an amount of phase error to be filtered out from the output signal.Type: GrantFiled: February 27, 2019Date of Patent: December 24, 2019Assignee: Ciena CorporationInventors: Sadok Aouini, Naim Ben-Hamida, Timothy James Creasy, Ahmad Abdo, Mahdi Parvizi, Lukas Jakober
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Publication number: 20190190617Abstract: Techniques and circuits are proposed to increase averaging in the clock recovery band based on an amount of channel overlap in receivers using excess bandwidth for clock recovery, to mitigate the impact of spectral energy leaking into an active channel of interest from an adjacent active channel and to improve the accuracy of the phase estimate of the received transmitted clock.Type: ApplicationFiled: February 7, 2019Publication date: June 20, 2019Inventors: Sadok Aouini, Bilal Riaz, Naim Ben-Hamida, Lukas Jakober, Ahmad Abdo
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Patent number: 10243671Abstract: Techniques and circuits are proposed to increase averaging in the clock recovery band based on an amount of channel overlap in receivers using excess bandwidth for clock recovery, to mitigate the impact of spectral energy leaking into an active channel of interest from an adjacent active channel and to improve the accuracy of the phase estimate of the received transmitted clock.Type: GrantFiled: October 27, 2017Date of Patent: March 26, 2019Assignee: Ciena CorporationInventors: Sadok Aouini, Bilal Riaz, Naim Ben-Hamida, Lukas Jakober, Ahmad Abdo
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Patent number: 10187197Abstract: A method for clock recovery that may include obtaining an output signal from a phase locked loop (PLL) device. The method may further include determining, using a digital phase detector, the output signal, and a transmitter clock signal, an amount of phase difference between the output signal and the transmitter clock signal. The method may further include filtering, using a phase rotator and a digital accumulator, a portion of the amount of phase difference from the output signal to generate a filtered signal.Type: GrantFiled: July 23, 2018Date of Patent: January 22, 2019Assignee: Ciena CorporationInventors: Sadok Aouini, Naim Ben-Hamida, Christopher Kurowski, Lukas Jakober
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Publication number: 20180331818Abstract: A method for clock recovery that may include obtaining an output signal from a phase locked loop (PLL) device. The method may further include determining, using a digital phase detector, the output signal, and a transmitter clock signal, an amount of phase difference between the output signal and the transmitter clock signal. The method may further include filtering, using a phase rotator and a digital accumulator, a portion of the amount of phase difference from the output signal to generate a filtered signal.Type: ApplicationFiled: July 23, 2018Publication date: November 15, 2018Inventors: Sadok Aouini, Naim Ben-Hamida, Christopher Kurowski, Lukas Jakober
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Patent number: 10063367Abstract: A method for clock recovery that may include obtaining an output signal from a phase locked loop (PLL) device. The method may further include determining, using a digital phase detector, the output signal, and a transmitter clock signal, an amount of phase difference between the output signal and the transmitter clock signal. The method may further include filtering, using a phase rotator and a digital accumulator, a portion of the amount of phase difference from the output signal to generate a filtered signal.Type: GrantFiled: April 28, 2017Date of Patent: August 28, 2018Assignee: Ciena CorporationInventors: Sadok Aouini, Naim Ben-Hamida, Christopher Kurowski, Lukas Jakober
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Patent number: 9774394Abstract: Managing performance of an optical communications network may be facilitated by digital noise loading techniques. The digital noise loading techniques may include measuring a quality of a communication signal received at a coherent optical receiver, applying digital noise to the communication signal at the coherent optical receiver, and detecting a change in the quality of the communication signal at the coherent optical receiver in response to the application of the digital noise. Based on the change in the quality of the communication signal, an operating characteristic and/or a performance margin of the coherent optical receiver may be determined, prompting or facilitating further actions such as adjusting one or more operating parameters of the optical communications network and/or triggering an alert.Type: GrantFiled: November 19, 2015Date of Patent: September 26, 2017Assignee: Ciena CorporationInventors: James Harley, Jamie Gaudette, Lukas Jakober, Elizabeth Rivera Hartling, Bilal Riaz
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Publication number: 20160173198Abstract: Managing performance of an optical communications network may be facilitated by digital noise loading techniques. The digital noise loading techniques may include measuring a quality of a communication signal received at a coherent optical receiver, applying digital noise to the communication signal at the coherent optical receiver, and detecting a change in the quality of the communication signal at the coherent optical receiver in response to the application of the digital noise. Based on the change in the quality of the communication signal, an operating characteristic and/or a performance margin of the coherent optical receiver may be determined, prompting or facilitating further actions such as adjusting one or more operating parameters of the optical communications network and/or triggering an alert.Type: ApplicationFiled: November 19, 2015Publication date: June 16, 2016Inventors: James HARLEY, Jamie GAUDETTE, Lukas JAKOBER, Elizabeth Rivera HARTLING, Bilal RIAZ