Patents by Inventor Dan Sadot
Dan Sadot 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: 20170054510Abstract: An electro-optical FIR transmit filter comprising a segmented MZM including a plurality of MZM segments, for receiving an input optical traveling wave to be filtered; an electrical field driver, for applying a controlled electrical field required for modulation of each MZM using a control signal which controls the electrical field; delay cells associated with at least one MZM, for aligning the control signal with a travelling optical wave; and at least one electrical xT delay cell representing a filter delay, for electrically adjusting the timing of the control signal. The FIR filter's coefficients are implemented in the optical domain by determining the amount of MZM segments driven by each xT delay cell, with respect to the total number of MZM segments.Type: ApplicationFiled: August 16, 2016Publication date: February 23, 2017Applicant: MULTIPHY LTD.Inventors: Anthony Eugene ZORTEA, Dan SADOT, Russell ROMANO
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Publication number: 20170054533Abstract: An optical modulator with a region with non-linear characteristics with optimized BER performance, which comprises circuitry for adjusting the spacing between power levels of optical signals at the output of the optical modulator by adjusting the bias point of the optical modulator to be closer to a nonlinear region of the modulator, such that modulating signals having lower power will be compressed by the nonlinear region more than modulating signals having higher power. During adjustment, larger spacing between higher power levels of optical signals is introduced at the output of the optical modulator and lower spacing between lower power levels of optical signals is introduced at the output of the optical modulator.Type: ApplicationFiled: August 20, 2016Publication date: February 23, 2017Applicant: MULTIPHY LTD.Inventors: Eduard SONKIN, Gilad KATZ, Dan SADOT, Or VIDAL
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Patent number: 9537578Abstract: Method and system for optimally equalizing distortion of an optical data channel carrying coherent optical signals with a given analog bandwidth B. A receiving end with IQ paths receives signals and a balanced detector detects signals in each path. The bandwidth of the detected signals is reduced by a factor of N by filtering the output of each path using an AAF with a cutoff frequency optimized to the analog bandwidth 2B/N of each path, where the AAF has deterministic attributes and introducing Known ISI. The signal is sampled at the AAF output by an ADC, at a sampling rate of 2B/N. The samples of each path are post-processed by a digital processor operating at a data rate of 2B/N, where post-processing represents the compensation of the distortion and the input data stream is reconstructed by optimally decoding the output of the processor using a decoder, which compensates the ISI.Type: GrantFiled: December 13, 2010Date of Patent: January 3, 2017Assignee: Multiphy Ltd.Inventors: Dan Sadot, Gilad Katz, Alik Gorshtein, Omri Levi
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Patent number: 9485121Abstract: System and method for digitally equalizing a data channel having wide channel impulse response for clock recovery of heavily ISI-induced received signals operating at one sample per symbol, according to which the received signal is pre-processed to provide a received signal with modified constellation, which is pre-processed for the decision process of signal with Inter-Symbol Interference by introducing controlled ISI to the received signal. The decision process is performed, based on a higher order vocabulary according to the introduced controlled ISI.Type: GrantFiled: January 26, 2015Date of Patent: November 1, 2016Assignee: Multiphy Ltd.Inventors: Guy Dorman, Dan Sadot, Albert Gorshtein
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Publication number: 20160256063Abstract: This document describes, among other things, a computer-implemented method that includes accessing, by a computer system, electrogram data for a patient, wherein the electrogram data is obtained using one or more leads that sense physiological electrical activity of the patient. The computer system can identify one or more waveform features from the electrogram data, and one or more correlations between values of the one or more waveform features and analyte levels. One or more estimated analyte levels in the patient are determined based on 1) the one or more waveform features identified from the electrogram data and 2) the one or more correlations. The computer system can output information related to the one or more estimated analyte levels.Type: ApplicationFiled: September 26, 2014Publication date: September 8, 2016Applicant: Mayo Foundation for Medical Education and ResearchInventors: Paul A. Friedman, Kevin E. Bennet, Charles J. Bruce, Virend K. Somers, Samuel J. Asirvatham, Michael J. Ackerman, John J. Dillon, Dan Sadot, Yehu Sapir, Amir Geva
