Deployment Analysis of TDM/WDM Single Fiber PON with Colourless ONU operating at 2.5 Gbps Sub-Carrier Multiplexed Downstre...
Outline <ul><li>Introduction </li></ul><ul><li>SCM-DPSK modulation </li></ul><ul><li>Scenarios description </li></ul><ul><...
Introduction <ul><li>Next generation FTTH: </li></ul><ul><li>Migration from TDM-PON to hybrid WDM/TDM-PON </li></ul><ul><l...
Introduction <ul><ul><li>IM-IM systems </li></ul></ul><ul><ul><ul><li>High interference between upstream and downstream </...
SCM/DPSK – IM modulation MUX OLT ONU TX  SCM PSK RX  IM RX   DPSK rTX Down: SCM-DPSK Up:  IM 1.25 GHz 1.25Gb UP 2.5 GHz 2....
Experimental setup <ul><li>2.5 Gbps SCM-DPSK downstream </li></ul><ul><li>1.25 Gbps IM upstream </li></ul><ul><li>OLT opti...
SCM-DPSK modulation <ul><li>Mx: Double balanced mixer  </li></ul><ul><li>LO: VCO@ 5 GHz </li></ul><ul><li>BPF: bandpass fi...
Scenario 1: Low density of users <ul><li>27.2 km coverage, giving service to 8 users </li></ul><ul><ul><li>25 km feeder </...
Scenario 2: Medium density of users <ul><li>20.6 km coverage, giving service to 160 users </li></ul><ul><ul><li>16 km feed...
Scenario 3: Large density of users <ul><li>20.2 km coverage, giving service to 1280 users </li></ul><ul><ul><li>Double fib...
Experimental results Downstream sensitivity Upstream sensitivity 4 dB 4 dB 29.6 dB 29.6 dB -28.8 dBm -19.6 dBm Scenario 3 ...
Conclusions <ul><li>Demonstration of the bi-directional transmission of 2.5 Gbps/1.25 Gbps in a WDM-PON </li></ul><ul><ul>...
Thanks!! Josep M. Fàbrega jmfabrega@tsc.upc.edu
RSOA <ul><li>Uncooled </li></ul><ul><li>TO-CAN package </li></ul><ul><li>Characteristics: </li></ul><ul><ul><li>Bandwidth ...
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Deployment Analysis of TDM/WDM Single Fiber PON with Colourless ONU operating at 2.5 Gbps Sub-Carrier Multiplexed Downstream and 1.25 Gbps Upstream

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A single-fiber full-duplex hybrid TDM/WDM-PON is demonstrated to operate at 2.5/1.25 Gbps rates, with RSOA ONU. It achieves high power budget (GPON compliant) at a distances higher than 20km, and serves up to 1280 users.

