Patents by Inventor Leo Strawczynski
Leo Strawczynski 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: 10574352Abstract: Generation of data streams for two dimensions comprises compensation for a nonideal response of a signal path in an optical communications signal. The data streams are converted to analog electrical signals which drive two dimensions of an electrical-to-optical converter. Output of the electrical-to-optical converter is coupled through an optical link to an optical-to-electrical converter.Type: GrantFiled: November 23, 2018Date of Patent: February 25, 2020Assignee: Ciena CorporationInventors: Kim B. Roberts, Maurice O'Sullivan, Leo Strawczynski, Kieran Parsons, John McNicol
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Patent number: 10404515Abstract: An adaptable orthogonal frequency-division multiplexing system (OFDM) that uses a multiple input multiple output (MIMO) to having OFDM signals transmitted either in accordance with time diversity to reducing signal fading or in accordance with spatial diversity to increase the data rate. Sub-carriers are classified for spatial diversity transmission or for time diversity transmission based on the result of a comparison between threshold values and at least one of three criteria. The criteria includes a calculation of a smallest eigen value of a frequency channel response matrix and a smallest element of a diagonal of the matrix and a ratio of the largest and smallest eigen values of the matrix.Type: GrantFiled: October 2, 2017Date of Patent: September 3, 2019Assignee: Apple Inc.Inventors: Shiquan Wu, Wen Tong, Leo Strawczynski
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Publication number: 20190109639Abstract: Generation of data streams for two dimensions comprises compensation for a nonideal response of a signal path in an optical communications signal. The data streams are converted to analog electrical signals which drive two dimensions of an electrical-to-optical converter. Output of the electrical-to-optical converter is coupled through an optical link to an optical-to-electrical converter.Type: ApplicationFiled: November 23, 2018Publication date: April 11, 2019Inventors: Kim B. ROBERTS, Maurice O'SULLIVAN, Leo STRAWCZYNSKI, Kieran PARSONS, John McNICOL
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Patent number: 10164707Abstract: A compensation function mitigates a substantial portion of the dispersion imparted to a communications signal by an optical communications system. A digital input signal is digitally processed using the compensation function to generate a predistorted signal. An amplitude and a phase of an optical signal are modulated using a pair of orthogonal signal components to generate a predistorted optical signal for transmission. In one implementation, the pair of orthogonal signal components are components of the predistorted signal. In another implementation, the predistorted signal is processed using a non-linear compensator to generate a further distorted signal and the pair of orthogonal signal components are components of the further distorted signal. In that implementation, the non-linear compensator is configured to substantially compensate for nonlinearities in one or both of an optical modulator of a transmitter of the system and an optical-to-electrical converter of a receiver of the system.Type: GrantFiled: November 27, 2017Date of Patent: December 25, 2018Assignee: Ciena CorporationInventors: Kim B. Roberts, Maurice O'Sullivan, John McNicol, Kieran Parsons, Leo Strawczynski
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Publication number: 20180076887Abstract: A compensation function mitigates a substantial portion of the dispersion imparted to a communications signal by an optical communications system. A digital input signal is digitally processed using the compensation function to generate a predistorted signal. An amplitude and a phase of an optical signal are modulated using a pair of orthogonal signal components to generate a predistorted optical signal for transmission. In one implementation, the pair of orthogonal signal components are components of the predistorted signal. In another implementation, the predistorted signal is processed using a non-linear compensator to generate a further distorted signal and the pair of orthogonal signal components are components of the further distorted signal. In that implementation, the non-linear compensator is configured to substantially compensate for nonlinearities in one or both of an optical modulator of a transmitter of the system and an optical-to-electrical converter of a receiver of the system.Type: ApplicationFiled: November 27, 2017Publication date: March 15, 2018Inventors: Kim B. ROBERTS, Maurice O'SULLIVAN, John McNICOL, Kieran PARSONS, Leo STRAWCZYNSKI
