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Designs of AWG-Based WDM/TDM PON Architecture

Explore the design of a Wavelength Division Multiplexing/Time Division Multiplexing Passive Optical Network (WDM/TDM PON) using Arrayed Waveguide Grating (AWG) technology. The study proposes a multicast algorithm, evaluates performance, discusses upgrade mechanisms, and examines the architecture under limited wavelength restraints.

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Designs of AWG-Based WDM/TDM PON Architecture

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  1. 以AWG為基礎之分波多工/分時多工被動式光學網路架構之設計The Designs of AWG Based WDM/TDM PON Architecture Student: Ze-Yang Kuo (郭澤洋) Adviser: Ho-Ting Wu (吳和庭) Date: 2008/12/10 Institute of Computer Science and Information Engineering National Taipei University of Technology

  2. Outline • Background and Motivation • Propose Multicast Algorithm for WDM/TDM PON Architecture • Pure Look Back • Emergency and Ratio Look Back • Performance Evaluation • Upgrade Mechanisms • 16 x 16 AWG Based • 8 x 8 AWG Based • Performance Evaluation • Propose WDM/TDM PON Architecture and Upgrade Mechanisms under Limited Wavelength Environment • One Tunable Receiver • Receive Array • Performance Evaluation • Conclusion and Future Works • Reference

  3. Passive Star Coupler (PSC) • Broadcast-and-Select Device • Power Loss • Increase if add output port • Private • Low • Wavelength Reuse • None

  4. Arrayed Waveguide Grating (AWG) • Wavelength Static Routing Device • Power Loss • 6 to 8 dB • Private • High • Wavelength Reuse • Free Spectral Range (FSR)

  5. Time-Division-Multiplexing Passive Optical Network (TDM PON) • Composed of OLT, Splitter/combiner, ONU • Share one wavelength • Downstream • Point-to-MultiPoint • Broadcast • Upstream • MultiPoint-to-Point • Time Slot • Logic Link ID (LLID) • Low cost • Low bandwidth

  6. TDM PON Architecture

  7. Wavelength-Division-Multiplexed Passive Optical Network (WDM PON) • Composed of OLT, ONU, and • PSC (Splitter/Combiner) • AWG • Dedicated Wavelength • Waste wavelength when ONU idle • High cost • Huge bandwidth

  8. Stanford University Access-Dynamic Wavelength Allocation PON (SUCCESS-DWA PON)

  9. WDM/TDM PON for Multicast Service • OLT • Tunable Laser • AWG • ONU • Tunable Receiver • Packet • Control message • Data packet • Avoid collision • Partition

  10. WDM/TDM PON Architecture

  11. Motivation • Propose Multicast Algorithm for WDM/TDM Architecture • Power loss less than PSC • Support multicast with consider priority • Satisfy different performance demand • Upgrade Mechanisms • Best upgrade mechanisms • Propose WDM/TDM Architecture and Upgrade Mechanisms under Limited Wavelength Environment • Efficient wavelength reuse

  12. Outline • Background and Motivation • Propose Multicast Algorithm for WDM/TDM PON Architecture • Pure Look Back • Emergency and Ratio Look Back • Performance Evaluation • Upgrade Mechanisms • 16 x 16 AWG Based • 8 x 8 AWG Based • Performance Evaluation • Propose WDM/TDM PON Architecture and Upgrade Mechanisms under Limited Wavelength Environment • One Tunable Receiver • Receive Array • Performance Evaluation • Conclusion and Future Works • Reference

  13. WDM/TDM PON Architecture

  14. TL Time Structure • Control Time • Control message • Destination address • Transmission time • Wavelength information • Delay time • Data Time • Data packet

