Patents by Inventor Michael G. Vrazel
Michael G. Vrazel 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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Publication number: 20240137198Abstract: A receiver includes: equalizer circuitry; clock and data recovery (CDR) circuitry; sampler circuitry; adaptation circuitry; and clock adjustment circuitry. The receiver is configured to: receive data via a channel; perform equalization operations on received data, the equalization operations resulting in equalization results; perform sampling operations responsive to the equalization results, the sampling operations resulting in data samples and error samples; perform adaptation operations responsive to the data samples and the error samples, the adaptation operations resulting in a clock adjustment control signal; and adjust a sampling clock signal relative to a CDR clock signal responsive to the clock adjustment control signal.Type: ApplicationFiled: April 27, 2023Publication date: April 25, 2024Inventors: Abishek MANIAN, Ashkan ROSHAN ZAMIR, Yonghui TANG, Robin GUPTA, Michael G. VRAZEL
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Patent number: 8605566Abstract: A circuit can process a sample of a signal to emulate, simulate, or model an effect on the signal. Thus, an emulation circuit can produce a representation of a real-world signal transformation by processing the signal according to one or more signal processing parameters that are characteristic of the real-world signal transformation. The emulation circuit can apply analog signal processing and/or mixed signal processing to the signal. The signal processing can comprise feeding the signal through two signal paths, each having a different delay, and creating a weighted sum of the outputs of the two signal paths. The signal processing can also (or alternatively) comprise routing the signal through a network of delay elements, wherein a bank of switching or routing elements determines the route and thus the resulting delay.Type: GrantFiled: August 25, 2010Date of Patent: December 10, 2013Assignee: Quellan, Inc.Inventors: Bruce C. Schmukler, Arvind Raghavan, Ziba Nami, Jyothi Emmanuel Peddi, Andrew Joo Kim, Michael G. Vrazel, Charles E. Summers
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Patent number: 8068406Abstract: Signals propagating in one communication channel can generate crosstalk interference in another communication channel. A crosstalk cancellation device can process the signals causing the crosstalk interference and generate a crosstalk cancellation signal that can compensate for the crosstalk when applied to the channel receiving crosstalk interference. The crosstalk cancellation device can include a model of the crosstalk effect that generates a signal emulating the actual crosstalk both in form an in timing. The crosstalk cancellation device can include a controller that monitors crosstalk-compensated communication signals and adjusts the model to enhance crosstalk cancellation performance. The crosstalk cancellation device can have a mode of self configuration or calibration in which defined test signals can be transmitted on the crosstalk-generating channel and the crosstalk-receiving channel.Type: GrantFiled: October 19, 2009Date of Patent: November 29, 2011Assignee: Quellan, Inc.Inventors: Andrew Joo Kim, Michael G. Vrazel, Sanjay Bajekal, Charles Summers
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Publication number: 20110069604Abstract: A circuit can process a sample of a signal to emulate, simulate, or model an effect on the signal. Thus, an emulation circuit can produce a representation of a real-world signal transformation by processing the signal according to one or more signal processing parameters that are characteristic of the real-world signal transformation. The emulation circuit can apply analog signal processing and/or mixed signal processing to the signal. The signal processing can comprise feeding the signal through two signal paths, each having a different delay, and creating a weighted sum of the outputs of the two signal paths. The signal processing can also (or alternatively) comprise routing the signal through a network of delay elements, wherein a bank of switching or routing elements determines the route and thus the resulting delay.Type: ApplicationFiled: August 25, 2010Publication date: March 24, 2011Applicant: Quellan, Inc.Inventors: Bruce C. Schmukler, Arvind Raghavan, Ziba Nami, Jyothi Emmanuel Peddi, Andrew Joo Kim, Michael G. Vrazel, Charles E. Summers
