Patent ID: 8588572

Claim:
An electromagnetic interference (EMI) waveguide (WG) device for use in a parallel optical communications module, the EMI WG device comprising: a generally flat cover made of an electrically-conductive material, the cover having a mounting portion for mechanically coupling the cover to a metal housing of the parallel optical communications module; a tube-like structure made of an electrically-conductive material, the tube-like structure having a first end that is mechanically coupled to the cover, the tube-like structure having an effective length, L, and an effective diagonal dimension, D, and wherein D is sufficiently large to accommodate at least one optical fiber ribbon cable to enable a portion of said at least one optical fiber ribbon cable to pass through an opening in the tube-like structure that is defined by interior surfaces of the tube-like structure, wherein the opening has the diagonal dimension, D, and wherein the cover and the tube-like structure provide EMI shielding for the parallel optical communications module when the EMI WG device is installed in the metal housing; and an electrically-conductive gasket that wraps around at least a portion of the first end of the tube-like structure, the gasket being disposed to come into contact with a metal housing of the parallel optical communications module when the EMI WG device is installed in the parallel optical communications module to electrically ground the EMI WG device to the metal housing.