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Pune, India, 13 – 15 December 2010 ITU-T Kaleidoscope 2010 Beyond the Internet? - Innovations for future networks and services M. Jinno, T. Ohara, Y. Sone,

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Presentation on theme: "Pune, India, 13 – 15 December 2010 ITU-T Kaleidoscope 2010 Beyond the Internet? - Innovations for future networks and services M. Jinno, T. Ohara, Y. Sone,"— Presentation transcript:

1 Pune, India, 13 – 15 December 2010 ITU-T Kaleidoscope 2010 Beyond the Internet? - Innovations for future networks and services M. Jinno, T. Ohara, Y. Sone, A. Hirano O. Ishida, and M. Tomizawa NTT Network Innovation Labs. Introducing Elasticity and Adaptation into the Optical Domain Toward More Efficient and Scalable Optical Transport Networks

2 2 Outline Background: Growing anticipation SE-conscious optical networking Early initiatives by ITU-T Elastic optical path network as a candidate to support future Internet and services Adoption scenarios from rigid optical networks to elastic optical path network Possible standardization study items and some solutions relevant to future ITU-T activities

3 3 Background (1): Successful Deployment of Optical Networks Worldwide intensive R&D activities Continuous initiative by ITU-T toward OTNs and ASONs G.709 OTN augmentation to transport 100 GE traffic 100 M 1 G 10 G 100 G 1 T 10 T 100 T Year of commercialization in Japan Per fiber capacity (b/s) Spectral efficiency (b/s/Hz) 100 Gb/s x 80 (projected) 40 Gb/s x Gb/s x 80 WDM TDM

4 4 Background (2): Slowing Down of SE Improvement Fixed optical amplifier bandwidth (~ 5 THz) Per fiber capacity increase has been accomplished through boosting SE (bit rate, wavelength, symbol per bit, state of polarization) Bit loading higher than that for QPSK causes rapid increase in SNR penalty, and results in shorter optical reach SE improvement for P2P is slowing down, meaning higher rate data need more spectrum Bit rate per channel (Gb/s) Relative optical reach with constant energy per bit (a.u.) Spectral efficiency (b/s/Hz) DP-QPSK DP-16QAM DP-64QAM DP-256QAM DP-1024QAM QPSK BPSK Gbaud Optical amplifier bandwidth (~ 5 THz) TDM WDM Multiplexing technology evolution PDM Multi-level mod.

5 5 Background (3): Growing Concern of SE in Networking Fiber capacity crunch concerns are driving optical networking toward a spectral-efficiency-conscious design philosophy Right-sized optical bandwidth is adaptively allocated to an end-to-end optical path Spectral-efficiency-conscious, adaptive networking approach has attracted growing interest Ex. Elastic optical path network OFC2011 WS Spectrall y/bit-rate flexible optical network ECOC2010 Symposium Towards 1000 Gb/s OFC2010 WS How can we groom and multiplex data for ultra-high- speed transmission ECOC2009 Symposium Dynamic multi-layer mesh network OECC2010 Symposium Future optical transport network ECOC2008 Demonstration of novel spectrum- efficient elastic optical path network …. (NTT)

6 6 Expected Early ITU-T Initiatives Early ITU-T initiatives on studying possible extension of OTN and ASON standards are indispensable. Greatly support rapid advance and adoption of spectrally-efficient and adaptive optical networks Starting point regarding studying possible extension of OTN and ASON standards in terms of network efficiency Clarify what should be inherited, what should be extended, and what should be created

7 7 Elastic Optical Path Network Spectrum-efficient transport of 100 Gb/s services and beyond through introduction of elasticity and adaptation into optical domain Adaptive spectrum resource allocation according to Physical conditions on route (path length, node hops) Actual user traffic volume 1. SE-conscious adaptive signal modulation 2. SE-conscious elastic channel spacing Elastic channel spacing 250 km 400 Gb/s 100 Gb/s 1,000 km Fixed format, grid Adaptive modulation QPSK 200 Gb/s QPSK16QAM Path length Bit rate Conventional design Elastic optical path network

