Patents by Inventor Ashish M. Vengsarker

Ashish M. Vengsarker 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).

  • Remote sensing in optical fiber networks by synchronously detecting backscattered optical signals
    Patent number: 5384635
    Abstract: The occurrence and location of a disturbance in the vicinity of a localized portion of an optical fiber are determined based on the recognition that such a disturbance changes the polarization condition of signals backscattered from the disturbed portion. Thus, multiple consistently polarized optical pulses are applied to an input end of the fiber and only signals of a particular polarization that are backscattered from the disturbed portion are abstracted from the input end. An output signal indicative of the disturbance is generated by processing these backscattered signals in accordance with synchronous detection techniques.
    Type: Grant
    Filed: August 10, 1993
    Date of Patent: January 24, 1995
    Assignee: AT&T Corp.
    Inventors: Leonard G. Cohen, Adolph H. Moesle, Jr., Ashish M. Vengsarker