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Publication number: 20180026824Abstract: An adaptable orthogonal frequency-division multiplexing system (OFDM) that uses a multiple input multiple output (MIMO) to having OFDM signals transmitted either in accordance with time diversity to reducing signal fading or in accordance with spatial diversity to increase the data rate. Sub-carriers are classified for spatial diversity transmission or for time diversity transmission based on the result of a comparison between threshold values and at least one of three criteria. The criteria includes a calculation of a smallest eigen value of a frequency channel response matrix and a smallest element of a diagonal of the matrix and a ratio of the largest and smallest eigen values of the matrix.Type: ApplicationFiled: October 2, 2017Publication date: January 25, 2018Inventors: Shiquan WU, Wen TONG, Leo STRAWCZYNSKI
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Patent number: 9853725Abstract: A compensation function mitigates a substantial portion of the chromatic dispersion imparted to a communications signal by an optical communications system. A digital input signal is digitally processed using the compensation function to generate a predistorted signal. An amplitude and a phase of an optical signal are modulated using a pair of orthogonal signal components to generate a predistorted optical signal for transmission. In one implementation, the pair of orthogonal signal components are components of the predistorted signal. In another implementation, the predistorted signal is processed using a non-linear compensator to generate a further distorted signal and the pair of orthogonal signal components are components of the further distorted signal. In that implementation, the non-linear compensator is configured to substantially compensate for nonlinearities in one or both of an optical modulator of a transmitter of the system and an optical-to-electrical converter of a receiver of the system.Type: GrantFiled: November 29, 2016Date of Patent: December 26, 2017Assignee: Ciena CorporationInventors: Kim B. Roberts, Maurice O'Sullivan, John McNicol, Kieran Parsons, Leo Strawczynski
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Patent number: 9780987Abstract: An adaptable orthogonal frequency-division multiplexing system (OFDM) that uses a multiple input multiple output (MIMO) to having OFDM signals transmitted either in accordance with time diversity to reducing signal fading or in accordance with spatial diversity to increase the data rate. Sub-carriers are classified for spatial diversity transmission or for time diversity transmission based on the result of a comparison between threshold values and at least one of three criteria. The criteria includes a calculation of a smallest eigen value of a frequency channel response matrix and a smallest element of a diagonal of the matrix and a ratio of the largest and smallest eigen values of the matrix.Type: GrantFiled: May 16, 2016Date of Patent: October 3, 2017Assignee: APPLE INC.Inventors: Shiquan Wu, Wen Tong, Leo Strawczynski
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Publication number: 20170078016Abstract: A compensation function mitigates a substantial portion of the chromatic dispersion imparted to a communications signal by an optical communications system. A digital input signal is digitally processed using the compensation function to generate a predistorted signal. An amplitude and a phase of an optical signal are modulated using a pair of orthogonal signal components to generate a predistorted optical signal for transmission. In one implementation, the pair of orthogonal signal components are components of the predistorted signal. In another implementation, the predistorted signal is processed using a non-linear compensator to generate a further distorted signal and the pair of orthogonal signal components are components of the further distorted signal. In that implementation, the non-linear compensator is configured to substantially compensate for nonlinearities in one or both of an optical modulator of a transmitter of the system and an optical-to-electrical converter of a receiver of the system.Type: ApplicationFiled: November 29, 2016Publication date: March 16, 2017Inventors: Kim B. ROBERTS, Maurice O'SULLIVAN, John McNICOL, Kieran PARSONS, Leo STRAWCZYNSKI
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Patent number: 9559778Abstract: Optical dispersion imposed on a communications signal conveyed through an optical communications system is compensated by modulating the communications signal in the electrical domain. A compensation function is determined that substantially mitigates the chromatic dispersion. The communications signal is then modulated in the electrical domain using the compensation function. In preferred embodiments, compensation is implemented in the transmitter, using a look-up-table and digital-to-analog converter to generate an electrical predistorted signal. The electrical predistorted signal is then used to modulate an optical source to generate a corresponding predistorted optical signal for transmission through the optical communications system.Type: GrantFiled: July 11, 2003Date of Patent: January 31, 2017Assignee: CIENA CORPORATIONInventors: John McNicol, Kieran Parsons, Leo Strawczynski, Kim B. Roberts, Maurice S. O'Sullivan
