Patents by Inventor Paola Galli
Paola Galli 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: 8923700Abstract: An optical device includes an optical splitter having an input port, a first output port and a second output port and is adapted to receive at said input port a WDM optical signal including a plurality of channels equally spaced by a frequency spacing and occupying an optical bandwidth, and wherein the optical splitter is adapted to output at the first and second output ports, respectively, a first and a second portion of the optical signal; an optical combiner having a respective first and second input ports and a respective output port; a first optical path optically connecting the first output port of the optical splitter to the first input port of the optical combiner; a second optical path optically connecting the second output port of the optical splitter to the second input port of the optical combiner, a first optical filter optically coupled along the first optical path, and a second optical filter optically coupled to the second optical path and the free spectral range of both the first and the secoType: GrantFiled: December 28, 2005Date of Patent: December 30, 2014Assignee: Google Inc.Inventors: Luciano Socci, Paola Galli, Silvia Ghidini, Marco Romagnoli
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Publication number: 20140219664Abstract: An optical communication system and method of use are described. The system comprises an optical source adapted to receive a digitally encoded data signal comprising sequences of data at a data rate (B) and comprising two signal levels representing a first state and a second state of the data signal, the optical source being adapted to produce an optical signal substantially frequency modulated with frequency excursion ?? comprising a first instantaneous frequency (?0) associated to the first state and a second instantaneous frequency (?1) associated to the second state; an optical converter adapted to receive the substantially frequency modulated optical signal, the optical converter having an optical transfer function varying with frequency and including at least one pass band, the at least one pass band having a peak transmittance and at least a low-transmittance region.Type: ApplicationFiled: July 25, 2013Publication date: August 7, 2014Applicant: MOSAID TECHNOLOGIES INCORPORATEDInventors: Marco ROMAGNOLI, Paola GALLI
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POLARIZATION STABILIZATION SCHEME FOR UN-COOLED SELF-TUNING CAVITY FOR COLORLESS ULTRA BROADBAND PON
Publication number: 20140029945Abstract: An optical transmitter for a WDM (Wavelength Division Multiplexing) passive optical network (PON) and a WDM PON comprising such an optical transmitter are disclosed. An optical transmitter comprises first mirror and second mirrors at first end and second ends of a cavity; an optical amplifier positioned within the cavity upstream from the first mirror and for amplifying light polarized in a first polarization plane; an optical waveguide for transmitting light from the optical amplifier to the second mirror and vice versa; a first non-reciprocal polarization rotator upstream of the optical amplifier and downstream of the optical waveguide; and a second non-reciprocal polarization rotator upstream of the optical waveguide and downstream of the first mirror; wherein the first and second non-reciprocal polarization rotators rotate the polarization of the light such that light which re-enters the optical amplifier after having been reflected by the second mirror is polarized in the first polarization plane.Type: ApplicationFiled: April 13, 2012Publication date: January 30, 2014Inventors: Mario Martinelli, Giancarlo Gavioli, Paola Galli, Domenico Di Mola, Paola Parolari, Lucia Marazzi, Luca Razzetti, Luca Suberini, Domenico Campi -
Patent number: 8498543Abstract: An optical communication system and method of use are described. The system comprises an optical source adapted to receive a digitally encoded data signal comprising sequences of data at a data rate (B) and comprising two signal levels representing a first state and a second state of the data signal, the optical source being adapted to produce an optical signal substantially frequency modulated with frequency excursion ?? comprising a first instantaneous frequency (?0) associated to the first state and a second instantaneous frequency (?1) associated to the second state; an optical converter adapted to receive the substantially frequency modulated optical signal, the optical converter having an optical transfer function varying with frequency and including at least one pass band, the at least one pass band having a peak transmittance and at least a low-transmittance region.Type: GrantFiled: November 15, 2011Date of Patent: July 30, 2013Assignee: Mosaid Technologies IncorporatedInventors: Marco Romagnoli, Paola Galli
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Patent number: 8494317Abstract: The method for filtering an optical signal comprising a plurality of channels lying on a grid of optical frequencies equally spaced by a frequency spacing and occupying an optical bandwidth, comprises: a) operating an optical filter comprising a plurality of resonators, wherein a first resonator of the plurality is optically coupled to the optical signal and the remaining resonators are optically coupled in series to the first resonator, so that a respective resonance of each one of the plurality of resonators falls within a first frequency band having bandwidth less than or equal to 15 GHz; b) operating the optical filter so as to obtain a separation between said respective resonance of at least one resonator with respect to said respective resonance of at least another different resonator, the separation being greater than or equal to 25 GHz; c) operating the optical filter so that said respective resonance of each one of the plurality of resonators falls within a second frequency band, different from the fType: GrantFiled: November 9, 2006Date of Patent: July 23, 2013Assignee: Google Inc.Inventors: Lorenzo Bolla, Paola Galli, Silvia Ghidini, Marco Romagnoli, Luciano Socci
