DWDM Fiber-Wireless Access Systems

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Antonio Caballero - TU of Denmark

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DWDM Fiber-Wireless Access Systems

  1. 1. DWDM Fiber-Wireless Access Systems Antonio Caballero Jambrina acaj@fotonik.dtu.dkacaj@fotonik.dtu.dk
  2. 2. Thanks to Idelfonso Tafur Monroy Darko Zibar Valeria Arlunno Xiaodan Pang Neil Guerrero Gonzalez Lei Deng … And the whole metro-access group 28th May 20132 DWDM Fiber-Wireless Access Systems And the whole metro-access group (past and present)
  3. 3. Outline • Motivation: wireless and optics convergence • High capacity wireless links: how to achieve them • Photonic technologies for wireless signal generation and detection • RoF for access networks • Wireless detection & transport • Phase-modulated optical link assisted with coherent detection 28th May 20133 DWDM Fiber-Wireless Access Systems • Phase-modulated optical link assisted with coherent detection • Application scenarios • Wireless generation • mm-wave photonic generation towards 100 Gbps wireless links • Wireless generation and detection • Transparent all photonic mm-wave • Conclusion
  4. 4. Motivation: wireless and optics convergence 28th May 20134 DWDM Fiber-Wireless Access Systems optics convergence
  5. 5. Telecommunication Network Hierarchy Long Haul Networks Metropolitan Networks Metro-access Networks • Optical fiber getting closer to the customer premises • Wireless brings flexibility to the 28th May 20135 DWDM Fiber-Wireless Access Systems 5 In-Home Networks PC Corporate LAN Residential PON Rural Area Network Hybrid Optical-Wireless Metro-access Networks • Wireless brings flexibility to the communications
  6. 6. High capacity wireless links 28th May 20136 DWDM Fiber-Wireless Access Systems links
  7. 7. Applications of high speed wireless links Optical fiber 28th May 20137 DWDM Fiber-Wireless Access Systems • Sync and go • All wireless connectivity at business and home • HD video streaming (uncompressed) • Cloud computing • Video-calls http://wirelessgigabitalliance.org/ • Beyond LTE Cellular networks • Disaster recovery links • Fast deployment wireless networks • Extension of optical fiber links Optical fiber Optical fiber
  8. 8. How to achieve multi gigabit wireless links I Higher RF carrier frequencies • GHz of bandwidth available • Higher Air attenuation 28th May 20138 DWDM Fiber-Wireless Access Systems Advanced modulation techniques • High spectral efficiency • Stringent requirements on linearity and SNR E.E. Altshuler et al., IEEE TAP 1988
  9. 9. 100Mbps 1Gbps 10Gbps 100Gbps W ireless links (standard W LAN) W ireless links (research) Optical serial interface (products) Bitrate Optical serial interface (research) How to achieve multi gigabit wireless links II 28th May 20139 DWDM Fiber-Wireless Access Systems 1988 1992 1996 2000 2004 2008 2012 10Mbps 100Mbps W ireless links (standard W LAN) W ireless links (research) Year Bring the capacity of baseband optical links to wireless links Multi-gigabit wireless links Sources P. Winzer, IEEE Comm. Mag. July 2010 G. Fettweis, IEEE VTC Fall 2007 A. Stöhr, OFC/NFOC 2011
  10. 10. Photonic technologies for wireless signal generation 28th May 201310 DWDM Fiber-Wireless Access Systems wireless signal generation and detection
