Georgia Tech 100G Center

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1 Georgia Tech Industry-University 100G Networking Center Stephen E Ralph Prof of Electrical and Computer Engineering stephen.ralph@ece.gatech.edu School of Electrical and Computer Engineering

2 Georgia Tech 100G Networking Center Mission Develop a broad quantitative understanding of optical, electronic and signaling interactions to enable the creation of design rules for 100Gbps networks Lead discovery of high-speed electronics, signal processing and optical systems modeling to enable ultra high-speed communications Produce sought after graduates with broad understanding and deep skills Generate significant intellectual property Enhance the economic prosperity of the state by attracting high technology jobs Methodology An industry led communications and information technology center that exploits a multidisciplinary team High-speed Silicon based devices Signal processing Optics and Photonics

3 Members Founding members Supporting members New members Nistica Digital Lightwave

4 Georgia Tech Faculty Prof. Stephen E Ralph Director Fiber Optics, Optoelectronic devices and signaling Prof. Gee K Chang Co-director Fiber Optics, Optoelectronic devices Prof. John Barry Signaling Prof. John Cressler SiGe devices Prof. Steve McLaughlin Signaling Forward error correction

5 Eight companies have joined forces with the Georgia Institute of Technology to establish the 100 Gigabit-per-second optical networking research center and testbed, the first academic -industrial consortium of its kind in the world Over $2.3 million in support has been secured for this facility by the Center s members and Georgia Tech Academic and industry personnel to perform multidisciplinary research in all aspects of 100G transmission A variety of network architectures will be available each with realistic impairments found in access networks, metro and long haul links These efforts actively support the upcoming 40G/100G standards

6 Funding $1.86M from 8 companies $1,860k $840k cash support $1020k in-kind support Support spans two years of Phase I Georgia Research Alliance $300k GRA is a state agency that invests in Industry/University efforts that are strategically important to the Georgia economy School of Electrical Computer Engineering $50k Senior Vice Provost of Research and Innovation $50k College of Engineering $50k

7 Phase I Gbps Electronics AtoD converters High-Throughput I/O for DSP engines Amplifiers and Clock and recovery Equalizers Coherent optical links Advanced modulation formats Polarization multiplexing Advanced signal processing >50G Equalization Forward error correction Impairment mitigation Shorter-reach high-speed optical links <10km 100Gbps technologies FFTX 40 and 100G MMF solutions Active cables for data centers

8 100G Testbed Metrics Simulations in conjunction with experiment Performing analysis in multiple optical link simulator platforms RSoft s OptSim OptiSystem s OptiSystem VPI photonics s VPI TransmissionMaker Isolate parameters of interest OFDM modulation/demodulation PMD at 40Gbps Industry/Academic/Government Support IEEE 802.3b HSSG Phy Layer 100Gbps on 40km SMF 100Gbps on 10km SMF Optical Internetworking Forum (OIF) 100G long distance DWDM TX framework/components FEC for 100G DP-QPSK long distance 40Gbps Optical Modulation Technologies Progressive Testing 40/43 Gbps OOK Point-to-Point 40/43 Gbps OOK Recirculating Loop 28 Gbaud DQPSK PolMux Input & Output OFDM Spectra: OptSim 5x 10Gbps WDM: OptiSystem

9 Phase I Test Bed Schedule Unamplified point-to-point 100 m OM3 and OM4 Multimode links; 850nm CWDM (30 September 2008) 10 km SMF (31 October 2008) 40G: CWDM and Serial links 100G: CWDM links 40km SMF (30 November 2008) 100G Amplified DWDM point to point (October ) 7 Channel, 50GHz DWDM Three 80km spans of low PMD fiber (higher PMD legacy available 2009) Initially all EDFA amplifiers, addition of Raman 2 nd Qtr 2009 Potential for 8+ spans with various dispersion and dispersion slope Variety of ROADMs and tunable bandpass filtering Amplified DWDM Loop (1 st Quarter 2009) Simulate km 7 Channel, 50GHz DWDM