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Patent number: 7804760Abstract: A circuit can process a sample of a signal to emulate, simulate, or model an effect on the signal. Thus, an emulation circuit can produce a representation of a real-world signal transformation by processing the signal according to one or more signal processing parameters that are characteristic of the real-world signal transformation. The emulation circuit can apply analog signal processing and/or mixed signal processing to the signal. The signal processing can comprise feeding the signal through two signal paths, each having a different delay, and creating a weighted sum of the outputs of the two signal paths. The signal processing can also (or alternatively) comprise routing the signal through a network of delay elements, wherein a bank of switching or routing elements determines the route and thus the resulting delay.Type: GrantFiled: August 23, 2006Date of Patent: September 28, 2010Assignee: Quellan, Inc.Inventors: Bruce C. Schmukler, Arvind Raghavan, Ziba Nami, Jyothi Emmanuel Peddi, Andrew Joo Kim, Michael G. Vrazel, Charles E. Summers
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Publication number: 20100197233Abstract: Signals propagating on an aggressor communication channel can cause detrimental interference in a victim communication channel. A signal processing circuit can generate an interference cancellation signal that, when applied to the victim communication channel, cancels the detrimental interference. The signal processing circuit can dynamically adjust or update two or more aspects of the interference cancellation signal, such as an amplitude or gain parameter and a phase or delay parameter. Via the dynamic adjustments, the signal processing circuit can adapt to changing conditions, thereby maintaining an acceptable level of interference cancellation in a fluctuating operating environment. A control circuit that implements the parametric adjustments can have at least two modes of operation, one for adjusting the amplitude parameter and one for adjusting the phase parameter. The modes can be selectable or can be intermittently available, for example.Type: ApplicationFiled: April 9, 2010Publication date: August 5, 2010Inventors: Andrew Joo Kim, Edward Gebara, Bruce C. Schmukler, Mark W. Dickmann, Michael F. Farrell, Michael G. Vrazel, David Anthony Stelliga, Joy Laskar, Charles E. Summers
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Patent number: 7725079Abstract: Signals propagating on an aggressor communication channel can cause detrimental interference in a victim communication channel. A signal processing circuit can generate an interference cancellation signal that, when applied to the victim communication channel, cancels the detrimental interference. The signal processing circuit can dynamically adjust or update two or more aspects of the interference cancellation signal, such as an amplitude or gain parameter and a phase or delay parameter. Via the dynamic adjustments, the signal processing circuit can adapt to changing conditions, thereby maintaining an acceptable level of interference cancellation in a fluctuating operating environment. A control circuit that implements the parametric adjustments can have at least two modes of operation, one for adjusting the amplitude parameter and one for adjusting the phase parameter. The modes can be selectable or can be intermittently available, for example.Type: GrantFiled: June 9, 2006Date of Patent: May 25, 2010Assignee: Quellan, Inc.Inventors: Andrew Joo Kim, Edward Gebara, Bruce C. Schmukler, Mark W. Dickmann, Michael F. Farrell, Michael G. Vrazel, David Anthony Stelliga, Joy Laskar, Charles E. Summers
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Publication number: 20100039923Abstract: Signals propagating in one communication channel can generate crosstalk interference in another communication channel. A crosstalk cancellation device can process the signals causing the crosstalk interference and generate a crosstalk cancellation signal that can compensate for the crosstalk when applied to the channel receiving crosstalk interference. The crosstalk cancellation device can include a model of the crosstalk effect that generates a signal emulating the actual crosstalk both in form an in timing. The crosstalk cancellation device can include a controller that monitors crosstalk-compensated communication signals and adjusts the model to enhance crosstalk cancellation performance. The crosstalk cancellation device can have a mode of self configuration or calibration in which defined test signals can be transmitted on the crosstalk-generating channel and the crosstalk-receiving channel.Type: ApplicationFiled: October 19, 2009Publication date: February 18, 2010Applicant: Quellan, Inc.Inventors: Andrew Joo Kim, Michael G. Vrazel, Sanjay Bajekal, Charles Summers
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Patent number: 7626916Abstract: Signals propagating in one communication channel can generate crosstalk interference in another communication channel. A crosstalk cancellation device can process the signals causing the crosstalk interference and generate a crosstalk cancellation signal that can compensate for the crosstalk when applied to the channel receiving crosstalk interference. The crosstalk cancellation device can include a model of the crosstalk effect that generates a signal emulating the actual crosstalk both in form an in timing. The crosstalk cancellation device can include a controller that monitors crosstalk-compensated communication signals and adjusts the model to enhance crosstalk cancellation performance. The crosstalk cancellation device can have a mode of self configuration or calibration in which defined test signals can be transmitted on the crosstalk-generating channel and the crosstalk-receiving channel.Type: GrantFiled: January 19, 2006Date of Patent: December 1, 2009Assignee: Quellan, Inc.Inventors: Andrew Joo Kim, Michael G. Vrazel, Sanjay Bajekal, Charles Summers
