Patents Assigned to Macro-Vision Communications, LLC
  • Patent number: 5694233
    Abstract: A switchable wavelength router has a first birefringent element that decomposes and spatially separates an incoming WDM optical signal into two orthogonally-polarized beams. A first polarization rotator selectably rotates the polarization of one of the beams to match the polarization of other beam, based on an external control signal. A wavelength filter (e.g., stacked waveplates) provides a polarization-dependent optical transmission function such that the first beam decomposes into third and fourth orthogonal beams, and the second beam decomposes into fifth and sixth orthogonal beams. The third and fifth beams carry a first spectral band at a first polarization and the fourth and sixth beams carry a second spectral band at an orthogonal polarization. A second birefringent element spatially separates these four beams into four horizontally polarized and vertically polarized components.
    Type: Grant
    Filed: January 8, 1997
    Date of Patent: December 2, 1997
    Assignee: Macro-Vision Communications, LLC
    Inventors: Kuang-Yi Wu, Jian-Yu Liu