Patents by Inventor Raffaele Corsini
Raffaele Corsini 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: 9425900Abstract: Chromatic dispersion (CD) processing apparatus comprises an equalizer loop comprising: a frequency domain equalizer (FDE) arranged to receive samples of an electrical representation of an optical communications signal having CD and to apply CD compensation to the samples, to form dispersion corrected samples having a residual CD value; a time domain equalizer arranged to receive the corrected samples and to generate a representation of a channel linear transfer function of the signal from the corrected samples, to generate and transmit a monitoring signal comprising said representation; optical performance monitoring apparatus arranged to receive the monitoring signal and to estimate the residual CD value; and a processor arranged to receive the estimated residual value and to compare it to a threshold value and to generate and transmit to the FDE an estimation signal comprising the estimated value unless it is less than the threshold.Type: GrantFiled: March 2, 2012Date of Patent: August 23, 2016Assignee: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)Inventors: Roberto Magri, Raffaele Corsini, Ernesto Ciaramella, Emma Matarazzo, Andrea Peracchi
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Publication number: 20150229410Abstract: Chromatic dispersion (CD) processing apparatus comprises an equalizer loop comprising: a frequency domain equaliser (FDE) arranged to receive samples of an electrical representation of an optical communications signal having CD and to apply CD compensation to the samples, to form dispersion corrected samples having a residual CD value; a time domain equaliser arranged to receive the corrected samples and to generate a representation of a channel linear transfer function of the signal from the corrected samples, to generate and transmit a monitoring signal comprising said representation; optical performance monitoring apparatus arranged to receive the monitoring signal and to estimate the residual CD value; and a processor arranged to receive the estimated residual value and to compare it to a threshold value and to generate and transmit to the FDE an estimation signal comprising the estimated value unless it is less than the threshold.Type: ApplicationFiled: March 2, 2012Publication date: August 13, 2015Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)Inventors: Roberto Magri, Raffaele Corsini, Ernesto Ciaramella, Emma Matarazzo, Andrea Peracchi
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Patent number: 8824886Abstract: A method of monitoring a differential group delay (DGD) of an optical communications signal having a polarisation multiplexed modulation format is described. The method includes the operations of receiving a signal and performing analogue to digital conversion of the signal to generate a digitised signal corresponding to one polarisation of the signal and to generate another digitised signal corresponding to another polarisation of the signal, and applying a polarisation mode dispersion(PMD) compensation to each of the digitised signals. The method further includes the operations of obtaining an indication of the channel transfer function of the optical communications signal, determining a DGD in dependence on the indication of the channel transfer function, determining a delay between the PMD compensated digitised signals, subtracting the delay from the DGD to obtain a corrected DGD, and generating and transmitting a monitoring signal with an indication of the corrected DGD.Type: GrantFiled: October 4, 2011Date of Patent: September 2, 2014Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Roberto Magri, Raffaele Corsini, Ernesto Ciaramella, Emma Matarazzo, Andrea Peracchi
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Publication number: 20130051793Abstract: A method of monitoring a differential group delay, DGD, of an optical communications signal having a polarisation multiplexed modulation format is described. The method includes the steps of receiving a signal and performing analogue to digital conversion of the signal to generate a digitised signal corresponding to one polarisation of the signal and to generate another digitised signal corresponding to another polarisation of the signal, and applying a polarisation mode dispersion, PMD, compensation to each of the digitised signals. The method further includes the steps of obtaining an indication of the channel transfer function of the optical communications signal, determining a DGD in dependence on the indication of the channel transfer function, determining a delay between the PMD compensated digitised signals, subtracting the delay from the DGD to obtain a corrected DGD, and generating and transmitting a monitoring signal with an indication of the corrected DGD.Type: ApplicationFiled: October 4, 2011Publication date: February 28, 2013Inventors: ROBERTO MAGRI, RAFFAELE CORSINI, ERNESTO CIARAMELLA, EMMA MATARAZZO, ANDREA PERACCHI
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Patent number: 8300306Abstract: A Raman amplifier includes at least a first and a second optical Raman-active fiber disposed in series with each other. A first pump source is connected to the first Raman-active fiber, and is adapted for emitting and coupling into the first Raman-active fiber a first pump radiation including a first group of frequencies. A second pump source is connected to the second Raman-active fiber, and is adapted for emitting and coupling into the second Raman-active fiber a second pump radiation including a second group of frequencies. The whole of said first and second group of frequencies extends over a pump frequency range having a width of at least the 40% of the Raman shift. The minimum and the maximum frequency in each of said first and second group of frequencies differ with each other of at most the 70% of said Raman shift.Type: GrantFiled: October 4, 2010Date of Patent: October 30, 2012Assignee: Google Inc.Inventors: Attilio Bragheri, Giulia Pietra, Raffaele Corsini, Danilo Caccioli
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Publication number: 20110080634Abstract: A Raman amplifier includes at least a first and a second optical Raman-active fiber disposed in series with each other. A first pump source is connected to the first Raman-active fiber, and is adapted for emitting and coupling into the first Raman-active fiber a first pump radiation including a first group of frequencies. A second pump source is connected to the second Raman-active fiber, and is adapted for emitting and coupling into the second Raman-active fiber a second pump radiation including a second group of frequencies. The whole of said first and second group of frequencies extends over a pump frequency range having a width of at least the 40% of the Raman shift. The minimum and the maximum frequency in each of said first and second group of frequencies differ with each other of at most the 70% of said Raman shift.Type: ApplicationFiled: October 4, 2010Publication date: April 7, 2011Inventors: Attilio Bragheri, Giulia Pietra, Raffaele Corsini, Danilo Caccioli
