DWDMOTN

DWDMOTN, short for Dense Wavelength Division Multiplexing Optical Transport Network, is a descriptive term used to refer to the integration of DWDM and Optical Transport Network technologies in a single transport architecture. It envisions carrying OTUk signals over multiple DWDM wavelengths, combining the high capacity of DWDM with the framing, multiplexing, protection, and management features of OTN.

In a DWDMOTN, each DWDM channel carries optically transported payloads that are encapsulated and mapped according to OTN standards. Client signals are mapped into ODUk containers, which are then transported over DWDM wavelengths with OTN overhead for framing, error correction, and management. Network elements such as transponders, muxponders, ROADMs, and OTN/optical switches interwork to perform wavelength-level routing and cross-connect, while FEC, OAM, and impairment monitoring support reliability and operational visibility. The architecture supports both optical and hybrid electrical–optical switching, enabling flexible grooming and protection strategies.

Key features include scalable capacity through wavelength multiplexing, forward error correction for improved bit-error rates, standardized framing and overhead for network management, and enhanced protection and restoration capabilities. DWDMOTN aims to provide end-to-end service continuity with interoperability across vendor equipment by aligning with ITU-T standards governing OTN framing (OTUk/ODUk) and DWDM channelization.

Standards and deployment: DWDMOTN is not an official standalone standard. In practice, operators implement the approach by combining DWDM transport with OTN framing and switching in line with ITU-T specifications for OTU/ODU, DWDM channel plans, and network management. This approach is common in long-haul and metro networks requiring high capacity, reliability, and unified management.

See also: DWDM, OTN, ROADMs, ITU-T standards, optical transport networking.