UPC-GCO
UPC-




                                       GCO
                                       Ultra-Dense, Transparen...
UPC   Optical access evolution



          GCO                                                       ngPON


            ...
UPC   Introduction



          GCO
        1000 wavelengts
        Low-speed
         ∙ Rb = BWu
         ∙ Lambda-to-the...
UPC   Introduction



          GCO
       Migration from TDM/WDM to pure WDM
       Ultra-dense WDM PONs
       ∙ Multipl...
UPC   Introduction



          GCO
       ∙ IM-DD systems limited by:
           Sensitivity
           Optical filters s...
UPC   Introduction

      DPSK


            GCO
      Downstream   Transceiver


                      IM or
            ...
UPC   Time Switching Phase Diversity Receiver



          GCO
        Phase diversity achieved by switching local
       ...
UPC   Time Switching Phase Diversity Receiver



                GCO
                                                     ...
Time Switching Phase & Polarization
UPC   Diversity Receiver




                GCO
                                     ...
UPC   Time Switching Phase Diversity Receiver



              GCO
      ES(t)                              I (t)         ...
UPC   Network topology and wavelength plan



             GCO
       Ring+trees PON (SARDANA-like)
                      ...
UPC   Central Office scheme



          GCO
       DFB lasers + splitters + switches + EDFA
       Double fiber architect...
UPC   WDM tree PON experiments



           GCO
       Transmission experiments at 1 Gbps
       DPSK modulation format
 ...
UPC   Experimental results



                             GCO
                            0

                            ...
UPC   Conclusions



            GCO
        A combined ring-tree access network
       topology has been demonstrated
   ...
UPC   Acknowledgements



          GCO
        Dr.-Ing. Ronald Freund (HHI)
        Dr. Carlos Bock (UEssex)




        ...
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Ultra-Dense, Transparent and Resilient Ring-Tree Access Network using Coupler-based Remote Nodes and Homodyne Transceivers

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We propose an Ultra-Dense Wavelength Division Multiplex Passive Optical Network (UD-WDM-PON) based on homodyne detection in a totally transparent ring-tree implementation. It is based on time switching phase diversity homodyne detection and local oscillator reuse for upstream transmission. 4 GHz spaced 1Gb/s streams were correctly received in a 30 km experimental deployment serving 1024 users.

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Ultra-Dense, Transparent and Resilient Ring-Tree Access Network using Coupler-based Remote Nodes and Homodyne Transceivers

