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Towards Terabit per Second Optical Networking
 

Towards Terabit per Second Optical Networking

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Júlio Oliveira - CPqD

Júlio Oliveira - CPqD

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    Towards Terabit per Second Optical Networking Towards Terabit per Second Optical Networking Presentation Transcript

    • Towards Terabit Optical Networks Júlio César R.F. de Oliveira, Ph.D Optical Systems Manager, CPqD
    • Summary Optical Transmission – 100G, 400G, ..... , NxTb/s Optical Networking – Amps., ROADMs, Controlability Microelectronics for Coherent Transmission (ASIC DSP/OTN) Integrated Photonics (Modulators, Receivers, Monitors,...) Conclusions
    • 28-Gbaud QPSK Modulation Format Number Subcarriers Baud Rate (Gbaud) 2 4 16 14 28 32 1 2 8 10 28-Gbaud 16QAM 100G 28-Gbaud 16QAM 200G 400G 28-Gbaud 16QAM 28-Gbaud QPSK 1T 112 Gb/s QPSK 16QAM 448 Gb/s 16QAM 224 Gb/s 16QAM 1.12 Tb/s Toward Terabit Systems QPSK QPSK 1.12 Tb/s
    • 448-Gb/s dual-carrier PDM-16QAM 25GHz 56GHz 112GHz 56GHz 35GHz 25GHz Pre-filtering 35GHz spacing between the two carriers 75GHz Two 50% RZ carriers Occuping a 112 GHz grid Two 50% RZ carriers occuping a 75GHz grid 112GHz Higher performance, spectral efficiency and filtering robustness
    • 448-Gb/s dual-carrier PDM-16QAM Higher performance, spectral efficiency and filtering robustness Mux PRBS PDM-QPSK Modulator EDFA 3 dB PBC PDM Emulator Pulse Carver 5x1 Odd 50 km 50 km 50 km 50 km EDFA EDFA EDFA EDFA EDFAEDFA 26 km SW 1 3 dB SW 2 Pol. Div. Hyb. 90° Orthonormalization Deskew PolarizationDemux CarrierRecovery Demodulation Offline DSP WSS (e) LO ClockRecovery SCOPE(40-GS/s) 3 dB Mux PRBS PDM-QPSK Modulator EDFA 3 dB PBC PDM Emulator Pulse Carver 5x1 Even WaveShaper CDCompensation RZ-PDM-16QAM Eye RZ-16QAM Eye (b) Pol. Incidence angle of 26.5° (a) (c) (d) Modulation Format DP-16QAM Carriers 2 Baud rate 28 G SE 5.6 b/s/Hz Grid 75 GHz Reach 678 km
    • Optical Superchannel: 1.12-Tb/s 1000 km of optical fiber! Features Baud rate 28 Gb/s Modulation RZ-PDM-16QAM Total bit rate 1 Tb/s Bit rate per carrier 224 Gb/s Carrier spacing 35 GHz Spectral Efficiency 6 b/s/Hz Spectral Occupancy 175 GHz Reach 1000 km Feasible application Metropolitan Networks
    • Modulation Format Number Subcarriers Baud Rate (Gbaud) 2 4 16 14 28 32 1 2 8 10 100G 28-Gbaud 16QAM 200G 400G 28-Gbaud 16QAM 1T OFDM has been also investigated… 12.5-Gbaud QPSK 12.5-Gbaud 16QAM Tx Rx Comb Gen. Key-module: Comb Generator Stable Equilized-Power Broadband
    • 450 Gb/s CO-OFDM DP-QPSK (9 carriers) Comb-generator After 226km After 2260km After 3840 km Modulation Format DP-QPSK Carriers 9 Baud rate 12.5 G SE ~4 b/s/Hz Grid 112.5 GHz Reach 3840 km
    • 400-Gb/s CO-OFDM DP-16QAM (4 carriers) Feedback – comb generator Features Baud rate 12.5 GBd Modulation PDM-16QAM Total bit rate 400-Gb/s Bit rate per carrier 100-Gb/s Carrier spacing 12.5-GHz Spectral Efficiency 6.4 b/s/Hz Spectral Occupancy 62.5-GHz Reach 450 km Feasible application Metropolitan Networks
