Patents by Inventor Lorenzo Bolla
Lorenzo Bolla 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: 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: 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