Patents by Inventor Daniel Kilper
Daniel Kilper 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: 11496213Abstract: A method of interrogating a WDM optical communication system is provided to obtain one or more performance parameters. In accordance with the method, an optical probe wavelength is generated and possibly modulated in a prescribed manner. The probe signal is transmitted along a selected optical path through the WDM optical communication system for a duration of time that is less than a response time of network elements that impact signal quality along the selected optical path.Type: GrantFiled: December 5, 2016Date of Patent: November 8, 2022Assignees: ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIVERSITY OF ARIZONA, THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORKInventors: Daniel Kilper, Atiyah Sayyidah Ahsan, Keren Bergman
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Patent number: 10887007Abstract: A method is provided for determining the gain spectrum of an optical amplifier such as an erbium doped optical amplifier (EDFA). In accordance with the method, an optical amplifier such as an EDFA that is to accommodate a specified number of channels at different optical wavelengths is provided. A subset of the specified number of channels at which gain is to be measured is selected. The number of channels in the subset is determined based at least in part on a number of samples required by the Nyquist sampling theorem to reconstruct the gain spectrum. A gain value for each channel in the selected subset of channels is measured for a probe signal that does not perturb the gain spectrum of the EDFA by more than a prescribed amount. The gain spectrum for the EDFA is constructed from the measured gain values.Type: GrantFiled: February 22, 2018Date of Patent: January 5, 2021Assignee: ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIVERSITY OF ARIZONAInventors: Daniel Kilper, Weiyang Mo
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Patent number: 10644801Abstract: A proactive and non-obtrusive channel probing scheme is provided to accurately predict channel power, gain, and optical signal to noise ratio (OSNR) without disrupting the existing connections. In one example, using a probe signal with 5 ?s pulse duration in a single-hop network, rapid wavelength switching is achieved with power excursions less than or equal to 0.2 dB for different loading configurations.Type: GrantFiled: June 29, 2017Date of Patent: May 5, 2020Assignee: ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIVERSITY OF ARIZONAInventors: Daniel Kilper, Weiyang Mo, Houman Rastegarfar, Mariya A. Bhopalwala
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Publication number: 20200028584Abstract: A method is provided for determining the gain spectrum of an optical amplifier such as an erbium doped optical amplifier (EDFA). In accordance with the method, an optical amplifier such as an EDFA that is to accommodate a specified number of channels at different optical wavelengths is provided. A subset of the specified number of channels at which gain is to be measured is selected. The number of channels in the subset is determined based at least in part on a number of samples required by the Nyquist sampling theorem to reconstruct the gain spectrum. A gain value for each channel in the selected subset of channels is measured for a probe signal that does not perturb the gain spectrum of the EDFA by more than a prescribed amount. The gain spectrum for the EDFA is constructed from the measured gain values.Type: ApplicationFiled: February 22, 2018Publication date: January 23, 2020Inventors: Daniel Kilper, Weiyang Mo
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Publication number: 20190190604Abstract: A proactive and non-obtrusive channel probing scheme is provided to accurately predict channel power, gain, and optical signal to noise ratio (OSNR) without disrupting the existing connections. In one example, using a probe signal with 5 ?s pulse duration in a single-hop network, rapid wavelength switching is achieved with power excursions less than or equal to 0.2 dB for different loading configurations.Type: ApplicationFiled: June 29, 2017Publication date: June 20, 2019Applicant: ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIVERSITY OF ARIZONAInventors: Daniel KILPER, Weiyang MO, Houman RASTEGARFAR, Mariya A. BHOPALWALA
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Patent number: 10263722Abstract: A method for transmitting data over an optical communication system is performed by sequentially tuning a laser beam among a plurality of optical wavelengths. At least one data signal is modulated onto the plurality of optical wavelengths by sequentially switching the modulation of the data signal among the plurality of optical wavelengths such that at any given time the data signal is only modulated onto a single one of the optical wavelengths. The sequential switching is performed at a rate equal to or greater than a response time of one or more optical amplifiers used for amplifying the optical wavelengths.Type: GrantFiled: October 14, 2015Date of Patent: April 16, 2019Assignee: ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIVERSITY OF ARIZONAInventor: Daniel Kilper
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Patent number: 10158447Abstract: An optical communication system includes a plurality of optical system nodes, a plurality of optical space switches and a plurality of optical fibers. The plurality of optical system nodes each includes at least one reconfigurable optical add/drop multiplexer (ROADM). The optical system nodes each have at least one client side port and at least one line side port. Each optical space switch is operatively coupled to the line side port of one of the plurality of optical system nodes. Each of the optical fibers couples one of the optical space switches to another of the optical space switches.Type: GrantFiled: September 11, 2015Date of Patent: December 18, 2018Assignees: THE ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIVERSITY OF ARIZONA, THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORKInventors: Daniel Kilper, Keren Bergman, Gil Zussman, Berk Birand
