Patents by Inventor Choudhury A. AL SAYEED

Choudhury A. AL SAYEED 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).

  • Patent number: 9806803
    Abstract: A frequency offset detection method in an optical spectrum measurement device, implemented by a controller, includes determining a reference optical spectrum based on expected channels and their associated spectral occupancy without extracting any information from actual received optical spectrum; obtaining a measured optical spectrum from the optical spectrum measurement device; and performing a frequency offset control loop using the reference optical spectrum and the measured optical spectrum to correct frequency offset in the optical spectrum measurement device. The optical spectrum measurement device can be an Optical Channel Monitor and the measured optical spectrum can include optical channels partially overlapping one another in Nyquist or in super-Nyquist spacing.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: October 31, 2017
    Assignee: Ciena Corporation
    Inventors: David C. Bownass, Bing Liu, Alex W. Mackay, Choudhury A. Al Sayeed
  • Publication number: 20170279526
    Abstract: A frequency offset detection method in an optical spectrum measurement device, implemented by a controller, includes determining a reference optical spectrum based on expected channels and their associated spectral occupancy without extracting any information from actual received optical spectrum; obtaining a measured optical spectrum from the optical spectrum measurement device; and performing a frequency offset control loop using the reference optical spectrum and the measured optical spectrum to correct frequency offset in the optical spectrum measurement device. The optical spectrum measurement device can be an Optical Channel Monitor and the measured optical spectrum can include optical channels partially overlapping one another in Nyquist or in super-Nyquist spacing.
    Type: Application
    Filed: March 25, 2016
    Publication date: September 28, 2017
    Inventors: David C. BOWNASS, Bing LIU, Alex W. MACKAY, Choudhury A. AL SAYEED
  • Patent number: 9768902
    Abstract: Systems and methods to control optical signals in a spectrally overlapped, flexible grid spectrum system include receiving measured power within a control bandwidth for an optical signal, wherein the control bandwidth is less than a spectral occupancy of the optical signal and equal to or greater than a resolution bandwidth of a measurement device configured to measure the measured power; and controlling the optical signal based on the measured power and a target power within the control bandwidth. The optical signals can include Nyquist spaced or super Nyquist spaced signals in a media-channel.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: September 19, 2017
    Assignee: Ciena Corporation
    Inventors: Choudhury A. Al Sayeed, Edward Chen, Paul Chedore, Scott Kohlert
  • Patent number: 9756405
    Abstract: Systems and methods for controlling an optical switch via one of a control plane and Software Defined Networking (SDN) include associating one or more managed endpoints with one or more line ports of an optical switch; receiving state information for the one or more managed endpoints over a session associated with one of the control plane and the SDN; and controlling switching of the one or more line ports based on the state information for the one or more managed endpoints. The optical switch is an all-optical device which does not have access to digital signal quality information of associated signals.
    Type: Grant
    Filed: October 6, 2015
    Date of Patent: September 5, 2017
    Assignee: Ciena Corporation
    Inventors: Gerard Leo Swinkels, Darren Hennigar, Choudhury A. Al Sayeed
  • Publication number: 20170117983
    Abstract: Systems and methods to control optical signals in a spectrally overlapped, flexible grid spectrum system include receiving measured power within a control bandwidth for an optical signal, wherein the control bandwidth is less than a spectral occupancy of the optical signal and equal to or greater than a resolution bandwidth of a measurement device configured to measure the measured power; and controlling the optical signal based on the measured power and a target power within the control bandwidth. The optical signals can include Nyquist spaced or super Nyquist spaced signals in a media-channel.
    Type: Application
    Filed: October 22, 2015
    Publication date: April 27, 2017
    Inventors: Choudhury A. AL SAYEED, Edward CHEN, Paul CHEDORE, Scott KOHLERT
  • Publication number: 20170099530
    Abstract: Systems and methods for controlling an optical switch via one of a control plane and Software Defined Networking (SDN) include associating one or more managed endpoints with one or more line ports of an optical switch; receiving state information for the one or more managed endpoints over a session associated with one of the control plane and the SDN; and controlling switching of the one or more line ports based on the state information for the one or more managed endpoints. The optical switch is an all-optical device which does not have access to digital signal quality information of associated signals.
    Type: Application
    Filed: October 6, 2015
    Publication date: April 6, 2017
    Inventors: Gerard Leo SWINKELS, Darren HENNIGAR, Choudhury A. AL SAYEED
  • Publication number: 20170085316
    Abstract: Systems and methods for improving optical restoration time in a network include maintaining a status of wavelength load for a plurality of optical links in the network; utilizing the wavelength load to estimate a restoration time for one or more wavelengths being added to each of the plurality of optical links; and determining one or more restoration paths for the one or more wavelengths in the network and considering a total service restoration time in selecting a path for each of the one or more wavelengths, wherein each of the one or more restoration paths comprises one or more of the plurality of optical links.
