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Deployment Analysis of TDM/WDM Single Fiber PON with Colourless ONU operating at 2.5 Gbps...

Date post:09-Jun-2015
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Description:
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.
Transcript:
  • 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. Fbrega , V. Polo, J. A. Lzaro, E.T. Lpez, and J. Prat Universitat Politcnica 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. Outline

  • Introduction
  • SCM-DPSK modulation
  • Scenarios description
    • Large coverage with low number of users
    • Medium coverage
    • Large density of users
  • Experiments
  • Conclusions

3. Introduction

  • Next generation FTTH:
  • Migration from TDM-PON to hybrid WDM/TDM-PON
  • Key features for cost-effective implementation:
    • Single fiber, bidirectional transmission
      • External Fibre-Plant reduced
      • Connection management of the outside plant simplified
    • Colourless Reflective ONU
      • No laser source at ONU
      • No stabilization neither inventory problems

4. Introduction

    • IM-IM systems
      • High interference between upstream and downstream
      • Extinction Ratio management
    • SCM(DPSK)-IM
      • Upstream and downstream signal use different electrical spectra channels
      • Electrical orthogonality between upstream and downstream
      • Reduced interference between upstream and downstream
      • Simple compatibility with GPON electronics.

5. SCM/DPSK IM modulation MUX OLT ONU TXSCM PSK RXIM 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. Experimental setup

  • 2.5 Gbps SCM-DPSK downstream
  • 1.25 Gbps IM upstream
  • OLT optically preamplified
  • 3 scenarios
    • Low density of users
    • Medium density of users
    • Large density of users

7. SCM-DPSK modulation

  • Mx: Double balanced mixer
  • BPF: bandpass filter,
    • centered at 5 GHz
    • about 4-5 GHz BW.
    • Important: > 20 dB att @ 1.25 GHz
  • LPF: Lowpass filter,
    • For matched filtering (~2GHz BW)
  • T b : Delay of 1 bit

Data TX LO Mx T b Mx to MZM Data RX BPF LPF all electrical components commercially available 8. Scenario 1: Low density of users

  • 27.2 km coverage, giving service to 8 users
    • 25 km feeder
    • 1:8 splitter
    • 2.2 km drop
  • Total network losses measured to be 16 dB
  • ONU input power of -16 dBm
  • ONU output power of +1 dBm
  • 0 dBm injected from the OLT
  • Measured Rayleigh Backscattering (RB) of -33.5 dBm (17.5 dB OSRR).

9. Scenario 2: Medium density of users

  • 20.6 km coverage, giving service to 160 users
    • 16 km feeder spool
    • 1:40 AWG demultiplexer
    • 2.4 km distribution spool
    • 1:4 power splitter
    • 2.2 km drop spool
  • Total network losses measured to be 16.4 dB.
  • ONU: input power of -16.4 dBm, output power of +0.8 dBm
  • 0 dBm injected from the OLT to the feeder fiber
  • Generated RB of -33.5 dBm (17.5 dB of upstream oSRR)

10. Scenario 3: Large density of users

  • 20.2 km coverage, giving service to 1280 users
    • Double fiber feeder is proposed against Rayleigh Backscattering
    • 2 x 16 km feeder spools
    • 1x40 AWG demultiplexer
    • 2.4 km distribution spool
    • 1:32 power splitter
    • 2.2 km drop spool
  • Total network losses measured to be 26.6 dB
  • ONU: input power of -16.6 dBm, output power of +0.8 dBm
  • OLT output power of +10 dBm.

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. Conclusions

  • Demonstration of the bi-directional transmission of 2.5 Gbps/1.25 Gbps in a WDM-PON
    • Downstream signal DPSK coded, operating at 5 GHz subcarrier
  • Three deployment scenarios analyzed:
    • Large coverage are and low density of users
    • Area with medium density of users
    • Improved access network: large density of users
  • Scenarios 1, 2 show a network power budget of 20 dB
    • Limited by Rayleigh Backscattering
    • Covering up to 160 users
  • Scenario 3 exhibits a power budget of 29 dB
    • Rayleigh Backscattering negligible
    • Covering up to 1280 users
  • All cases with power margin > 3 dB

13. Thanks!! Josep M. Fbrega [email protected] 14. RSOA

  • Uncooled
  • TO-CAN package
  • Characteristics:
    • Bandwidth 1 GHz
    • ER > 6 dB
    • Small signal gain: ~18 dB
    • Noise figure 8.5 dB

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