Gracyfiber DWDM AAWG (heatless arrayed waveguide grating) module is a passive module based on PLC (planar waveguide) technology, which does not require additional power or temperature control; Compared with traditional TFF (thin film filter) products, 40CH AAWG has the advantages of high integration, good uniformity, low PMD and low insertion loss. The product can provide multiple channels, packaging methods and expansion ports for customers to choose. At present, it is widely used in long-distance signal transmission such as MAN, backbone network and data center