Patents by Inventor Benjamin G. Lee
Benjamin G. Lee 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).
-
Publication number: 20160277319Abstract: A method for generating a switch fabric topology, comprising constructing a first switch fabric topology, modifying the first switch fabric topology to generate a second switch fabric topology, wherein modifying the first switch fabric topology comprises isolating center stage sets of the first switch fabric topology, and replacing each of the isolated center stage sets with a single × switching element to generate the second switch fabric topology, wherein is an integer representing a radix of the switching element determined in connection with the constructing of the first switch fabric topology.Type: ApplicationFiled: March 20, 2015Publication date: September 22, 2016Inventors: Benjamin G. Lee, Cyriel J. Minkenberg
-
Publication number: 20160269141Abstract: Tuning parameters of individual wavelength channels transmitted over a multimode optical fiber is provided. Characteristics of the multimode optical fiber used for an optical data link within an optical signal transmission system are retrieved. A wavelength channel grid including each central wavelength in a plurality of central wavelengths that corresponds to each particular wavelength channel in a plurality of wavelength channels used to transmit data via optical signals over the multimode optical fiber is determined. A maximum allowable data rate is calculated for each wavelength channel based on the characteristics of the multimode optical fiber at defined channel wavelengths, optical signal transceiver specifications, and data transmission performance requirements for the optical signal transmission system.Type: ApplicationFiled: June 19, 2015Publication date: September 15, 2016Inventors: Fuad E. Doany, Daniel M. Kuchta, Benjamin G. Lee, Petar K. Pepeljugoski, Clint L. Schow, Mehmet Soyuer
-
Publication number: 20160269124Abstract: Tuning parameters of individual wavelength channels transmitted over a multimode optical fiber is provided. Characteristics of the multimode optical fiber used for an optical data link within an optical signal transmission system are retrieved. A wavelength channel grid including each central wavelength in a plurality of central wavelengths that corresponds to each particular wavelength channel in a plurality of wavelength channels used to transmit data via optical signals over the multimode optical fiber is determined. A maximum allowable data rate is calculated for each wavelength channel based on the characteristics of the multimode optical fiber at defined channel wavelengths, optical signal transceiver specifications, and data transmission performance requirements for the optical signal transmission system.Type: ApplicationFiled: March 11, 2015Publication date: September 15, 2016Inventors: Fuad E. Doany, Daniel M. Kuchta, Benjamin G. Lee, Petar K. Pepeljugoski, Clint L. Schow, Mehmet Soyuer
-
Publication number: 20160195678Abstract: An optoelectronic integrated circuit for coupling light to or from an optical waveguide formed in an optical device layer in a near-normal angle to that layer. In an embodiment, the integrated circuit comprises a semiconductor body including a metal-dielectric stack, an optical device layer, a buried oxide layer and a semiconductor substrate arranged in series between first and second opposite sides of the semiconductor body. At least one optical waveguide is formed in the optical device layer for guiding light in a defined plane in that device layer. Diffractive coupling elements are disposed in the optical device layer to couple light from the waveguide toward the second surface of the semiconductor body at a near-normal angle to the defined plane in the optical device layer. In an embodiment, an optical fiber is positioned against the semiconductor body for receiving the light from the coupling elements.Type: ApplicationFiled: March 14, 2016Publication date: July 7, 2016Inventors: Fuad Doany, Benjamin G. Lee, Clint L. Schow
-
Patent number: 9285554Abstract: An optoelectronic integrated circuit for coupling light to or from an optical waveguide formed in an optical device layer in a near-normal angle to that layer. In an embodiment, the integrated circuit comprises a semiconductor body including a metal-dielectric stack, an optical device layer, a buried oxide layer and a semiconductor substrate arranged in series between first and second opposite sides of the semiconductor body. At least one optical waveguide is formed in the optical device layer for guiding light in a defined plane in that device layer. Diffractive coupling elements are disposed in the optical device layer to couple light from the waveguide toward the second surface of the semiconductor body at a near-normal angle to the defined plane in the optical device layer. In an embodiment, an optical fiber is positioned against the semiconductor body for receiving the light from the coupling elements.Type: GrantFiled: February 10, 2012Date of Patent: March 15, 2016Assignee: International Business Machines CorporationInventors: Fuad Doany, Benjamin G. Lee, Clint L. Schow
