We are seeking for some cost-effective SFP+ CWDM modules for our project to support 35km transmission. I've found that one CWDM case from FS Twitter has a similar situation with our current project. Since the network solution that they design for that case is pretty nice, I tried to consult with the AM to get some advice. The FS technical team helped us to check our link plan and even revise some details in our existing diagram, like calculating the fiber loss and confirming the modules' compatibility. Really appreciated the professional advice and considerate assistance of you guys. The modules that you recommended worked flawlessly on our switches, which are optimal for our 10G network. Thanks for your support!