Patents by Inventor Peter Andrekson
Peter Andrekson 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: 9325428Abstract: A two-gate sampling system has been designed to perform sampled balanced detection of one or more input signal pairs. The present invention performs simultaneous sampling of both signals in each signal pair followed by digitization and combination of the sample pairs using software. By first sampling the signals and then combining the sampled into the corresponding balanced detected signal it is possible to avoid the bandwidth limitations and impedance problems introduced by traditional balanced detectors and electrical oscilloscopes. In particular, for optical sampling gates very high bandwidth sampling gates can be designed without any impedance issues and hence almost perfect balanced detection reconstruction can be performed for very high speed signals. Balanced detection is becoming more and more important as the new phase modulated optical data signals are introduced to the market, such as e.g. PSK, DPSK, QPSK and DQPSK. The present invention is well suited for analysis of these new types of signals.Type: GrantFiled: September 17, 2009Date of Patent: April 26, 2016Assignee: EXFO INC.Inventors: Mathias Westlund, Peter Andrekson, Henrik Sunnerud, Mats Skold
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Patent number: 8768180Abstract: An optical sampling arrangement for high-speed measurement of the time-varying electric field of an optical input signal utilizes coherent mixing of the optical input signal with a reference laser source in a phase-diverse optical hybrid solution, followed by optical sampling of the coherently-mixed fields at the output of the optical hybrid. The generated streams of optical samples are then detected and signal processed in order to reconstruct a sampled version of the electric field of the original optical input signal.Type: GrantFiled: February 23, 2010Date of Patent: July 1, 2014Assignee: ExFo, Inc.Inventors: Mathias Westlund, Mats Skold, Henrik Sunnerud, Peter Andrekson, Bernard Ruchet
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Publication number: 20130128341Abstract: The invention provides a system for use in an optical communication network to reduce noise comprising means for tapping a low noise signal from said network and a phase sensitive amplifier (PSA) for conditioning said tapped signal by means for removing modulation of the tapped signal to allow for phase locking of the tapped signal. A laser source provides phase locked reference signals to generate at least one pump signal, wherein the at least one pump signal provides correct phase alignment for optimum PSA operation. The invention makes use of injection locked and/or phase locked laser sources in conjunction with low power input tap couplers, or post/mid amplification taps to provide the required phase locked reference signals without degrading the input loss or noise. The use of injection/phase locked local lasers suppresses the detrimental impact of the low tapped power or added noise in the generation of the required pump signals.Type: ApplicationFiled: December 3, 2010Publication date: May 23, 2013Applicants: CHALMERS UNIVERSITY OF TECHNOLOGY, University College Cork, National University of Ireland, UNIVERSITY OF SOUTHAMPTON, NATIONAL AND KAPODESTRIAN UNIVERSITY OF ATHENSInventors: Andrew Ellis, Stylianos Sygletos, Peter Andrekson, Antonio Bogris, David Richardson, Dimitris Syvridis
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Patent number: 8280245Abstract: An optical sampling arrangement for high-speed measurement of the time-varying electric field of a data-carrying optical input signal. The present invention includes optical sampling of the optical input signal, followed by coherent mixing with a reference laser source in an optical hybrid solution. The generated streams of mixed optical samples are then detected and signal processed in order to reconstruct a sampled version of the electric field of the data-carrying optical input signal.Type: GrantFiled: February 23, 2010Date of Patent: October 2, 2012Assignee: EXFO. Inc.Inventors: Mathias Westlund, Mats Sköld, Henrik Sunnerud, Peter A. Andrekson
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Publication number: 20120134667Abstract: An optical sampling arrangement for high-speed measurement of the time-varying electric field of an optical input signal utilizes coherent mixing of the optical input signal with a reference laser source in a phase-diverse optical hybrid solution, followed by optical sampling of the coherently-mixed fields at the output of the optical hybrid. The generated streams of optical samples are then detected and signal processed in order to reconstruct a sampled version of the electric field of the original optical input signal.Type: ApplicationFiled: February 23, 2010Publication date: May 31, 2012Applicant: EXFO INC.Inventors: Mathias Westlund, Mats Skold, Henrik Sunnerud, Peter Andrekson, Bernard Ruchet
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Publication number: 20110182573Abstract: A two-gate sampling system has been designed to perform sampled balanced detection of one or more input signal pairs. The present invention performs simultaneous sampling of both signals in each signal pair followed by digitization and combination of the sample pairs using software. By first sampling the signals and then combining the sampled into the corresponding balanced detected signal it is possible to avoid the bandwidth limitations and impedance problems introduced by traditional balanced detectors and electrical oscilloscopes. In particular, for optical sampling gates very high bandwidth sampling gates can be designed without any impedance issues and hence almost perfect balanced detection reconstruction can be performed for very high speed signals. Balanced detection is becoming more and more important as the new phase modulated optical data signals are introduced to the market, such as e.g. PSK, DPSK, QPSK and DQPSK. The present invention is well suited for analysis of these new types of signals.Type: ApplicationFiled: September 17, 2009Publication date: July 28, 2011Applicant: EXFO INC.Inventors: Mathias Westlund, Peter Andrekson, Henrik Sunnerud, Mats Skold