  11. 11. Concept and requirements 28th May 201311 DWDM Fiber-Wireless Access Systems Photonic Generation (Downlink) • Capable to generate high speed RF signals • High bandwidth of E-O components Transport (optical fiber) • Long reach links • High bandwidth • Shared architecture with PON Photonic Detection (Uplink) • High bandwidth • Requires high linearity • Digital Coherent receivers
  12. 12. Radio-over-fiber links for access networks •Hybrid optical-wireless networks • IM-DD schemes with SSB or DSB for longer reach (downlink only) [1,2] • Ultra-dense WDM-PON architecture ([3,4] • Converged PON [5,6] • Baseband: QPSK • Radio-over-fiber: UWB, Wimax, OFDM 28th May 201312 DWDM Fiber-Wireless Access Systems [1] C. Lim et al., JON 2009 [2] D. Wake et al., JLT 2010 [3] Z. Jia et al., JLT 2007 [4] G.-K. Chang et al., JON 2009 [5] K. Prince et al., PTL 2009 [6] N. Guerrero, OFC 2011
  13. 13. Photonic Digital Coherent Receiver • Combining the received optical signal (Ein) with a local oscillator 28th May 201313 DWDM Fiber-Wireless Access Systems • Combining the received optical signal (Ein) with a local oscillator (ELO) in a 90o optical hybrid • Digital signal processing • Demodulation of different types of signals • Baseband: BPSK, QPSK, 16QAM, OFDM • Radio-over-fiber: Phase Modulated, Intensity Modulated • Compensation of link impairments • Fiber chromatic dispersion • Laser free-running beating • Transmitter and receiver imbalances
  14. 14. Wireless detection & transport: 28th May 201314 DWDM Fiber-Wireless Access Systems transport: Phase-modulated optical link assisted with coherent detection
  15. 15. Photonic technologies for wireless detection I •Mature technology (90s) •RF power fading by chromatic dispersion • SSB, DSB •Linearity limited • Techniques for linearization Intensity Modulation Direct Detection (IM-DD) [1,2] 28th May 201315 DWDM Fiber-Wireless Access Systems •Higher linearity than IM-DD •Limited bandwidth of operation •Phase information recovery • Interferometric detection [4] • PM to IM [5] Phase Modulation Direct Detection (PM-DD) [3,4,5] [1] C. Cox et al., MTT 2006 [2] J. Yao, JLT 2009 [3] R. Kalman et al., JLT 1994 [4] V. Urick et al., JLT 2007[6] [5] H. Chi et al., JLT 2009
  16. 16. Photonic technologies for wireless detection II •PLL for phase tracking •Optical domain (OPLL) • Difficult to implement • Limited bandwidth •Digital Domain (DPLL) • Homodyne detection • Independent light source transport Phase Modulation Phase Tracking Receiver (PM-PLL) [6,7] 28th May 201316 DWDM Fiber-Wireless Access Systems • Independent light source transport •Independent and free-running Local Oscillator •Digital Signal Processing •Scalability to higher RF •Easy integration with PON Phase Modulation Digital Coherent Receiver (PM-Coh) [8,9] [6] Y. Li et al., JLT 2009 [7] T. Clark et. al., MTT 2010 [8] D. Zibar et. al., PTL 2009 [9] A. Caballero et. al., JLT 2011
  17. 17. PM-Coh link with photonic downconversion1,2 28th May 201317 DWDM Fiber-Wireless Access Systems 1549.5 1550.0 1550.5 -80 -60 -40 -20 0 Power[dBm] Wavelength [nm] 38.4 GHz 1549.5 1550.0 1550.5 -80 -60 -40 -20 0 Power[dBm] Wavelength [nm] 40 GHz [1] A. Caballero et al., ECOC’10 PDP3.4 [2] A. Caballero et. al., JLT 2011
