A WDM Passive Optical Network Architecture for Multicasting Services

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A WDM Passive Optical Network Architecture for
Multicasting Services
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Outline

• Motivations
• Backgrounds
• A novel WDM Passive Optical Network Architecture
• The Proposed Multicast Algorithm
• Simulation results
• Scalability problem
• Conclusions
• Future works

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Motivations

• Network Environments
• Combined PSC and AWG
• WDM Passive Optical Network
• Downstream
• Multicast Transmission
• Unicast Transmission
• To Design a Multicast Scheduling Algorithm
• Simple
• Efficient

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Backgrounds

• Optical Devices
• PSC
• AWG
• Passive Optical Networks
• TDM PON
• WDM PON
• SUCCESS-DWA PON

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Optical Device-PSC

• The Passive Star Couple is a passive multiport
  device
• Wavelengths launched onto any input port are
  broadcast to every output port

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Optical Device-PSC

• The PSC is the preferred device to single-hop WDM
  networks
• broadcast-and-select single-hop WDM network
• TDM PON
• Advantages
• Broadcast signal
• Low cost
• Disadvantages
• Power loss
• Do not wavelength spatial reused

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Optical Device-AWG

• The AWG is passive wavelength routing device
• The same wavelength into any input port are
  routed to different output port
• This period of the wavelength response is called
  free spectral range (FSR)

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The application of AWG device
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Optical Device-AWG

• Advantages
• Static wavelength routing
• Wavelength spatial reused
• No power loss
• Disadvantages
• No broadcast channel

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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
• TDM PON
• WDM PON
• SUCCESS-DWA PON

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The TDM PON

• In a Time-Division-Multiplexing PON, end users
  share the bandwidth in time domain
• In the CO, an optical line terminal (OLT)
  transmits the downstream traffic to optical
  network unit (ONU) and manages the upstream
  traffic flows from the ONUs

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The TDM PON
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The WDM PON

• Whats is Wavelength-Division-Multiplexing
• At the same time, a single fiber can carry
  Independent data streams on different wavelengths
• WDM PONs create point-to-point links between the
  CO and end user, no shared wavelength
• Advantages
• High Capacity
• Scalable

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SUCCESS-DWA PON Architecture
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Functional diagrams of the OLT and ONU
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Proposed WDM Passive Optical Network Architecture

• Downstream Splitter
• Upstream Combiner

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Downstream mode

• 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.

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Downstream mode
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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 three fields,
  destination address, wavelength, and offset time

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TL Timing Structure
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Functional Diagrams of the OLT and ONU -
Downstream mode
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Functional Diagrams of the OLT and ONU -
Downstream mode

• Dispatch Mechanism
• Sequential
• Random
• Short Queue First
• The Criteria for whether to Partition Multicast
  Packets depend on
• Multiple AWG Outputs ?
• Receiver Collision ?

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The Proposed Multicast Algorithm

• An All-Out Packet Is Defined to Be a Queued HOL
  Packet with All of Its Intended Recipients Free
  and at the same AWG output port in the Scheduling
  Time

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The scenario of multicast algorithm

• The HOL packet of Queue 1 is all-out packet

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Simulation Parameters (Unicast)

• The parameters are N 64 ONUs
• The Tunable laser TLs 4
• Packet generation follows the Poisson arrival
  process
• Mean arrival rate 0.484.32 packets/slot
• Bandwidth 1Gbps
• Packet Size 1518 bytes
• Time slot 12 us
• The Simulation during 1000000 slot time
• TDM ? Four-TDM-PON
• DWA ? SUCCESS-DWA PON

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Unicast Average Packet Delay

• Average packet delay defined as the average time
  from the generation of a packet until the
  completion of the multicast transmission

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Simulation Parameters (Multicast)

• Packet generation follows the Poisson arrival
  process
• Mean arrival rate 0.122.28 packets/slot
• Bandwidth 1Gbps
• The time slot 12us
• Packet size 1518 bytes
• The destination nodes of a multicast packet are
  randomly selected among all ONU
• Mean multicast throughput is defined to be the
  mean number of All-Out packets in the average
  time slot

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Simulation Parameters
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Number of TLs OLT????????? TL
Number of ONUs ONU??? ONU
Mean Multicast Size ????????? ES
D x D AWG AWG?????????? AWG
???? ??
DWA SUCCESS-DWA PON
PON Short Queue First of WDM PON
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Simulation Results (Multicast)

• Comparison with different PON

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Simulation Results (Multicast)

• Comparison with different Mean multicast size ES

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Scalability Problem

• Expanding ONUs
• Expanding TLs of the OLT
• Comparisons with different AWG ports
• 4 x 4 AWG port
• 8 x 8 AWG port

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Expanding ONU
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Expand TL of the OLT (1/2)
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Expand TL of the OLT (2/2)
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Simulation results
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Conclusions

• Proposed The Multicast Scheduling Mechanism for
  WDM Passive Optical Network
• Compare our proposed WDM PON with SUCCESS-DWA PON
• Scalability problem Study
• ONU
• FSR

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Future works

• Keep solving the scalability problem
• The upstream issue
• Compare with the AWG based Single-Hop WDM network
  and our proposed WDM network architecture

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• THE END

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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

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TL Timing Structure
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Unicast Average Queue length

• Average Queue length defined as the average queue
  size of the queues in the average time slot

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Introduction

• Optical devices
• Passive star couple vs. Arrayed-waveguide grating
• Passive Optical Network
• TDM PON vs. WDM PON
• SUCCESS-DWA PON
• Our proposed WDM PON
• The proposed downstream multicast algorithm
• Receiver collision
• Partition
• Scalability problem
• Expand ONUs
• Expand TLs and AWG