Patents by Inventor Rongtao Cao

Rongtao Cao 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).

  • Optical receiver photodiode testing using test optical terminal at different location than operational optical terminal
    Patent number: 12222257
    Abstract: A structure for testing a photodiode in a PIC using a grating coupler in optical communication with an optical terminal in a different location of the photodiode from another optical terminal used during operation of the PIC. The photodiode includes an operational optical terminal and a test optical terminal with the test optical terminal in a different location than the operational optical terminal. An optical component is in optical communication with the operational optical terminal of the photodiode and is used during operation of the photodiode and the PIC. A grating coupler is in optical communication with the test optical terminal of the photodiode for testing purposes.
    Type: Grant
    Filed: March 30, 2022
    Date of Patent: February 11, 2025
    Assignee: GlobalFoundries U.S. Inc.
    Inventors: Hanyi Ding, Aidong Yan, Rongtao Cao
  • OPTICAL RECEIVER PHOTODIODE TESTING USING TEST OPTICAL TERMINAL AT DIFFERENT LOCATION THAN OPERATIONAL OPTICAL TERMINAL
    Publication number: 20230314274
    Abstract: A structure for testing a photodiode in a PIC using a grating coupler in optical communication with an optical terminal in a different location of the photodiode from another optical terminal used during operation of the PIC. The photodiode includes an operational optical terminal and a test optical terminal with the test optical terminal in a different location than the operational optical terminal. An optical component is in optical communication with the operational optical terminal of the photodiode and is used during operation of the photodiode and the PIC. A grating coupler is in optical communication with the test optical terminal of the photodiode for testing purposes.
    Type: Application
    Filed: March 30, 2022
    Publication date: October 5, 2023
    Inventors: Hanyi Ding, Aidong Yan, Rongtao Cao