Metro WDM networks: Performance comparison of slotted ring and AWG star networks

Hyo Sik Yang, Martin Herzog, Martin Maier, Martin Reisslein

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


Both wavelength-division-multiplexing (WDM) networks with a ring architecture and WDM networks with a star architecture have been extensively studied as solutions to the ever increasing amount of traffic in the metropolitan area. Studies typically focus on either the ring or the star and significant advances have been made in the protocol design and performance optimization for the WDM ring and the WDM star, respectively. However, very little is known about the relative performance comparisons of ring and star networks. In this paper, we conduct a comprehensive comparison of a state-of-the-art WDM ring network with a state-of-the-art WDM star network. In particular, we compare time-slotted WDM ring networks (both single-fiber and dual-fiber) with tunable-transmitter and fixed-receiver (TT-FR) nodes and an arrayed-waveguide grating-based single-hop star network with tunable-transmitter and tunable-receiver (TT-TR) nodes. We evaluate mean aggregate throughput, relative packet loss, and mean delay by means of simulation for Bernoulli and self-similar traffic models for unicast traffic with uniform and hot-spot traffic matrices, as well as for multicast traffic. Our results quantify the fundamental performance characteristics of ring networks versus star networks and vice versa, as well as their respective performance limiting bottlenecks and, thus, provide guidance for directing future research efforts.

Original languageEnglish (US)
Pages (from-to)1460-1473
Number of pages14
JournalIEEE Journal on Selected Areas in Communications
Issue number8
StatePublished - Oct 2004


  • Arrayed-waveguide grating
  • Multicast
  • Ring network
  • Star network
  • Throughput-delay performance
  • Wavelength division multiplexing

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering


Dive into the research topics of 'Metro WDM networks: Performance comparison of slotted ring and AWG star networks'. Together they form a unique fingerprint.

Cite this