Patents by Inventor Hamid R. Khazaei

Hamid R. Khazaei 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).

  • Patent number: 7366364
    Abstract: An optical multiplexer includes a substrate into which are integrated a polarization rotator and a polarization coupler. The polarization coupler and the polarization rotator are in optical communication with each other.
    Type: Grant
    Filed: June 27, 2007
    Date of Patent: April 29, 2008
    Assignee: JDS Uniphase Corporation
    Inventors: Harmeet Singh, Hamid R. Khazaei, Kirk Lewis, Emily Squires
  • Patent number: 7212708
    Abstract: In an optical grating device, a grating arrangement receives different wavelength output signals from a plurality of radiation sources at input ports thereof, and generates therefrom a multiplexed wavelength output signal at a zero diffraction order output port of the grating arrangement. Additionally, the gating arrangement generates at least one predetermined wavelength output signal at one of a group consisting of a separate predetermined location in an at least one of a symmetric non-zero diffraction order of the grating arrangement, within the grating arrangement itself, and a combination thereof. A separate power tap is coupled to detect the power of a separate one of the at least one predetermined wavelength output signal from the grating arrangement.
    Type: Grant
    Filed: October 22, 2003
    Date of Patent: May 1, 2007
    Assignee: JDS Uniphase Corporation
    Inventors: Hsing Cheng, Hamid R. Khazaei, Harmeet Singh, Emily M. Squires
  • Patent number: 7031354
    Abstract: In a stabilized laser system, an output of a desired wavelength is generated. Each of a plurality of n lasers, which, while emitting light and having a preselected portion thereof fed back thereto, causes the fed back portion to be amplified and shifted in wavelength in a first direction which is spaced apart from the center wavelength of the feedback signal. A feedback stabilization arrangement is coupled to output ports of the plurality of n lasers for generating a feedback signal having a wavelength spectrum peaking at a wavelength shifted in an opposite direction to the first direction generated by the lasers in response to the feedback signal so as to provide an output signal at the output of the stabilized laser system having a wavelength spectrum that peaks essentially at the desired wavelength. A reflector is located at a predetermined signal round-trip time delay distance from the feedback stabilization arrangement.
    Type: Grant
    Filed: February 11, 2004
    Date of Patent: April 18, 2006
    Assignee: Optovia Corporation
    Inventors: Hsing Cheng, Hongmin Chen, Hamid R. Khazaei
  • Patent number: 7031355
    Abstract: In a stabilized laser system, a an output signal is to be generated having a desired central wavelength. At least one laser, which, while emitting light and having a preselected portion thereof fed back thereto, causes the output signal of the laser to be shifted in wavelength in a first direction which is spaced apart from the center wavelength of the fed back signal. A feedback generating arrangement processes a first portion of the output signal from each laser and generates a feedback signal having a spectral response peaking at a wavelength shifted in an opposite direction to the first direction generated by each laser. The feedback signal each laser to provide an output signal at the output of the stabilized laser system having a spectral response that peaks essentially at the desired wavelength.
    Type: Grant
    Filed: February 11, 2004
    Date of Patent: April 18, 2006
    Assignee: Optovia Corporation
    Inventors: Hamid R. Khazaei, Hongmin Chen, David Kirk Lewis, Hsing Cheng
  • Patent number: 6975797
    Abstract: A basic reflector arrangement has first and second power splitters. Each power splitter has first to fourth ports where the first port of the first power splitter is coupled to a remote signal source for receiving signals therefrom and providing feedback signals thereto. Signals received at each of the first and fourth ports of each power splitter are combined and split into first and second portions for transmission via the second and third ports, respectively, and signals received at the second and third ports are combined and split into first and second portions for transmission via the first and fourth ports, respectively. The second port of the second power splitter is coupled to provide an output signal from the reflector arrangement, and the first, third, and fourth ports thereof are coupled to the second, third, and fourth ports, respectively, of the first power splitter.
    Type: Grant
    Filed: February 11, 2004
    Date of Patent: December 13, 2005
    Assignee: Optovia Corporation
    Inventors: Hongmin Chen, Hamid R. Khazaei
  • Patent number: 6947633
    Abstract: A tunable dispersion compensator that includes a free propagation region and an adjustment region. The free propagation region includes a first end and a second end, and allows an input lightwave signal having component signals with different wavelengths to propagate from the first end to the second end. The adjustment region directs the input lightwave into portions of the input lightwave, adjusts a characteristic of the portions of the input lightwave signal at the second end, and directs the adjusted portions of the input lightwave signal back towards the first end. The adjusted portions of the input lightwave signal combine at the first end to generate an output lightwave signal having a phase profile that is different from a phase profile of the input lightwave signal.
    Type: Grant
    Filed: October 28, 2002
    Date of Patent: September 20, 2005
    Assignee: OptoVia Corporation
    Inventors: Harmeet Singh, Hamid R. Khazaei
  • Patent number: 6947639
    Abstract: A polarization coupler includes a stress-inducing feature disposed to generate a stress-field in a substrate. First and second waveguides each have a coupling portion that pass through the stress-field. First and second periodic-structures are in optical communication with the coupling portions of the first and second waveguides.
