An optical receptacle module includes an optical module unit including therein an optical device and carrying a sleeve, a ferrule holder fitted into the sleeve and holding therein a ferrule, a frame member mounted on the ferrule holder, and an adapter unit mounted on the frame unit and accepting an external...http://www.google.com.au/patents/US6126325?utm_source=gb-gplus-sharePatent US6126325 - Receptacle module for optical telecommunication