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Deployment Analysis of TDM/WDM Single Fiber PON with Colourless ONU operating at 2.5 Gbps Sub-Carrier Multiplexed Downstream and 1.25 Gbps Upstream

  1. 1. Deployment Analysis of TDM/WDM Single Fiber PON with Colourless ONU operating at 2.5 Gbps Sub-Carrier Multiplexed Downstream and 1.25 Gbps Upstream J. M. Fàbrega , V. Polo, J. A. Lázaro, E.T. López, and J. Prat Universitat Politècnica de Catalunya (UPC) Jordi Girona D5; 08034 Barcelona, Spain A. El Mardini, and R. Soila Tellabs Inc. 18581, North Dallas Parkway, Dallas, TX 75287 USA [email_address]
  2. 2. Outline <ul><li>Introduction </li></ul><ul><li>SCM-DPSK modulation </li></ul><ul><li>Scenarios description </li></ul><ul><ul><li>Large coverage with low number of users </li></ul></ul><ul><ul><li>Medium coverage </li></ul></ul><ul><ul><li>Large density of users </li></ul></ul><ul><li>Experiments </li></ul><ul><li>Conclusions </li></ul>
  3. 3. Introduction <ul><li>Next generation FTTH: </li></ul><ul><li>Migration from TDM-PON to hybrid WDM/TDM-PON </li></ul><ul><li>Key features for cost-effective implementation: </li></ul><ul><ul><li>Single fiber, bidirectional transmission </li></ul></ul><ul><ul><ul><li>External Fibre-Plant reduced </li></ul></ul></ul><ul><ul><ul><li>Connection management of the outside plant simplified </li></ul></ul></ul><ul><ul><li>Colourless Reflective ONU </li></ul></ul><ul><ul><ul><li>No laser source at ONU </li></ul></ul></ul><ul><ul><ul><li>No stabilization neither inventory problems </li></ul></ul></ul>
  4. 4. Introduction <ul><ul><li>IM-IM systems </li></ul></ul><ul><ul><ul><li>High interference between upstream and downstream </li></ul></ul></ul><ul><ul><ul><li>Extinction Ratio management </li></ul></ul></ul><ul><ul><li>SCM(DPSK)-IM </li></ul></ul><ul><ul><ul><li>Upstream and downstream signal use different electrical spectra channels </li></ul></ul></ul><ul><ul><ul><li>Electrical orthogonality between upstream and downstream </li></ul></ul></ul><ul><ul><ul><li>Reduced interference between upstream and downstream </li></ul></ul></ul><ul><ul><ul><li>Simple compatibility with GPON electronics. </li></ul></ul></ul>
  5. 5. SCM/DPSK – IM modulation MUX OLT ONU TX SCM PSK RX IM RX DPSK rTX Down: SCM-DPSK Up: IM 1.25 GHz 1.25Gb UP 2.5 GHz 2.5Gb 1.25 GHz 1.25Gb UP 5 GHz 2.5Gb DOWN fe t t 1.25 GHz 5 GHz 1.25Gb 2.5Gb UP fe 2.5 GHz 2.5Gb
  6. 6. Experimental setup <ul><li>2.5 Gbps SCM-DPSK downstream </li></ul><ul><li>1.25 Gbps IM upstream </li></ul><ul><li>OLT optically preamplified </li></ul><ul><li>3 scenarios </li></ul><ul><ul><li>Low density of users </li></ul></ul><ul><ul><li>Medium density of users </li></ul></ul><ul><ul><li>Large density of users </li></ul></ul>
  7. 7. SCM-DPSK modulation <ul><li>Mx: Double balanced mixer </li></ul><ul><li>LO: VCO@ 5 GHz </li></ul><ul><li>BPF: bandpass filter, </li></ul><ul><ul><li>centered at 5 GHz </li></ul></ul><ul><ul><li>about 4-5 GHz BW. </li></ul></ul><ul><ul><li>Important: > 20 dB att @ 1.25 GHz </li></ul></ul><ul><li>LPF: Lowpass filter, </li></ul><ul><ul><li>For “matched” filtering (~2GHz BW) </li></ul></ul><ul><li>T b : Delay of 1 bit </li></ul>Data TX LO Mx T b Mx to MZM Data RX BPF LPF all electrical components commercially available