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Publication number: 20100215357Abstract: An optical sampling arrangement for high-speed measurement of the time-varying electric field of a data-carrying optical input signal. The present invention includes optical sampling of the optical input signal, followed by coherent mixing with a reference laser source in an optical hybrid solution. The generated streams of mixed optical samples are then detected and signal processed in order to reconstruct a sampled version of the electric field of the data-carrying optical input signal.Type: ApplicationFiled: February 23, 2010Publication date: August 26, 2010Inventors: Mathias Westlund, Mats Sköld, Henrik Sunnerud, Peter A. Andrekson
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Publication number: 20100067607Abstract: A two gate sampling system designed to perform sampled balanced detection of one or more input signal pairs. The present invention performs simultaneous sampling of both signals in each signal pair followed by digitization and combination of the sample pairs using software. By first sampling the signals and then combine the sampled into the corresponding balanced detected signal it is possible to avoid the bandwidth limitations and impedance problems introduced by traditional balanced detectors and electrical oscilloscopes. In particular for optical sampling gates very high bandwidth sampling gates can be designed without any impedance issues and hence almost perfect balanced detection reconstruction can be performed for very high speed signals. Balanced detection is becoming more and more important as the new phase modulated optical data signals are introduced to the market, such as e.g. PSK, DPSK, QPSK and DQPSK. The present invention is well suited for analysis of these new type of signals.Type: ApplicationFiled: September 18, 2008Publication date: March 18, 2010Inventors: Mathias Westlund, Peter Andrekson, Henrik Sunnerud, Mats Skold
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Patent number: 7327302Abstract: An asynchronous sampling arrangement utilizes sampling of both a high speed data signal and a trigger (clock) signal. The data signal may be either an optical signal or an electrical signal. The data and trigger signals are sampled in parallel by two separate gates, the gates based on the same strobe frequency. The samples corresponding to the trigger signal are then processed through an algorithm that determines the time-base related to the sampled signal. This established time-base is then used to reconstruct the sampled version of the high data rate input signal waveform.Type: GrantFiled: February 10, 2006Date of Patent: February 5, 2008Assignee: PicoSolve Inc.Inventors: Mathias Westlund, Peter Andrekson
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Publication number: 20070188363Abstract: An asynchronous sampling arrangement utilizes sampling of both a high speed data signal and a trigger (clock) signal. The data signal may be either an optical signal or an electrical signal. The data and trigger signals are sampled in parallel by two separate gates, the gates based on the same strobe frequency. The samples corresponding to the trigger signal are then processed through an algorithm that determines the time-base related to the sampled signal. This established time-base is then used to reconstruct the sampled version of the high data rate input signal waveform.Type: ApplicationFiled: February 10, 2006Publication date: August 16, 2007Inventors: Mathias Westlund, Peter Andrekson
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Patent number: 7199870Abstract: A system and method for providing polarization-independent optical sampling utilizes a differential group delay (DGD) element to split a sampling pulse source (SPS) into orthogonal components by controlling the state of polarization of the SPS at the DGD element input. The orthogonally-polarized sampling pulse components then each interact with the input optical signal waveform in a polarization-dependent sampling gate, creating two samples for each original sampling pulse. The generated samples are converted into the electrical domain by a photodetector with an impulse response time longer than that associated with the DGD element, resulting in a single impulse response representing the combined energy of the two samples that is independent of the state of polarization of the input optical signal waveform.Type: GrantFiled: February 10, 2005Date of Patent: April 3, 2007Assignee: PicoSolve Inc.Inventors: Peter Andrekson, Bengt-Erik Olsson, Mathias Westlund
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Publication number: 20060176472Abstract: A system and method for providing polarization-independent optical sampling utilizes a differential group delay (DGD) element to split a sampling pulse source (SPS) into orthogonal components by controlling the state of polarization of the SPS at the DGD element input. The orthogonally-polarized sampling pulse components then each interact with the input optical signal waveform in a polarization-dependent sampling gate, creating two samples for each original sampling pulse. The generated samples are converted into the electrical domain by a photodetector with an impulse response time longer than that associated with the DGD element, resulting in a single impulse response representing the combined energy of the two samples that is independent of the state of polarization of the input optical signal waveform.Type: ApplicationFiled: February 10, 2005Publication date: August 10, 2006Applicant: PicoSolve Inc.Inventors: Peter Andrekson, Bengt-Erik Olsson, Mathias Westlund
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Publication number: 20030133652Abstract: A method and apparatus for improving the performance in OSNR-limited systems includes selective pre-chirping of a transmitted optical signal, such that, in combination with the link dispersion, a net pulse compression is obtained at the receive end of an optical link.Type: ApplicationFiled: November 25, 2002Publication date: July 17, 2003Inventors: Peter A. Andrekson, Jonas Hansryd