The DWDM AAWG is a completely passive DWDM solution based on PLC technology, which does not need addtional power supply or temperature control. Compared with the traditional DWDM , AAWG has the advantages of high integration, good uniformity, low PMD, and low insertion loss. A variety of channels and expansion ports can be provided for customers to choose. Due to the multi-channel characteristics of DWDM AAWG, it is widely used in long distance signal transmission such as metropolitan area networks, backbone networks, and data centers.