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Publication number: 20180287697Abstract: A method of interrogating a WDM optical communication system is provided to obtain one or more performance parameters. In accordance with the method, an optical probe wavelength is generated and possibly modulated in a prescribed manner. The probe signal is transmitted along a selected optical path through the WDM optical communication system for a duration of time that is less than a response time of network elements that impact signal quality along the selected optical path.Type: ApplicationFiled: December 5, 2016Publication date: October 4, 2018Inventors: Daniel KILPER, Atiyah Sayyidah AHSAN, Keren BERGMAN
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Publication number: 20170279557Abstract: An optical communication system includes a plurality of optical system nodes, a plurality of optical space switches and a plurality of optical fibers. The plurality of optical system nodes each includes at least one reconfigurable optical add/drop multiplexer (ROADM). The optical system nodes each have at least one client side port and at least one line side port. Each optical space switch is operatively coupled to the line side port of one of the plurality of optical system nodes. Each of the optical fibers couples one of the optical space switches to another of the optical space switches.Type: ApplicationFiled: September 11, 2015Publication date: September 28, 2017Inventors: Daniel KILPER, Keren BERGMAN, GIL ZUSSMAN, BERK BIRAND
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Publication number: 20170244510Abstract: A method for transmitting data over an optical communication system is performed by sequentially tuning a laser beam among a plurality of optical wavelengths. At least one data signal is modulated onto the plurality of optical wavelengths by sequentially switching the modulation of the data signal among the plurality of optical wavelengths such that at any given time the data signal is only modulated onto a single one of the optical wavelengths. The sequential switching is performed at a rate equal to or greater than a response time of one or more optical amplifiers used for amplifying the optical wavelengths.Type: ApplicationFiled: October 14, 2015Publication date: August 24, 2017Inventor: Daniel KILPER
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Publication number: 20090059354Abstract: Optical amplifier transient control methods and apparatus which limit the extent of cumulative transient gain errors in the rapid control of multiple optical amplifiers in a communication system. In an exemplary embodiment, if the input power to an optical amplifier drops below a predetermined threshold, the gain of the amplifier is set to clamp the output power of the amplifier to its initial level less the threshold, thereby preventing the continuous growth of gain error. This is based on the assumption that once the input power goes below the threshold, it should no longer go above the threshold until the transient condition is corrected. The present invention can operate to handle down- as well as up-transient events and is not amplifier technology dependent.Type: ApplicationFiled: August 29, 2007Publication date: March 5, 2009Inventors: Daniel Kilper, Christopher A. White
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Patent number: 7460785Abstract: An optical performance monitor (OPM), e.g., for use in an optical network. The OPM may be configured to characterize one or more impairments in an optical signal modulated with data. The OPM has an optical autocorrelator configured to sample the autocorrelation function of the optical signal, e.g., using two-photon absorption. Autocorrelation points at various bit delays independently or in combination with average optical power may be used to detect and/or quantify one or more of the following: loss of data modulation, signal contrast, pulse broadening, peak power fluctuations, timing jitter, and deviations from the pseudo-random character of data. In addition, the OPM may be configured to perform Fourier transformation based on the autocorrelation points to obtain corresponding spectral components. The spectral components may be used to detect and/or quantify one or more of chromatic dispersion, polarization mode dispersion, and misalignment of a pulse carver and data modulator.Type: GrantFiled: March 28, 2002Date of Patent: December 2, 2008Assignee: Lucent Technologies Inc.Inventors: Mihaela Dinu, Hernando Garcia, Daniel Kilper, Wayne H. Knox, Howard R. Stuart, Chunhui Xu
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Patent number: 7149407Abstract: An orthogonal heterodyne in-band optical signal-to-noise-ratio (OSNR) monitoring method and apparatus that use the polarization characteristics of two narrow bandwidth filtered optical spectral components which is not only insensitive to the effects of polarization mode dispersion (PMD) and inter-channel cross-phase modulation (XPM) induced nonlinear polarization scattering, but also independent of bit rate and modulation format. The monitoring method is demonstrated for both linear and nonlinear systems.Type: GrantFiled: February 28, 2006Date of Patent: December 12, 2006Assignee: Lucent Technologies Inc.Inventors: Christopher Doerr, Daniel Kilper, Lothar Moeller, Roland Ryf, Chongjiin Xie