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Patent number: 9426000Abstract: System and method for equalizing a high bit rate optical communication channel in a symbol spaced adaptive Multiple-In-Multiple-Out (MIMO) system, where the optical communication channel carries a signal that is sampled at a symbol rate. Accordingly, Anti Aliasing Filtering (which introduces distortions in the form of Deterministic Inter Symbol Interference D-ISI) is applied in a MIMO channel, in order to reduce the aliasing effect associated with symbol rate sampling. The Polarization Mode Dispersions introduced in the optical communication channel are solely compensated by a MIMO Equalizer, which ignores the Deterministic ISI (D-ISI) distortion. Then the Deterministic ISI (D-ISI) distortion is solely compensated by an independent Deterministic Equalizer (DE).Type: GrantFiled: January 2, 2013Date of Patent: August 23, 2016Assignee: Multiply Ltd.Inventors: Albert Gorshtein, Dan Sadot
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Publication number: 20160226577Abstract: A method for estimating the phase of a modulated complex optical signal, according to which, the phase of the signal is isolated and the complex amplitude of the signal is digitized by a block of P samples. An adaptive filter minimizes phase-error between the phase of the received symbol and the phase of a sample, rotated by a phase correction factor, by iteratively performing a Block-Wise Phase LMS estimation on the samples using a step size parameter. During each iteration, the resulting correction factor consists of the sum of the estimated errors multiplied by this parameter, and the correction factor of previous iteration, which is updated, until obtaining the final correction factor from the last iteration. The samples constituting the received signal are recovered by adding the most updated correction factor to the phase of each sample and performing a decision regarding the phase of each sample.Type: ApplicationFiled: December 10, 2013Publication date: August 4, 2016Applicant: Multiphy Ltd.Inventors: Nir Sheffi, Gilad Katz, Albert Gorshtein, Ehud Barzilai, Dan Sadot
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Patent number: 9288045Abstract: A method for providing spectral and temporal stealthy information transmitted over an optical communication channel, according to which, at the transmitting side, the power spectral density of a pulse sequence bearing the information is reduced by encrypting the temporal phase of the pulse sequence. The power of the pulse sequence is spread in the frequency domain, to be below the noise level, by sampling the pulse sequence. Spectral phase encoding is used to temporally spread the pulse sequence and to prevent coherent addition of its spectral replicas in frequency domain. The resulting signal, encrypted both in time and frequency domains, is then transmitted. Spectral phase decoding is performed at the receiving side by performing coherent detection and folding all the spectral replicas of the transmitted signal to the baseband by means of sampling. The temporal phase of the signal is decrypted and the information which is delivered by the pulse sequence is decoded.Type: GrantFiled: July 17, 2012Date of Patent: March 15, 2016Assignees: Ben-Gurion University of the Negev Research and Development Authority, Bar-Ilan UniversityInventors: Dan Sadot, Zeev Zalevsky, Tomer Yeminy
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Publication number: 20150263813Abstract: The present invention is directed to a MIMO equalization system and method, optimized for baud rate clock recovery in coherent symbol-spaced DP-QPSK Metro systems. According to this method, the Mueller & Muller timing function is extended to cope with controlled ISI induced signals, while decoupling between MIMO equalization and clock recovery loops, using a midpoint output of the equalizer for timing estimation, instead of its final output. At least a portion of controlled Inter-Symbol Interference (ISI) is kept intact and the controlled ISI is compensated by an MLSE, right after carrier timing synchronization.Type: ApplicationFiled: March 10, 2015Publication date: September 17, 2015Inventors: Albert GORSHTEIN, Guy DORMAN, Dan SADOT
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Publication number: 20150249557Abstract: A system for digitally equalizing a data channel with heavily ISI-induced signals received after passing a data communication channel using a combination of a linear equalizer and a nonlinear equalizer, which comprises an ADC, for sampling a received signal and converting it to a digital form; a Linear Equalizer for pre-processing said received signal, said Linear Equalizer is adapted to pre-process a first group consisting of echoes/channel taps of the induced ISI, which are not equalized by said nonlinear equalizer, by eliminating the echoes/channel taps of said first group; pre-process a second group consisting of the combination of the entire echoes/channel taps of the induced ISI, by eliminating the echoes/channel taps of said second group; and a nonlinear equalizer for receiving the signals preprocessed by said Linear Equalizer and for further processing said preprocessed signals and eliminating the echoes/channel taps of the induced ISI to be equalized by said nonlinear equalizer, thereby compensatingType: ApplicationFiled: March 2, 2015Publication date: September 3, 2015Inventors: Guy DORMAN, Dan SADOT, Albert GORSHTEIN