  8. 8. Scenario 1: Low density of users <ul><li>27.2 km coverage, giving service to 8 users </li></ul><ul><ul><li>25 km feeder </li></ul></ul><ul><ul><li>1:8 splitter </li></ul></ul><ul><ul><li>2.2 km drop </li></ul></ul><ul><li>Total network losses measured to be 16 dB </li></ul><ul><li>ONU input power of -16 dBm </li></ul><ul><li>ONU output power of +1 dBm </li></ul><ul><li>0 dBm injected from the OLT </li></ul><ul><li>Measured Rayleigh Backscattering (RB) of -33.5 dBm (17.5 dB OSRR). </li></ul>
  9. 9. Scenario 2: Medium density of users <ul><li>20.6 km coverage, giving service to 160 users </li></ul><ul><ul><li>16 km feeder spool </li></ul></ul><ul><ul><li>1:40 AWG demultiplexer </li></ul></ul><ul><ul><li>2.4 km distribution spool </li></ul></ul><ul><ul><li>1:4 power splitter </li></ul></ul><ul><ul><li>2.2 km drop spool </li></ul></ul><ul><li>Total network losses measured to be 16.4 dB. </li></ul><ul><li>ONU: input power of -16.4 dBm, output power of +0.8 dBm </li></ul><ul><li>0 dBm injected from the OLT to the feeder fiber </li></ul><ul><li>Generated RB of -33.5 dBm (17.5 dB of upstream oSRR) </li></ul>
  10. 10. Scenario 3: Large density of users <ul><li>20.2 km coverage, giving service to 1280 users </li></ul><ul><ul><li>Double fiber feeder is proposed against Rayleigh Backscattering </li></ul></ul><ul><ul><li>2 x 16 km feeder spools </li></ul></ul><ul><ul><li>1x40 AWG demultiplexer </li></ul></ul><ul><ul><li>2.4 km distribution spool </li></ul></ul><ul><ul><li>1:32 power splitter </li></ul></ul><ul><ul><li>2.2 km drop spool </li></ul></ul><ul><li>Total network losses measured to be 26.6 dB </li></ul><ul><li>ONU: input power of -16.6 dBm, output power of +0.8 dBm </li></ul><ul><li>OLT output power of +10 dBm. </li></ul>
  11. 11. Experimental results Downstream sensitivity Upstream sensitivity 4 dB 4 dB 29.6 dB 29.6 dB -28.8 dBm -19.6 dBm Scenario 3 3.4 dB 4.2 dB 19.8 dB 20.6 dB -19 dBm -20.6 dBm Scenario 2 3.4 dB 4.1 dB 19.4 dB 20.1 dB -18.4 dBm -20.1 dBm Scenario 1 Upstream system margin Downstream system margin Upstream power budget Downstream power budget Upstream sensitivity Downstream sensitivity
  12. 12. Conclusions <ul><li>Demonstration of the bi-directional transmission of 2.5 Gbps/1.25 Gbps in a WDM-PON </li></ul><ul><ul><li>Downstream signal DPSK coded, operating at 5 GHz subcarrier </li></ul></ul><ul><li>Three deployment scenarios analyzed: </li></ul><ul><ul><li>Large coverage are and low density of users </li></ul></ul><ul><ul><li>Area with medium density of users </li></ul></ul><ul><ul><li>Improved access network: large density of users </li></ul></ul><ul><li>Scenarios 1, 2 show a network power budget of 20 dB </li></ul><ul><ul><li>Limited by Rayleigh Backscattering </li></ul></ul><ul><ul><li>Covering up to 160 users </li></ul></ul><ul><li>Scenario 3 exhibits a power budget of 29 dB </li></ul><ul><ul><li>Rayleigh Backscattering negligible </li></ul></ul><ul><ul><li>Covering up to 1280 users </li></ul></ul><ul><li>All cases with power margin > 3 dB </li></ul>
  13. 13. Thanks!! Josep M. Fàbrega jmfabrega@tsc.upc.edu
  14. 14. RSOA <ul><li>Uncooled </li></ul><ul><li>TO-CAN package </li></ul><ul><li>Characteristics: </li></ul><ul><ul><li>Bandwidth 1 GHz </li></ul></ul><ul><ul><li>ER > 6 dB </li></ul></ul><ul><ul><li>Small signal gain: ~18 dB </li></ul></ul><ul><ul><li>Noise figure 8.5 dB </li></ul></ul>16.7 15.8 14.9 Gain (dB) @ 1560nm 19.6 18.7 17.6 Gain (dB) @ 1545nm 19.6 18.4 16.7 Gain (dB) @ 1530nm 80 70 60 Bias Current (mA)

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