  15. TL Time Structure

  16. WDM/TDM PON Function Diagram of Packet Dispatcher

  17. The Proposed Multicast Algorithm • All Out Packet • A packet collision free and all destinations at the same AWG output port in the Scheduling Time • Partition • A packet with collision or destinations at different AWG output port in the Scheduling Time • Look Back Length • The packet number can selected form Head Of Line(HOL) packet • Pure Look Back • First All Out Packet • Emergency and Ratio Look Back • Consider output ratio if TTL large enough • Collision free destinations number / Total destinations number

  18. Pure Look Back (PLB)

  19. Emergency and Ratio Look Back (ERLB)

  20. Packet Definition • Unicast Packet • Just has one destination • Multicast Packet • Single PON Packet • More than one destination, and all destinations at the same AWG output port • Multi PON Packet • More than one destination, and destinations at different AWG output port • General Packet • Single PON Packet • Cause of receive collision • Multi PON Packet • Cause of receive collision or destinations at different AWG output • Original Packet • Destination frame without any modify

  21. Loading Definition • System Load • Offered Load As Source • Offered Load As Receiver

  22. 8-TDM Architecture

  23. Simulation Environment

  24. Performance Evaluation • PacketDroppedRatio • General Packet • MulticastFailedRatio • Original Packet • RcvrDroppedRatio • General Packet

  25. Look Back Length Effect(PLB)

  26. Look Back Length Effect(PLB)

  27. Look Back Length Effect(ERLB)

  28. Look Back Length Effect(ERLB)

  29. Look Back Length Effect(ERLB)

  30. Look Back Length Effect(ERLB)

  31. Look Back Length Effect(ERLB)

  32. WDM-PLB vs WDM-ERLB vs 8-TDM

  33. WDM-PLB vs WDM-ERLB vs 8-TDM

  34. WDM-PLB vs WDM-ERLB vs 8-TDM

  35. WDM-PLB vs WDM-ERLB vs 8-TDM

  36. WDM-PLB vs WDM-ERLB vs 8-TDM

  37. WDM-PLB vs WDM-ERLB vs 8-TDM

  38. Outline • Background and Motivation • Propose Multicast Algorithm for WDM/TDM PON Architecture • Pure Look Back • Emergency and Ratio Look Back • Performance Evaluation • Upgrade Mechanisms • 16 x 16 AWG Based • 8 x 8 AWG Based • Performance Evaluation • Propose WDM/TDM PON Architecture and Upgrade Mechanisms under Limited Wavelength Environment • One Tunable Receiver • Receive Array • Performance Evaluation • Conclusion and Future Works • Reference

  39. Upgrade Mechanisms • 16 x 16 AWG Based • Intuition • Eight ONUs in each group • Reduce collision probability • Increase partition probability • Wavelength heavy use • 8 x 8 AWG Based • Use eight wavelength • Channel collision • Use sixteen wavelength • Channel collision free • Wavelength heavy use

  40. 16 x 16 AWG Based Upgrade Architecture

  41. 8 x 8 AWG Based Upgrade Architecture

  42. Simulation Environment

  43. Three Upgrade Mechanisms Compare

  44. Three Upgrade Mechanisms Compare

  45. Three Upgrade Mechanisms Compare

  46. Outline • Background and Motivation • Propose Multicast Algorithm for WDM/TDM PON Architecture • Pure Look Back • Emergency and Ratio Look Back • Performance Evaluation • Upgrade Mechanisms • 16 x 16 AWG Based • 8 x 8 AWG Based • Performance Evaluation • Propose WDM/TDM PON Architecture and Upgrade Mechanisms under Limited Wavelength Environment • One Tunable Receiver • Receive Array • Performance Evaluation • Conclusion and Future Works • Reference

  47. WDM/TDM PON Architecture under Limited Wavelength Environment • Increase wavelength reuse ratio • Do not waste wavelength • Fixed Transmitter • Two kinds of receiver • One tunable receiver • Receive array

  48. WDM/TDM PON Architecture under Limited Wavelength Environment

  49. Simulation Environment

  50. TR Performance Evolution

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