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Comprehensive Metro Network Design Procedure: Evaluation and Optimization Techniques

This document outlines a detailed procedure for metro network design, focusing on both inner and outer evaluations. It covers critical aspects such as network topology, traffic demand, and performance requirements. The process involves identifying critical paths through OSNR mapping, evaluating node matrices for light paths, and ensuring optimal dispersion and power maps. Additionally, it addresses the predefinition and updating of network parameters, such as data rates and channel counts, to meet the defined performance standards. This procedure aims to optimize network efficiency and reliability.

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Comprehensive Metro Network Design Procedure: Evaluation and Optimization Techniques

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  1. Metro Network Design Procedure Herbert Haunstein, Bernd Bollenz

  2. Inner Procedure Metro Network Design - Outer Evaluate - network topology - traffic demand - performance requirements It is assumed here, that the process is performed on a given network topology, i.e., given node locations, node spacing (incl. link loss, dispersion) Network segment specific, e.g., for the metro segment with various link loss parameters we assume to use a draft OSNR map to identify the critical paths. In general: critical path identification (5 disjoint shortest paths) is performed by setting the max. path length/OSNR so that 90% of all paths are covered. Evaluate node matrix to identify critical light paths:- longest / shortest path- maximum / minimum node count Predefine & update network parameters- data rate / channel count (depends on traffic demand)- FEC present(depends on distances / constraints, e.g. remove DCM ) For complex network segments the evaluation of all light paths might not be feasible Evaluate network performance(all possible / selected paths) Performance requirements fulfilled? No Yes Network design rules(e.g. modulation format, amplifier spacing, dispersion map, power map)

  3. From outer procedure To outer procedure Metro Network Design - Inner • Define & update set of components • EDFA • - Node design (OADM, equalization, …)- modulation format Set dispersion map Optimum dispersion map achieved? No Yes Set power map OSNR map- type of amplifier, amp. spacing Optimum power map achieved (OSNR maximised vs.non-linearities) No Yes Licht path requirements fulfilled?(Q factor) No Yes

  4. Evaluate - network topology - traffic demand - performance requirements • Define & update set of components • EDFA • - Node design (OADM, equalization, …)- modulation format Evaluate node matrix to identify critical light paths:- longest / shortest path- maximum / minimum node count Set dispersion map Predefine & update network parameters- data rate / channel count (depends on traffic demand)- FEC present(depends on distances / constraints, e.g. remove DCM ) Optimum dispersion map achieved? No Yes Set power map OSNR map- type of amplifier, amp. spacing Inner Procedure Optimum power map achieved (OSNR maximised vs.non-linearities) Evaluate network performance(all possible / selected paths) No Performance requirements fulfilled? Yes No Licht path requirements fulfilled?(Q factor) No Yes Network design rules(e.g. modulation format, amplifier spacing, dispersion map, power map) Yes Metro Network Design – Complete Picture

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