The 4CH-CWDM type AWG of MUX and Demux are designed for 40/100G active optical module package,such as CFP4,CWDM4,LR4,CLR4,LAN-WDN,QSFP28. It have small package size and easy to assembly,It can be replace TFF(Thin film filter) type CWDM.As a result of cost-effective advantage and compact packaging, more and more module manufacturers use CWDM AWG to package their higher speed optical modules.