Patents by Inventor Qianfan Xu

Qianfan Xu 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: 20090103854
    Abstract: Various embodiments of the present invention are directed to photonic interconnects that can be used for on-chip as well as off-chip communications between computer system components. In one embodiment of the present invention, a photonic interconnect comprises a plurality of on-chip waveguides. Additionally, the photonic interconnect may include a plurality of off-chip waveguides, and at least one optoelectronic converter. The at least one optoelectronic converter can be photonically coupled to a portion of the plurality of on-chip waveguides, can be photonically coupled to a portion of the plurality of off-chip waveguides, and is in electronic communication with at least one computer system component.
    Type: Application
    Filed: October 23, 2007
    Publication date: April 23, 2009
    Inventors: Raymond G. Beausoleil, Marco Fiorentino, Norman Paul Jouppi, Nathan Lorenzo Binkert, Robert Samuel Schreiber, Qianfan Xu
  • Patent number: 7519257
    Abstract: A high-index-contrast waveguide structure material used to guide light through a low-refractive-index material. In one embodiment, the waveguide structures are capable of guiding and confining light in such a way that very high optical intensity is obtained in a small cross-sectional area or gap filled with any material with sufficiently low refractive index, relative to the remainder of the structure. The structure may be used to form resonators, optical couplers, directional optical couplers and other optical devices. Structures may be formed consistent with integrated circuit forming processes.
    Type: Grant
    Filed: November 25, 2005
    Date of Patent: April 14, 2009
    Assignee: Cornell Research Foundation, Inc.
    Inventors: Michal Lipson, Carlos Angulo Barrios, Vilson Rosa de Almeida, Roberto R. Panepucci, Qianfan Xu
  • Publication number: 20060228074
    Abstract: A high-index-contrast waveguide structure material used to guide light through a low-refractive-index material. In one embodiment, the waveguide structures are capable of guiding and confining light in such a way that very high optical intensity is obtained in a small cross-sectional area or gap filled with any material with sufficiently low refractive index, relative to the remainder of the structure. The structure may be used to form resonators, optical couplers, directional optical couplers and other optical devices. Structures may be formed consistent with integrated circuit forming processes.
    Type: Application
    Filed: November 25, 2005
    Publication date: October 12, 2006
    Inventors: Michal Lipson, Carlos Barrios, Vilson Almeida, Roberto Panepucci, Qianfan Xu
  • Publication number: 20060215949
    Abstract: A silicon electro-optic waveguide modulator is formed using a metal-oxide-semiconductor (MOS) configuration. Various embodiments are described using different modes of operation of the MOS diode and gate oxide thicknesses. In one example, a high-speed submicron waveguide active device is formed using silicon-on-insulator. A micro-ring resonator intensity-modulator exhibits switching times on the order of tens of pS with modulation depth of 73% with a bias voltage of 5 volts.
    Type: Application
    Filed: March 3, 2006
    Publication date: September 28, 2006
    Inventors: Michal Lipson, Bradley Schmidt, Sameer Pradhan, Qianfan Xu