Repeaterless DWDM – A 317km Caribbean Festoon Segment Upgrade with Terrestrial MSTP

1. Repeaterless DWDM – A 317km Caribbean Festoon Segment Upgrade with Terrestrial MSTP Emanuel Nachum Vice President, Americas Marketing CANTO 2007 TRACK A Flamboyant South Wednesday 27 June 2007Connecting the Caribbean 1:00 - 2:15

2. Outline • Optical technology evolution • 317KM festoon segment upgrade • Using All-Range system • Expanding services with Multi-Degree Optics

3. Evolution of Wavelength Function • Legacy WDM - Fiber Relief Solution • Connection-oriented PSTN services • Simple, predictable traffic • SONET (and ATM, FR) used as provisionable transport Services Provisionable Transport Fiber Plant

4. Evolution of Wavelength Function • Legacy WDM - Fiber Relief Solution • Connection-oriented PSTN services • Simple, predictable traffic • SONET (and ATM, FR) used as provisionable transport • Reconfigurable WDM – High Order Managed Transport • Services become more dynamic (IP migration) • Service bandwidth grows – IP Video • OTN (G.709) provides OA&M for wavelengths Services Ethernet Provisionable Transport WDM (Virtual Fiber) ROADM Fiber Plant

5. Optical Technology Trends Reconfigurable metro/regional networks driving more power and distance ROADM is key enabler of IP video applications Power and distance used for other long haul applications

6. Unrepeatered Submarine Systems • The Caribbean has more than 1/3rd of the world’s installed festoon route-miles (including ARCOS-1) • Fiber count gap between existing and new cable systems widened greatly over last 5 years • Much cheaper to operate and maintain unrepeatered festoon – O&M key factors today Upgrade existing undersea festoon and inter-island cable systems

7. 317 KM Festoon Segment Upgrade • Antillas-1 between Punta Cana and Isla Verde • Currently operating at STM-16 (2.5 Gb/s per pair) • Field trial to determine how to implement DWDM • Part of the proposed Trans-Caribbean Cable Network (TCCN) Tested link between Dominican Republic andPuerto Rico

8. Original Signal Propagation Rotated Signal Propagation Erbium Doped Fiber Erbium Doped Fiber 30Km G.653 220Km G.654 67Km G.654 67Km G.654 220Km G.654 30Km G.653 Single-Channel Fiber Adapted to DWDM • Low-dispersion G.653 (Z-fiber) at beginning of span with high launch power would induce strong four-wave mixing • “Logically rotating” the link enables DWDM since receive power is too low to cause nonlinear degradation

9. In-line amps All Range™ Optics – One Platform • NG DWDM Technologies • 10-degree ROADM • Enhanced power control • Wavelength management Inter-metro spans up to 2000km w/o OEO • Extended Reach • E-FEC • Dual stage ROADM EDFA • Low-cost regional RAMAN CWDM interworking Metro ROADM/DWDM Networks • Packet Optical Convergence • Carrier Ethernet / MPLS • Legacy protocols • Optical or electrical switching Unrepeatered single spans over 300km

10. Rotated Signal Propagation EDFA Pre-amp EDFA Booster Erbium Doped Fiber Backward Raman Forward Raman(and ROPA pump*) 67Km G.654 220Km G.654 30Km G.653 Using All Range™ Terrestrial DWDM EDFA booster and pre-amp combined with forward and backward Raman pumping One system for undersea transport plus metro aggregation and service delivery Commonality reduces equipment cost, inventory, and operator learning curve *ROPA becomes transparent with high signal power

11. Antillas-1 Segment Upgrade Benefits • Eightfold increase of system bandwidth • Use of cost-effective terrestrial DWDM platform • Integrated multi-degree ROADM, Next-Gen SONET/SDH and MEF-certified Ethernet/MPLS switch for NGN service delivery • Future DWDM enhancements can further increase capacity without modifying the cable system G.654 + passive EDF + G.653 Dominican Republic Puerto Rico 317 Km

12. o p n q m r v n m t u s n 1   1 m   n Multi-Degree Attribute WSS ROADM Ten Degrees OADM Two Degrees Mux / Demux One Degree

13. Site y Site a Access Ring Subtend Ring Site b Site x This is hard work! Fixed Filter Provisioning Site 1 • Provisioning a new channel from Site y to Site 2 • Optical budget is affected on several spans • Truck rolls required at hub sites (mux/dmx) and endpoints to install transponders – even with APC Site 2 Site 4 Backbone Ring Site 3

14. Site y Remote command Site a Access Ring Subtend Ring Site b Site x Hey, this is easy! See? Multi-Degree ROADM Provisioning Site 1 • Provisioning a new channel from Site y to Site 2 • Minimal impact to optical budget – instantly adjusted • Brief visits only at endpoints to install port cards – no tuning, cross patching, amp/regen install, or revisits • Sites may be pre-provisioned and lit up later remotely Site 2 Site 4 Backbone Ring Site 3

15. 10-Degree ROADM – More Efficient Networking Core Ring 10 Subnetwork 10 Subnetwork 10 Add / Drop Traditional DWDM Multi-Degree ROADM Versus 3 Shelves 1 Shelf 10 Transponders 50 Transponders 42 Fiber Cables 32 Fiber Cables

16. Broadband Services Down Island • Onshore optical networks quickly growing into multi-service ROADM applications • Broadband Wi-Fi/Wi-Nax, Mobility, Multi-service backhaul, etc. • Network infrastructure that can dynamically adapt to changing subscriber demands: • Reduces OpEx and CapEx while delivering Ethernet-based, on-demand services • Quick and easy modifications of optical network designs as demands change • Eliminate the need for traffic pre-planning and forecasting • Eliminate the need for truck rolls • Support complex topologies such as multi-ring and mesh with any to any connectivity and no back to back systems

17. Site y Site a Access Ring Subtended Festoon Site b Site x Multi-Degree ROADM Flexibility • Provides rapid turn up of new wavelengths and sites • Allows efficient creation of access/subtended WDM rings off backbone network w/ ALL-OPTICAL signals • Does not require back to back DWDM nodes Site 1 Site 2 Site 4 Island Backbone Ring Site 3

18. NG-SONETSwitch EthernetSwitch Tunable MuxPonders Multi Degree Optical Networking Multi-degree convergence of packet + optical and “dry” metro flexibility + “wet” long haul reach 10-Degree All Range™ ROADM Metro/Regional Long Haul MEF Certified 80 Channels 2,000KM Beyond ROADM: Multi-Degree Packet–Optical Convergence

19. Summary – Upgrade Existing Festoon • Avoid expense of installing new cable system for more capacity • Retain economical operation & maintenance of unrepeatered festoon • Lower costs – substitute traditional undersea DWDM with all-range terrestrial DWDM • One Multi-Service DWDM system for onshore service delivery and offshore transport

20. Thank You emanuel.nachum@ecitele.com