The optical transport network (OTN) is a technology used to implement the Internet backbone network. This is the core long haul fiber optical network that connects the world together.
OTN integrates functions of transporting, multiplexing, routing, management, and supervision, and it establishes OTN client connection (e.g., SONET/SDH, IP, ATM) in metro and Core networks. Nowadays, it is widely deployed in metro, regional, and long-haul DWDM packet-optical transport networks.
The primary benefits of the OTN network are presented as follows:
Standard Hierarchy—OTN standards define a standardized multiplexing hierarchy, specifying precisely how the lower-rate signals are mapped into the higher-rate payloads.
Transport Capacity Expansion—OTN networks enable operators to utilized the minimal network infrastructure while delivering high-quality services, providing high-capacity infrastructure for LAN and broadband access networks.
Reduced Cost—By transporting multiple clients on a single wavelength while preserving their specific requirements, the OTN network reduces overall transport costs and ensures efficient bandwidth utilization.
Timing Transparency—Timing transparency is critical for delivering wholesale services to third-party providers. The inherent transparency of OTN allows networks to transport any service-Ethernet, storage, digital video, and SONET/SDH-without disrupting client timing.
WDM MUX/DEMUX, optical add/drop multiplexer (OADM), EDFA, WDM transponder/muxponder, optical line protection (OLP) card, and variable optical attenuator (VOA) are key components used in OTN networks. The equipment deployed in an OTN network can vary depending on the specific requirements of each network task.
