homodyne olt-onu design for access optical networks

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  • Homodyne OLT-ONU design for access opticalnetworks

    Josep M. Fa`bregaAdvisor: Josep Prat

    Department of Signal Theory and CommunicationsUniversitat Polite`cnica de Catalunya - BarcelonaTech

    jmfabrega@tsc.upc.edu

    May 17, 2010

    J. M. Fa`brega (UPC-BarcelonaTech) Homodyne OLT-ONU design May 2010 1 / 59

  • Outline

    Introduction

    State of the art

    Lock-In amplifier OPLL architecture

    Advances in phase diversity architecturesKarhunen-Loe`ve series expansion phase estimationTime switched phase diversity

    Simplified schemeDirect drive time switchingFuzzy data estimation

    ONU and OLT architectures

    Case studies

    Conclusions

    J. M. Fa`brega (UPC-BarcelonaTech) Homodyne OLT-ONU design May 2010 2 / 59

  • Introduction

    I Novel multimedia applicationsI Voice over IPI Video on demandI HDTV

    I User bit rate demand expected to be increasingI Nielsen law: bandwidth per user increments in a 50 % per yearI In 2020 each user would demand an average bandwidth of 1 Gb/s

    J. M. Fa`brega (UPC-BarcelonaTech) Homodyne OLT-ONU design May 2010 3 / 59

  • FTTH roadmap and tendencies in PONs

    Actual tendencies:I PON standardization bodies pushing towards high capacity

    systems by increasing the aggregate bit rate (10 Gb/s)I ONU operates at a very high bit rate in the opto-electronics

    transceivers just to use a small fraction of it ( 3 %)High power consumption!

    New philosophy proposed, exploiting the pure WDM dimensionJ. M. Fa`brega (UPC-BarcelonaTech) Homodyne OLT-ONU design May 2010 4 / 59

  • Towards this new philosopy

    Advantages DrawbacksIM-DD

    I Simplicity I sensitivityI optical filters selectivity

    Coherent

    I Use of advanced modulation formatsI Electrical filtering for channel selectionI Detection amplitude, phase and polarizationI Linear transformation optical electricalI Increase of sensitivity

    I Image frequency (heterodyne)I Phase noise (Homodyne)

    J. M. Fa`brega (UPC-BarcelonaTech) Homodyne OLT-ONU design May 2010 5 / 59

  • Thesis objectives

    I Identify current coherent systems architectures

    I Propose advanced architectures to fit with the specifications of passiveoptical networks.

    I Evaluate some of the advanced techniques by means of simulations andexperiments:

    I Optical Phase-Locked LoopsI Lock-In amplified PLL

    I Phase diversity receivers with zero intermediate frequencyI Karhunen-Loe`ve phase estimationI Time-switched phase diversity

    I Implement a fully working transceiver prototype

    I Research the published work on advanced access network architecturesand propose network scenarios to achieve ultra dense WDM operability

    I Experimentally demonstrate the integration of the transceiver prototypein the more promising network schemes

    J. M. Fa`brega (UPC-BarcelonaTech) Homodyne OLT-ONU design May 2010 6 / 59

  • Outline

    Introduction

    State of the art

    Lock-In amplifier OPLL architecture

    Advances in phase diversity architecturesKarhunen-Loe`ve series expansion phase estimationTime switched phase diversity

    Simplified schemeDirect drive time switchingFuzzy data estimation

    ONU and OLT architectures

    Case studies

    Conclusions

    J. M. Fa`brega (UPC-BarcelonaTech) Homodyne OLT-ONU design May 2010 7 / 59

  • Reminding about homodyne receivers

    eS(t) =

    PS exp(j(0t + S(t)

    ))ES(t) =

    PSe

    jS (t)

    eLO(t) =

    PLO exp(j(0t + LO(t)

    ))ELO(t) =

    PLOe

    jLO (t)

    I1(t) =

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