Patents Examined by Andrea J. Telesz, Jr.
  • Optical wavelength-multiplexing and/or demultiplexing device
    Patent number: 4748614
    Abstract: The invention relates to an optical wavelength multiplexing and/or demultiplexing device. The device comprises a digital phase grating having at least four steps. The grating diffracts light of at least three different wavelengths in different central diffraction orders. Since the grating period may be high in comparison with the wavelengths light-emitting diodes may be used as light sources.
    Type: Grant
    Filed: April 11, 1983
    Date of Patent: May 31, 1988
    Assignee: U.S. Philips Corporation
    Inventors: Hans Dammann, Ulrich Killat, Gert Rabe