DWDM(Dense Wavelength Division Multiplexer) technology refers to WDM technology with a small interval between adjacent wavelengths, and the working wavelength is located in the 1550nm window. It can carry 8~160 wavelengths on one fiber. Mainly long-distance transmission system. Opelink DWDM modules types of packaging: ABS Pigtailed Box, RackMount and LGX Cassette.