    Type: Grant
    Filed: November 18, 2002
    Date of Patent: September 20, 2005
    Assignee: OpteVia Corporation
    Inventors: Harmeet Singh, Hamid R. Khazaei
  • Patent number: 6937795
    Abstract: In an optical device, each of a plurality of radiation sources generates a separate different wavelength output signal to a wavelength locking device wherein a grating device receives the separate wavelength output signals from the plurality of radiation sources. The grating device generates a multiplexed wavelength output signal at a zero diffraction order output port thereof, and resolves separate symmetric wavelength?? and wavelength?? output signals at separate predetermined locations within at least one non-zero diffraction order thereof for each of the radiation sources. Each of a plurality of radiation detectors is coupled to receive a separate one of the symmetric wavelength?? and wavelength?? output signals and generate an output signal representing the magnitude of the received wavelength output signal.
    Type: Grant
    Filed: October 22, 2003
    Date of Patent: August 30, 2005
    Assignee: Optovia Corporation
    Inventors: Emily M. Squires, Hamid R. Khazaei
  • Patent number: 6931034
    Abstract: An optical system has a transmission filter device, a feedback mechanism, and one or more radiation sources. Each radiation source generates an output signal with a predetermined wavelength band and polarization and is coupled to a separate input port of the transmission filter device. The transmission filter device, which is responsive to output signal from each radiation source, generates an output signal from at least one output port thereof. The feedback mechanism is coupled to at least one output port of the transmission filter device for providing a feedback signal that is directed back through the transmission filter device to each of the radiation sources for stabilizing each of the radiation sources. The apparatus is polarization maintaining wherein the one or more radiation sources, the transmission filter device, and the feedback mechanism are interconnected such that principle axes of polarization thereof are substantially aligned.
    Type: Grant
    Filed: August 15, 2003
    Date of Patent: August 16, 2005
    Assignee: Optovia Corporation
    Inventors: Hamid R. Khazaei, Harmeet Singh, Emily M. Squires, David Kirk Lewis
  • Patent number: 6892008
    Abstract: In a star coupler, a Free Propagation Region (FPR) is bounded by a first interface and a second opposing interface, and guides an input signal launched from the first interface in a predetermined first plane while allowing the input signal to travel unguided in a predetermined second plane in the FPR which is orthogonal to the first plane. A plurality of output waveguides are formed in an array and terminate at the second interface of the FPR. The axis of each output waveguide at the second interface is separated from an axis of an adjacent output waveguide by a predetermined distance “t”. An input waveguide is split into a plurality of subsections which each terminate at the first interface of the FPR. The subsections of the input waveguide are arranged for simultaneously launching parts of the input signal into the FPR which diffracts and produces mode patterns at the second interface having a maximum intensity at inputs of each of the output waveguides, and a low intensity elsewhere.
    Type: Grant
    Filed: February 14, 2003
    Date of Patent: May 10, 2005
    Assignee: Optovia Corporation
    Inventors: Harmeet Singh, Hamid R. Khazaei
  • Publication number: 20040161200
    Abstract: In a star coupler, a Free Propagation Region (FPR) is bounded by a first interface and a second opposing interface, and guides an input signal launched from the first interface in a predetermined first plane while allowing the input signal to travel unguided in a predetermined second plane in the FPR which is orthogonal to the first plane. A plurality of output waveguides are formed in an array and terminate at the second interface of the FPR. The axis of each output waveguide at the second interface is separated from an axis of an adjacent output waveguide by a predetermined distance “t”. An input waveguide is split into a plurality of subsections which each terminate at the first interface of the FPR. The subsections of the input waveguide are arranged for simultaneously launching parts of the input signal into the FPR which diffracts and produces mode patterns at the second interface having a maximum intensity at inputs of each of the output waveguides, and a low intensity elsewhere.
    Type: Application
    Filed: February 14, 2003
    Publication date: August 19, 2004
    Inventors: Harmeet Singh, Hamid R. Khazaei
  • Publication number: 20040096136
    Abstract: A polarization rotator includes a substrate on which is disposed a stress-inducing feature for generating a stress-field within the substrate. A portion of a waveguide passes through this stress field. This stress field induces a birefringence that causes light passing through the portion of the waveguide to have its polarization rotated.
    Type: Application
    Filed: November 18, 2002
    Publication date: May 20, 2004
    Inventors: Harmeet Singh, Hamid R. Khazaei
  • Publication number: 20040096141
    Abstract: An optical multiplexer includes a substrate into which are integrated a polarization rotator and a polarization coupler. The polarization coupler and the polarization rotator are in optical communication with each other.
    Type: Application
    Filed: November 18, 2002
    Publication date: May 20, 2004
    Inventors: Harmeet Singh, Hamid R. Khazaei, Kirk Lewis, Emily Squires
  • Publication number: 20040096155
    Abstract: A polarization coupler includes a stress-inducing feature disposed to generate a stress-field in a substrate. First and second waveguides each have a coupling portion that pass through the stress-field. First and second periodic-structures are in optical communication with the coupling portions of the first and second waveguides.
    Type: Application
    Filed: November 18, 2002
    Publication date: May 20, 2004
    Inventors: Harmeet Singh, Hamid R. Khazaei
  • Publication number: 20040081393
    Abstract: A tunable dispersion compensator that includes a free propagation region and an adjustment region. The free propagation region includes a first end and a second end, and allows an input lightwave signal having component signals with different wavelengths to propagate from the first end to the second end. The adjustment region directs the input lightwave into portions of the input lightwave, adjusts a characteristic of the portions of the input lightwave signal at the second end, and directs the adjusted portions of the input lightwave signal back towards the first end. The adjusted portions of the input lightwave signal combine at the first end to generate an output lightwave signal having a phase profile that is different from a phase profile of the input lightwave signal.
    Type: Application
    Filed: October 28, 2002
    Publication date: April 29, 2004
    Inventors: Harmeet Singh, Hamid R. Khazaei