Optical Connector Element

An optical connector has a single ferrule held within a ferrule holder to make a ferrule assembly. The ferrule assembly is inserted into a connector housing with an expansion slot extending from the front end toward the back end to allow insertion of the ferrule assembly from the front of the connector housing. The ferrule holder has at least one extension extending from a outer surface thereof and a window in communication with and opening extending through the ferrule holder. The connector housing also has a window disposed in the main body, the window disposed in the main body in an outer surface adjacent the expansion slot to receive the extension from the ferrule holder.