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Patent number: 8494318Abstract: A method of filtering an optical signal includes operating an optical filter having resonators, each having a respective free spectral range and a respective resonance falling within a first frequency band, first tuning at least one resonator with respect to at least another resonator to obtain a separation between any resonance of at least one resonator falling within an optical bandwidth with respect to a resonance of at least another resonator nearest to the any resonance, second tuning all the resonators of the optical filter so as to move all respective resonances by a respective frequency interval greater than a frequency spacing, and third tuning the at least one resonator and the at least another resonator such that a further respective resonance of each one of the resonators falls within a second frequency band, different from the first frequency band.Type: GrantFiled: November 9, 2006Date of Patent: July 23, 2013Assignee: Google Inc.Inventors: Lorenzo Bolla, Paola Galli, Silvia Ghidini, Giorgio Grasso, Marco Romagnoli, Luciano Socci
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Patent number: 8483528Abstract: An optical mode transformer comprises a first waveguide including a first core, a first cladding and an end facet configured to be coupled to an optical fiber. A second waveguide comprises a second core and a second cladding, and is arranged with respect to the first waveguide so as to realize an evanescent optical coupling with the first waveguide. The second core comprises a tapered region, in at least a portion of which the evanescent coupling takes place. The first core and the second core are separated by a gap. A first refractive index contrast of the first waveguide is less than a second refractive index contrast of the second waveguide.Type: GrantFiled: February 29, 2008Date of Patent: July 9, 2013Assignee: Google Inc.Inventors: Luciano Socci, Lorenzo Bolla, Paola Galli, Marco Romagnoli, Silvia Ghidini
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Patent number: 8320721Abstract: An optical mode transformer comprises a first waveguide including a first core, a first cladding and an end facet configured to be coupled to an optical fiber. The transformer further includes a second waveguide comprising a second core, a second cladding and an end directly coupled to an end of the first waveguide. A third waveguide comprises a third core and a third cladding, and is arranged with respect to the second waveguide so as to realize an evanescent optical coupling with the second waveguide. The third core includes a tapered region wherein evanescent coupling takes place, and wherein a refractive index contrast of the first waveguide is less than a refractive index contrast of the second waveguide, the refractive index contrast of the second waveguide is less than a refractive index contrast of the third waveguide, and the refractive index contrast of the third waveguide is not less than 18%.Type: GrantFiled: February 29, 2008Date of Patent: November 27, 2012Assignee: Google Inc.Inventors: Gaia Cevini, Paola Galli, Stefano Lorenzotti, Marco Piazza, Marco Romagnoli, Luciano Socci, Lorenzo Bolla, Silvia Ghidini
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Publication number: 20120106891Abstract: An optical device includes an optical splitter having a resonant structure including at least a resonator, the optical splitter being adapted to receive at an input port a WDM optical signal and to output at first and second output ports, respectively, a first and a second portion of the optical signal, the second portion including the channels spaced by an integer multiple of the WDM frequency spacing; an optical combiner adapted to receive at first and second input ports, respectively, the first and the second portions and adapted to output them at an output port; a first optical path optically connecting the first output port to the first input port; a second optical path optically connecting the second output port to the second input port; and an optical filter optically coupled to the second optical path, wherein the optical combiner includes at least a resonator.Type: ApplicationFiled: December 13, 2011Publication date: May 3, 2012Applicant: MOSAID Technologies IncorporatedInventors: Luciano SOCCI, Paola Galli, Silvia Ghidini, Marco Romagnoli
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Publication number: 20120057881Abstract: An optical communication system and method of use are described. The system comprisesan optical source adapted to receive a digitally encoded data signal comprising sequences of data at a data rate (B) and comprising two signal levels representing a first state and a second state of the data signal, the optical source being adapted to produce an optical signal substantially frequency modulated with frequency excursion ?? comprising a first instantaneous frequency (?0) associated to the first state and a second instantaneous frequency (?1) associated to the second state; an optical converter adapted to receive the substantially frequency modulated optical signal, the optical converter having an optical transfer function varying with frequency and including at least one pass band, the at least one pass band having a peak transmittance and at least a low-transmittance region.Type: ApplicationFiled: November 15, 2011Publication date: March 8, 2012Applicant: PGT Photonics, S.p.A.Inventors: Marco Romagnoli, Paola Galli
