Patents by Inventor Joseph M. Dziedzic

Joseph M. Dziedzic 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).

  • Non-destructive optical trap for biological particles and method of doing same
    Patent number: 4893886
    Abstract: Biological particles are successfully trapped in a single-beam gradient force trap using an infrared laser. The high numerical aperture lens objective in the trap is also used for simultaneous viewing.Several modes of trapping operation are presented.
    Type: Grant
    Filed: September 17, 1987
    Date of Patent: January 16, 1990
    Assignees: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Arthur Ashkin, Joseph M. Dziedzic
  • Inline optical fiber attentuator
    Patent number: 4529262
    Abstract: An inline single-mode fiber attenuator (10) is disclosed which may be formed by a tandem combination of a birefringent polarization-preserving fiber (12) and a single polarization fiber (14). The birefringent fiber functions as a variable wave plate and the single polarization fiber functions as a fiber polarizer. By continuously changing the local birefringence of the birefringent fiber with, for example, tension, pressure, or temperature, the phase difference between the two polarization components of light traveling through the birefringent fiber is continuously modified. The difference in phase causes suppression of one of the polarization components as it enters the fiber polarizer and, therefore, the output of the fiber polarizer, the sum of the two polarizations, is attenuated. The attenuator may be tuned by changing the local birefringence of the birefringent fiber.
    Type: Grant
    Filed: May 9, 1983
    Date of Patent: July 16, 1985
    Assignee: AT&T Bell Laboratories
    Inventors: Arthur Ashkin, Joseph M. Dziedzic, Jay R. Simpson, Rogers H. Stolen