Presentation Information
[B-6-06]Applying Transponder Virtualization to CDC Restoration
〇Wataru Ichihara1, Someya Takumi1, Nobe Makoto1, Oku eriko1 (1. NTT, Inc.)
Keywords:
DSP,CDC restoration,ROADM
This paper proposes a cost‑efficient network design for high‑capacity optical transport networks by focusing on the evolution and utilization of digital coherent DSP technology. Recent DSP advancements have improved performance rapidly while reducing power consumption and size. In ROADM systems, CDC restoration is widely used to reroute optical paths during failures. However, restoration paths often require stricter transmission conditions than working paths, leading to lower data rates or higher costs due to additional relay equipment. To address this issue, the paper introduces a new architecture that separates DSP functions from transponder functions and virtualizes DSP resources into a shared pool. This enables not only the latest DSPs but also older or variable‑quality DSPs to be effectively reused according to distance and bit rate requirements, improving resource efficiency and enabling flexible network design. Simulations using shortest and secondary paths (CDC‑R) show that the proposed approach achieves more efficient resource allocation across various conditions and provides a cost advantage over conventional methods. Overall, the combination of DSP virtualization and CDC-R enhances flexibility and cost efficiency in large‑scale optical networks, demonstrating its effectiveness for deployment.