Low-Cost Hybrid ROADM Architectures for Scalable C/DWDM Metro Networks

Md Nooruzzaman, Elbiaze Halima

Research output: Contribution to journalJournal articleResearchpeer-review


CWDM networks have proven to be a promising first-step metro and access network architecture, offering a significant cost advantage over DWDM due to the lower cost of lasers and the filters used in CWDM modules. If demand grows beyond the capacity covered by CWDM channels, DWDM network elements can be introduced to merge CWDM and DWDM traffic at the optical layer. This ensures two advantages: reduced initial investment and scalability for deploying DWDM channels in the future. This article presents various ROADM architectures, and explores the novel optical node architecture of hybrid C/DWDM networks, consisting of CWDM, hybrid C/DWDM, and junction nodes connecting two rings. Evaluation has shown that the hybrid ROADM architecture is superior to other conventional ROADM architectures in terms of scalability and the initial cost of optical nodes and networks.
Original languageEnglish
JournalI E E E Communications Magazine
Issue number8
Pages (from-to)153-161
Number of pages9
Publication statusPublished - 2016


  • Computer Science Applications
  • Computer Networks and Communications
  • Electrical and Electronic Engineering
  • Costs
  • Scalability
  • Cost advantages
  • CWDM networks
  • DWDM networks
  • Initial costs
  • Metro and access networks
  • Metro networks
  • Node architectures
  • Optical layers
  • Network architecture
  • wavelength division multiplexing
  • optical fibre subscriber loops
  • telecommunication channels
  • optical networks
  • hybrid ROADM architectures
  • scalable C/DWDM metro networks
  • access network architecture
  • CWDM channels
  • DWDM traffic
  • CWDM traffic
  • DWDM channels
  • ROADM architectures
  • hybrid C/DWDM
  • optical nodes
  • Wavelength division multiplexing
  • Passive optical networks
  • Optical switches
  • Optical add-drop multiplexers
  • Optical network units
  • Computer architecture
  • Cost benefit analysis
  • Multiplexing and switching in optical communication
  • Optical fibre networks

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