Photonic Integration: A Key Enabler for Reconfigurable Digital Optical Networks

Serge MelleVP, Technical Marketing Infinera

smelle@infinera.com

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ROADM BenefitsAny wavelength at any nodeSimplify engineering and deployment compared to fixed OADMRemote provisioning and reconfigurationEliminate truck rolls to intermediate sitesReduce cost through OEO elimination end-end wavelength networkingThe underlying premise: less electronics + more optics = lower costBut

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Wavelength Blocking in ROADM Networks32-40 l WDMAllocate bandwidth on ROADM ring using available lsExtending ROADM consumes ls end-end across networkBlocking consumes extra ls or requires OEO for l conversion..or creates stranded bandwidth and faster capacity exhaustThis does not scale with.Protection; Hundreds of demands; Larger networks; Nodal connectivity

*Note that animations 13 and after are just automated

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Sub-Wavelength Traffic in ROADM NetworksTypically many sub-l end-end demands: GbE or OC-48/STM-16Use Muxponders to aggregate 8-10 x 1G or 4 x 2.5G per wavelengthCreates many point-point connections and complex planningNew demands either strand bandwidth, or consume extra wavelengthsDifferent muxponders for 1G and 2.5G compound complexity

New A-Z demandOption 1:New end-end l and muxponders Inefficient wavelength fillStranded capacity & faster capacity exhaust

Option 2:Use existing ls and muxpondersAdded cost from extra interfacesManual inter-connects at back-back sites require truck rolls and extra OpEx

1G1G8 x 1G

*Note that animations 13 and after are just automated

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Lets Step Back: Benefits of Electronics in Optical NetworksReach ImprovementG.709 standard defines 6dB gain FEC (Reed-Solomon) High-gain FEC provides optical gain of 8dB to 9dBCorrects BER of 10-3 to BER of 10-17Cost per chip: 10s to 100s of

Dispersion CompensationFFE and DFE can compensate upwards of 1000ps/nmMLSE can correct upwards of 3000ps/nm dispersionSignificant space savings vs. DCFCost per device: 10s of

PM and OperationsOTH and SONET/SDH OverheadExtensive digital PM at all OEO nodesJ0/B1, BIP-8FEC bit error rate monitoringCommunication channels for OAM&PSONET/SDH DCC and OTH TCM

Reconfigurable SwitchingWide choice of switching/grooming granularity (VC-4, ODU-1, packet)Fundamental to managing and grooming customer services Highest level of reconfigurabilityCost per chip: 10s to 100s of

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Relative Costs of OEO The O vs. the EHigh cost of OEO conversion compared to the cost for manipulating the dataImplementing feature-rich network & service functionality incurs a cost premiumSilicon cost is not the problem

it is the conversion cost from Optical to ElectronicRelative Costs per 10G

Accessing the DataManipulating the Data

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Why are OEOs Expensive? Discrete Optics

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100Gb/s Transmit100Gb/s ReceiveInfineras Photonic Integrated Circuit Innovation5mm

DIRECT BENEFITS: Reduce size, power, cost and improve reliability STRATEGIC BENEFITS: Low-cost OEO conversion re-enables digital networking Result: Lower CapEx, lower OpEx, more flexible reconfigurable optical network

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Photonic Integration Enables a Digital ROADMUse (analog) photonics for what it does best: transmissionUse (digital) electronics for everything else more functionality / lower costConsistent with other network elements: SONET/SDH, switches, routers

Digital Electronics& SoftwareSignal regenerationError correctionPerformance monitoringSub-l add/dropSub-l Grooming & switching Multi-Service MultiplexingProtectionIntegrated PhotonicsIntegrated Photonicsoptical (analog)electrical (digital)optical (analog)

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Infinera DTN: First PIC-based Digital ROADM100G per line cardDigital ROADM WDM systemDistributed electronic OTU1 switch fabricSONET/SDH, Wave and Ethernet-based add/dropEnd-end GMPLS control planeBroadly deployed since 2004

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Reconfigurable Digital Add/DropSwitched WDM with sub-l grooming at all nodes Removes wavelength blocking constraints any point to any pointMaximizes WDM capacity on every link - no stranded bandwidthSwitched WDM eliminates back-to-back transponder connectionsMix and match of 1G, 2.5G, 10G and 40G services on any wavelengthScales with network capacity, number of nodes, network size/distance

N x 100G WDMN x 100G WDMN x 100G WDMN x 100G WDM

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Digital ROADM Service Provisioning & EngineeringFull Digital OAM&P at each Digital NodeOptical link and impairments management isolated between nodes Optical service layer independent of optical transmission layerEliminates all constraints on end-end service pathEnhance access to PM and OAM&P data at all nodesSimplify network planning, system engineering and service turn-up

DigitalNodeDigitalNodeDigitalNodeDigitalNodeDigitalNodeA Z ServiceDemand4R OEO-based managementOptical link management isolated between nodesDigital Link

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GMPLS-Enabled Networking at Every Node

GMPLS restoration capability in the transport layer with sub-l circuit granularityGMPLS-enabled end-end auto- provisioning between all nodesFiber CutGMPLS auto- discovery of circuit & physical topology of network & servicesUNI signaling for IP-optical inter-networkingUNI

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Architecture Impacts of Digital ROADMsUnconstrained reconfigurability at every nodeSub-l granularity for grooming, switching and add/dropConsolidate DWDM transport & switching in coreTopology/distance-independent service activationSupport linear, ring and mesh topologiesIntegrated sub-l protection & restorationEnd-end GMPLS control plane enables service automationExtensive digital PMs and diagnosticsRobust digital protection

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Integration: Heart of a New Strategy

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Thank You

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*Note that animations 13 and after are just automated*Note that animations 13 and after are just automated*

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