10G Base LR Xenpak Optical Transceiver

POFLink's Xenpak is a standardized form factor for 10 Gb/s fiber optic transponders that is used for data transfer rates from 10.3 Gb/s to 10.5 Gb/s. It is protocol-specific: Either 10G Ethernet or 10G Fibre Channel versions are available. Xenpak transponders are used in datacom optical links only (not telecom). Its electrical interface to the host board is also standardized and is called XAUI (4 x 3.125 Gb/s).

POFLink offers the whole series of 10G XENPAK, including: 
Xenpak 10G SR  300M (MMF OM3);
Xenpak 10G LR  SMF 10-20KM;
Xenpak 10G ER  SMF 40KM;
Xenpak 10G ER SMF 80KM