Patents by Inventor Enrico Forestieri
Enrico Forestieri 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: 11677475Abstract: A method (100) of encoding communications traffic bits onto an optical carrier signal in a pulse amplitude modulation, PAM, format. The method comprises: receiving (102) bits to be transmitted; receiving (104) an optical carrier signal comprising optical pulses having an amplitude and respective phases; performing (106) PAM of the optical pulses to encode at least one respective bit in one of a pre-set plurality of amplitudes of a said optical pulse; and performing (108) phase modulation of the optical pulses to encode at least one further respective bit in a phase difference between a said optical pulse and a consecutive optical pulse.Type: GrantFiled: March 12, 2020Date of Patent: June 13, 2023Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Tommaso Catuogno, Enrico Forestieri, Luca Poti, Francesco Fresi, Fabio Cavaliere, Marco Secondini
-
Publication number: 20220182150Abstract: A method (100) of encoding communications traffic bits onto an optical carrier signal in a pulse amplitude modulation, PAM, format. The method comprises: receiving (102) bits to be transmitted; receiving (104) an optical carrier signal comprising optical pulses having an amplitude and respective phases; performing (106) PAM of the optical pulses to encode at least one respective bit in one of a pre-set plurality of amplitudes of a said optical pulse; and performing (108) phase modulation of the optical pulses to encode at least one further respective bit in a phase difference between a said optical pulse and a consecutive optical pulse.Type: ApplicationFiled: March 12, 2020Publication date: June 9, 2022Inventors: Tommaso Catuogno, Enrico Forestieri, Luca Poti, Francesco Fresi, Fabio Cavaliere, Marco Secondini
-
Patent number: 10895797Abstract: Digital data (11) is encoded to a set of five line symbols for optical transmission. The line symbols have amplitude values of 0, ±A1, ±A2, where |A2|>|A1|. A first binary value maps to the line symbols 0 and ±A2 and a second binary value maps to the line symbols ±A1. The amplitude values of the line symbols can be in the ratio A1:A2=1:sqrt(2). At a receiver, the received signal is photodetected to generate an electrical signal which can represent a set of three possible received symbols (RS1, RS2, RS3). Digital data (26) is recovered from the received symbols by comparing the electrical signal with a first amplitude threshold (TH1) and a second amplitude threshold (TH2).Type: GrantFiled: May 25, 2016Date of Patent: January 19, 2021Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Fabio Cavaliere, Enrico Forestieri
-
Patent number: 10763970Abstract: A first signal is generated from an input signal by a first delay (70), and by low pass filtering (74). A second signal is generated from the input signal and from a second, longer delayed (72), version of the input signal, such that in response to a pulse on the input signal, the second signal has a sequence of two pulses, coinciding respectively with leading and trailing edges of a corresponding pulse on the first signal. If the signals are electrical, they can drive I and Q inputs of an IQ modulator (84, 86). If generated optically, they can be combined directly to produce the encoded optical output signal. By using such delays and filtering to produce these signals, a CAPS-3 encoded optical signal can be simulated, to obtain its chromatic dispersion tolerance advantages with less complex hardware and less power consumption.Type: GrantFiled: August 10, 2016Date of Patent: September 1, 2020Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Fabio Cavaliere, Enrico Forestieri
-
Publication number: 20200195352Abstract: A first signal is generated from an input signal by a first delay (70), and by low pass filtering (74). A second signal is generated from the input signal and from a second, longer delayed (72), version of the input signal, such that in response to a pulse on the input signal, the second signal has a sequence of two pulses, coinciding respectively with leading and trailing edges of a corresponding pulse on the first signal. If the signals are electrical, they can drive I and Q inputs of an IQ modulator (84, 86). If generated optically, they can be combined directly to produce the encoded optical output signal. By using such delays and filtering to produce these signals, a CAPS-3 encoded optical signal can be simulated, to obtain its chromatic dispersion tolerance advantages with less complex hardware C and less power consumption.Type: ApplicationFiled: August 10, 2016Publication date: June 18, 2020Inventors: Fabio CAVALIERE, Enrico FORESTIERI
-
Patent number: 10432316Abstract: A method of transmitting communications traffic, the method comprising steps of receiving a sequence of communications traffic bits; and mapping the sequence of communications traffic bits onto a respective one of a plurality of transmission symbols for transmission during a symbol time. Each transmission symbol is identified by a respective first symbol identifier indicative of a respective one or more of a plurality, M, of wavelengths for a transmission signal and a respective second symbol identifier indicative of a respective one or more of a plurality, N, of optical fibers on which to transmit the transmission signal.Type: GrantFiled: September 8, 2015Date of Patent: October 1, 2019Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Fabio Cavaliere, Antonio Malacarne, Enrico Forestieri, Marco Secondini, Luca Poti
-
