Optical fiber converter retaining different sized ferrules

An optical fiber converter adapted to interconnect a first optical fiber connector and a second optical fiber connector, each of a different type, comprising:

• a ferrule subassembly comprising a first ferrule having a first central hole extending therethrough, a second ferrule having a second central hole extending therethrough, a ferrule holder, and an optical fiber, wherein the first and second ferrules have different outer diameters, a first end of the first ferrule and a first end of the second ferrule are held by the ferrule holder, a tapered surface is defined on one of the first ends of the first and second ferrules, the tapered surface is in communication with the corresponding central hole, the first central hole and the second central hole are coaxially aligned, and the optical fiber is retained in the first and second central holes;
• a sleeve coaxially retaining the second ferrule for engaging with the second optical fiber connector;
• a plug housing comprising an outer housing and an inner housing surrounded by the outer housing, the outer housing slideably engaging with the inner housing, the inner housing retaining the ferrule holder therein, the plug housing being for engaging with the first optical fiber connector;
• and
• a receptacle housing fixed with the plug housing, comprising a second opening for receiving the second optical fiber connector, a tubular portion having a hole therethrough for receiving the sleeve and the second, ferrule, and a spring-receiving cavity, the hole being in communication with the second opening and with the spring-receiving cavity;
• and
• a spring surrounding the ferrule holder and located in the spring-receiving cavity of the receptacle, and urging the ferrule holder forward into the inner housing.