  18. 18. PM-Coh link with photonic downconversion1,2 3 2 UFEC Limit -log(BER) B2B 40 km Tx 3 2 -log10(BER) 1 Gbaud 800 Mbaud 28th May 201318 DWDM Fiber-Wireless Access Systems 22 23 24 25 26 27 28 29 30 31 32 33 4 40 km Tx OSNR [dB/0.1 nm] 1,5 2,0 2,5 3,0 3,5 4,0 4,5 4 -log10(BER) Bitrate [Gbps] 625 Mbaud 500 Mbaud • Pioneering results on high-capacity wireless detection • Up to 3.2 Gbps at 40 GHz below FEC limit • Electrical bandwidth of only 4 GHz [1] A. Caballero et al., ECOC’09 PDP3.4 [2] A. Caballero et. al., JLT 2011
  19. 19. Wireless detection & transport: 28th May 201319 DWDM Fiber-Wireless Access Systems transport: Application scenarios
  20. 20. PM-Coh link for DAS I • Next generation cellular access networks (LTE+) will require Distributed Antenna Systems for high throughput • Current digitized RF transport interface demands high bitrate backhaul link 28th May 201320 DWDM Fiber-Wireless Access Systems backhaul link • Digital Coherent Radio-over-fiber technology as solution • Scalable • Transparent • High capacity
  21. 21. PM-Coh link for DAS II Subcarrier multiplexing 28th May 201321 DWDM Fiber-Wireless Access Systems 3 Cell system x 4 Antennas/cell Total 12 different channels Same frequency allocation Subcarrier multiplexing Higher spectral efficiency PM-Coh RoF Link Transparent transport of the wireless signals
  22. 22. PM-Coh link for DAS III 12 subcarriers, 100 Mbaud 16QAM 1 2 3 4 5 4 3 2 -log10(BER) Modulation Index (%) 2 3 4 5 8 12 16 20 24 EVMRMS(%) Modulation Index (%) 100 kHz Experiment 28th May 201322 DWDM Fiber-Wireless Access Systems 6 subcarriers, 200 Mbaud 16QAM 2 3 4 5 6 7 4 3 2 -log10(BER) Modulation Index (%) Modulation Index (%) 2 3 4 5 6 7 8 8 12 16 20 24 EVMRMS(%) Modulation Index (%) 100 kHz Experiment Modulation Index (%)
  23. 23. Converged wireless-baseband access I 28th May 201323 DWDM Fiber-Wireless Access Systems Reconfigurable Digital Coherent Receiver
  24. 24. 5 4 3 2 B2B single channel 78km single channel 78km all wavelengths -log(BER) Coherent VCSEL(a) 4 3 2 B2B single channel B2B all wavelengths 78km single channel 78km all wavelengths -log(BER) (c) IR-UWB IR-UWBCoherent VCSEL Single reconfigurable DSP enabled coherent receiver •Heterogeneous hybrid access networks Converged wireless-baseband access II 28th May 201324 DWDM Fiber-Wireless Access Systems -30 -29 -28 -27 -26 4 3 2 B2B single channel B2B all wavelengths 78km single channel 78km all wavelengths -log(BER) Received Power [dBm] (b) QPSK -26 -25 -24 -23 -22 -21 -20 5 Received Power [dBm] -26 -24 -22 -20 -18 Received Power [dBm] -32 -31 -30 -29 -28 -27 5 4 3 2 B2B single channel B2B all wavelengths 78 km single channel 78 km all wavelengths -log(BER) Received Power [dBm] (d) OFDM RoF QPSK OFDM RoF •Heterogeneous hybrid access networks •Mix modulation formats •Mix bit rates
  25. 25. Hybrid Wireless-Optical Broadband-Access Network (WOBAN) Advantages of two technologies Ring - PON • High capacity • Transparency • Multi-channel 28th May 201325 DWDM Fiber-Wireless Access Systems • Multi-channel • Upgrading Wireless network • Flexibility • Cost-savings • Centralize control • Frequency re-use
  26. 26. WOBAN II: Experimental setup • PM-Coh for RoF transport • Passive Antenna Base Stations • Raman amplification High OSNR Possible centralize pump location Wide spectral gain range Optical+Wireless 28th May 201326 DWDM Fiber-Wireless Access Systems -39 -38 -37 -36 -35 -34 -33 -32 -31 -30 4 3 2 B2B single λ B2B 2 neigh. B2B 4 neigh. Optical+Wireless 4 neighbours Optical single λ Optical 2 neigh. Optical 4 neigh. -log(BER) Received Power [dBm]