8 8 Enabling Hardware Technologies (1) Rate and Reach Flexible Transponder Introduce coherent detection followed by DSP Optimizing 3 parameters provides required data rate and optical reach while minimizing spectral width (Symbol rate) x (Number of modulation levels) x Number of sub- carriers Flexible reach Change the number of bits per symbol with high-speed digital-to- analogue converter and IQ-modulator Flexible rate Optical OFDM is spectrally-overlapped orthogonal sub-carrier modulation scheme Customize number of sub-carriers of OFDM Flexible reach transmitter 100 G 400 G Flexible rate/reach transmitter 100 G~ 400 G

9 9 BV WXC BV WXC BV WSS BV WSS BV WSS BV WSS BV WSS BV WSS BV WSS BV WSS BV WSS BV WSS BV WSS BV WSS BV transponder BV transponder Output fiber Input fiber Bandwidth agnostic WXC Spatial light modulator Bandwidth variable wavelength selective switch (WSS) Grating Optical freq. Trans- mittance Enabling Hardware Technologies (2) Bandwidth Agnostic WXC Introduce bandwidth-variable WSS based on, e.g., LCoS Required minimum spectrum window (optical corridor) is open at every node along optical path Required width of optical corridor is determined by factoring in signal spectral width and filter clipping effect accumulated along nodes. 400 Gb/s 40 Gb/s 100 Gb/s 400 Gb/s 40 Gb/s

10 10 Possible Adoption Scenarios Step-by-step Triggered by future higher rate client signals (e.g., 400 Gbps) Earlier adoption To facilitate 100 Gbps ROADM design

11 11 Step-by Step Adoption Scenario: Higher Rate Client Triggered (e.g., 400 Gb/s) Possible next Ethernet rate, 400 G, could appear around Optical reach and SE are not independent parameters in 400 G era. Balancing optical reach and SE in 400 G systems will most likely require elastic spectral allocation Elastic channel spacing High-SE multi-rate traffic accommodation Dynamic spectral allocation Optical BoD, highly survivable restoration 1 G 10 G 100 G 1 T Year of standardization Bit rate (b/s) GE 10 GE 40 GE 100 GE OTU1 OTU3 OTU2 OTU4 OTU5 (projected) STM GE (projected) STM64 Equally-spaced Non-ITU-T grid High-SE 400 G accommodation P2P Distance adaptive spectral allocation High-SE multi- reach traffic accommodation P2P Network

12 12 Earlier Adoption Scenario: Large-Scale 100 Gb/s ROADM Design Facilitation Even employing DP QPSK modulation, transmitting 100 Gbps signals over multiple hops of ROADMs on a 50 GHz grid is still tough task. Distance adaptive spectrum allocation will facilitate 100 Gb/s ROADM design for longer paths Significant spectral-saving when compared with the worst- case design on a 100 GHz grid. 112 Gb/s DP-QPSK 112Gb/s DP-16QAM 112 Gb/s DP-QPSK Number of node hops Allocated spectral width [GHz] 112 Gb/s DP-QPSK 100 GHz grid Distance adaptive Spectrum allocation maps Distance–adaptive spectrum allocation Network utilization efficiency % 100 GHz grid Distance adaptive Required total spectrum at most occupied link (THz)

13 13 Possible SG15 Study Items OTN NW Architecture IF & Mapping Physical Layer Frequency Grid Line-IF Application ASON Protocol Neutral Spec. Routing & Signaling

14 14 OTN Network Architecture G.872 Architecture of optical transport networks specifies functional architecture of OTN from network level viewpoint Layered structure of Optical Channel (OCh), Optical Multiplex Section (OMS), and Optical Transmission Section (OTS) Although data rate, modulation format, and spectral width of optical path in elastic optical path network may change, elastic optical path is naturally mapped into OCh See no significant impact on current G.872 OMS OTS OMS OTS OMS OTS MuxDemux MuxDemux Tx MuxDemux Tx Rx 3R ODUflex, ODUk OTUflex, OTUk-xv OCh Bandwidth agnostic WXC OTUflex, OTUk-xv

