A WDM Passive Optical Network Architecture for Multicasting Services

1. A WDM Passive Optical Network Architecture for Multicasting Services Student：Tse-Hsien Lin Teacher：Ho-Ting WuDate：2005.05.31

2. Outline • Background • Motivations • A WDM Passive Optical Network Architecture • The Proposed Multicast Algorithm • Simulation • Future work • Conclusions • Reference

3. Background • PON • TDM PON • WDM PON

4. Passive Optical Network • In a PON, all components between the end users and the central office (CO) are passive, such as optical fibers and couplers

5. The TDM PON • In a TDM PON, end users share the bandwidth in time domain • In the CO, an optical line terminal (OLT) transmits the downstream traffic to the end users and manages the upstream traffic flows from the end users

6. The TDM PON

7. The WDM PON • What’s is WDM • At the same time, The fiber can carry Independent data streams on different wavelengths • WDM PONs create point-to-point links between the CO and end user, no sharing wavelength • Advantage • Scalable • High Capacity

8. Motivations • Network Environments • WDM Passive Optical Network • Wavelength Spatial Reused • Downstream • Multicast Transmission • Unicast Transmission • To Design a Multicast Scheduling Algorithm • Simple • Efficient • Scalable

9. Arrayed Waveguide Grating • The AWG is a wavelength-routing device • Every second wavelength is routed to the same output port • This period of the wavelength response is called free spectral range (FSR)

10. SUCCESS-DWA PON Architecture -Previous Works • TL = Tunable laser CH X = Thin-film WDM filter

11. Functional diagrams of the OLT and ONU Previous Works

12. A WDM Passive Optical Network Architecture • OLT use four tunable lasers to transmit control message on control channel or data packet on any wavelength • Each ONU consists of a tunable receiver which allow them to receive control message on a control channel (or data on any wavelength) • The multicast packet is received by the ONUs attached to the corresponding splitter • Each splitter equally distributes all incoming wavelengths to all attached receivers.

13. A WDM Passive Optical Network Architecture

14. TL Timing Structure • Each TL transmits control message which corresponded to the ONUs of the same AWG output port in the control time • Each TL transmits data packet to reach all ONUs attached to the same AWG output port in the data time • A control packet consists of four fields, destination address, guard time of each destination, wavelength, and offset time

15. TL Timing Structure

16. TL Timing Structure

17. Function Diagrams of the OLT and ONU

18. Function Diagrams of the OLT and ONU • Dispatch packet • Sequence • Random • Short Queue First • The Scheduler Multicast Algorithm was satisfied • Partition or without Partition • Receiver Collision

19. The Proposed Multicast Algorithm • An All-out Packet Is Defined to Be a Queued Packet with All of Its Intended Recipients Free and at the same AWG output port in the Scheduling Time

22. The scenario of multicast algorithm • The HOL packet of Queue 1 is all-out packet

23. Simulation (Unicast) • The parameters are N = 64 ONUs • The Tunable laser TLs = 4 • Packet generation follows the Poisson arrival process with parameter λ = 0.04~0.36 • The time slot = 12us • The Simulation during 1000000 slot time • TDM  Four-TDM-PON • DWA SUCCESS-DWA PON

24. Simulation (Unicast Packet Delay)

25. Simulation (Unicast Queue Depth)

26. Simulation (Multicast) • The parameters are N = 64 ONUs • The Tunable laser TLs = 4 • Packet generation follows the Poisson arrival process with parameter λ = 0.02~0.18 • The time slot = 12us • The destination nodes of a multicast packet are randomly selected among all ONU • The ONUs in the multicast size S are randomly chosen from the uniform distribution [1,5] • The Simulation during 250000 slot time

27. Simulation (S = 5 Packet Delay)

28. Simulation (S = 5 Queue Depth)

29. Proposed Multicast Scheduling Algorithms – LookBack Mechanism • Search for an All-out Packet in the Input Queue up to the Lookback Length L

30. Simulation (Multicast Length) • The parameters are N = 64 ONUs • The Tunable laser TLs = 4 • Packet generation follows the Poisson arrival process with parameter λ = 0.02~0.18 • The time slot = 12us • The destination nodes of a multicast packet are randomly selected among all ONU • The ONUs in the multicast size S are randomly chosen from the uniform distribution [1,5] • The LookBack Length L = 1,2,3,4,5,10,15,20,100,1000,10000,∞ • The Simulation during 250000 slot time

31. Multicast Length L =1~5 Packet Delay

32. Length L =10,15,20,100,1000,10000,Infinite Packet Delay

33. Future work • Performance Key • Packet delay • Receiver throughput

34. Conclusion • Proposed The Multicast Scheduling Mechanism for WDM Passive Optical Network

35. Reference • Ho-Ting Wu, Po-Hsin Hong, and Kai-Wei Ke, “On the Multicast Scheduling Mechanisms for Interconnected WDM Optical Network”, IEEE GLOBECOM 2003 • Martin Maiser, Michael Scheutzow, and Martin Reisslein, “The Arrayed-Waveguide Grating-Based Single-Hop WDM Network: An Architecture for Efficient Multicasting”, Select Areas in Communications, IEEE Journal , November 2003 • Yu-Li Hsueh, Matthew S. Rogge, Wei-Tao Shaw, and Leonid G. Kazovsky, “SUCCESS-DWA: A Highly Scalable and Cost-Effective Optical Access Network”, IEEE Optical Communication August 2004 • Glen Kramer and Gerry Pesavento, “Ethernet Passive Optical Access Network (EPON): Building a Next-Generation Optical Access Network”, IEEE Communications Magazine February 2002