With the rise of 400G+ coherent technology and its adoption in open pluggable interfaces, computing path feasibility over transparent lightpaths (LPs) has become more crucial than ever—even in metro-core networks.
🔍 Key challenge? While LP performance is typically assessed based on ASE noise and nonlinear interference (NLI) using GSNR models, optical routing effects—particularly filtering degradation from cascaded WSSs in ROADMs—are often overlooked.
📡 In metro-meshed networks, shorter distances mean less ASE noise, but progressive spectral narrowing caused by WSS filtering can significantly degrade signal quality. Our research models this filtering impact within the Lightpath Computation Engine (L-PCE), ensuring more accurate feasibility assessments.
📊 Figure 5-27 illustrates a flex-grid ring topology, highlighting how a Channel Under Test (CUT) accumulates spectral narrowing as it traverses multiple nodes.
🌍 As metro-core networks scale up with increased switching sites and dynamic optical routing, addressing WSS filtering effects is key to unlocking next-gen high-capacity networks!
🔗 How do you see these filtering challenges shaping the future of metro-core network design? Let’s discuss!
#OpticalNetworking #CoherentOptics #400G #MetroCore #ROADM #FilteringEffects #Telecom #Innovation #Research
