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ECOC 2010 Turin Italy

Next Gen ROADMs “Less” is more: Colorless, Directionless, Contentionless, Gridless Krishna Bala, Ph.D Exec VP WSS Group bala@oclaro.com. ECOC 2010 Turin Italy. Outline. Next- Gen ROADM requirements Architectural Choices Implications for WSS devices. Generations of ROADMs.

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ECOC 2010 Turin Italy

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  1. Next Gen ROADMs“Less” is more: Colorless, Directionless, Contentionless, GridlessKrishna Bala, Ph.DExec VP WSS Group bala@oclaro.com ECOC 2010 Turin Italy

  2. Outline • Next- Gen ROADM requirements • Architectural Choices • Implications for WSS devices

  3. Generations of ROADMs • 1st Gen ROADMs introduced the following features: • Re-configurability in add/drop channels • However, these nodes were restricted to 2 directions • 2nd Gen ROADMs introduced the following features: • Multi-degree capability (e.g. 4 or 8 directions per node) • However, these nodes are “colored” and “directional” • 3rd Gen ROADMs will introduce more “Mesh” features: • Significant flexibility in provisioning and restoration • Colorless, Directionless, Contentionless and “Gridless” (Flexible Spectrum actually)

  4. 2nd Gen ROADM: 8 degree example Colored and Directional Degree 2 8x1 WSS Passive splitter 8x1 WSS Degree 8 Degree 1 8x1 WSS Add/Drop AWG AWG AWG AWG AWG AWG Tx Rx Colored: Each “chassis slot” is associated with specific “laser color” Directional: Each laser is associated with a specific direction

  5. Requirements for 3rd Gen ROADMs New Features for Mesh ROADMs/WSS North In North Out East In West In ROADM Node East Out West Out Local Add ports Local Drop ports • Colorless add/drop – No blocking in wavelength assignment on any Add/Drop • Contentionless add/drop – No blocking inside ROADM due to wavelength collision • Directionless add/drop – Full flexibility in routing to any direction • Gridless - Dynamically allocate spectrum to each wavelength

  6. Requirements for 3rd Gen ROADMs New Features for Mesh ROADMs/WSS North In North Out East In West In ROADM Node East Out West Out Local Add ports Local Drop ports Of course, customers want ……. Costless  • Colorless add/drop – No blocking in wavelength assignment on any Add/Drop • Contentionless add/drop – No blocking inside ROADM due to wavelength collision • Directionless add/drop – Full flexibility in routing to any direction • Gridless - Dynamically allocate spectrum to each wavelength As a supplier, we think ………….. Priceless 

  7. 3rd Gen ROADM: 8 degree example Adding Colorless Feature: Replace AWGs Degree 2 8x1 WSS Passive splitter 8x1 WSS Degree 8 Degree 1 8x1 WSS Add/Drop AWG AWG AWG AWG AWG AWG Tx Rx Colored: Each “chassis slot” is associated with specific “laser color” Directional: Each laser is associated with a specific direction

  8. 3rd Gen ROADM: 8 degree example Colorless Degree 2 8x1 WSS Passive splitter 8x1 WSS Degree 8 Degree 1 8x1 WSS Add/Drop 1x24 WSS 1x24 WSS 1x24 WSS AWG 1x24 WSS 1x24 WSS AWG 1x24 WSS AWG AWG AWG Tx Rx Colorless: Each “chassis slot” can associate with any “laser color” Directional: Each laser is associated with a specific direction Colorless: Requires “Scalability” in WSS port count – Large port count

  9. 3rd Gen ROADM: 8 degree example ColorlessAND Directionless Degree 2 8x1 WSS Passive splitter 8x1 WSS Degree 8 Degree 1 8x1 WSS Passive splitter Add/Drop 8x1 WSS 8x1 WSS AWG 1x24 WSS AWG 1x24 WSS AWG 1x24 WSS AWG 1x24 WSS 1x24 WSS 1x24 WSS Tx

  10. 3rd Gen ROADM: 8 degree example Colorless and Directionless: But, has Contention Degree 2 8x1 WSS Passive splitter 8x1 WSS Degree 8 Degree 1 8x1 WSS Add/Drop Contention 8x1 WSS 8x1 WSS AWG 1x24 WSS AWG 1x24 WSS AWG 1x24 WSS AWG 1x24 WSS 1x24 WSS 1x24 WSS Rx Tx Rx

  11. 3rd Gen ROADM: 8 degree example Colorless, Directionless, Contentionless Degree 2 8x1 WSS Passive splitter 8x1 WSS Degree 8 Degree 1 8x1 WSS MxN WXC 24x8 or 48x8 or …. MxN WXC 8x24 or 8x48 or …. 8x1 WSS 8x1 WSS AWG 1x24 WSS AWG 1x24 WSS AWG 1x24 WSS AWG 1x24 WSS 1x24 WSS 1x24 WSS Rx Tx Rx Contentionless: Requires “Scalability” in WSS ports – Large port counts

  12. 3rd Gen ROADM: 8 degree example Colorless, Directionless, Contentionless with “Grouping” Degree 2 8x1 WSS Passive splitter 8x1 WSS Degree 8 Degree 1 8x1 WSS MxN WXC 8x8 MxN WXC 8x8 8x1 WSS 8x1 WSS 8x1 WSS AWG 1x24 WSS AWG 1x24 WSS AWG 1x24 WSS AWG 1x24 WSS 1x24 WSS 1x24 WSS Rx Tx Rx

  13. 3rd Gen ROADM: Colorless, Directionless, Contentionless and “Gridless” Example: Add BW in 25GHz steps -200 -175 -150 -125 -100 -75 -50 -25 0 25 50 75 100 125 150 175 200 • Dynamic/Flexible Spectrum Addition • Add BW in 25 Ghz steps • Allows future-proofing for higher speed transport • E.g. 400 Gb/s and 1 Tb/s • Gridless: Requires Spectrum “Flexibility” in WSS Xtellus Confidential - 13

  14. WSS Roadmap for 3rd Gen ROADMs • WSS must be SCALABLE • Large port counts • 1x24 plus ports and beyond • MxN where M=8 and N=24 and beyond • WSS must be FLEXBILE • Dynamic/Flexible Spectrum Alloction • Other “Must Haves” • Fast switching speed: Fast mesh restoration • Green: Low power dissipation

  15. Conclusion • 3rd Gen ROADMs require new features • Colorless, Directionless, Contentionless, Gridless • 3rd Gen WSS must support • Scalability in port counts • Flexibility in spectral allocation • Fast switching times • Green low-power operation

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