How to choose DCM in DWDM system solution?

 How to choose DCM in DWDM system solution? How to know the compensation length for the link? How to calculate that if I use the 80km DWDM SFP+?

You can use the following method to calculate the compensation length, as a reference to select the DCM you need. The link distance minus the transmission distance of the optical module is the minimum compensation distance, on this basis need to add 20km to ensure enough compensation. 

For example, if the transmission span is 135km, the compensation length is 75km (135km - 80km + 20km = 75km), which means you can choose a DCM whose compensating length is 80km.

If have DWDM requirement, welcome to contact HTF.  support@htfuture.com   SKYPE/Whatsaspp/Wechat: +8618123672396