Optical networks are high-capacity communication infrastructures that utilize light for transmission, processing, and routing of information These networks vary in terms of distance and capacity, falling into several tiers: (1) long-haul networks, such as submarine. Optical networks are high-capacity communication infrastructures that utilize light for transmission, processing, and routing of information These networks vary in terms of distance and capacity, falling into several tiers: (1) long-haul networks, such as submarine. At the heart of this ecosystem lies the Optical Transport Network (OTN) — a framework defined by the ITU-T (notably G. 709) that has become the foundation for modern optical communications. It encapsulates diverse client signals —. The paper, focused on the topology optimization design of optical transport backbone network, is to obtain the network planning topology graph with the maximum network value by the depth-first search and the minimum spanning tree. The company offers innovative solutions for the development, installation, management and. Optical backbone networks, characterized by using optical fibers as a transmission medium, constitute the fundamental infrastructure employed today by network operators to deliver services to users.