    Type: Application
    Filed: September 23, 2015
    Publication date: March 23, 2017
    Inventors: Choudhury A. Al Sayeed, Gerard Leo Swinkels
  • Patent number: 9577763
    Abstract: Spectrum control systems and methods are implemented to minimize power spectral density (PSD) offsets by adjusting gain of optical amplifiers in an optical section. The optical section is a logical boundary from one optical signal access point to a next adjacent optical signal access point. The systems and methods include estimating PSD offset from a given target for a peak channel at each span in the optical section, wherein the estimated PSD offset is divided at each span into two components including a self-introduced offset and an uncompensated offset from upstream; generating, for each span, a separate controller response for the self-introduced offset and the uncompensated offset from upstream; and controlling the gain of the optical amplifiers based on the separate controller response for the self-introduced offset and the uncompensated offset from upstream, for each span.
    Type: Grant
    Filed: April 22, 2015
    Date of Patent: February 21, 2017
    Assignee: Ciena Corporation
    Inventors: Choudhury A. Al Sayeed, David C. Bownass, David W. Boertjes, Shiyu Gao
  • Patent number: 9485013
    Abstract: A method for optical dark section conditioning includes determining a section in an optical network is a dark section that includes connected fiber spans that are functional with no traffic carrying channels present thereon; and causing generation of at least one of broadband noise and a signal at a head end of the dark section. An apparatus configured to perform optical dark section conditioning includes logic configured to determine a section in an optical network is a dark section that includes connected fiber spans that are functional with no traffic carrying channels present thereon; and logic configured to cause generation of at least one of broadband noise and a signal at a head end of the dark section.
    Type: Grant
    Filed: November 13, 2015
    Date of Patent: November 1, 2016
    Assignee: Ciena Corporation
    Inventors: Choudhury A. Al Sayeed, David Miedema, Loren S. Berg, Dave C. Bownass
  • Publication number: 20160315711
    Abstract: Spectrum control systems and methods are implemented to minimize power spectral density (PSD) offsets by adjusting gain of optical amplifiers in an optical section. The optical section is a logical boundary from one optical signal access point to a next adjacent optical signal access point.
    Type: Application
    Filed: April 22, 2015
    Publication date: October 27, 2016
    Inventors: Choudhury A. AL SAYEED, David C. BOWNASS, David W. BOERTJES, Shiyu GAO
  • Patent number: 9344191
    Abstract: A method, a controller, and an optical section include performing an analysis to determine an amount of power offset on any in-service channels in an optical section due to a capacity change with a channel; defining a step size to ensure the capacity change does not exceed an offset limit based on the analysis; performing the capacity change in one or more iterations using the step size to limit the capacity change; and performing an optimization between each of the one or more iterations to adjust amplifier gains in the optical section to compensate for offsets on the in-service channels caused by a previous iteration.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: May 17, 2016
    Assignee: Ciena Corporation
    Inventors: Choudhury A. Al Sayeed, Mohammad Mehdi Mansouri Rad, Dave C. Bownass, Loren S. Berg
  • Publication number: 20160134390
    Abstract: A method, an optical node, and an optical network include a power controller configured to bring channels in-service in parallel over multiple cascaded optical nodes quickly, efficiently, and in a non-service affecting manner. The method, node, and network utilize multiple states of a control loop that maintains a stable response in downstream optical nodes as channels are added in parallel. Further, the power controller is configured to operate independently alleviating dependencies on other power controllers and removing the need for coordination between power controllers. The method, node, and network provide efficient turn up of dense wave division multiplexing (DWDM) services which is critical to optical layer functionality including optical layer restoration.
    Type: Application
    Filed: January 20, 2016
    Publication date: May 12, 2016
    Inventors: Choudhury AL SAYEED, David C. BOWNASS, Loren S. BERG, David W. BOERTJES
  • Publication number: 20160072575
    Abstract: A method for optical dark section conditioning includes determining a section in an optical network is a dark section that includes connected fiber spans that are functional with no traffic carrying channels present thereon; and causing generation of at least one of broadband noise and a signal at a head end of the dark section. An apparatus configured to perform optical dark section conditioning includes logic configured to determine a section in an optical network is a dark section that includes connected fiber spans that are functional with no traffic carrying channels present thereon; and logic configured to cause generation of at least one of broadband noise and a signal at a head end of the dark section.
    Type: Application
    Filed: November 13, 2015
    Publication date: March 10, 2016
    Inventors: Choudhury A. AL SAYEED, David MIEDEMA, Loren S. BERG, Dave C. BOWNASS
  • Patent number: 9276696
    Abstract: A method, an optical node, and an optical network include a power controller configured to bring channels in-service in parallel over multiple cascaded optical nodes quickly, efficiently, and in a non-service affecting manner. The method, node, and network utilize multiple states of a control loop that maintains a stable response in downstream optical nodes as channels are added in parallel. Further, the power controller is configured to operate independently alleviating dependencies on other power controllers and removing the need for coordination between power controllers. The method, node, and network provide efficient turn up of dense wave division multiplexing (DWDM) services which is critical to optical layer functionality including optical layer restoration.
