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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Similar a Ultra-Dense, Transparent and Resilient Ring-Tree Access Network using Coupler-based Remote Nodes and Homodyne Transceivers
Similar a Ultra-Dense, Transparent and Resilient Ring-Tree Access Network using Coupler-based Remote Nodes and Homodyne Transceivers (20)
Ultra-Dense, Transparent and Resilient Ring-Tree Access Network using Coupler-based Remote Nodes and Homodyne Transceivers
- 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. 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. 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. 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. 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. UPC Introduction DPSK GCO Downstream Transceiver IM or PM - + Data Data and Phase recovery Local laser Data Receiver
- 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. 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. 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. 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. 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. UPC Central Office scheme GCO DFB lasers + splitters + switches + EDFA Double fiber architecture ∙ No Rayleigh Backscattering CO West Optical switch East Tx/Rx
- 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. 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. 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. UPC Acknowledgements GCO Dr.-Ing. Ronald Freund (HHI) Dr. Carlos Bock (UEssex) Thanks!! jprat@tsc.upc.edu www.tsc.upc.edu/gco