-
Patent number: 9268890Abstract: Designing a photonics switching system is provided. A photonic switch diode is designed to attain each performance metric in a plurality of performance metrics associated with a photonic switching system based on a weighted value corresponding to each of the plurality of performance metrics. A switch driver circuit is selected from a plurality of switch driver circuits for the photonic switching system. It is determined whether each performance metric associated with the photonic switching system meets or exceeds a threshold value corresponding to each of the plurality of performance metrics based on the designed photonic switch diode and the selected switch driver circuit. In response to determining that each performance metric associated with the photonic switching system meets or exceeds the threshold value corresponding to each of the performance metrics, the photonic switching system is designed using the designed photonic switch diode and the selected switch driver circuit.Type: GrantFiled: September 14, 2012Date of Patent: February 23, 2016Assignee: International Business Machines CorporationInventors: Benjamin G. Lee, Jonathan E. Proesel, Alexander V. Rylyakov, Clint L. Schow
-
Patent number: 9246310Abstract: A laser source based on a quantum cascade laser array (QCL), wherein the outputs of at least two elements in the array are collimated and overlapped in the far field using an external diffraction grating and a transform lens.Type: GrantFiled: August 3, 2011Date of Patent: January 26, 2016Assignees: President and Fellows of Harvard College, Massachusetts Institute of TechnologyInventors: Anish Goyal, Benjamin G. Lee, Christian Pfluegl, Laurent Diehl, Mikhail Belkin, Antonio Sanchez-Rubio, Federico Capasso
-
Patent number: 9229169Abstract: A photonic integrated circuit apparatus is disclosed. The apparatus includes a photonic chip and a lens array coupling element. The photonic chip includes a waveguide at a side edge surface of the photonic chip. The lens array coupling element is mounted on a top surface of the photonic chip and on the side edge surface. The coupling element includes a lens array that is configured to modify spot sizes of light traversing to or from the waveguide. The coupling element further includes an overhang on a side of the coupling element that opposes the lens array and that abuts the top surface of the photonic chip. The overhang includes a vertical stop surface that has a depth configured to horizontally align an edge of the waveguide with a focal length of the lens array and that vertically aligns focal points of the lens array with the edge of the waveguide.Type: GrantFiled: August 16, 2011Date of Patent: January 5, 2016Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Fuad E. Doany, Benjamin G. Lee, Clint L. Schow
-
Publication number: 20150346431Abstract: Aspects of the invention are directed to a method for forming an optical waveguide structure. Initially, a base film stack is received with an optical waveguide feature covered by a lower dielectric layer. An etch stop feature is then formed on the lower dielectric layer, and an upper dielectric layer is formed over the etch stop feature. Subsequently, a trench is patterned in the upper dielectric layer and the etch stop feature at least in part by utilizing the etch stop feature as an etch stop. Lastly, a waveguide coupler feature is formed in the trench, at least a portion of the waveguide coupler feature having a refractive index higher than the lower dielectric layer and the upper dielectric layer. The waveguide coupler feature is positioned over at least a portion of the optical waveguide feature but is separated from the optical waveguide feature by a portion of the lower dielectric layer.Type: ApplicationFiled: August 6, 2015Publication date: December 3, 2015Inventors: Russell A. Budd, Fuad E. Doany, Christopher V. Jahnes, Benjamin G. Lee, Laurent Schares
-
Publication number: 20150302124Abstract: Designing a photonics switching system is provided. A photonic switch diode is designed to attain each performance metric in a plurality of performance metrics associated with a photonic switching system based on a weighted value corresponding to each of the plurality of performance metrics. A switch driver circuit is selected from a plurality of switch driver circuits for the photonic switching system. It is determined whether each performance metric associated with the photonic switching system meets or exceeds a threshold value corresponding to each of the plurality of performance metrics based on the designed photonic switch diode and the selected switch driver circuit. In response to determining that each performance metric associated with the photonic switching system meets or exceeds the threshold value corresponding to each of the performance metrics, the photonic switching system is designed using the designed photonic switch diode and the selected switch driver circuit.Type: ApplicationFiled: September 14, 2012Publication date: October 22, 2015Applicant: International Business Machines CorporationInventors: Benjamin G. Lee, Jonathan E. Proesel, Alexander V. Rylyakov, Clint L. Schow
