Repeaterless DWDM – A 317km Caribbean
Festoon Segment Upgrade with
Terrestrial MSTPCANTO 2007
TRACK A Flamboyant South
Wednesday 27 June 2007Connecting the Caribbean 1:00 - 2:15
Emanuel Nachum
Vice President, Americas Marketing
Outline
Optical technology evolution
317KM festoon segment upgrade
Using All-Range system
Expanding services with Multi-Degree Optics
Fiber Plant
Evolution of Wavelength Function
Provisionable TransportServices
Legacy WDM - Fiber Relief SolutionConnection-oriented PSTN servicesSimple, predictable trafficSONET (and ATM, FR) used as provisionable transport
Fiber PlantROADMEthernet
WDM (Virtual Fiber)
Evolution of Wavelength Function
Provisionable TransportServices
Legacy WDM - Fiber Relief SolutionConnection-oriented PSTN servicesSimple, predictable trafficSONET (and ATM, FR) used as provisionable transport
Reconfigurable WDM – High Order Managed TransportServices become more dynamic (IP migration)Service bandwidth grows – IP VideoOTN (G.709) provides OA&M for wavelengths
ROADM is key enabler of
IP video applications
Optical Technology Trends
Reconfigurable metro/regional
networks driving more power and
distance
Power and distance used for other long haul applications
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
317 KM Festoon Segment Upgrade
Antillas-1 between Punta Cana and Isla VerdeCurrently operating at STM-16 (2.5 Gb/s per pair)Field trial to determine how to implement DWDMPart of the proposed Trans-Caribbean Cable Network (TCCN)
Tested link between
Dominican Republic
andPuerto Rico
Single-Channel Fiber Adapted to DWDM
30KmG.653
220KmG.654
67KmG.654
Erbium Doped Fiber
Original Signal Propagation
67KmG.654
220KmG.654
30KmG.653
Erbium Doped Fiber
Rotated Signal Propagation
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
Unrepeatered single spans over 300km
Inter-metro spans up to 2000km w/o OEO
CWDM interworking
In-line amps
MetroROADM/DWDM
Networks
All Range™ Optics – One Platform
Packet Optical Convergence• Carrier Ethernet / MPLS • Legacy protocols• Optical or electrical switching
Extended Reach• E-FEC• Dual stage ROADM EDFA• Low-cost regional RAMAN
NG DWDM Technologies• 10-degree ROADM• Enhanced power control• Wavelength management
Using All Range™ Terrestrial DWDM
67KmG.654
220KmG.654
30KmG.653
Erbium Doped Fiber
Rotated Signal Propagation
Backward RamanForward Raman(and ROPA pump*)
EDFA Booster EDFA Pre-amp
EDFA booster and pre-amp combined with forward and backward Raman pumpingOne system for undersea transport plus metro aggregation and service deliveryCommonality reduces equipment cost, inventory, and operator learning curve
*ROPA becomes transparent with high signal power
Dominican Dominican RepublicRepublic
Puerto RicoPuerto Rico
317 Km
Antillas-1 Segment Upgrade Benefits
Eightfold increase of system bandwidthUse of cost-effective terrestrial DWDM platformIntegrated multi-degree ROADM, Next-Gen SONET/SDH and MEF-certified Ethernet/MPLS switch for NGN service deliveryFuture DWDM enhancements can further increase capacity without modifying the cable system
G.654 + passive EDF + G.654 + passive EDF + G.653G.653
Multi-Degree Attribute
m1
n
Mux / DemuxOne Degree
n
1 n
m
OADMTwo Degrees
WSS ROADMTen Degrees
o
mn p
q
r
stu
v
Subtend Ring
Fixed Filter Provisioning
BackboneRing
AccessRing
Site 1
Site 3
Site a
Site b
Site 4
Provisioning a new channel from Site y to Site 2Optical budget is affected on several spansTruck rolls required at hub sites (mux/dmx) and endpoints to install transponders – even with APC
Site 2
Site y
Site x
This is hard work!
Subtend Ring
Multi-Degree ROADM Provisioning
BackboneRing
AccessRing
Site 1
Site 3
Site a
Site b
Site 4
Provisioning a new channel from Site y to Site 2Minimal impact to optical budget – instantly adjustedBrief visits only at endpoints to install port cards – no tuning, cross patching, amp/regen install, or revisitsSites may be pre-provisioned and lit up later remotely
Site 2
Site y
Site x
Remote command
Hey, this is easy!See?
10-Degree ROADM – More Efficient Networking
Multi-Degree ROADMTraditional DWDM
Core Ring
10 Subnetwork 10 Subnetwork
10 Add / Drop
3 Shelves
50 Transponders
42 Fiber Cables
1 Shelf
10 Transponders
32 Fiber Cables
Versus
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 servicesQuick and easy modifications of optical network designs as demands changeEliminate the need for traffic pre-planning and forecastingEliminate the need for truck rollsSupport complex topologies such as multi-ring and mesh with any to any connectivity and no back to back systems
Multi-Degree ROADM Flexibility
Provides rapid turn up of new wavelengths and sitesAllows efficient creation of access/subtended WDM rings off backbone network w/ ALL-OPTICAL signalsDoes not require back to back DWDM nodes
Subtended Festoon
Island BackboneRing
AccessRing
Site 1
Site 2
Site 3
Site a
Site b
Site x
Site y
Site 4
Multi Degree Optical Networking
Metro/Regional Long Haul10-Degree All Range ™ ROADM
MEF Certified
80 Channels 2,000KM
Beyond ROADM: Multi-Degree Packet–Optical Convergence
EthernetSwitch
Tunable MuxPonders
NG-SONETSwitch
Multi-degree convergence of packet + optical and “dry” metro flexibility + “wet” long haul reach
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