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Publication number: 20060023297Abstract: In an optical transmission system, operations of certain elements are adjusted in an individualized manner after detecting a change in the total optical power level corresponding to multiple optical channels in a link of the system in order to control transients in those channels. For example, in response to a sudden drop in the number of channels resulting from a fiber cut, the power levels of the optical pumps in a Raman amplifier in an OADM are adjusted to reduce transient gain errors in the surviving channels, where the adjustment to the pump power level for each different optical pump is a function of both the detected change in the total optical power level and at least one specified coefficient for that particular optical pump, in order to handle non-linearities in the response of the Raman amplifier to the sudden drop in the number of optical channels.Type: ApplicationFiled: July 30, 2004Publication date: February 2, 2006Inventors: Daniel Kilper, Claude Martell, Narasimhan Raghavan, David Sadler, Christopher White
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Publication number: 20060024057Abstract: A channel-growth plan for an optical transmission system selects channels such that the transients that result in the channels that survive a network failure, such as an upstream fiber cut, are either minimized or effectively handled by some transient-control technique. In one embodiment, the growth plan may try to keep post-transient surviving channel total power gain equal to the pre-transient total power gain. Alternatively, the growth plan may try to distribute the surviving channels uniformly over the pre-transient channel-frequency range. Other manifestations are to keep (1) the average power of the surviving channels substantially equal to the average power of the pre-transient channels or (2) the average power of the post-transient surviving channels substantially equal to the power level of a specified channel. Transient-control can be balanced with conventional low-cost and high-performance goals to provide an effective hybrid channel-growth plan.Type: ApplicationFiled: July 30, 2004Publication date: February 2, 2006Inventors: Daniel Kilper, Narasimhan Raghavan, Elizabeth Richey, Sydney Taegar, Christopher White
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Publication number: 20050244154Abstract: An optical performance monitor (OPM) adapted to (i) sample an autocorrelation function corresponding to an optical signal transmitted in an optical network and (ii) based on the sampling, characterize two or more impairments concurrently present in the optical signal. In one embodiment, the OPM has an optical autocorrelator (OAC) coupled to a signal processor (SP). The OAC receives the optical signal from the network, generates two or more samples of its autocorrelation function, and applies said samples to the SP. The SP processes the samples and generates two or more signal metrics. Based on the signal metrics and reference data corresponding to the impairments, the SP then obtains a measure of each of the impairments.Type: ApplicationFiled: May 3, 2004Publication date: November 3, 2005Inventors: Mihaela Dinu, Daniel Kilper, Howard Stuart
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Publication number: 20050052727Abstract: An optical device having a semiconductor optical amplifier (SOA) coupled to an optical filter, which device may be used for optical performance monitoring. One embodiment of the invention provides an optical regenerator/monitor (RM), in which an SOA is used both for optical regeneration of a communication signal applied to the RM and for evaluation of the quality of that signal. The RM has (i) a 2R regenerator, which includes the SOA and an optical filter, and (ii) a relatively simple signal processor configured to receive optical signals from two or more sampling points located at the regenerator. In one configuration, the processor evaluates the quality of the communication signal by comparing optical power tapped from the input and output of the regenerator. The RM, so configured, can be used, for example, to monitor chromatic dispersion and/or optical noise in the communication signal.Type: ApplicationFiled: August 11, 2003Publication date: March 10, 2005Inventors: Daniel Kilper, Juerg Leuthold, Philipp Vorreau
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Publication number: 20020176129Abstract: An optical performance monitor (OPM), e.g., for use in an optical network. The OPM may be configured to characterize one or more impairments in an optical signal modulated with data. The OPM has an optical autocorrelator configured to sample the autocorrelation function of the optical signal, e.g., using two-photon absorption. Autocorrelation points at various bit delays independently or in combination with average optical power may be used to detect and/or quantify one or more of the following: loss of data modulation, signal contrast, pulse broadening, peak power fluctuations, timing jitter, and deviations from the pseudo-random character of data. In addition, the OPM may be configured to perform Fourier transformation based on the autocorrelation points to obtain corresponding spectral components. The spectral components may be used to detect and/or quantify one or more of chromatic dispersion, polarization mode dispersion, and misalignment of a pulse carver and data modulator.Type: ApplicationFiled: March 28, 2002Publication date: November 28, 2002Inventors: Mihaela Dinu, Hernando Garcia, Daniel Kilper, Wayne H. Knox, Howard R. Stuart, Chunhui Xu