Publication number: 20180254833Abstract: A method of transmitting communications traffic, the method comprising steps of receiving a sequence of communications traffic bits; and mapping the sequence of communications traffic bits onto a respective one of a plurality of transmission symbols for transmission during a symbol time. Each transmission symbol is identified by a respective first symbol identifier indicative of a respective one or more of a plurality, M, of wavelengths for a transmission signal and a respective second symbol identifier indicative of a respective one or more of a plurality, N, of optical fibres on which to transmit the transmission signal.Type: ApplicationFiled: September 8, 2015Publication date: September 6, 2018Inventors: Fabio CAVALIERE, Antonio MALACARNE, Enrico FORESTIERI, Marco SECONDINI, Luca POTI
-
Patent number: 9941963Abstract: A method (10) of non-linear propagation impairment equalization, the method comprising the steps of: a. receiving (12) communications traffic carried by an optical communications signal transmitted over an optical communications link; b. generating (14) a time dependent filter representation of a nonlinear time-variant impulse response of the inverse of the optical communications link; and c. applying (16) the time dependent filter representation to the received communications traffic to form non-linear propagation impairment equalized communications traffic. An optical communications link nonlinear propagation impairment equalizer and optical communications signal receiver apparatus are also provided.Type: GrantFiled: May 12, 2014Date of Patent: April 10, 2018Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Roberto Magri, Enrico Forestieri, Marco Secondini, Domenico Marsella
-
Publication number: 20170078023Abstract: A method (10) of non-linear propagation impairment equalisation, the method comprising the steps of: a. receiving (12) communications traffic carried by an optical communications signal transmitted over an optical communications link; b. generating (14) a time dependent filter representation of a nonlinear time-variant impulse response of the inverse of the optical communications link; and c. applying (16) the time dependent filter representation to the received communications traffic to form non-linear propagation impairment equalised communications traffic. An optical communications link nonlinear propagation impairment equaliser and optical communications signal receiver apparatus are also provided.Type: ApplicationFiled: May 12, 2014Publication date: March 16, 2017Inventors: Roberto MAGRI, Enrico FORESTIERI, Marco SECONDINI, Domenico MARSELLA
-
Patent number: 9432128Abstract: A method of detecting a signal in an optical receiver is described. The method includes converting a received optical signal to a digital electrical signal comprising a plurality of samples, applying a predetermined phase rotation to said samples to obtain amplitude and phase components of phase range adjusted sample values, and performing a first detection process based on the amplitude and phase components of the phase range adjusted sample values.Type: GrantFiled: July 25, 2012Date of Patent: August 30, 2016Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Domenico Marsella, Marco Secondini, Roberto Magri, Enrico Forestieri
-
Patent number: 9166703Abstract: An equalizer (60) processes, in the electrical domain, a signal obtained from a path of an optical transmission system. The equalizer comprises N cascaded stages (where N?1). At least one of the stages comprises a cascade of a linear equalization element (61) and a non-linear equalization element (62). The equalizer (60) is able to compensate for both linear impairments, such as dispersion, and non-linear impairments. The cascaded linear and non-linear elements can simulate the effect of signal propagation through a fiber which has the opposite propagation parameters (e.g. attenuation, dispersion, non-linearity) to those of the propagation path experienced by a signal in the transmission system. The non-linear equalization element (62) can be a non-linear phase rotator which rotates phase of an input signal proportional to the squared modulus of the input signal amplitude.Type: GrantFiled: February 20, 2009Date of Patent: October 20, 2015Assignee: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)Inventors: Marco Secondini, Enrico Forestieri
-
Publication number: 20150180588Abstract: A method of detecting a signal in an optical receiver is described. The method includes converting a received optical signal to a digital electrical signal comprising a plurality of samples, applying a predetermined phase rotation to said samples to obtain amplitude and phase components of phase range adjusted sample values, and performing a first detection process based on the amplitude and phase components of the phase range adjusted sample values.Type: ApplicationFiled: July 25, 2012Publication date: June 25, 2015Applicant: Telefonaktiebolaget L M Ericsson (publ)Inventors: Domenico Marsella, Marco Secondini, Roberto Magri, Enrico Forestieri
-
Patent number: 8611763Abstract: A method (10) of compensating phase noise in a coherent optical communications network. The method comprises: receiving a traffic sample (12); receiving an optical carrier and determining a phase noise estimate for the optical carrier (14); and removing the phase noise estimate from the traffic sample to form a phase noise compensated traffic sample (16).Type: GrantFiled: September 2, 2010Date of Patent: December 17, 2013Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Marco Secondini, Tommaso Foggi, Giulio Colavolpe, Gianluca Meloni, Luca Poti, Enrico Forestieri
