SFP + optical module is a new generation of optical modules, according to ANSI T11 agreement, to meet the 8.5G and Ethernet Fiber Channel 10G applications. Mainly SR, LR. 10G optical module simplifies the design, power consumption and thus smaller. With high-density, low power consumption, lower system cost and other significant advantages, with DDM function, that is, digital diagnostics, enabling customers to monitor and understand the data link module working status, such as receiving optical power , The laser power, the laser bias current, the operating voltage and the temperature and other parameters of change, so as to achieve accurate, effective and economical management network based on digital diagnostic information, the effective implementation of the network monitoring. Products are widely used in 10 Gigabit Ethernet optical data communications, Gigabit module is the mainstream products.