Smart 1500S 400G/600G/800G DWDM System is an integrated WDM transmission platform, which meets the application scenarios of 8*100G service 0~120KM point-to-point transmission without middle repeater stations, adopts PAM4 DWDM transmission technology, supports automatic adjustment of line side dispersion, OLP protection, out-of-band OSC management and stack expansion; the appearance conforms to the network switch form, suitable for customers in the data industry, reducing the difficulty of system fiber connection, and facilitating service opening and daily maintenance.