10 Major Efforts Phase based modulation formats Coherent receivers Polarization multiplexing Sensitivity to dispersion map, fiber variation, Gbps Electronics AtoD converters High-Throughput I/O for DSP engines Amplifiers and Clock and recovery Equalizers Advanced signal processing >50G Equalization Forward error correction Impairment mitigation Shorter-reach high-speed optical links <10km 100Gbps technologies FFTX 40 and 100G MMF solutions Active cables for data centers

11 40/43 Gbps Point-to-Point: 10 Gbps Engineered Link 40/43Gbps TX λ m λm -1 λ1... λ2 100GHz Mux INT 80km SSMF EDFA WSS x3 VOA INT Demux TBPF PIN/TIA CDR 40G BERT Scope/OSA 10G BERT PC... λ M 100GHz Mux Power/ OSNR monitor DCM Power/ OSNR monitor Demux PIN/TIA CDR Scope/OSA Network 50GHz channel spacing Modern (TrueWave) and legacy(high PMD) fiber Cascaded ROADMS Adjacent channels at 10G OOK Gain equalizers Dynamic Spectral Shaping Notes. INT: Interleaver PC: Polarization Controller DCM: Dispersion Compensation Module WSS: Wavelength Selective Switch VOA: Variable Optical Attenuator TBPF: Tunable Bandpass Filter CDR: Clock & Recovery 1 st Link Test scheduled for 31 October 2008

12 40/43 Gbps Recirculating Loop 40/43Gbps TX λ1.. λ m 100GHz Mux Demux TBPF PIN/TIA CRU 40G BERT λm -1. λ2 INT 2x2 OS VOA INT Scope/OSA 10G BERT PC... λ M 100GHz Mux Power/ OSNR monitor x3 WSS 80km SSMF EDFA Power/ OSNR monitor Demux PIN/TIA CRU Scope/OSA Network 50GHz channel spacing Modern (TrueWave) and legacy fiber Cascaded ROADMS Adjacent channels at 10G OOK Gain equalizers Dynamic Spectral Shaping DCM Notes. INT: Interleaver PC: Polarization Controller DCM: Dispersion Compensation Module WSS: Wavelength Selective Switch VOA: Variable Optical Attenuator TBPF: Tunable Bandpass Filter CRU: Clock Recovery Unit 1 st Link Test scheduled for January 2009

13 Test bed overview Network 50GHz channel spacing Modern (TrueWave) and legacy fiber Cascaded ROADMS Linear (pt to pt) and loop configurations Adjacent channels at 10G OOK Gain equalizers Dynamic Spectral Shaping Modulation (10GSps, 28GSps, 40/43GSps) Multilevel formats OOK (NRZ and RZ) DPSK with >4 levels (NRZ and RZ) DQPSK (NRZ and RZ) OFDM inverse NRZ Polarization Mux Performance Monitoring OSNR Constellation diagrams (real time) BER Spectral Integrity Coherent Detection OSNR Constellation diagrams (real time) Oversample AtoD converters Digital filters Digital impairment mitigation

14 40/43 Gbps Transmitters 40Gbps NRZ_OOK TX 40G PRBS 40Gbps RZ_OOK TX 40G PRBS 40G PRBS Phase Shift 40G Clock Tunable DFB 40G IntMod Tunable DFB 40G IntMod 40G IntMod 40Gbps NRZ_OOK TX 28Gbaud RZ_DQPSK TX 40G PRBS 40G PRBS Tunable DFB 28Gbaud NRZ_DPSK TX 28G PRBS 28G PRBS Tunable DFB Phase Shift 40G IntMod MZM π/2 28G PRBS 28G PRBS Tunable DFB π/2 Nested MZM 28G Clock Notes. : Electrical Amplifier MZM: Mach-Zehnder Modulator 40G IntMod: Similar construction to the MZM in the DPSK diagram, but without the π/2 phase shift 40G IntMod

15 40/43 Gbps Receivers 40Gbps RX (for OOK) 40G BERT Performance Monitoring CRU OSNR Constellation diagrams (real time) PIN/TIA Scope/OSA BER Spectral Integrity 40Gbps RX with Balanced Receiver (for D(Q)PSK) 40G BERT DI BPD PIN/TIA Notes. : Electrical Amplifier CRU: Clock Recovery Unit DI: Delay Interferometer BPD: Balanced PIN Photodiode CRU Scope/OSA

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