This document describes a 10G 1554.94nm 80km DWDM SFP+ transceiver. It provides specifications for the transceiver including its product description, features, optical and electrical characteristics, and pin definitions. The transceiver uses a cooled EML laser transmitter and APD receiver to support transmission distances up to 80km over single-mode fiber for applications such as 10G Ethernet and fiber channel. It complies with relevant standards and provides digital diagnostics monitoring via a serial interface.