  27. 27. Wireless generation: Millimeter-wave generation 28th May 201327 DWDM Fiber-Wireless Access Systems Millimeter-wave generation towards 100 Gbps wireless links
  28. 28. 100Mbps 1Gbps 10Gbps 100Gbps W ireless links (standard W LAN) W ireless links (research) Optical serial interface (products) Bitrate Optical serial interface (research) Motivation 28th May 201328 DWDM Fiber-Wireless Access Systems 1988 1992 1996 2000 2004 2008 2012 10Mbps 100Mbps W ireless links (standard W LAN) W ireless links (research) Year Bring the capacity of baseband optical links to wireless links 100 Gbps wireless links Sources P. Winzer, IEEE Comm. Mag. July 2010 G. Fettweis, IEEE VTC Fall 2007 A. Stöhr, OFC/NFOC 2011
  29. 29. Photonic technologies for wireless generation •Coherent beating at the PD •Electrical signal and RF carrier generation • Frequency doubling and quadrupling techniques •Difficult to scale at high RF frequencies Direct Intensity Modulation with Direct Detection [1,2,3] 28th May 201329 DWDM Fiber-Wireless Access Systems frequencies •High capacity optical baseband generation •Incoherent beating at the PD •Stringent requirement on laser linewidth •Scalable to high RF frequencies Photonic generation and RF heterodyning [4,5] [1] C. Cox et al., MTT 2006 [2] J. Yao, JLT 2009 [3] C. Lim et al., JON 2009 [4] U. Gliese et al., MTT 1998 [5] X. Pang et al., OE 2012
  30. 30. State of the art on mm-wave links Data rate (Gb/s) 70 90 110 [6] [1] [10] [11 ] [12] [1] X. Pang, Opt. Exp. (2011) [2] A. Kanno, Opt. Exp. (2011) [3] W. Jiang, OFC’12 [4] A. Hirata, MTT, (2012) [5] T. Kosugi, SRiF’13 [6] S. Koenig, OFC’13 PDP [7] H.-J. Song, EL. (2012) [8] A. Kanno, MWP’12 [9] C.-H. Ho, OFC’12 [10] A. Kanno, ECOC’12 [11] Z. Dong, OFC’13 [12] J. Zhang, PTL’13 28th May 201330 DWDM Fiber-Wireless Access Systems Frequency band 10 30 50 60 GHz 75-110 GHz 120 GHz 237.5 GHz 300 GHz [3] [2] [1] [4] [5] [7] [8] [9] [12] J. Zhang, PTL’13
  31. 31. 100Gbps wireless: Experimental Setup I 28th May 201331 DWDM Fiber-Wireless Access Systems •Optical baseband 16-QAM generation using binary signal generator •Free running ECL (100 kHz linewidth) as LO for photonic up-conversion •Double-stage down-conversion: 1. Electrically W-band to 1-26GHz; 2. Digitally from 1-26 GHz to baseband
  32. 32. 100Gbps wireless: Experiment Setup II 28th May 201332 DWDM Fiber-Wireless Access Systems X branch Y branch
  33. 33. 100Gbps wireless: Experiment Setup III W-band Antenna 100 GHz W1-WR10 Adaptor 28th May 201333 DWDM Fiber-Wireless Access Systems 100 GHz PDW-band Antenna W-band LNA W-band Mixer LO IF
  34. 34. 100Gbps wireless: Experiment results 2 1 Wireless d = 50cm Wireless d = 150cm Wireless d = 200cm -log(BER) 50 Gbit/s 50 Gbit/s SP 16-QAM 2 1 Wireless d = 50 cm Wireless d = 75 cm Wireless d = 120 cm -log(BER) 100 Gbit/s 100 Gbit/s PolMux 16-QAM 28th May 201334 DWDM Fiber-Wireless Access Systems -1 0 1 2 3 4 5 6 7 8 9 10 5 4 3 2 -log(BER) Optical power into PD (dBm) FEC -1 0 1 2 3 4 5 6 7 8 9 5 4 3 2 -log(BER) Optical power into PD (dBm) FEC