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Publication number: 20160261450Abstract: An adaptable orthogonal frequency-division multiplexing system (OFDM) that uses a multiple input multiple output (MIMO) to having OFDM signals transmitted either in accordance with time diversity to reducing signal fading or in accordance with spatial diversity to increase the data rate. Sub-carriers are classified for spatial diversity transmission or for time diversity transmission based on the result of a comparison between threshold values and at least one of three criteria. The criteria includes a calculation of a smallest eigen value of a frequency channel response matrix and a smallest element of a diagonal of the matrix and a ratio of the largest and smallest eigen values of the matrix.Type: ApplicationFiled: May 16, 2016Publication date: September 8, 2016Inventors: Shiquan WU, Wen TONG, Leo STRAWCZYNSKI
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Patent number: 9344316Abstract: An adaptable orthogonal frequency-division multiplexing system (OFDM) that uses a multiple input multiple output (MIMO) to having OFDM signals transmitted either in accordance with time diversity to reducing signal fading or in accordance with spatial diversity to increase the data rate. Sub-carriers are classified for spatial diversity transmission or for time diversity transmission based on the result of a comparison between threshold values and at least one of three criteria. The criteria includes a calculation of a smallest eigen value of a frequency channel response matrix and a smallest element of a diagonal of the matrix and a ratio of the largest and smallest eigen values of the matrix.Type: GrantFiled: September 10, 2014Date of Patent: May 17, 2016Assignee: APPLE INC.Inventors: Shiquan Wu, Wen Tong, Leo Strawczynski
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Publication number: 20140376601Abstract: An adaptable orthogonal frequency-division multiplexing system (OFDM) that uses a multiple input multiple output (MIMO) to having OFDM signals transmitted either in accordance with time diversity to reducing signal fading or in accordance with spatial diversity to increase the data rate. Sub-carriers are classified for spatial diversity transmission or for time diversity transmission based on the result of a comparison between threshold values and at least one of three criteria. The criteria includes a calculation of a smallest eigen value of a frequency channel response matrix and a smallest element of a diagonal of the matrix and a ratio of the largest and smallest eigen values of the matrix.Type: ApplicationFiled: September 10, 2014Publication date: December 25, 2014Inventors: Shiquan WU, Wen TONG, Leo STRAWCZYNSKI
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Patent number: 8837272Abstract: An adaptable orthogonal frequency-division multiplexing system (OFDM) that uses a multiple input multiple output (MIMO) to having OFDM signals transmitted either in accordance with time diversity to reducing signal fading or in accordance with spatial diversity to increase the data rate. Sub-carriers are classified for spatial diversity transmission or for time diversity transmission based on the result of a comparison between threshold values and at least one of three criteria. The criteria includes a calculation of a smallest eigen value of a frequency channel response matrix and a smallest element of a diagonal of the matrix and a ratio of the largest and smallest eigen values of the matrix.Type: GrantFiled: November 16, 2012Date of Patent: September 16, 2014Assignee: Apple Inc.Inventors: Shiquan Wu, Wen Tong, Leo Strawczynski
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Patent number: 8339935Abstract: An adaptable orthogonal frequency-division multiplexing system (OFDM) that uses a multiple input multiple output (MIMO) to having OFDM signals transmitted either in accordance with time diversity to reducing signal fading or in accordance with spatial diversity to increase the data rate. Sub-carriers are classified for spatial diversity transmission or for time diversity transmission based on the result of a comparison between threshold values and at least one of three criteria. The criteria includes a calculation of a smallest eigen value of a frequency channel response matrix and a smallest element of a diagonal of the matrix and a ratio of the largest and smallest eigen values of the matrix.Type: GrantFiled: December 2, 2011Date of Patent: December 25, 2012Assignee: Apple Inc.Inventors: Shiquan Wu, Wen Tong, Leo Strawczynski
