Patent ID: 7837399

Claim:
An optical subassembly, comprising: a header assembly having one or more components configured to be connected to signal ground, the header assembly including: one or more components housed within the header assembly that generate electromagnetic interference emissions; and an optical aperture formed in the header assembly through which optical signals can be transmitted; a housing configured to be connected to chassis ground, the housing including a port and a barrel, the port defining a fiber receptacle and the barrel defining a cavity that at least partially receives the header assembly; and one or more containment structures at least partially containing the electromagnetic interference emissions within the optical subassembly, wherein the one or more containment structures comprise a metallization layer configured to be connected to chassis ground, the metallization layer substantially covering an exterior surface of the housing and an interior radial surface of the cavity, wherein: the one or more containment structures further comprise a containment disk configured to be connected to signal ground; the containment disk is attached to the header assembly and defines a containment disk aperture that is smaller than the optical aperture; the containment disk does not contact the metallization layer creating a circumferential gap between the containment disk and the metallization layer; and the circumferential gap is filled with insulating material.