DWDM (Dense Wavelength Division Multiplexing) is a technology that enables multiple optical signals to be transmitted over a single fiber. It works by assigning different wavelengths of light to each signal, allowing them to be transmitted simultaneously over the same fiber. This increases the capacity of the fiber, allowing more data to be transmitted over it. SFP+ (Small Form-factor Pluggable Plus) is a type of transceiver used to connect network devices to fiber optic cables. It is a compact, hot-swappable device that plugs into a network port and supports data rates of up to 10 Gbps. When used in combination with DWDM, SFP+ can provide a high-speed, reliable connection for data transmission over long distances.