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Patent number: 8095010Abstract: An optical device includes an optical splitter having an input port, a first output port, a second output port and a resonant structure including at least a resonator, the optical splitter being adapted to receive at the input port a WDM optical signal and to output at the first and second output ports, respectively, a first and a second portion of the optical signal, the second portion including the channels lying on a sub-grid of optical frequencies spaced by an integer multiple of the WDM frequency spacing; an optical combiner having a first input port, a second input port, an output port and adapted to receive at the first and second input ports, respectively, the first and the second portions and adapted to output them at said output port; a first optical path optically connecting the first output port of the optical splitter to the first input port of the optical combiner so as to propagate the first portion; a second optical path optically connecting the second output port of the optical splitter to thType: GrantFiled: December 28, 2005Date of Patent: January 10, 2012Assignee: Mosaid Technologies IncorporatedInventors: Luciano Socci, Paola Galli, Silvia Ghidini, Marco Romagnoli
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Patent number: 8064769Abstract: A method for switching from a first optical path optically coupled to an optical processing device to a second optical path, the first and second optical paths optically connecting, in parallel configuration, a first optical switch to a second optical switch, according to the following steps: directing optical radiation comprising at least a fast operating wavelength through the first optical path to the optical processing device, which is tuned to the first operating wavelength; tuning a resonant all-pass filter optically coupled to the second optical path so as to match, at least at a wavelength adjacent to the first operating wavelength, a phase distortion introduced by the optical processing device on the optical radiation; synchronously actuating the first and the second optical switch so as to switch the optical radiation from the first optical path to the second optical path.Type: GrantFiled: June 30, 2005Date of Patent: November 22, 2011Assignee: Mosaid Technologies IncorporatedInventors: Paola Galli, Silvia Ghidini, Marco Romagnoli, Luciano Socci, Francesco Tassone
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Patent number: 8064776Abstract: An optical communication system and method of use are described. The system comprises an optical source adapted to receive a digitally encoded data signal comprising sequences of data at a data rate (B) and comprising two signal levels representing a first state and a second state of the data signal, the optical source being adapted to produce an optical signal substantially frequency modulated with frequency excursion ?? comprising a first instantaneous frequency (?0) associated to the first state and a second instantaneous frequency (?1) associated to the second state; an optical converter adapted to receive the substantially frequency modulated optical signal, the optical converter having an optical transfer function varying with frequency and including at least one pass band, the at least one pass band having a peak transmittance and at least a low-transmittance region.Type: GrantFiled: December 16, 2008Date of Patent: November 22, 2011Assignee: PGT Photonics, S.p.AInventors: Marco Romagnoli, Paola Galli
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Publication number: 20110116741Abstract: An optical mode transformer comprises a first waveguide including a first core, a first cladding and an end facet configured to be coupled to an optical fiber. The transformer further includes a second waveguide comprising a second core, a second cladding and an end directly coupled to an end of the first waveguide. A third waveguide comprises a third core and a third cladding, and is arranged with respect to the second waveguide so as to realize an evanescent optical coupling with the second waveguide. The third core includes a tapered region wherein evanescent coupling takes place, and wherein a refractive index contrast of the first waveguide is less than a refractive index contrast of the second waveguide, the refractive index contrast of the second waveguide is less than a refractive index contrast of the third waveguide, and the refractive index contrast of the third waveguide is not less than 18%.Type: ApplicationFiled: February 29, 2008Publication date: May 19, 2011Inventors: Gaia Cevini, Paola Galli, Stefano Lorenzotti, Marco Piazza, Marco Romagnoli, Luciano Socci, Lorenzo Bolla, Silvia Ghidini
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Publication number: 20110026880Abstract: A semiconductor-based optical mode transformer (100, 100?, 100?) is described for coupling an optical mode of an optical fiber (3) with an optical mode of a waveguide (2a). The optical mode transformer comprises a first waveguide (1a) extending along a first main longitudinal direction (Z) and including an end facet (9) being apt to be coupled to the optical fiber (3), said first waveguide (1a) including a first core (1) and a first cladding (6,4) and having a first refractive index contrast (?n1); and a second waveguide (2a) arranged with respect to said first waveguide so as to realize an evanescent optical coupling with said first waveguide (1a), the second waveguide (2a) comprising a second core (2) and a second cladding (4,7) and having a second refractive index contrast (?n2). In addition, the second core (2) comprises a tapered region (13,13?), in at least a portion of which said evanescent coupling takes place.Type: ApplicationFiled: February 29, 2008Publication date: February 3, 2011Inventors: Paola Galli, Marco Romagnoli, Luciano Socci, Lorenzo Bolla, Silvia Ghidini