-
Patent number: 8218978Abstract: A method of and a receiver(20) for detection of a received signal in an optical fiber communication system using Viterbi algorithm methodology in which branch metrics are obtained using approximated expressions to calculate the branch metrics. Use of the expressions results in practically the same performance as a receiver based on exact metrics.Type: GrantFiled: November 30, 2006Date of Patent: July 10, 2012Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Tommaso Foggi, Giulio Colavolpe, Enrico Forestieri, Giancarlo Prati
-
Publication number: 20120027404Abstract: A method (10) of compensating phase noise in a coherent optical communications network. The method comprises: receiving a traffic sample (12); receiving an optical carrier and determining a phase noise estimate for the optical carrier (14); and removing the phase noise estimate from the traffic sample to form a phase noise compensated traffic sample (16).Type: ApplicationFiled: September 2, 2010Publication date: February 2, 2012Applicant: Telefonaktiebolaget L M Ericsson (publ)Inventors: Marco Secondini, Tommaso Foggi, Giulio Colavolpe, Gianluca Meloni, Luca Poti, Enrico Forestieri
-
Publication number: 20120027418Abstract: An equaliser (60) processes, in the electrical domain, a signal obtained from a path of an optical transmission system. The equaliser comprises N cascaded stages (where N?1). At least one of the stages comprises a cascade of a linear equalisation element (61) and a non-linear equalisation element (62). The equaliser (60) is able to compensate for both linear impairments, such as dispersion, and non-linear impairments. The cascaded linear and non-linear elements can simulate the effect of signal propagation through a fibre which has the opposite propagation parameters (e.g. attenuation, dispersion, non-linearity) to those of the propagation path experienced by a signal in the transmission system. The non-linear equalisation element (62) can be a non-linear phase rotator which rotates phase of an input signal proportional to the squared modulus of the input signal amplitude.Type: ApplicationFiled: February 20, 2009Publication date: February 2, 2012Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Marco Secondini, Enrico Forestieri
-
Patent number: 7873282Abstract: A polarization multiplex transmission system (10) comprises two optical signals (z1, z2) transmitted over the same optical fiber (15) at the same wavelength but with orthogonal polarizations. The system is characterized by receiving apparatus (10) which is operable to filter the two components with orthogonal polarization of the signal received in accordance with an appropriate transfer matrix which is dynamically controlled on the basis of the output signals in such a manner as to approximate the reverse transfer matrix of the fiber in the region of the spectrum occupied by the signal so as to compensate for Polarization Mode Dispersion (PMD) and polarization rotation introduced by the fiber and eliminating distortion and mutual interference effects for both the signals and thereby obtain a demultiplexed output corresponding to the two transmitted signals.Type: GrantFiled: March 9, 2005Date of Patent: January 18, 2011Assignee: Ericsson ABInventors: Marco Secondini, Enrico Forestieri, Giancarlo Prati, Giulio Colavolpe
-
Publication number: 20100061738Abstract: A signal processor for compensating for optical fibre chromatic dispersion comprising encoding means (5) for encoding a source signal (2) received from a data source (6), splitting means (8) to separate the encoded signal (7) from the encoding means (5) into an in-phase component (10) and an in-quadrature component (11), a first filter means (12) adapted to receive the in-phase component (10) and a second filter means (13) adapted to receive the in-quadrature component (11), the first filter means (12) and second filter means (13) being adapted to filter the in-phase and in-quadrature components respectively. The outputs (14, 15) from the filter means form the input to the optical modulator means (3).Type: ApplicationFiled: December 23, 2006Publication date: March 11, 2010Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Luca Giorgi, Ernesto Ciaramella, Fabio Cavaliere, Enrico Forestieri, Wladek Forysiak
-
Publication number: 20090317094Abstract: A method of and a receiver(20) for detection of a received signal in an optical fibre communication system using Viterbi algorithm methodology in which branch metrics are obtained using approximated expressions to calculate the branch metrics. Use of the expressions results in practically the same performance as a receiver based on exact metrics.Type: ApplicationFiled: November 30, 2006Publication date: December 24, 2009Inventors: Tommaso Foggi, Giulio Colavolpe, Enrico Forestieri, Giancarlo Prati
-
Patent number: 7444082Abstract: A method for the adaptive adjustment of a PMD compensator in optical fiber communication systems comprises the steps of taking the signal at the compensator output and extracting the components y1(t) and y2(t) on the two orthogonal polarizations, computing the signal y(t)=[y1(t)]2+[y2(t)]2, sampling the signal y(t) at instants tk=kT with T=symbol interval to obtain samples y(tk), computing the mean square error e(k)=y(tk)?u(k) with u(k) equal to the symbol transmitted, and adjusting the parameters of the compensator to seek to minimize e(k).Type: GrantFiled: December 3, 2002Date of Patent: October 28, 2008Assignee: Ericsson ABInventors: Giulio Colavolpe, Enrico Forestieri, Giancarlo Prati