Finisar has a complete product portfolio of 4Gbit/s transceivers, including the 4Gbit/s SFP (FTRJ8524P2xNy), which began shipping in July 2004, and the 4G lead-free/RoHS compliant SFP (FTLF8524P2xNy) and 4G lead-free/RoHS compliant SFF (FTLF8524E2xNy), which began shipping in November 2004.