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Publication number: 20100196014Abstract: The method for filtering an optical signal comprising a plurality of channels lying on a grid of optical frequencies equally spaced by a frequency spacing and occupying an optical bandwidth, comprises: a) operating an optical filter comprising a plurality of resonators, wherein a first resonator of the plurality is optically coupled to the optical signal and the remaining resonators are optically coupled in series to the first resonator, so that a respective resonance of each one of the plurality of resonators falls within a first frequency band having bandwidth less than or equal to 15 GHz; b) operating the optical filter so as to obtain a separation between said respective resonance of at least one resonator with respect to said respective resonance of at least another different resonator, the separation being greater than or equal to 25 GHz; c) operating the optical filter so that said respective resonance of each one of the plurality of resonators falls within a second frequency band, different from the fType: ApplicationFiled: November 9, 2006Publication date: August 5, 2010Applicant: PGT PHOTONICS S.P.A.Inventors: Lorenzo Bolla, Paola Galli, Silvia Ghidini, Marco Romagnoli, Luciano Socci
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Publication number: 20100189441Abstract: The method for filtering an optical signal comprising a plurality of channels lying on a grid of optical frequencies equally spaced by a given frequency spacing and occupying an optical bandwidth, comprises: a) splitting the optical signal into a first and a second portion spatially separated, wherein the first portion comprises the channels which lie on a first sub-grid comprising a first set of the optical frequencies equally spaced by the double of the frequency spacing and the second portion substantially comprises the remaining channels; b) operating a first optical filter comprising a plurality of resonators, wherein a first resonator of the plurality is optically coupled to the first portion and the remaining resonators are optically coupled in series to the first resonator, so that a respective resonance of each one of the plurality of resonators falls within a first frequency band having bandwidth less than or equal to 15 GHz and comprising a first channel belonging to the first portion; c) operatingType: ApplicationFiled: November 9, 2006Publication date: July 29, 2010Applicant: PGT PHOTONICS S.P.A.Inventors: Lorenzo Bolla, Paola Galli, Silvia Ghidini, Marco Romagnoli, Luciano Socci
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Publication number: 20100183312Abstract: The method for filtering an optical signal comprising a plurality of channels lying on a grid of optical frequencies equally spaced by a frequency spacing and occupying an optical bandwidth, comprises: a) operating an optical filter comprising a plurality of resonators each having a respective free spectral range, wherein a first resonator of the plurality is optically coupled to the optical signal and the remaining resonators are optically coupled in series to the first resonator, so that a respective resonance of each one of the plurality of resonators falls within a first frequency band having bandwidth less than or equal to 15 GHz; b) operating the optical filter so as to obtain a separation between any resonance of at least one resonator falling within the optical bandwidth with respect to a resonance of at least another different resonator nearest to the any resonance, the separation being greater than or equal to 150 GHz and no more than 1 THz; c) tuning all the resonators of the optical filter so as tType: ApplicationFiled: November 9, 2006Publication date: July 22, 2010Applicant: PGT PHOTONICS S.P.A.Inventors: Lorenzo Bolla, Paola Galli, Silvia Ghidini, Giorgio Grasso, Marco Romagnoli, Luciano Socci
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Publication number: 20100040382Abstract: An optical communication system and method of use are described.Type: ApplicationFiled: December 16, 2008Publication date: February 18, 2010Applicant: PGT Photonics, S.p.A.Inventors: Marco Romagnoli, Paola Galli
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Publication number: 20090273842Abstract: An optical device includes an optical splitter having an input port, a first output port and a second output port and is adapted to receive at said input port a WDM optical signal including a plurality of channels equally spaced by a frequency spacing and occupying an optical bandwidth, and wherein the optical splitter is adapted to output at the first and second output ports, respectively, a first and a second portion of the optical signal; an optical combiner having a respective first and second input ports and a respective output port; a first optical path optically connecting the first output port of the optical splitter to the first input port of the optical combiner; a second optical path optically connecting the second output port of the optical splitter to the second input port of the optical combiner, a first optical filter optically coupled along the first optical path, and a second optical filter optically coupled to the second optical path and the free spectral range of both the first and the secoType: ApplicationFiled: December 28, 2005Publication date: November 5, 2009Inventors: Luciano Socci, Paola Galli, Silvia Ghidini, Marco Romagnoli