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What s Next for Optical Networking

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What s Next for Optical Networking

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    1. What’s Next for Optical Networking OFC Market Watch March 10th 2011 Los Angeles, CA

    2. Agenda “What’s next”, not “what we’ve done” (Andrew Schmitt) Next Generation ROADM Architecture Flexible Bandwidth Grid Concept Future Bit Rate Options Summary

    3. Industry First 100G Deployment

    4. What’s Next?

    5. Basic ROADM Structure Architecture: 4-Degree ROADM with colored add/drop Wavelength switching to route wavelengths between fiber directions Fixed wavelength multiplexer in add/drop structure Used for P-OTP metropolitan networks Pros: 100% channel add/drop supported for each direction Cons: Each add/drop port has fixed color Separate add/drop structure for each direction Transponder color and fiber direction hardwired when connected to a particular add/drop port

    6. Architecture: 4-Degree ROADM with colorless add/drop Wavelength switching to route wavelengths between fiber directions Tunable wavelength selection in add/drop structure Pros: 100% channel add/drop support for each direction Each add/drop port can be assigned any color Cons: Separate add/drop structure for each direction Transponder fiber direction hardwired when connected to particular add/drop direction Each add/drop structure cannot have transponders with the same wavelength Colorless Architecture

    7. Architecture: 4-Degree ROADM with colorless and directionless add/drop Wavelength switching to route wavelengths between fiber directions Add/Drop wavelength routing Tunable wavelength selection in add/drop structure Pros: 100% channel add/drop support for each direction Each add/drop port can be assigned any color Add/drop wavelength can be routed to any direction Cons: Each add/drop structure cannot have multiple transponders with same wavelength Colorless & Directionless Architecture

    8. Architecture: 4-Degree ROADM with unrestricted add/drop Wavelength switching to route wavelengths between fiber directions Add/drop wavelength routing Tunable wavelength selection in add/drop structure Pros: Any add/drop port can go any direction with any wavelength Each add/drop port can be assigned any color Add/drop wavelength can be routed to any direction No restrictions on color re-use in add/drop structure Cons: Most complex implementation Colorless, Directionless, & Contentionless

    9. Current generation WDM systems supported 10G, 40G and now 100G in service upgrades Future systems will be expected to support in service upgrades to at least 1T / channel Given the current view, more bandwidth is the only way to achieve this w/o paying a significant reach penalty due to OSNR requirements Flexible Bandwidth Grid

    10. Fully Flexible Layer 1 Network Colorless/Directionless/Contentionless ROADM node with flexible grid Colorless wavelength add/drop with directional routing Choose the bandwidth of the light path to match the service bitrate Use multiple copies of the same color wavelength on the add/drop structure

    11. Summary Flexible bandwidth grid architectures are required for upgradability Colorless, directionless & contentionless are required for flexibility Integration is required to improve cost and network reliability However – the jury is still out on what comes after 100G (imho) Good news is we don’t need to (and probably shouldn’t) decide today Spectral efficiency, cost savings and performance are the real drivers

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