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Publication number: 20120076228Abstract: An adaptable orthogonal frequency-division multiplexing system (OFDM) that uses a multiple input multiple output (MIMO) to having OFDM signals transmitted either in accordance with time diversity to reducing signal fading or in accordance with spatial diversity to increase the data rate. Sub-carriers are classified for spatial diversity transmission or for time diversity transmission based on the result of a comparison between threshold values and at least one of three criteria. The criteria includes a calculation of a smallest eigen value of a frequency channel response matrix and a smallest element of a diagonal of the matrix and a ratio of the largest and smallest eigen values of the matrix.Type: ApplicationFiled: December 2, 2011Publication date: March 29, 2012Applicant: Nortel Networks LimitedInventors: Shiquan Wu, Wen Tong, Leo Strawczynski
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Patent number: 8077599Abstract: An adaptable orthogonal frequency-division multiplexing system (OFDM) that uses a multiple input multiple output (MIMO) to having OFDM signals transmitted either in accordance with time diversity to reducing signal fading or in accordance with spatial diversity to increase the data rate. Sub-carriers are classified for spatial diversity transmission or for time diversity transmission based on the result of a comparison between threshold values and at least one of three criteria. The criteria includes a calculation of a smallest eigen value of a frequency channel response matrix and a smallest element of a diagonal of the matrix and a ratio of the largest and smallest eigen values of the matrix.Type: GrantFiled: August 13, 2010Date of Patent: December 13, 2011Assignee: Nortel Networks LimitedInventors: Shiquan Wu, Wen Tong, Leo Strawczynski
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Publication number: 20110044394Abstract: An adaptable orthogonal frequency-division multiplexing system (OFDM) that uses a multiple input multiple output (MIMO) to having OFDM signals transmitted either in accordance with time diversity to reducing signal fading or in accordance with spatial diversity to increase the data rate. Sub-carriers are classified for spatial diversity transmission or for time diversity transmission based on the result of a comparison between threshold values and at least one of three criteria. The criteria includes a calculation of a smallest eigen value of a frequency channel response matrix and a smallest element of a diagonal of the matrix and a ratio of the largest and smallest eigen values of the matrix.Type: ApplicationFiled: August 13, 2010Publication date: February 24, 2011Applicant: Nortel Networks LimitedInventors: Shiquan Wu, Wen Tong, Leo Strawczynski
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Patent number: 7894721Abstract: An optical network system having a global controller capable of controlling all the elements of the network. The controller receives performance data from each optical network element and calculates a performance value for each channel transmitting through the system. The controller then isolates the channel with the minimum performance value and tests possible changes in network element parameters to find a change which would increase this performance value. Once such a change is found, it is implemented and the system is reoptimized.Type: GrantFiled: September 19, 2006Date of Patent: February 22, 2011Assignee: Ciena CorporationInventors: Kim B. Roberts, Genzao G. Zhang, James Harley, Feng Shi, Leo Strawczynski
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Patent number: 7894724Abstract: A method and system for averaging the effects of polarization distortions across a multitude of transmitted data streams in a dual polarization multiplexed optical communications system. Data streams are interleaved amongst each other in accordance with a predetermined pattern. The interleaved data streams are symbol mapped and modulated to provide a pair of optical signals. The pair of optical signals are orthogonally polarized, and multiplexed for transmission across an optical fiber. A receiver circuit receives the transmitted signal and extracts the interleaved data streams. The interleaved data streams are de-interleaved to generate the original data streams. While the data streams can be interleaved and transmitted via a single wavelength optical signal, the data streams can be interleaved and transmitted over two or more different wavelength optical signals to further mitigate the effects of polarization distortions.Type: GrantFiled: March 31, 2005Date of Patent: February 22, 2011Assignee: Ciena CorporationInventors: Chandra Bontu, Leo Strawczynski