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Internet-2 Fall Meeting Optical Panel. Tuesday September 20 th 2005 Electrical vs Optical Switching in R&E Networks. Capabilities Economics Reliability. Capabilities. Economics. The most cost effective solution is dependent on

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internet 2 fall meeting optical panel

Internet-2 Fall Meeting Optical Panel

Tuesday September 20th 2005

electrical vs optical switching in r e networks
Electrical vs Optical Switching in R&E Networks
  • Capabilities
  • Economics
  • Reliability
  • The most cost effective solution is dependent on
    • The architecture of the node (East-West / Mesh)
    • How much traffic is required to add/drop at the node
    • How much traffic is Pass-through at the node
  • OEO and OOO available in same node for most cost effective solution over network lifespan.

Example 1: All traffic is ‘available’ for add/drop at the node but

can be pass-through if necessary – assumes 10GigE traffic

OEO is more cost effective at all capacities


Example 2: Fixed capacity of 32 wavelengths – %age of traffic

available at the node is variable – Assumes 10GigE traffic

OOO more cost effective with increasing pass-through traffic


Example 3: QUILT Network Model (October 2004) : Metro 2-1 node.

Mix of 2.5G(50%) and 10G(50%) traffic. 25% pass-through traffic (10G)

OOO / OEO equally cost effective at Day-1 :OEO

becomes more attractive as more capacity is added




Electronic switching is a well proven, field deployed technology.

With increase in market volumes (2008) Optical ROADM reliability

will be on a par with electrical reliability

  • Are there performance issues related to OOO vs OEO ?
    • With OOO, the express (pass-thru) wavelengths will traverse a longer optical path, though more optical amplifiers and filters than the equivalent OEO solution so . .
      • The required OSNR for the OOO case will be higher than OEO due to the build up of non-linear impairments and a reduction in the dispersion window.
      • OOO will experience more pass-band narrowing through the cascaded optical ROADM – therefore more signal distortion effects must be managed within the link engineering.
      • OOO does however provide dynamic gain flattening and power equalization.
    • Optical amplifiers with advanced transient suppression and monitoring features are required for OOO.
    • The number of OEO nodes traversed will eventually be limited by jitter accumulation along the path.
    • If design is within link budget limitations, both will perform equally well
  • What are the advantages/disadvantages of OOO vs OEO related to monitoring ?
    • An Electronic switch fabric has access to layer 0, 1 and higher Performance Monitoring which provides for remote network troubleshooting and for fast, effective protection switching.
    • OOO has access to optical power/OSNR measurement only.
    • Electronic switching fabrics allow loop-backs to be set remotely which cuts the cost and time required for network troubleshooting – there is no equivalent in an OOO system.
  • What are the advantages/disadvantages of OOO vs OEO related to switching especially in providing dynamic capabilities ?
    • OEO is by definition non-blocking and so multi-degree ring interconnection and mesh networking are simple compared to OOO from an engineering and control perspective. Where the number of pass-through wavelengths is small, OEO provides a more cost effective solution.
    • In the cases where significant pass-through traffic is required (in east west or multi-degree networks), OOO provides a more cost effective solution than OEO.
    • For cases where the traffic is a mix of 2.5G and 10G, add/drop and pass-through at a node, the cost differential is less well defined (as was discussed re the Quilt network model !)
    • In large rings and multi-degree cases OOO requires complex path dispersion management which is fiber type dependent.
  • Which is better suited beyond 10G and what are the advantages/disadvantages of each ?
    • From a cost perspective, OOO is better suited to 40G traffic when pass-through wavelengths are required at a node.
    • For 40G pass-through, OEO would cost a minimum of 4 times that of an equivalent 10G port – switching electrically at native 40G rates is not on the development radar
    • For OOO and depending on the 40Gbps+ technology used, there will be a limit on the number of cascaded OOO hops in a chain (ring or mesh) before pass-band narrowing starts to cause significant ISI.
    • 40Gbps+ will require more strict control of dispersion in OOO systems and will have a reduced OSNR tolerance compared to 10G systems.