What's the difference between DWDM and CWDM?
The primary difference between DWDM and CWDM is the channel spacing (CWDM has almost 100 times wider channel spacing) and the required frequency stability. Due to wider CWDM channels, the number of channels (lambdas) available on the same link is significantly reduced, but the optical interface components do not have to be as precise as DWDM components. CWDM equipment is thus significantly cheaper than DWDM equipment.
Please note that relaxed frequency stability might preclude the use of optical amplifiers, limiting the total CWDM optical span to tens of kilometers.
Dig Deeper on Telecom Resources
Related Q&A from Ivan Pepelnjak
Telecom networking expert Ivan Pepelnjak breaks down the speed, bandwidth and security benefits of moving from a simple cable Internet connection to ...continue reading
Telecom networking expert Ivan Pepelnjak gives us a peek under the hood at what network technologies service providers use when designing cloud ...continue reading
Telecom networking expert Ivan Pepelnjak details the similarities and differences between Infrastructure as a Service (IaaS) and multi-tenant ...continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.