    Type: Grant
    Filed: October 19, 2012
    Date of Patent: March 1, 2016
    Assignee: Ciena Corporation
    Inventors: Choudhury A. Al Sayeed, David C. Bownass, Loren S. Berg, David W. Boertjes
  • Patent number: 9252913
    Abstract: Embodiments of the disclosure are directed to optical dark section conditioning. An embodiment generates at least one of a broadband noise or signal at the head end of a section for a first module of the section; and operates all other modules of the section in gain control mode.
    Type: Grant
    Filed: May 6, 2013
    Date of Patent: February 2, 2016
    Assignee: Ciena Corporation
    Inventors: Choudhury A. Al Sayeed, David Miedema, Loren S. Berg, Dave C. Bownass
  • Publication number: 20150117858
    Abstract: A method, a controller, and an optical section include performing an analysis to determine an amount of power offset on any in-service channels in an optical section due to a capacity change with a channel; defining a step size to ensure the capacity change does not exceed an offset limit based on the analysis; performing the capacity change in one or more iterations using the step size to limit the capacity change; and performing an optimization between each of the one or more iterations to adjust amplifier gains in the optical section to compensate for offsets on the in-service channels caused by a previous iteration.
    Type: Application
    Filed: October 31, 2013
    Publication date: April 30, 2015
    Applicant: CIENA CORPORATION
    Inventors: Choudhury A. AL SAYEED, Mohammad Mehdi Mansouri Rad, Dave C. BOWNASS, Loren S. BERG
  • Publication number: 20140328583
    Abstract: Embodiments of the disclosure are directed to optical dark section conditioning. An embodiment generates at least one of a broadband noise or signal at the head end of a section for a first module of the section; and operates all other modules of the section in gain control mode.
    Type: Application
    Filed: May 6, 2013
    Publication date: November 6, 2014
    Applicant: Ciena Corporation
    Inventors: Choudhury A. AL SAYEED, David Miedema, Loren S. Berg, Dave C. Bownass
  • Publication number: 20140112660
    Abstract: A method, an optical node, and an optical network include a power controller configured to bring channels in-service in parallel over multiple cascaded optical nodes quickly, efficiently, and in a non-service affecting manner. The method, node, and network utilize multiple states of a control loop that maintains a stable response in downstream optical nodes as channels are added in parallel. Further, the power controller is configured to operate independently alleviating dependencies on other power controllers and removing the need for coordination between power controllers. The method, node, and network provide efficient turn up of dense wave division multiplexing (DWDM) services which is critical to optical layer functionality including optical layer restoration.
    Type: Application
    Filed: October 19, 2012
    Publication date: April 24, 2014
    Applicant: CIENA CORPORATION
    Inventors: Choudhury A. AL SAYEED, David C. BOWNASS, Loren S. BERG, David W. BOERTJES
  • Patent number: 8509621
    Abstract: An optical add/drop multiplexer (OADM) having an Add path for adding optical channel signals input through a plurality of Add ports to an outbound dense wavelength division multiplexed (DWDM) signal, and a Drop path for switching selected channels from an inbound DWDM signal to one or more of a plurality of Drop ports. The OADM has a loopback connection between the Add path and the Drop path. The loopback connection couples a selected loopback channel wavelength from the Add path to the Drop path. The physical connection between a transceiver and the OADM can be verified by connecting the transmitter to an Add port of the OADM and the receiver to a Drop port of the OADM. The OADM is controlled to switch the selected loopback channel wavelength in the Drop path to at least one intended drop port to which the receiver should be connected, and the transmitter is controlled to transmit a predetermined test signal using the loopback channel wavelength.
    Type: Grant
    Filed: February 16, 2011
    Date of Patent: August 13, 2013
    Assignee: Ciena Corporation
    Inventors: David Boertjes, Marc Desjardins, Choudhury Al Sayeed
  • Publication number: 20110200324
    Abstract: An optical add/drop multiplexer (OADM) having an Add path for adding optical channel signals input through a plurality of Add ports to an outbound dense wavelength division multiplexed (DWDM) signal, and a Drop path for switching selected channels from an inbound DWDM signal to one or more of a plurality of Drop ports. The OADM has a loopback connection between the Add path and the Drop path. The loopback connection couples a selected loopback channel wavelength from the Add path to the Drop path. The physical connection between a transceiver and the OADM can be verified by connecting the transmitter to an Add port of the OADM and the receiver to a Drop port of the OADM. The OADM is controlled to switch the selected loopback channel wavelength in the Drop path to at least one intended drop port to which the receiver should be connected, and the transmitter is controlled to transmit a predetermined test signal using the loopback channel wavelength.
    Type: Application
    Filed: February 16, 2011
    Publication date: August 18, 2011
    Applicant: CIENA CORPORATION
    Inventors: David BOERTJES, Marc DESJARDINS, Choudhury AL SAYEED