-
Patent number: 9103972Abstract: Aspects of the invention are directed to a method for forming an optical waveguide structure. Initially, a base film stack is received with an optical waveguide feature covered by a lower dielectric layer. An etch stop feature is then formed on the lower dielectric layer, and an upper dielectric layer is formed over the etch stop feature. Subsequently, a trench is patterned in the upper dielectric layer and the etch stop feature at least in part by utilizing the etch stop feature as an etch stop. Lastly, a waveguide coupler feature is formed in the trench, at least a portion of the waveguide coupler feature having a refractive index higher than the lower dielectric layer and the upper dielectric layer. The waveguide coupler feature is positioned over at least a portion of the optical waveguide feature but is separated from the optical waveguide feature by a portion of the lower dielectric layer.Type: GrantFiled: September 5, 2013Date of Patent: August 11, 2015Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Russell A. Budd, Fuad E. Doany, Christopher V. Jahnes, Benjamin G. Lee, Laurent Schares
-
Publication number: 20150063768Abstract: Aspects of the invention are directed to a method for forming an optical waveguide structure. Initially, a base film stack is received with an optical waveguide feature covered by a lower dielectric layer. An etch stop feature is then formed on the lower dielectric layer, and an upper dielectric layer is formed over the etch stop feature. Subsequently, a trench is patterned in the upper dielectric layer and the etch stop feature at least in part by utilizing the etch stop feature as an etch stop. Lastly, a waveguide coupler feature is formed in the trench, at least a portion of the waveguide coupler feature having a refractive index higher than the lower dielectric layer and the upper dielectric layer. The waveguide coupler feature is positioned over at least a portion of the optical waveguide feature but is separated from the optical waveguide feature by a portion of the lower dielectric layer.Type: ApplicationFiled: September 5, 2013Publication date: March 5, 2015Applicant: International Business Machines CorporationInventors: Russell A. Budd, Fuad E. Doany, Christopher V. Jahnes, Benjamin G. Lee, Laurent Schares
-
Patent number: 8901576Abstract: Processing for a silicon photonics wafer is provided. A silicon photonics wafer that includes an active silicon photonics layer, a thin buried oxide layer, and a silicon substrate is received. The thin buried oxide layer is located between the active silicon photonics layer and the silicon substrate. An electrical CMOS wafer that includes an active electrical layer is also received. The active silicon photonics layer of the silicon photonics wafer is flip chip bonded to the active electrical layer of the electrical CMOS wafer. The silicon substrate is removed exposing a backside surface of the thin buried oxide layer. A low-optical refractive index backing wafer is added to the exposed backside surface of the thin buried oxide layer. The low-optical refractive index backing wafer is a glass substrate or silicon substrate wafer. The silicon substrate wafer includes a thick oxide layer that is attached to the thin buried oxide layer.Type: GrantFiled: January 18, 2012Date of Patent: December 2, 2014Assignee: International Business Machines CorporationInventors: Fuad E. Doany, Benjamin G. Lee, Alexander V. Rylyakov, Clint L. Schow, Marc A. Taubenblatt
-
Patent number: 8805126Abstract: A method and structure for a modulator which includes a forward-biased diode optimized for power and area to perform a tuning function, and a reverse-biased diode optimized for speed to perform a modulation function.Type: GrantFiled: August 17, 2012Date of Patent: August 12, 2014Assignee: International Business Machines CorporationInventors: Benjamin G. Lee, Jeffrey A. Kash, Alexander V. Rylyakov, Clint L. Schow
-
Patent number: 8775992Abstract: Designing a photonics switching system is provided. A photonic switch diode is designed to attain each performance metric in a plurality of performance metrics associated with a photonic switching system based on a weighted value corresponding to each of the plurality of performance metrics. A switch driver circuit is selected from a plurality of switch driver circuits for the photonic switching system. It is determined whether each performance metric associated with the photonic switching system meets or exceeds a threshold value corresponding to each of the plurality of performance metrics based on the photonic switch diode designed and the switch driver circuit selected. In response to determining that each performance metric associated with the photonic switching system meets or exceeds the threshold value corresponding to each of the performance metrics, the photonic switching system is designed using the photonic switch diode designed and the switch driver circuit selected.Type: GrantFiled: September 5, 2012Date of Patent: July 8, 2014Assignee: International Business Machines CorporationInventors: Benjamin G. Lee, Jonathan E. Proesel, Alexander V. Rylyakov, Clint L. Schow