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Publication number: 20150215138Abstract: System and method for digitally equalizing a data channel having wide channel impulse response for clock recovery of heavily ISI-induced received signals operating at one sample per symbol, according to which the received signal is pre-processed to provide a received signal with modified constellation, which is pre-processed for the decision process of signal with Inter-Symbol Interference by introducing controlled ISI to the received signal. The decision process is performed, based on a higher order vocabulary according to the introduced controlled ISI.Type: ApplicationFiled: January 26, 2015Publication date: July 30, 2015Inventors: Guy Dorman, Dan Sadot, Albert Gorshtein
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Publication number: 20150093119Abstract: System and method for equalizing a high bit rate optical communication channel in a symbol spaced adaptive Multiple-In-Multiple-Out (MIMO) system, where the optical communication channel carries a signal that is sampled at a symbol rate. Accordingly, Anti Aliasing Filtering (which introduces distortions in the form of Deterministic Inter Symbol Interference D-ISI) is applied in a MIMO channel, in order to reduce the aliasing effect associated with symbol rate sampling. The Polarization Mode Dispersions introduced in the optical communication channel are solely compensated by a MIMO Equalizer, which ignores the Deterministic ISI (D-ISI) distortion. Then the Deterministic ISI (D-ISI) distortion is solely compensated by an independent Deterministic Equalizer (DE).Type: ApplicationFiled: January 2, 2013Publication date: April 2, 2015Inventors: Albert Gorshtein, Dan Sadot
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Publication number: 20150043926Abstract: A method for performing blind channel estimation for an MLSE receiver in a communication channel, according to which Initial Metrics Determination Procedure (IMDP) is performed using joint channel and data estimation in a decision directed mode. This is done by generating a bank of initial metrics that assures convergence, based on initial coarse histograms estimation, representing the channel and selecting a first metrics set M from the predefined bank. Then an iterative decoding procedure is activated during which, a plurality of decision-directed adaptation learning loops are carried out to perform an iterative histograms estimation procedure for finely tuning the channel estimation. Data is decoded during each iteration, based on a previous estimation of the channel during the previous iteration. If convergence is achieved, ISI optimization that maximizes the amount of ISI that is compensated by the MLSE is performed.Type: ApplicationFiled: August 7, 2014Publication date: February 12, 2015Inventors: Omri Levy, Gilad Katz, Albert Gorshtein, Dan Sadot
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Publication number: 20140146969Abstract: A method for providing spectral and temporal stealthy information transmitted over an optical communication channel, according to which, at the transmitting side, the power spectral density of a pulse sequence bearing the information is reduced by encrypting the temporal phase of the pulse sequence. The power of the pulse sequence is spread in the frequency domain, to be below the noise level, by sampling the pulse sequence. Spectral phase encoding is used to temporally spread the pulse sequence and to prevent coherent addition of its spectral replicas in frequency domain. The resulting signal, encrypted both in time and frequency domains, is then transmitted. Spectral phase decoding is performed at the receiving side by performing coherent detection and folding all the spectral replicas of the transmitted signal to the baseband by means of sampling. The temporal phase of the signal is decrypted and the information which is delivered by the pulse sequence is decoded.Type: ApplicationFiled: July 17, 2012Publication date: May 29, 2014Inventors: Dan Sadot, Zeev Zalevsky, Tomer Yeminy
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Publication number: 20130315607Abstract: System and method for compensating distortions introduced by an optical channel and by at least one directly modulated transmitting laser that transmits a modulated optical signal that carries data to a receiving end over the optical channel.Type: ApplicationFiled: November 7, 2011Publication date: November 28, 2013Applicant: BEN-GURION UNIVERSITY OF THE NEGEV, RESEARCH AND DEVELOPMENT AUTHORITYInventors: Dan Sadot, Nir Sheffi
