US Patent 7217042 Optoelectronic module

An optoelectronic module having a package encapsulating an optoelectronic device, a triplicated sleeve having a lower metal ring, an intermediate insulating ring and an upper metal cover which are coupled by press-fitting in concentric disposal, and a receptacle fitted upon the upper metal cover. The optoelectronic module does not emit noise radio waves or is not subject to external noise. The module satisfies the stipulated standard that an electric field should be less than 54 dBμV/m at a 3 meter distant measuring spot in a frequency range higher than 1 GHz.