15 15 ODU OTN Interfaces and Mapping: Current OTN G.709 Interfaces for the optical transport network (OTN) specifies Interfaces and mappings of OTN Conflicting operator requirements Transport a wide variety of client signals while minimizing types of line-interfaces in order to reduce capital expenditures, which are dominated by line-interface costs. LO/HO ODUs and ODUflex can address these conflicting requirements. LO ODU offers versatility to accommodate various client signals and HO ODU offers simplicity in terms of physical interface. 1 Gb/s 10 Gb/s 100 Gb/s ODUflex (L) Client signal ODU (L)ODU (H) OTU ODU 0 ODU 1 ODU 2 ODU 3 OTU 1 OTU 2 OTU 3 MapMuxMap OCh E/O OCh ODU 4 OTU 4

16 16 OTN Interfaces and Mapping: Possible Flexible OTU Extension Rate-flexible OCh enables cost-effective transport of various client signals in fully optical domain w/o electrical multiplexing and grooming Introduction of rate-flexible OTUs (OTUflex) and rate-flexible HO ODUs (HO ODUflex). 1 Gb/s 10 Gb/s 100 Gb/s 1 Tb/s ODUflex (H) OTUflex Client signal ODU (L)ODU (H)OTU ODU 0 ODU 1 ODU 2 ODU 3 ODU 4 OTU 1 OTU 2 OTU 3 OTU 4 OTUflex ODUflex MapMuxMap Rate-flexible transponder Conventional transponder OCh E/O OCh ODUflex (L)

17 17 Physical Layer Specification (1): Possible Frequency Grid Extension G Spectral grids for WDM applications: DWDM frequency grid Anchored to THz, and supports various channel spacings of 12.5 GHz, 25 GHz, 50 GHz, and 100 GHz Explicitly allocate spectral resources to optical path To quantize continuous spectrum into contiguous frequency slots with appropriate slot width Frequency slot (12.5 GHz width) HLHLHL 50 GHz 125 GHz37.5 GHz Frequency slot allocation n=0n=1n=-1 f=193.1 THzf=193.2 THz f=193.0 THz 100 GHz 50 GHz 25 GHz 12.5 GHz Frequency grid (G.694.1)

18 18 Physical Layer Specification (2): Possible Intra-Domain Application Extension Conventional systems: Target distance and capacity are a fixed set of values Elastic optical path network: Line interfaces will have multi-reach functionality Trade-off between optical reach and SE Variable sets of parameters for target distance and capacity (TD 1, TC 1 ) Distance Capacity (TD 2, TC 2 ) (TD 3, TC 3 ) Elastic optical path network (TD, TC) Distance Capacity Conventional optical network TD: Target distance TC: Target capacity BR: Bit rate 40.10G-20L652A(C) Target Capacity =40 x 10 Gb/s Target distance =20-span, long-haul G.652.A- fiber (C-band) Recommendation G Longitudinally compatible intra- domain DWDM applications Ex.

19 19 ASON Control Plane G. 805, G.7713, G.7714, and G.7715 provide network resource model, requirements, architecture, and protocol neutral specifications for automatically switched optical networks (ASONs), Based on functional models for SDH (G.803) and OTN (G.872) No significant impact on current ASON standards when introducing distributed control plane into elastic optical path networks

20 20 Possible Technology-Specific Extension of Routing and Signaling Need discussion on extension of GMPLS protocols in IETF and OIF with ITU-T SG15 Define new parameters in signaling messages Label request object Upstream label object … Explicit route object Sender TSpec object … Label object Record route object … Flow spec object … PATH messageRESV message Switching type: spectrum switching capable Parameters in objects Label: (start slot, end slot) Modulation format: (symbol rate, no. of sub-carriers, modulation level)

21 21 Conclusions Elastic optical path network Required minimum spectral resources are adaptively allocated Possible adoption scenarios Study items relevant to future standardization activities of ITU-T SG15 Possible extension of OTN, physical layer, and ASON standards in terms of network efficiency

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