CWDM optical module and DWDM optical module, CCWDM module which is better?

From the perspective of cost, CCWDM is cheaper than CWDM and DWDM. CWDM optical modules provide a convenient and low-cost solution for adopting Gigabit Ethernet and Fibre Channel. And CCWDM adopts the optical performance to reduce the cost, the package size is small, the high expandability is high (4/8/10 or more channels) ,It is suitable for the data communication network / telecommunication network of the low-cost uncooled laser technology. On the other hand, DWDM generally uses denser channel spacing and is used for large-scale optical networks over longer