    • Flexible-Transmitter for Terabit applications 3 Carriers Test Features Feasible application Metropolitan Networks Long-Haul Networks Modulation RZ-PDM-16QAM RZ-PDM-QPSK Baud rate 28 Gb/s 28 Gb/s Bit rate per carrier 224 Gb/s 112 Gb/s Total bit rate 672 Gb/s 336 Gb/s Carrier spacing 33.6 GHz 30.8 GHz Spectral Efficiency 6.25 b/s/Hz 3.41 Spectral Occupancy 100.8 GHz 92.4 GHz Reach 900 km 4900 km 3 Carriers Transmission Evaluation -Quasi-Nyquist spacing - Upgradable transmitter; - DSP-Tx free; - Reach adaptable
    • Field Trials: Terabit systems Giga Network Setup
    • Terabits CO-OFDM DP-QPSK 12.5 GBaud RF Sinusoidal 33 dBm AM PM PM Phase shift Phase shift Phase shift 17 dBm Pol. rotator 12 dBm 27 dBm 27 dBm 15 dBm 2 dBm Flexigrid WSS 12.5 GHz AM: Amplitude Modulator PM: Phase Modulator 23 CO-OFDM Carriers 1551 nm PM EDFA 23 dBm18 dBm Pol. rotator CW Laser RF Sinusoidal 33 dBm AM PM PM Phase shift Phase shift Phase shift 17 dBm Pol. rotato r 12 dBm 27 dBm 27 dBm 15 dBm 12.5 GHz AM: Amplitude Modulator PM: Phase Modulator 1551 nm PM EDFA 23 dBm18 dBm CW Laser Pol. rotator 3 dB 3 dB Flexigrid WSS Flexigrid WSS Pol. rotator Pol. rotator Modulation Format DP-QPSK Subcarriers 23 Baud rate 12.5 G SE 3.5 b/s/Hz Grid 300 GHz Reach 4520 km Modulation Format DP-QPSK Subcarriers 45 Baud rate 12.5 G SE 3.65 b/s/Hz Bandwidth 575 GHz Reach 338 km (GIGA)
    • High Speed DAC 34GS/s High Speed DAC 65GS/s Digital (Pre)Filtering
    • 34GS/s DAC (N-QAM) - 2012 16-QAM 256-QAM64-QAM QPSK
    • 65GS/s DAC (N-QAM) - 2013 QPSK 16QAM 32QAM 64QAM
    • 65GS/s Nyquist Filtering Results (Preliminar)
    • CPqD Coherent Transmission Evolution 100 Gb/s 200 Gb/s 400 Gb/s 1 Tb/s ...2 Tb/s
    • Transmission Results summary (CPqD) Bit rate [Gb/s] Modulation Carriers Baud rate [GBd] SE [b/s/Hz] Reach [km] Capacity [Tb/s] 112 PDM-QPSK 1 28 2.1 3200 Long-H 224 PDM-16QAM 1 28 4.2 680 Metro/Long-H 400 PDM-16QAM 4 12.5 6.4 450 Metro/Long-H 448 PDM-16QAM 2 28 5.6 680 Metro/Long-H 450 PDM-QPSK 9 12.5 3.36 3840 Long-H 1120 PDM-16QAM 5 28 6 1000 Long-H 1120 PDM-QPSK 10 28 3.41 450 Metro/Long-H 1150 PDM-QPSK 23 12.5 3.5 4520 Long-H 2250 PDM-QPSK 45 12.5 3.65 338 (GIGA) Metro/Long-H
    • 100G Coherent Optical Module
    • Network Monitoring Cognitive Management and Control Central Office Understanding the network Adding intelligence to the network
    • ... HNLF EDFA/Raman AMP Raman Pump GMPLS Control Plane - Network Registration -Topolgy Discovery - Route wavelength Assingment (RWA); Tx/Rx Degree 1 Degree 2 Degree 3 Degree n ROAD M Tx/Rx ROAD M Read Monitoring Cognitive/Smart Processing Self-Configurable/ Cognitive WDM Network Network actuation TDCM TPMD - Network Monitoring (OLMP): - Input/Output Power - Channel Power - OSNR - BER (Pre and Post FEC) - Chromatic Dispersion - PMD Authonomic Networks
    • Optical Networking Testbed (Logical Layer) TODAY • SDN + GMPLS optical network concept • Network monitor/process/control algorithms to enable smart optical network; • Adaptive and cognitive EDFA; • Network Discovery and Abstraction; Further Works • Adaptive and Cognitive ROADMs • Optical Network Auto- Alignment • UNI-C and UNI-N • Automatic Fault Restoration • Fault Prediction • Spectrum defragmentation • Hitless networks • Integration with OTN-S