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Patent number: 8483570Abstract: Method for efficiently increasing the capacity of an optical channel which can operate in a given data rate B, by generating N modulated data streams with a bit rate of B/N and a bit-time of N/B at the transmission end, to be simultaneously transmitted from a transmission end to a receiving end of the channel. A shift of 1/B*N between the first modulated data stream and each of its N?1 subsequent modulated data streams is generated using time delay or phase shifting and then the first modulated data stream and its shifted subsequent modulated data streams are combined into a composite multilevel signal with up to N levels and the composite multilevel signal is transmitted to a receiving end of the channel. At the receiving end, the composite multilevel signal is sampled N times during each bit-time, in order to obtain a vector with N elements at each time, such that each element has N+1 possible values and corresponds to the order of a sample.Type: GrantFiled: May 26, 2008Date of Patent: July 9, 2013Assignee: Multipon Networks Ltd.Inventors: Dan Sadot, Gilad Kats
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Publication number: 20120251112Abstract: Method and system for optimally equalizing distortion of an optical data channel carrying coherent optical signals with a given analog bandwidth B. A receiving end with IQ paths receives signals and a balanced detector detects signals in each path. The bandwidth of the detected signals is reduced by a factor of N by filtering the output of each path using an AAF with a cutoff frequency optimized to the analog bandwidth 2B/N of each path, where the AAF has deterministic attributes and introducing Known ISI. The signal is sampled at the AAF output by an ADC, at a sampling rate of 2B/N. The samples of each path are post-processed by a digital processor operating at a data rate of 2B/N, where post-processing represents the compensation of the distortion and the input data stream is reconstructed by optimally decoding the output of the processor using a decoder, which compensates the ISI.Type: ApplicationFiled: December 13, 2010Publication date: October 4, 2012Applicant: MULTIPHY LTD.Inventors: Dan Sadot, Gilad Katz, Alik Gorshtein, Omri Levi
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Publication number: 20100247107Abstract: Method for efficiently increasing the capacity of an optical channel which can operate in a given data rate B, by generating N modulated data streams with a bit rate of B/N and a bit-time of N/B at the transmission end, to be simultaneously transmitted from a transmission end to a receiving end of the channel. A shift of 1/B*N between the first modulated data stream and each of its N?1 subsequent modulated data streams is generated using time delay or phase shifting and then the first modulated data stream and its shifted subsequent modulated data streams are combined into a composite multilevel signal with up to N levels and the composite multilevel signal is transmitted to a receiving end of the channel. At the receiving end, the composite multilevel signal is sampled N times during each bit-time, in order to obtain a vector with N elements at each time, such that each element has N+1 possible values and corresponds to the order of a sample.Type: ApplicationFiled: May 26, 2008Publication date: September 30, 2010Applicant: MULTIPON NETWORKS LTDInventors: Dan Sadot, Gilad Kats
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Publication number: 20090269064Abstract: A new method and system for Optical Code Division Multiple Access (OCDMA) transmission, in which channel selection and rejection are based on dynamic self-heterodyne filtering using differential time delays applied to the data-modulated signals to code and decode the transmissions in each channel. Mach-Zender Interferometers having characteristic delays between their arms are a simple way of performing this coding and decoding. The technique enables the use of narrow linewidth sources and low spectrum spreading. Consequently this technique can be used in next-generation all-optical dynamic networks allowing bandwidth sharing on the one hand, while at the same time eliminating the need for network management and optical switching. Preliminary theoretical calculations predict the system support of up to 15 channels at a data rate of 1 GHz.Type: ApplicationFiled: March 10, 2006Publication date: October 29, 2009Applicant: Ben-Gurion University of the Negev - Research and Development AuthorityInventors: Yehezkel Joseph, Dan Sadot
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Patent number: 7359648Abstract: A method of characterizing a tunable semiconductor laser diode by varying the laser tuning currents of a section, and measuring the output power transmitted by the laser through a wavelength discriminating device (WDD), in such a way that determines the currents needed to optimize the laser output within the passband of the WDD. A preferably employed method is to align the laser to the center of the passband, in order to maximize transmission. Since the laser alignment is performed relative to the spectral response curve of the WDD, there is no need to know the actual wavelength, either of the laser, or of the WDD. The WDD may be a multiplexer, a demultiplexer, an optical filter, or even a complete communications channel. The latter case thus constitutes a method of optimizing the performance of an optical communications channel by optimizing the wavelength of its laser source to the channel.Type: GrantFiled: November 12, 2001Date of Patent: April 15, 2008Assignee: Xlight Photonics Inc.Inventors: Samuel Rubin, Dan Sadot, Efraim Buimovich