As part of the Allegro project, we explored how OSNR (Optical Signal-to-Noise Ratio) margins influence the architecture of regional optical networks—particularly the efficiency of light-tree structures and transponder deployment.
🔍 Key Insights:
✅ As the OSNR margin increases, regional reach is extended and light-trees cover broader areas.
✅ P2MP transponders naturally migrate towards core nodes, reducing the need for excessive P2P connections [NAP22].
✅ Multiplexing gains improve as light-trees serve multiple “horseshoes” simultaneously.
📊 In Domain A—the region with the highest average inter-node distance—we observed:
• Minimum total cost is achieved at just 200 km (2.5 spans) with a 7.5 dB OSNR margin
• This is much shorter than the maximum inter-node distances (up to 690 km), indicating light-trees do not need to span entire domains
• P2P connections vanish at this optimal point, while P2MP transponders stabilize—showing maximum multiplexing efficiency
These findings are consistent across other regional domains and traffic loads, underscoring the robustness of this approach.
📍 Conclusion: By smartly tuning OSNR margins, we can design cost-effective, scalable, and energy-efficient regional optical networks that don’t compromise on performance.
#AllegroProject #OpticalNetworks #P2MP #LightTrees #OSNR #TelecomInnovation #NetworkOptimization #PhotonicTechnologies