  1. 1. UPC-GCO UPC- GCO Ultra-Dense, Transparent and Resilient Ring-Tree Access Network using Coupler-based Remote Nodes and Homodyne Transceivers Universitat Politècnica de Catalunya Josep M. Fabrega and Josep Prat jprat@tsc.upc.edu Universitat Politècnica de Catalunya (UPC) Dept. of Signal Theory and Communications (TSC) Optical Communications Group (GCO) www.tsc.upc.edu/gco
  2. 2. UPC Optical access evolution GCO ngPON FTTH ultra- COST dense WDM-PON FTTH WDM-PON FTTH-PtP FTTH FTTH TIME WDM&TDM-PON CATV xDSL G/E-PON CAPACITY ADSL POTs WDM - PON TIME
  3. 3. UPC Introduction GCO 1000 wavelengts Low-speed ∙ Rb = BWu ∙ Lambda-to-the-user WDM TIME Few wavelengths TDM High-speed ∙ Rb>>BWu ∙ Power consumption
  4. 4. UPC Introduction GCO Migration from TDM/WDM to pure WDM Ultra-dense WDM PONs ∙ Multiple low capacity channels E.g. 1 Gbps OL 3 GHz ........................... λ More than 1500 ch. at C band
  5. 5. UPC Introduction GCO ∙ IM-DD systems limited by: Sensitivity Optical filters selectivity λ LO 3 GHz ........................... λ Optical ∙ Coherent systems Input - I p(t) + Heterodyne – Image frequency problems Local Laser Homodyne – oPLL (phase lock problems) – IQ, Feed-Forward, Phase Diversity
  6. 6. UPC Introduction DPSK GCO Downstream Transceiver IM or PM - + Data Data and Phase recovery Local laser Data Receiver
  7. 7. UPC Time Switching Phase Diversity Receiver GCO Phase diversity achieved by switching local laser phase 3 dB penalty with respect to an ideal homodyne system due to the phase switching Several schemes proposed I Q I Q t t0 t0+T/2 t0+T t0+3T/2 t0+2T
  8. 8. UPC Time Switching Phase Diversity Receiver GCO I’ Tb/2 Optical Tb Input - Q’ + Tb 90º Phase 0º Vout Scrambler CLK Recovery Laser I’ + Vout Q’ Data out [1] J. Prat and J. M. Fabrega, ECOC 2005, Glasgow, Scotland, sept. 2005, paper We.P.104
  9. 9. Time Switching Phase & Polarization UPC Diversity Receiver GCO 3Tb/2 Optical Tb Input - Tb/2 + Tb V Tb/4 Pol. H Scrambler Tb Tb 90º freq. Phase 0º doubler Scrambler CLK Recovery Laser Data out [3] J. M. Fabrega and J. Prat, OFC 2006, Anaheim CA, March 2007, paper JThB45
  10. 10. UPC Time Switching Phase Diversity Receiver GCO ES(t) I (t) If(t) - P + ELO(t) Tb Tb/2 Phase CLK Scrambler 90º Recovery 0º Laser Transmission experiments (1Gbps) [2]: Data out • -38 dBm sensitivity @ BER 10 -9 • 18 MHz linewidth tolerance @ BER 10-3 • 100 MHz detuning tolerance • WDM Channel spacing of 3 GHz @ 1 dB Penalty BER 10-9 [2] J. M. Fabrega and J. Prat, OSA Optics Letters, vol. 32, no. 5, pp. 463-465, March 2007
  11. 11. UPC Network topology and wavelength plan GCO Ring+trees PON (SARDANA-like) x/y coupler x/y coupler RNn West 50/50 CO East RNn coupler RN2 RN1 CPE 1:K power splitter CPE 2 splitters CPE CPE CPE per RN 4 GHz CPE CPE .................. λ C band
  12. 12. UPC Central Office scheme GCO DFB lasers + splitters + switches + EDFA Double fiber architecture ∙ No Rayleigh Backscattering CO West Optical switch East Tx/Rx
  13. 13. UPC WDM tree PON experiments GCO Transmission experiments at 1 Gbps DPSK modulation format CO output power: 0 dBm Losses ∙ 30 km fiber spool 5.2 dB ∙ 4 Remote nodes 1.6 dB for pass-through 13.2 dB for drop ∙ Second distribution stage Emulated by means of a VOA 21 dB losses to the link 1:128 splitting ratio Overall splitting ratio: 4x2x128=1024 homes 0 -10 Power (dBm) -20 -30 -40 -50 -60 0 500 1000 1500 2000 Frequency (MHz)
  14. 14. UPC Experimental results GCO 0 RN1 -2 RN2 RN4 -4 lo g (B E R ) -6 BER floor due to -8 phase noise and mixer electronics. -10 FEC required for resilience -12 -52 -50 -48 -46 -44 -42 -40 -38 Pin (dBm) 10-9 (*10-6 ) Normal Operation Resilient mode RN1 RN2 RN4 RN1 RN2 RN4 Sensitivity -43 dBm -41.3 dBm -44.3 dBm* -40.8 dBm -41.6 dBm -40-2 dBm Link Losses 39.4 dB 41 dB 44.2 dB 44.2 dB 41 dB 39.4 dB PowerBudget 42.9 dB 41.2 dB -44.2 dBm 40.7 dB 41.5 dB 40.1 dB
  15. 15. UPC Conclusions GCO A combined ring-tree access network topology has been demonstrated ∙ Flexible, scalable ∙ large number of users (up to 1024 1024) ∙ Large capacity (more than 1 Tb/s) ∙ completely passive outside plant ∙ wavelength-transparent remote nodes GPON ODN compatible Transmission experiments at 1 Gb/s ∙ sensitivity of -43 dBm in RN1, after 30 km ∙ Power budget of 42.9 dB (49 dB at 10-3) ∙ 4 GHz channel spacing ∙ FEC is convenient for robutsness.
  16. 16. UPC Acknowledgements GCO Dr.-Ing. Ronald Freund (HHI) Dr. Carlos Bock (UEssex) Thanks!! jprat@tsc.upc.edu www.tsc.upc.edu/gco

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