10GBASE Dense Wavelength-Division Multiplexing XFP Modules it is designed for carriers and large enterprises with a scalable, flexible, cost-effective system for multiplexing, transporting high-speed data, storage, voice and video applications in point-to-point, add/drop and star network topologies. It operates at a nominal wavelength of 100GHz or 50GHz ITU Grid. Except fixed channel DWDM modules, also have Tunable DWDM XFP, which can adjust its wavelength on site to the required lambda. Tunable DWDM XFP transceivers enable us to change wavelengths unlimited within the C-band DWDM ITU Grid.