Presentation on theme: "Josep Prat Universitat Politècnica de Catalunya (UPC) Barcelona"— Presentation transcript:
1 Josep Prat Universitat Politècnica de Catalunya (UPC) Barcelona EU-Japan Workshop, Brussels 18-April Research on Next Generation Optical Access NetworksJosep PratUniversitat Politècnica de Catalunya (UPC) Barcelona
3 PON Optical spectrum possible bands for ngPON3 (with compatibility) : FSAN-ITU Estandards:?12601270128012901300131013201330134013501360G-PONupstreamXG-PON14801490150015101520153015401550156015701580159016001610G-PONdownstreamXGVideoNG21010possible bands for ngPON3(with compatibility) :40 nmVideo: IPEDFALow loss fiberHigh availability of comp.40 nm / 6.25 G = 800 channels !!CAPACITY x 100 !!
4 E/O BW & power Efficiency Statistical WDM multiplexingTime-switched phase diversity&modulation1000%EF = Rb / BWDRoFOFDMElectrical Spectrum Efficiencyud-WDM100%10%WDM/TDMGPON1%XG-PON0.1%PowerComsp.:= a C Vd2 fr + Io 10Vt/S Vdx Activity %0.01%0.1%1%10%100%Optical Spectrum Efficiency
5 PON alternatives GPON XGPON TWDM-PON cUDWDM-PON WDM-PON SCM/OFDM-PON Aggregate BW2.5/1.2510G/2.540G/10G>40GDepends on typeGood if combined with WDMGranularity(min BW/user)1 AWG port assignedN subcarriers1G-10G Good if +TDMComplexity, costTunable TRX ONUsUp-stream or tunable laserUpstream, PAPR, optical amplif. or coherentCoherent RX, random/tunable lasers ?Energy efficiencyBWuser / GBWuser / GIf ONU only handles assign. subc.User rate = line rateOptical spectrum efficiencyGood if combined with WDM or coherentPower budgetbestIncremental scalability (n.,BW)Limited by device, AWG, or RBSCompatibilityAWGSensitivity issueWirelessSplitter if coherent det.
6 SARDANA projectScalable Advanced Ring-based passive Dense Access Network Architecture”Activity: ICT Network of the Future Grant agreement n.: (SARDANA) STREP: , 2.6 MEuroParticipant nameShort nameCountry1Universitat Politecnica de CatalunyaUPCSpain2France Telecom / OrangeFTFrance3TellabsTELLABSFinland4Intracom S.A. Telecom SolutionsIntraCOMGreece5Instituto de TelecomumicaçõesITPortugal6High Institute of Communication and Information TechnologyISCOMItaly7Research and Education Laboratory in Information Tech.AIT6
7 SARDANA architecture def. Resilient trunkFully passiveHybrid:WDM Metro ringTDM Access treesCascadable remote nodesNew adoption of remotely-pumped amplificationColourless ONURSOATunable laser10G-2.5G (1G-100Mb /user)100 Km1000 usersMulti-operatorBased on xGPON, but transparent.IP traficSARDANA PON
9 3 testbed demonstrations Stakeholder demo in Espoo (Finland) in October 2010 (integration and tests)Field trial in Lannion (France), in January over the metropolitan 12x 18 Km ring cablePublic demo at the Exhibit of FTTH Council Europe 2011, in Milan in February 2011.
10 ACCORDANCE STREP project A Converged Copper-Optical-RaDio OFDMA-based Access Network with High Capacity and FlExibilityObjectivesConsortiumDefinition of a novel Access Network architecture achieving convergence among heterogeneous technologies (optical, wireless, copper).Propose low-cost, low-complexity concepts to achieve ultra high data rates in the access network (up to 100Gbps aggregate and more than 10Gbps in each segment).Introduction of flexible bandwidth allocation concepts using dynamic FDM and OFDM sub-carrier assignment.Provision of smooth migration from and coexistence with legacy access solutions.Demonstration of the ACCORDANCE concepts using experimental test beds.
12 Indicative experimental results by ACCORDANCE partners: OFDM-PON systemOLTONUIndicative experimental results by ACCORDANCE partners:R. Schmogrow et al., “101.5 Gbit/s Real-Time OFDM Transmitter with 16QAM Modulated Subcarriers” , OFC’11OFC’13: P. Schindler et al. OW1A.5
13 Flexible BW Allocation to deal with: the Power difference between (ONU1-ONU2)for proper detection at BER=10-3, leaving ONU1 with B(Q)PSK modulation5040302010ONU2 BW occupation [%]5040302010ONU2 BW occupation [%]fedcba(the mod. Index is kept, hence for lower amount of subcarriers, the ratio between levels increases allowing to have higher SNR → relaxing the receiver sensitivity)abcdefThe high BW granularity allows OFDMA to deal with differential link loss among users.
14 Example of ACCORDANCE MAC Scheduling Various options possible:Multiple subcarriers per ONU (hybrid OFDMA/TDMA)Multiple ONUs per subcarrier (TDMA)PHY/MAC Cross-layer optimizationUse of Adaptive Subcarrier Modulation (ASM)Use a different m-QAM for each ONU based on transmission performanceMAC takes into account different bitrates for a subcarrier each time, depending on the allocationLower delay for same traffic, i.e. capacity is effectively increased
15 COCONUT project: Coherent UD-WDM Can we improve the spectral efficiency in both optical&electrical domains?and the BW?and optical fine granularity ?and the Power budget?Proposal: Coherent UD-WDM with random-wavelength DFB lasers
17 What Ligh Source at Home for WDM ? Requirements:All the same : colourless (wavelength agnostic)for feasible provisioning and high volumes fabricationBroadband: > 1GBit/sPossible solutions:Tuneable laser : still expensive and non-repetibleReflective SOA, wavelength remodulation: limited perform.Random-wavelength laser !?Statistical multiplexingCO adapts to ONUBenefit of chaos ..!
18 Wavelength contention statistics Grid= 6.25GHzTotal BW = 30nmUniform laser statistical distributionMax. N. users = 600Thermal 2nm (DFB)(Results 1000 times aver.)With thermal tuningWithout thermal tuning~ 1 ONU in 512 to replaceSpectral efficiency:Periodical allocation: 16 %Statistical allocation: 14%
20 Possible colaboration research topics Definition of requirements, test of solutions and standardization steps towards NGPON3, implementing the concept of lambda-to-the-home lTTHfrom 100 Mb to 10 Gb to each home or antenna siteDevelopment of low cost phase-modulated lasers for elastic coherent udWDM-PON.Global Convergence of udWDM wired access, wireless and metro networks, in physical, MAC and control plane layerscurrent collaboration between NEC and Accordance/AITAll optical processing with OCDMA multiplexing, transmission and GMPLS routingtopic in joint research by NICT, RomaTre, Aveiro Univ.Extension of the concepts and techniques to smaller ranges:CORE -> ACCESS -> LOCAL WIRED AND WIRELESS