Different signal formats：
DWDM technology has no corresponding frame structure. In the process of operation, the wavelength of a single signal is converted into the corresponding wavelength in the network communication through the converter. Through optical technology, the transmission wavelength is multiplexed.
OTN has a complete frame mechanism, so it has the ability of access and processing, and improves the efficiency of bandwidth utilization.
Differences in networking and protection mechanisms：
The networking mode of DWDM technology is mainly point-to-point, chain, star and ring networking. In terms of protection mode, only grass-roots protection is provided. The protection mode is mainly the protection of the optical recovery section, and the protection of 1 + 1 and 1:1 is used on the optical road. The terminal equipment is not protected. This protection mode requires two optical cables routed independently. The self-healing protection of DWDM service is carried out in SDH ring network.
OTN network is usually a ring network, mesh network and other networking modes, which can provide line 1 + 1 protection, wavelength 1 + 1 protection, customer side 1 + 1 protection, ODUk protection, optical layer and electrical layer protection, etc
Business scheduling capability：
In OTN, data configuration can be used for cross connection, multiple types of services can be accessed at the same time, and intelligent scheduling of services can be realized.
Application scenario：
DWDM is mainly used in inter provincial trunk network and intra provincial backbone network, mainly in point-to-point networking mode, which can realize line protection. OTN network provides a very ideal solution for large broadband granular services. It deploys OTN network in the inter provincial backbone network, intra provincial backbone network, and metropolitan core layer of telecom operation enterprises, and provides scheduling of service particles above GB / s.