-
Publication number: 20140068534Abstract: Designing a photonics switching system is provided. A photonic switch diode is designed to attain each performance metric in a plurality of performance metrics associated with a photonic switching system based on a weighted value corresponding to each of the plurality of performance metrics. A switch driver circuit is selected from a plurality of switch driver circuits for the photonic switching system. It is determined whether each performance metric associated with the photonic switching system meets or exceeds a threshold value corresponding to each of the plurality of performance metrics based on the photonic switch diode designed and the switch driver circuit selected. In response to determining that each performance metric associated with the photonic switching system meets or exceeds the threshold value corresponding to each of the performance metrics, the photonic switching system is designed using the photonic switch diode designed and the switch driver circuit selected.Type: ApplicationFiled: September 5, 2012Publication date: March 6, 2014Applicant: International Business Machines CorporationInventors: Benjamin G. Lee, Jonathan E. Proesel, Alexander V. Rylyakov, Clint L. Schow
-
Publication number: 20140050436Abstract: A method and structure for a modulator which includes a forward-biased diode optimized for power and area to perform a tuning function, and a reverse-biased diode optimized for speed to perform a modulation function.Type: ApplicationFiled: August 17, 2012Publication date: February 20, 2014Applicant: International Business Machines CorporationInventors: Benjamin G. Lee, Jeffrey A. Kash, Alexander V. Rylyakov, Clint L. Schow
-
Publication number: 20130209026Abstract: An optoelectronic integrated circuit for coupling light to or from an optical waveguide formed in an optical device layer in a near-normal angle to that layer. In an embodiment, the integrated circuit comprises a semiconductor body including a metal-dielectric stack, an optical device layer, a buried oxide layer and a semiconductor substrate arranged in series between first and second opposite sides of the semiconductor body. At least one optical waveguide is formed in the optical device layer for guiding light in a defined plane in that device layer. Diffractive coupling elements are disposed in the optical device layer to couple light from the waveguide toward the second surface of the semiconductor body at a near-normal angle to the defined plane in the optical device layer. In an embodiment, an optical fiber is positioned against the semiconductor body for receiving the light from the coupling elements.Type: ApplicationFiled: February 10, 2012Publication date: August 15, 2013Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Fuad Doany, Benjamin G. Lee, Clint L. Schow
-
Publication number: 20130181233Abstract: Processing for a silicon photonics wafer is provided. A silicon photonics wafer that includes an active silicon photonics layer, a thin buried oxide layer, and a silicon substrate is received. The thin buried oxide layer is located between the active silicon photonics layer and the silicon substrate. An electrical CMOS wafer that includes an active electrical layer is also received. The active silicon photonics layer of the silicon photonics wafer is flip chip bonded to the active electrical layer of the electrical CMOS wafer. The silicon substrate is removed exposing a backside surface of the thin buried oxide layer. A low-optical refractive index backing wafer is added to the exposed backside surface of the thin buried oxide layer. The low-optical refractive index backing wafer is a glass substrate or silicon substrate wafer. The silicon substrate wafer includes a thick oxide layer that is attached to the thin buried oxide layer.Type: ApplicationFiled: January 18, 2012Publication date: July 18, 2013Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Fuad E. Doany, Benjamin G. Lee, Alexander V. Rylyakov, Clint L. Schow, Marc A. Taubenblatt
-
Publication number: 20130084039Abstract: A photonic integrated circuit apparatus is disclosed. The apparatus includes a photonic chip and a lens array coupling element. The photonic chip includes a waveguide at a side edge surface of the photonic chip. The lens array coupling element is mounted on a top surface of the photonic chip and on the side edge surface. The coupling element includes a lens array that is configured to modify spot sizes of light traversing to or from the waveguide. The coupling element further includes an overhang on a side of the coupling element that opposes the lens array and that abuts the top surface of the photonic chip. The overhang includes a vertical stop surface that has a depth configured to horizontally align an edge of the waveguide with a focal length of the lens array and that vertically aligns focal points of the lens array with the edge of the waveguide.Type: ApplicationFiled: August 16, 2011Publication date: April 4, 2013Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: FUAD E. DOANY, Benjamin G. Lee, Clint L. Schow