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Patent number: 7352824Abstract: Decreasing the average transmitted power in an optical fiber communication channel using multilevel amplitude modulation in conjunction with Pulse Position Modulation (PPM). This multilevel PPM method does not entail any tradeoff between decreased power per channel and channel bandwidth, enabling a lower average transmitted power compared to On/Off Keying (OOK) with no reduction in aggregate data rate. Therefore, multilevel PPM can be used in high-speed Dense Wavelength Division Multiplexed (DWDM) systems where the maximum number of channels is traditionally limited by nonlinear effects such as self-phase modulation (SPM), cross-phase modulation (XPM), four-wave mixing (FWM), stimulated Brillouin scattering (SBS), and stimulated Raman scattering (SRS). This modulation technique can enable an increased number of channels in DWDM systems, thereby increasing aggregate data rates within those systems.Type: GrantFiled: October 5, 2006Date of Patent: April 1, 2008Assignee: Quellan, Inc.Inventors: Michael G. Vrazel, Stephen E. Ralph, Vincent Mark Hietala
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Patent number: 7307569Abstract: Data throughput rates are increased in an optical fiber communication system without requiring replacement of the existing optical fiber in a link. Channel throughput is increased by upgrading the components and circuitry in the head and terminal of an optical fiber communication system link. Aggregate throughput in a fiber optic link is increased beyond the range of conventional Wavelength Division Multiplexed (WDM) upgrades, while precluding the necessity of replacing existing fiber plants. The increase in system throughput is achieved by using advanced modulation techniques to encode greater amounts of data into the transmitted spectrum of a channel, thereby increasing the spectral efficiency of each channel. This novel method of increasing transmission capacity by upgrading the head and terminal of the system to achieve greater spectral efficiency and hence throughput, alleviates the need to replace existing fiber plants.Type: GrantFiled: November 15, 2006Date of Patent: December 11, 2007Assignee: Quellan, Inc.Inventors: Michael G. Vrazel, Stephen E. Ralph, Joy Laskar, Sungyong Jung, Vincent Mark Hietala, Edward Gebara
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Patent number: 7173551Abstract: Data throughput rates are increased in an optical fiber communication system without requiring replacement of the existing optical fiber in a link. Channel throughput is increased by upgrading the components and circuitry in the head and terminal of an optical fiber communication system link. Aggregate throughput in a fiber optic link is increased beyond the range of conventional Wavelength Division Multiplexed (WDM) upgrades, while precluding the necessity of replacing existing fiber plants. The increase in system throughput is achieved by using advanced modulation techniques to encode greater amounts of data into the transmitted spectrum of a channel, thereby increasing the spectral efficiency of each channel. This novel method of increasing transmission capacity by upgrading the head and terminal of the system to achieve greater spectral efficiency and hence throughput, alleviates the need to replace existing fiber plants.Type: GrantFiled: December 21, 2001Date of Patent: February 6, 2007Assignee: Quellan, Inc.Inventors: Michael G. Vrazel, Stephen E. Ralph, Joy Laskar, Sungyong Jung, Vincent Mark Hietala, Edward Gebara
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Patent number: 7149256Abstract: Decreasing the average transmitted power in an optical fiber communication channel using multilevel amplitude modulation in conjunction with Pulse Position Modulation (PPM). This multilevel PPM method does not entail any tradeoff between decreased power per channel and channel bandwidth, enabling a lower average transmitted power compared to On/Off Keying (OOK) with no reduction in aggregate data rate. Therefore, multilevel PPM can be used in high-speed Dense Wavelength Division Multiplexed (DWDM) systems where the maximum number of channels is traditionally limited by nonlinear effects such as self-phase modulation (SPM), cross-phase modulation (XPM), four-wave mixing (FWM), stimulated Brillouin scattering (SBS), and stimulated Raman scattering (SRS). This modulation technique can enable an increased number of channels in DWDM systems, thereby increasing aggregate data rates within those systems.Type: GrantFiled: March 29, 2002Date of Patent: December 12, 2006Assignee: Quellan, Inc.Inventors: Michael G. Vrazel, Stephen E. Ralph, Vincent Mark Hietala
