ROAD to More network flexibility

1. ROAD to More network flexibility Jean Jennen (jeanjennen@lucent.com) Bell Labs Europe Lucent Technologies – ProprietaryUse pursuant to company instruction

2. Outline • Value proposition of ROADMs • Broadcast & select ROADM • Basic building blocks • In-service ROADM upgrades • Example link layouts • Future outlook • Conclusions • Q&A Lucent Technologies – ProprietaryUse pursuant to company instruction

3. Value proposition of ROADMs • Reconfigurable Optical Add/Drop Multiplexers offer • Add/drop of any wavelength, anywhere, anytime • Increased network efficiency • Easier operation over time • Bandwidth-on-demand • Means to easily address network provider’s capacity and flexibility needs for metro access applications • Cost reduction of planning and engineering activities over the network’s service life time • Optical bypass • Reduction of OEO converter costs by elimination of redundant receivers and transmitters Lucent Technologies – ProprietaryUse pursuant to company instruction

4. Broadcast & select ROADM DCE Dynamic Channel Equalizer, e.g. wavelength blocker OA Optical Amplifier OMON Optical Monitor OA OA DCE Set DCE to achieve desired flatness or to block add/drop channels Spectrum OMON Drop ports Add ports System software Measured channel powers Lucent Technologies – ProprietaryUse pursuant to company instruction

5. OA Optical In-Line Amplifier (ILA) End Terminal (Degree 1 ROADM) Drop ports Drop ports OA Add ports Add ports OA OA Add ports DCE Drop ports Wavelength Cross-Connect (WXC) OA OA Reconfigurable Optical Add Drop Mux (Degree 2 ROADM) DCE Basic building blocks Lucent Technologies – ProprietaryUse pursuant to company instruction

6. OA OA OA OA OA Drop ports Drop ports Drop ports Drop ports Drop ports Drop ports Drop ports OA OA OA OA OA Add ports Add ports Add ports Add ports Add ports Add ports Add ports OA OA OA OA OA OA OA Add ports Add ports Add ports Add ports Add ports DCE DCE DCE DCE DCE DCE DCE DCE DCE Drop ports Drop ports Drop ports Drop ports Drop ports DCE DCE DCE DCE OA OA OA OA OA DCE OA OA In-service ROADM upgrades Degree 1 ROADM Co-located degree 1 ROADM from independent link In-service upgrade to degree 2 ROADM Third co-located degree 1 ROADM In-service upgrade to degree 3 WXC In-service upgrade to degree 4 WXC Degree 1 ROADM Co-located degree 1 ROADM from independent link In-service upgrade to degree 2 ROADM Third co-located degree 1 ROADM In-service upgrade to degree 3 WXC In-service upgrade to degree 4 WXC Degree 1 ROADM Co-located degree 1 ROADM from independent link In-service upgrade to degree 2 ROADM Third co-located degree 1 ROADM In-service upgrade to degree 3 WXC In-service upgrade to degree 4 WXC Degree 1 ROADM Co-located degree 1 ROADM from independent link In-service upgrade to degree 2 ROADM Third co-located degree 1 ROADM In-service upgrade to degree 3 WXC In-service upgrade to degree 4 WXC Degree 1 ROADM Co-located degree 1 ROADM from independent link In-service upgrade to degree 2 ROADM Third co-located degree 1 ROADM In-service upgrade to degree 3 WXC In-service upgrade to degree 4 WXC Degree 1 ROADM Co-located degree 1 ROADM from independent link In-service upgrade to degree 2 ROADM Third co-located degree 1 ROADM In-service upgrade to degree 3 WXC In-service upgrade to degree 4 WXC Degree 1 ROADM Co-located degree 1 ROADM from independent link In-service upgrade to degree 2 ROADM Third co-located degree 1 ROADM In-service upgrade to degree 3 WXC In-service upgrade to degree 4 WXC Lucent Technologies – ProprietaryUse pursuant to company instruction

7. Example link layouts WXC Degree 2 ROADM End Terminal Degree 1 ROADM as End Terminal ILA Degree 2 ROADM Degree 4 WXC Degree 1 ROADM Degree 3 WXC WXC WXC Full Ring Full Ring WXC Degree 1 ROADM as End Terminal Lateral Extension Degree 2 ROADM WXC ROADMs part of same line system Degree 2 Minimally Equipped Mesh ROADMs WXC Degree 4 WXC WXC Lucent Technologies – ProprietaryUse pursuant to company instruction

8. Future outlook • Limitations of broadcast & select ROADMs • Relatively high through path loss due to splitters and couplers • The need for additional wavelength blockers (DCEs) for upgrades to wavelength cross-connects • Requirements for alternative solutions • Development of ROADM components that act as per wavelength reconfigurable 1x2 or 2x2 optical switches • Through path loss and power consumption of these components should not exceed half the respective values of the B&S solution Reconfigurable add/drop block Reconfigurable 2x2 switch Lucent Technologies – ProprietaryUse pursuant to company instruction drop add

9. Future outlook [continued] • Additional benefits of reduced through path loss and power consumption • The ability to build larger and more complex functions like 4x4 cross-connects • More ROADMs can be cascaded in-between repeaters • Both CAPEX and OPEX are reduced • Less power consumption directly affects OPEX • Reduced through path loss requires less amplification along the links and consequently reduces CAPEX and OPEX due to the smaller number of in-line amplifiers Lucent Technologies – ProprietaryUse pursuant to company instruction

10. Conclusions • ROADMs enhance network flexibility and efficiency • In-service upgrades offer cost-effective network planning and engineering • WXCs based on ROADM building blocks allow for different physical topologies on a per wavelength basis • New ROADM concepts are needed to build even larger WXCs while limiting power consumption and through path losses • Lower through path losses also enhance ROADM cascadability, thus further reducing the number of repeaters in the network Lucent Technologies – ProprietaryUse pursuant to company instruction

11. Q&A Lucent Technologies – ProprietaryUse pursuant to company instruction