Abstract: A cannula can have a ferrule with two interspaced optical fiber passages extending therebetween, each securely housing an optical fiber therein having a first tip exposed at a connection end, and a second tip protruding from an opposite implant end by a penetration distance, and a bore extending into the ferrule from the connection end. The cannula can be removably connected by a patch cord having a ferrule with a guide pin, with a relatively high degree of optical alignment, by inserting both ferrules into corresponding ends of a sleeve and engaging the guide pin within the bore.