    • Optical Networking Testbed (Physical Layer) Laboratorial Testbed Testbed Topology Developed Line Cards (HW/FW)
    • In-Band OSNR Monitor (Pol. Diversity & Interferometric) Filter 50GHz PBS DSP Driver Tx EDFA SMF TAP Rx SMF EDFA τ OSNR Monitor CD = 0 ps/nm & DGD = 0 ps CD = 750 ps/nm & DGD = 45 psECOC2013 Submitted
    • Adaptive and Cognitive Optical Network Algorithms Adaptive EDFA (PTL in submission) • EDFA Noise Figure and Flatness operation point optimization on-line Cognitive EDFA without launch power (LP) BER ok ? Cognitive EDFA with launch power (LP) 1 All BER ok ? LP2 = LP1++ END END -2 dBm (16-QAM) 0 dBm (CO-OFDM) 2 dBm (16-QAM) 4 dBm (CO-OFDM) Cognitive EDFA (OFC2013) • Adaptive EDFA + Channels BER history to adjust best launch power (error free for att. 6 dB) Fail OK Fail OK Fail OK Fail OK OK OK OK OK BER reduction ¹Cog. action transient time ² Attenuation event Occur With cog. (new Gains) Without cognition (same gain)¹ ²
    • Line card development Optical Amplifiers (Optimized) • EDFA • Raman Amp. • Hybrid Amp. C/L Band Routing and Monitoring • PLC and WSS ROADMs; • Optical Channel Monitoring ; • CDC Multi-Cast-Switch; Tech. Transfer
    • 2013 - ASIC DSP
    • ASIC DSP - (BPSK/QPSK/16-QAM)
    • ASICs DSP – Microelectronic Flow
    • Logic Synthesis (Test case 1)
    • Physical Synthesis results Test case 1 (auto FP&R)
    • ASIC OTN 100G Framer / Deframer OTU-4 Mappers/Demapers (SDH/FC/GbE/OTN) Interface1 Interface2 Mux / Demux FEC EFEC OTN Processor
    • ASIC OTN OTN – GbE – SDH – FC OTN 100 Gbit/s
    • ASIC OTN
    • Integrated Photonics - Chip in fabrication (MPW Si run) - Components and Devices - Coherent DP-QPSK Modulators - Coherent Receivers - OSNR in-band monitor - PSGC (Pol. Splitter) - Grating, resistors, PDs, ...
    • Integrated Photonics (PSGC – CPqD Design) Electric Field Amplitude Distribution 60 mm 33 mm
    • Integrated Photonics (Packaging)
    • CPqD Strategy – Towards Terabit Optical Netwoks Design and packaging coherent linecard critical components Cognitive Optical Networks (GMPLS/SDN, Amps, ROADMs, Monitoring) 100 Gb/s 200 Gb/s 400 Gb/s1 Tb/s Coherent transmission evolution towards NxTb/s Focus on INDUSTRY (Products)
    • Conclusions - Fast evolution on optical transmission due to coherent, 100G is a reality, 400G will be the next step and 1T technologies are feasible in lab. right now - Coherent evolution demands new technological domain (DSP, microelectronics, integrated photonics) and generates high dependence in transmitters critical components (ASICs, Mod./Rx), that require massive investments, CPqD with governamental and industry support are developing this systems and components to enable the growth of national WDM systems -Optical networks evolution trough Hybrid Amplifiers, ROADMs, Control Plane and Monitoring are under fast development - The evolution of optical communications are critical to world wide interconnect and plays a key social role in any country in the world, this field are under continuous evolution with a fast established cycle between R&D and market, enabling the broadband evolvution in a sustainable way!!!!!!
    • Acknowledgements
    • Thank You! www.cpqd.com.br