FTTH Conference 2011 Workshop The Way to 1 Gbps POF Home Networks Alexander Bunge HfTL

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FTTH Conference 2011 Workshop The Way to 1 Gbps POF Home Networks Alexander Bunge HfTL

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FTTH Conference 2011 Workshop The Way to 1 Gbps POF Home Networks Alexander Bunge HfTL

  1. 1. The Way to 1-Gbit/s POF Home NetworksThe Work of the International Standardisation Group DKE 412.7.1Prof. Dr.-Ing. Christian-Alexander BungeHochschule für Telekommunikation Leipzigbunge@hft-leipzig.de
  2. 2. Basic facts about the group and the goals
  3. 3. Basic facts about the group and the goals 1 Gbit/s over up to 50 m 1-mm standard step-index POF (IEC 60793-2 A4a.2) eye safety, easy installation…
  4. 4. Basic facts about the group and the goals 1 Gbit/s over up to 50 m 1-mm standard step-index POF (IEC 60793-2 A4a.2) eye safety, easy installation… Goals: definition of „VDE Anwenderregel“ for Gigabit Ethernet over POF contributions to standardization bodies like, e.g., ETSI, IEC, IEEE
  5. 5. Participants (selection)
  6. 6. Meetings of the group thus far 9/2009: Berlin 10/2009: Frankfurt/Main 12/2009: Munich 2/2010: Nürnberg 4/2010: Frankfurt/Main 6/2010: Munich 8/2010: Leipzig 11/2010: Berlin 1/2011: Berlin
  7. 7. Meetings of the group thus far 9/2009: Berlin 10/2009: Frankfurt/Main 12/2009: Munich 2/2010: Nürnberg about 1 meeting 4/2010: Frankfurt/Main per 2 months 6/2010: Munich 8/2010: Leipzig 11/2010: Berlin 1/2011: Berlin
  8. 8. Main issues
  9. 9. Bandwidth of the POF electrical frequency response of 50m POF channel
  10. 10. Attenuation of the POFAttenuation [dB/m] Wavelength [nm]
  11. 11. Attenuation of the POFAttenuation [dB/m] Wavelength [nm]
  12. 12. Attenuation of the POFAttenuation [dB/m] Wavelength [nm]
  13. 13. Power Budget (working numbers) fiber coupled launch power 0.0 dBm LED aging/temperature -3.0 dB 50m fiber attenuation -9.0 dB spectral loss -3.0 dB two connectors (2 dB each) -4.0 dB photodiode coupling -2.0 dB margin -3.0 dB required sensitivity -24.0 dBm
  14. 14. Transmitter
  15. 15. Transmitter LED robust, but slow and non-linear
  16. 16. Transmitter LED robust, but slow and non-linear RC-LED faster, good compromise, but availability?
  17. 17. Transmitter LED robust, but slow and non-linear RC-LED faster, good compromise, but availability? VCSEL linear, but lifetime, eye safety, availability difficult driver circuitry
  18. 18. Receiver Si photo diode responsivity R=0.5 A/W large diameter (<= 1 mm) coupling losses capacity, bandwidth transimpedence amplifier has to be adapted to sampling rate
  19. 19. Modulation schemes
  20. 20. Non-Return to Zero (NRZ) with equalisation sampling rate full 1 Gbit/s only two levels, no nonlinearity issues sophisticated equalisation (dynamic range)
  21. 21. Non-Return to Zero (NRZ) with equalisation sampling rate full 1 Gbit/s only two levels, no nonlinearity issues sophisticated equalisation (dynamic range) but possible (e.g. NRZ w/ DFE, POF-AC 2010):
  22. 22. Receiver Architecture for NRZ with decision feedbackequalizer (DFE) single-chip implementation laboratory version: adaptation algorithm performed on PC optional: replace HP by FFE (feed forward equalizer) Fraunhofer IIS, 2010
  23. 23. Real-time measurement results at 1.25 Gbit/s channel setup: POF length: 50 m 4QW RCLED+ driver; receiver: ARX31125 results: BER < 10-3 without FEC -> error free with FEC estimated receiver chip size in 90 nm CMOS (including FEC): Total: ≈1 mm2 transmitter chip size in 90 nm CMOS: FEC encoder, driver & control circuitry: < 5 mm2 for an integrated solution
  24. 24. Pulse-Amplitude Modulation (m-PAM) lower sampling rate: log2(m) lower symbol rate nonlinear characteristics of components crest factor of the signal increases
  25. 25. Bandwidth efficient: 100 MHz over 275 m POF R. Gaudino et al.: Advanced modulation format for high speed transmission over standard SI-POF using DSP/FPGA platforms. POF ’2004, Nürnberg, 27.–30.9.2004, pp. 98–105.
  26. 26. Discrete Multitone Transmission (DMT) many sub-carriers (often >512) optimum choice of modulation format per SC but high-crest factor signal processing at Tx and RxS. Loquai et al.:10.7-Gb/s Discrete Multitone Transmission Over 25-m Bend-Insensitive Multicore Polymer Optical Fiber, PTL, Vol. 22, No. 21, 2010.
  27. 27. Comparison of the transmission schemes
  28. 28. Efficiency of transmission and detection schemeS. Randel, C.-A. Bunge: Spectrally Efficient Polymer Optical Fiber Transmission, Photonics West 2011
  29. 29. Experimental results: NRZ vs PAM-4
  30. 30. Current status
  31. 31. Transmission scheme
  32. 32. Transmission scheme agreement to start with following assumption m-PAM transmission (m>4)
  33. 33. Transmission scheme agreement to start with following assumption m-PAM transmission (m>4) discussion on the equalisation scheme (error propagation) FFE-DFE or Tomlinson-Harashima pre-coding
  34. 34. Transmission scheme agreement to start with following assumption m-PAM transmission (m>4) discussion on the equalisation scheme (error propagation) FFE-DFE or Tomlinson-Harashima pre-coding frame structure training sequence transmission of physical parameters
  35. 35. Passive optical interface
  36. 36. Passive optical interface development of measurement methods power distribution standardised excitation conditions connector-loss measurements bandwidth measurement
  37. 37. Passive optical interface development of measurement methods power distribution standardised excitation conditions connector-loss measurements bandwidth measurement generation of standardised excitation conditions
  38. 38. Passive optical interface development of measurement methods power distribution standardised excitation conditions connector-loss measurements bandwidth measurement generation of standardised excitation conditions collaboration within IEC with Japanese activity
  39. 39. Evolution of the standard
  40. 40. Evolution of the standard 1st phase: fast market entrance (private customers) existing technologies lower requirements: approx. 25 m, no connectors??
  41. 41. Evolution of the standard 1st phase: fast market entrance (private customers) existing technologies lower requirements: approx. 25 m, no connectors?? 2nd phase: fulfillment of all requirements (professional) use of progress mainly for power budget
  42. 42. Evolution of the standard 1st phase: fast market entrance (private customers) existing technologies lower requirements: approx. 25 m, no connectors?? 2nd phase: fulfillment of all requirements (professional) use of progress mainly for power budget 3rd phase: evolution longer lengths or higher bitrates???
  43. 43. Interested? next meeting will be March 17th in Nürnberg at POF-AC further information on the website http://www.vde.com/en/dke/std/projects/POF/Pages/ default.aspx contact: T. Sentko: thomas.sentko@vde.com C.-A. Bunge: bunge@hft-leipzig.de O. Ziemann: olaf.ziemann@pofac.ohm-hochschule.de

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