Simple Self-Optimization of WDM Networks based on Probabilistic Constellation Shaping

With the advent of novel Elastic Optical Transponders allowing for fine rate granularity, networks designers have the opportunity to maximize the capacity of current installed and future fiber infrastructures. In this sense, capacity can be properly optimized for each network connection, while bypassing unnecessary buffers of margins. Such a connection mode of operation should rely on a simple mechanism. This paper illustrates how a SNR-driven self-optimization of optical connections is relevant for elastic WDM networks, especially when associated with Probabilistic Constellation Shaping allowing rate tunability while maximizing spectral efficiency. In addition, a novel network study is presented to quantify the savings brought by this self-optimization in terms transponder equipment for a WDM terrestrial North American backbone network, as compared to its conventional planning usually relying upon "end of life" assumptions