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Patent number: 7050388Abstract: Signals propagating in one communication channel can generate crosstalk interference in another communication channel. A crosstalk cancellation device can process the signals causing the crosstalk interference and generate a crosstalk cancellation signal that can compensate for the crosstalk when applied to the channel receiving crosstalk interference. The crosstalk cancellation device can include a model of the crosstalk effect that generates a signal emulating the actual crosstalk both in form an in timing. The crosstalk cancellation device can include a controller that monitors crosstalk-compensated communication signals and adjusts the model to enhance crosstalk cancellation performance. The crosstalk cancellation device can have a mode of self configuration or calibration in which defined test signals can be transmitted on the crosstalk-generating channel and the crosstalk-receiving channel.Type: GrantFiled: August 5, 2004Date of Patent: May 23, 2006Assignee: Quellan, Inc.Inventors: Andrew Joo Kim, Michael G. Vrazel, Sanjay Bajekal, Charles Summers
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Publication number: 20030198478Abstract: The present invention combines standard binary ASK modulation with differential PSK (DPSK) modulation to achieve a two times or doubled increase in data throughput and a spectral efficiency of 1 bit/s/Hz. In other words, the present invention can be characterized as overlaying DPSK onto a regular binary ASK transmission. Each bit generated by the inventive modulation technique can have one of two intensities and one of two phases such that every symbol transmitted can comprise two bits. The present invention encodes (and subsequently decodes) information into both the phase and amplitude of a carrier signal. This translates into less complex circuitry and lower costs for a receiver in the inventive system. This also means that phase integrity does not need to be maintained throughout the communications system like that of a coherent QAM communications system because the relative phase instead of the absolute phase is tracked.Type: ApplicationFiled: April 23, 2003Publication date: October 23, 2003Applicant: Quellan, Inc.Inventors: Michael G. Vrazel, Stephen E. Ralph
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Publication number: 20030072050Abstract: Decreasing the average transmitted power in an optical fiber communication channel using multilevel amplitude modulation in conjunction with Pulse Position Modulation (PPM). This multilevel PPM method does not entail any tradeoff between decreased power per channel and channel bandwidth, enabling a lower average transmitted power compared to On/Off Keying (OOK) with no reduction in aggregate data rate. Therefore, multilevel PPM can be used in high-speed Dense Wavelength Division Multiplexed (DWDM) systems where the maximum number of channels is traditionally limited by nonlinear effects such as self-phase modulation (SPM), cross-phase modulation (XPM), four-wave mixing (FWM), stimulated Brillouin scattering (SBS), and stimulated Raman scattering (SRS). This modulation technique can enable an increased number of channels in DWDM systems, thereby increasing aggregate data rates within those systems.Type: ApplicationFiled: March 29, 2002Publication date: April 17, 2003Applicant: Quellan, Inc.Inventors: Michael G. Vrazel, Stephen E. Ralph, Vincent Mark Hietala
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Publication number: 20020167693Abstract: Data throughput rates are increased in an optical fiber communication system without requiring replacement of the existing optical fiber in a link. Channel throughput is increased by upgrading the components and circuitry in the head and terminal of an optical fiber communication system link. Aggregate throughput in a fiber optic link is increased beyond the range of conventional Wavelength Division Multiplexed (WDM) upgrades, while precluding the necessity of replacing existing fiber plants. The increase in system throughput is achieved by using advanced modulation techniques to encode greater amounts of data into the transmitted spectrum of a channel, thereby increasing the spectral efficiency of each channel. This novel method of increasing transmission capacity by upgrading the head and terminal of the system to achieve greater spectral efficiency and hence throughput, alleviates the need to replace existing fiber plants.Type: ApplicationFiled: December 21, 2001Publication date: November 14, 2002Applicant: Quellan, Inc.Inventors: Michael G. Vrazel, Stephen E. Ralph, Joy Laskar, Sungyong Jung, Vincent Mark Hietala, Edward Gebara