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Patent number: 7813034Abstract: A Raman amplifier comprises at least a first and a second optical Raman-active fiber disposed in series with each other. A first pump source is connected to the first Raman-active fiber, and is adapted for emitting and coupling into the first Raman-active fiber a first pump radiation including a first group of frequencies. A second pump source is connected to the second Raman-active fiber, and is adapted for emitting and coupling into the second Raman-active fiber a second pump radiation including a second group of frequencies. The whole of said first and second group of frequencies extends over a pump frequency range having a width of at least the 40% of the Raman shift. The minimum and the maximum frequency in each of said first and second group of frequencies differ with each other of at most the 70% of said Raman shift.Type: GrantFiled: May 18, 2007Date of Patent: October 12, 2010Assignee: PGT Photonics S.p.A.Inventors: Attilio Bragheri, Giulia Pietra, Raffaele Corsini, Danilo Caccioli
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Publication number: 20070223085Abstract: A Raman amplifier comprises at least a first and a second optical Raman-active fiber disposed in series with each other. A first pump source is connected to the first Raman-active fiber, and is adapted for emitting and coupling into the first Raman-active fiber a first pump radiation including a first group of frequencies. A second pump source is connected to the second Raman-active fiber, and is adapted for emitting and coupling into the second Raman-active fiber a second pump radiation including a second group of frequencies. The whole of said first and second group of frequencies extends over a pump frequency range having a width of at least the 40% of the Raman shift. The minimum and the maximum frequency in each of said first and second group of frequencies differ with each other of at most the 70% of said Raman shift.Type: ApplicationFiled: May 18, 2007Publication date: September 27, 2007Inventors: Attilio Bragheri, Giulia Pietra, Raffaele Corsini, Danilo Caccioli
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Patent number: 7253944Abstract: A Raman amplifier having at least a first and a second optical Raman-active fiber disposed in series with each other is disclosed. A first pump source is connected to the first Raman-active fiber, and is adapted for emitting and coupling into the first Raman-active fiber a first pump radiation including a first group of frequencies. A second pump source is connected to the second Raman-active fiber, and is adapted for emitting and coupling into the second Raman-active fiber a second pump radiation including a second group of frequencies. The whole of the first and second group of frequencies extends over a pump frequency range having a width of at least 40% of the Raman shift. The minimum and the maximum frequency in each of the first and second group of frequencies differ from each other by at most 70% of the Raman shift.Type: GrantFiled: July 31, 2002Date of Patent: August 7, 2007Assignee: Pirelli & C. S.p.A.Inventors: Attilio Bragheri, Giulia Pietra, Raffaele Corsini, Danilo Caccioli
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Publication number: 20060109543Abstract: A Raman amplifier having at least a first and a second optical Raman-active fiber disposed in series with each other is disclosed. A first pump source is connected to the first Raman-active fiber, and is adapted for emitting and coupling into the first Raman-active fiber a first pump radiation including a first group of frequencies. A second pump source is connected to the second Raman-active fiber, and is adapted for emitting and coupling into the second Raman-active fiber a second pump radiation including a second group of frequencies. The whole of the first and second group of frequencies extends over a pump frequency range having a width of at least 40% of the Raman shift. The minimum and the maximum frequency in each of the first and second group of frequencies differ from each other by at most 70% of the Raman shift.Type: ApplicationFiled: July 31, 2002Publication date: May 25, 2006Inventors: Attilio Bragheri, Giulia Pietra, Raffaele Corsini, Danilo Caccioli
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Patent number: 6867902Abstract: Device for performing a parametric process, comprising a substantially periodic photonic crystal structure comprising a plurality of unitary cells each comprising a first layer having a first refractive index n1 and a first length L1, a second layer having a second refractive index n2, with n1 different from n2, and a second length L2, a third layer having a third refractive index n3, with n3 different from n2, and a third length L3 and a fourth layer having a fourth refractive index n4, with n4 different from n1 and from n3, and a fourth length L4, ?wherein at least one among the first, the second, the third and the fourth layers has a non-linearity of the ?2 or ?3 type; at least one of the following conditions is met: ?a) n1 is different from n3; ?b) n2 is different from n4; ?c) L1 is different from L3; ?d) L2 is different from L4; and n1, n2, n3, n4, L1, L2, L3, L4 have such values as to perform the parametric process in phase matching conditions.Type: GrantFiled: May 1, 2002Date of Patent: March 15, 2005Assignee: Pirelli Cavi e Sistemi S.p.A.Inventors: Marco Romagnoli, Luciano Socci, Raffaele Corsini, Michele Midrio
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Publication number: 20030039023Abstract: Device for performing a parametric process, comprising a substantially periodic photonic crystal structure comprising a plurality of unitary cells each comprisingType: ApplicationFiled: May 1, 2002Publication date: February 27, 2003Inventors: Marco Romagnoli, Luciano Socci, Raffaele Corsini, Michele Midrio
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Patent number: 5796764Abstract: A rare-earth doped, lithium niobate, diffusion Bragg reflector laser having a simplified structure and improved efficiency is disclosed. The laser has a pump source, a wavelength division multiplexer, a substrate of lithium niobate doped with at least one rare earth element and having a feedback element, and a grating reflector. The grating reflector is formed from portions of an optical fibre and abuts one end of the doped substrate, such that the grating reflector and the feedback element of the doped substrate form a cavity for the laser. The doped substrate may include phase or amplitude modulators for FM or AM mode-locking operation.Type: GrantFiled: December 5, 1996Date of Patent: August 18, 1998Assignee: Pirelli Cavi S.p.A.Inventors: Raffaele Corsini, Dietmar Hiller