  35. 35. Multi-band OFDM signal transmission in the W-band I 28th May 201335 DWDM Fiber-Wireless Access Systems
  36. 36. Multi-band OFDM signal transmission in the W-band II 28th May 201336 DWDM Fiber-Wireless Access Systems
  37. 37. Wireless generation and detection: 28th May 201337 DWDM Fiber-Wireless Access Systems detection: Transparent all-photonic mm- wave
  38. 38. Motivation Photonic generation and RF heterodyning •High capacity optical baseband generation •Incoherent beating at the PD •Stringent requirement on laser linewidth •Scalable to high RF frequencies 28th May 201338 DWDM Fiber-Wireless Access Systems Intensity Modulation Direct Detection (IM-DD) •Mature technology (90s) •RF power fading by chromatic dispersion • SSB, DSB •Linearity limited • Techniques for linearization • Optical OFDM generation • Baseband fiber transmission • Digital coherent detection
  39. 39. Principle of photonic generation and detection (a) Multicarrier generation (b) O-OFDM baseband signal (c) Optical signals for RF optical heterodyning (d) mm-wave RF signal generated 28th May 201339 DWDM Fiber-Wireless Access Systems (e) Optically modulated RF signal (f) SSB baseband signal containing the transmitted O-OFDM signal
  40. 40. Experimental Setup 0 w OFDM QPSK •Baseband electrical signal generation •Optical heterodyning mm-wave generation •Free running lasers 28th May 201340 DWDM Fiber-Wireless Access Systems •Complete transparency in carrier frequency and modulation format •Digital coherent receiver as for baseband optical communications 1548,4 1548,8 1549,2 1549,6 1550,0 -70 -60 -50 -40 -30 -20 -10 Power[dBm] Wavelength [nm] w OFDM QPSK w/o OFDM QPSK 82 GHz 10 GHz
  41. 41. Experimental results 3 2 1 Single carrier: 5Gbaud@60GHz 10Gbaud@100GHz OFDM,2 subcarriers: 5Gbaud,sc1@60GHz 5Gbaud,sc2@60GHz 5Gbaud,sc1@100GHz 5Gbaud,sc2@100GHz -log(BER) 3 2 O-OFDM,2SC,10Gbaud@100GHz O-OFDM,2SC,8Gbaud@100GHz O-OFDM,3SC,4Gbaud@60 GHz -log10[BER] O-OFDM,2SC,5Baud@60 GHz UFEC -2,0 -1,5 -1,0 -0,5 0,0 0,5 1,0 1,5 2,0 -2,0 -1,5 -1,0 -0,5 0,0 0,5 1,0 1,5 2,0 Quadrature Inphase Single carrier and 2 Subcarriers Maximum experimental bitrates 40 Gbps at 28th May 201341 DWDM Fiber-Wireless Access Systems -53 -52 -51 -50 -49 -48 -47 -46 5 4 3 Received optical power [dBm] 8 12 16 20 24 28 32 36 40 44 4 Bit Rate [Gb/s] 5Gbaud@60GHz 40 Gbps at 100 GHz First experimental demonstration of 40 Gbps photonic generation and detection of mm-wave signals
  42. 42. Conclusion 28th May 201342 DWDM Fiber-Wireless Access Systems
  43. 43. Conclusion •Photonic technologies enable high capacity wireless links: • 100 Gbps wireless transmission • Generate and detect 40 Gbps at 100 GHz • High linearity analogue links based on phase-modulation and coherent detection • Compatible for DWDM PON 28th May 201343 DWDM Fiber-Wireless Access Systems •Future work • Move to sub-terahertz frequencies (200 GHz- 2000 GHz) • Integration of photonic and wireless devices • Incorporate into DWDM-PON
  44. 44. Acknowledgements OPSCODER project http://www.opscoder.fotonik.dtu.dk/ 28th May 201344 DWDM Fiber-Wireless Access Systems
  45. 45. You can find us at MetroAccessGroup Metro Access Photonics Engineering 28th May 201345 DWDM Fiber-Wireless Access Systems www.fotonik.dtu.dk/English.aspx MetroAccess DTU Fotonik

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