SUCCESS-DWA: A Highly Scalable and Cost-Effective Optical Access Network
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Transcript of SUCCESS-DWA: A Highly Scalable and Cost-Effective Optical Access Network
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SUCCESS-DWA: A Highly Scalable and Cost-Effective Optical Access Network
Speaker: Tse-Hsien Lin
Teacher: Ho-Ting Wu
Date: 93.10.21
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Outline
Overview SUCCESS-DWA PON Architecture
Stanford University Access – Dynamic Wavelength Allocation
The Upstream Scenario Performance Wavelength Plan Conclusions
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Overview
Passive Optical Network (PON) The Time-Division Multiplexed (TDM)
PON The Wavelength-Division Multiplexed
(WDM) PON Arrayed Waveguide Grating (AWG)
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Passive Optical Network
In a PON, all components between the end users and the central office (CO) are passive
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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
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The TDM PON
Downstream The traffic is broadcast in nature Each Optical network unit (ONU) receives
a copy of the downstream data, extracts only the traffic targeting itself
Upstream Traffic from the ONUs to the OLT is centr
ally scheduled by the OLT
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The TDM PON
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The WDM PON
What’s is WDM At the same time, The fiber can carry Ind
ependent data streams on different wavelengths
WDM PONs create point-to-point links between the CO and end user, no sharing is needed
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The WDM PON
A straightforward approach for increasing capacity is to assign different wavelengths to each user for down/upstream transmissions
When a user is idle, the corresponding transceiver in the CO is also idle and cannot be used to support other users
Disadvantage High Cost Waste Bandwidth
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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)
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SUCCESS-DWA PON Architecture
TL = Tunable laser CH X = Thin-film WDM filter
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Downstream
Two TLs must not access the same ONU simultaneously
The AWG does allow all TLs to simultaneously transmit on the same wavelength
All TLs share the load, shifting bandwidth back and forth across the separate physical PONs -- DWA
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Functional diagrams of the OLT and ONU
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The Upstream Scenario
Each user is equipped with a fixed-wavelength transmitter that corresponds to the upstream group
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The Upstream Scenario
Additionally, upstream and downstream AWGs pass completely different wavelengths and require different channel spacings
Only one Photodetector (PD) and its corresponding receiver module are activated in the initial deployment
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Performance
We compare the performance of a four-TL SUCCESS-DWA PON to four TDM PONs
Both TDM and SUCCESS-DWA PONs are subject to the exact same traffic patterns in any given simulation run
The traffic model is the α-stable self-similar traffic model
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Performance
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Wavelength Plan
A trade-off lies between number of the AWG channels and maximum modulation bandwidth
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Conclusions
SUCCESS-DWA can viewed as a scalable network taking advantage of both TDM and WDM
The scheduling algorithm in the OLT is responsible for managing the traffic flow for fair access of end users
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Reference
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
http://www.eas.asu.edu/trace/optical/applet1.html