Patents by Inventor Krishna Thyagarajan

Krishna Thyagarajan 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).

  • Gate-tunable entangled photon pair generation
    Patent number: 12253788
    Abstract: An electro-optical modulating device and method that provides efficient control of the nonlinear propagation constant in an optical waveguide are featured. The electro-optical modulating device provides large wavelength tunability of the generated entangled photon pairs in real-time by using an applied external bias voltage. The electro-optical modulating device uses gate-tunable material at locations near the optical waveguide. The application of an external bias voltage creates a variable field-effect which in turn varies the optical dielectric properties of the waveguide. The result is a compact active, highly efficient wavelength-tunable integrated quantum photonic device for tunable entangled photon pair generation using an external bias voltage.
    Type: Grant
    Filed: October 10, 2022
    Date of Patent: March 18, 2025
    Inventors: Krishnan Thyagarajan, Krishna Thyagarajan
  • GATE-TUNABLE ENTANGLED PHOTON PAIR GENERATION
    Publication number: 20240118586
    Abstract: An electro-optical modulating device and method that provides efficient control of the nonlinear propagation constant in an optical waveguide are featured. The electro-optical modulating device provides large wavelength tunability of the generated entangled photon pairs in real-time by using an applied external bias voltage. The electro-optical modulating device uses gate-tunable material at locations near the optical waveguide. The application of an external bias voltage creates a variable field-effect which in turn varies the optical dielectric properties of the waveguide. The result is a compact active, highly efficient wavelength-tunable integrated quantum photonic device for tunable entangled photon pair generation using an external bias voltage.
    Type: Application
    Filed: October 10, 2022
    Publication date: April 11, 2024
    Inventors: Krishnan THYAGARAJAN, Krishna THYAGARAJAN
  • OPTICAL SIGNAL TO NOISE RATIO SYSTEM
    Publication number: 20090022499
    Abstract: The present invention provides a system for improving Optical Signal to Noise Ratio “OSNR” (208) of a transmission system using non gain-flattened optical amplifiers (101) and also provide an optically amplified Dense Wavelength Division Multiplexed “DWDM” transmission system that incorporates aforesaid system and has improved channel OSNR (208).
    Type: Application
    Filed: July 16, 2008
    Publication date: January 22, 2009
    Applicant: TEJAS NETWORKS INDIA LTD.
    Inventors: Rajeev ROY, Parthasarathi PALAI, Krishna THYAGARAJAN
  • Optical signal to noise ratio system
    Publication number: 20050041978
    Abstract: The present invention provides a system for improving Optical Signal to Noise Ratio “OSNR” (208) of a transmission system using non gain-flattened optical amplifiers (101) and also provide an optically amplified Dense Wavelength Division Multiplexed “DWDM” transmission system that incorporates aforesaid system and has improved channel OSNR (208).
    Type: Application
    Filed: October 3, 2001
    Publication date: February 24, 2005
    Inventors: Rajeev Roy, Parthasarathi Palai, Krishna Thyagarajan