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Opportunities and Challenges for Optical Burst- and Packet- switching-. S. J. Ben Yoo, Fei Xue, et al. Optical Switching and Communications Systems Lab University of California, Davis [email protected] Progress in Optical Networks. Optical Packet Switching. Optical Burst Switching.

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Opportunities and Challenges for Optical Burst- and Packet- switching-

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Opportunities and challenges for optical burst and packet switching

Opportunities and Challenges for

Optical Burst- andPacket- switching-

S. J. Ben Yoo, Fei Xue, et al.

Optical Switching and Communications Systems Lab

University of California, Davis

[email protected]


Progress in optical networks

Progress in Optical Networks

Optical Packet Switching

Optical Burst Switching

Optical Label Switching

Optical Circuit Switching

Function

Optical Packet

Optical Add/Drop

Capacity

Optically Amplified

Dynamic

WDM

Static

Single Channel

Pt-to-Pt

Ring

Mesh

Topology


Optical burst switching

Optical Burst Switching


Diff serve obs performance

Diff Serve OBS Performance


Throughput comparison obs vs ocs

Throughput comparison OBS vs. OCS

Under the same network conditions, OBS networks can achieve 20%~30% more throughput than those in OCS networks.


Motivations for optical packet switching

Motivations for Optical Packet Switching

  • Data-centric + High-Bandwidth

  • Packet + Optical

  • Sub-wavelength granularity

  • Cost-effective service delivery and flexibility

  • Avoid electrical RAM and O/E/O bottleneck

    • DRAM getting faster only by 7%/year

    • O/E/O conversion consumes power and space

  • Scalability for future bandwidth growths

  • Use optical parallelism for simpler switching fabric

  • From ATM/SONET to IP/WDM paradigm


Next generation network overview

Next Generation Network Overview

Optical Core Network

OLS

switches

OLS

switches

Edge

router

Edge

router

OLS

routers

Legacy

MAN

MAN

MAN

Edge router

Star Coupler

Star Coupler

Legacy

LAN

SENSOR

Networks

Wireline

O-CDMA LAN

Free Space and Wireline

O-CDMA LAN


Opportunities and challenges for optical burst and packet switching

Label Processing Module-TI

(LP-TI)

label

reader

Switch Controller

w/ Forwarding

Look-up Table

Switching

Fabric

fiber

delay

NC&M

DEMUX

CI

CI

CI

OLE

OLE

OLR

OLR

OLE

OLR

(LP-CI)

Label Processing

Modules-CI

OLS

Edge Router

UNAS

ATM

Client Machine

IP Router


Conventional electronic packet switches

Conventional Electronic Packet Switches

TIME

Buffer

Memory

Buffer

Memory

Buffer

Memory

Buffer

Memory

Buffer

Memory

Buffer

Memory

Buffer

Memory

Buffer

Memory

Buffer

Memory

Buffer

Memory

Buffer

Memory

Buffer

Memory

MAC

MAC

MAC

MAC

SPACE

controller

Buffer

Memory

Buffer

Memory

MAC

Buffer

Memory

MAC

Buffer

Memory

MAC

MAC

  • Buffer, Schedule, and Forward

  • Electronic RAM--Diverse Functions

  • Contention Resolution, Queuing, etc in Time


Optical switch fabric used in ucdavis ols core routers

Optical Switch Fabric used in UCDavis OLS core Routers

WAVELENGTH

TIME

SPACE

controller

Fixed Wavelength Converters

Tunable Wavelength Converters

switch

control

l-router

(AWGR)

F_WC

T_WC

F_WC

T_WC

F_WC

T_WC

F_WC

T_WC

Rapid Tuning (~ 1 nsec) of T_WC

to achieve switching in

Wavelength, Time, Space domains

Scalable to 42 Petabit/sec capacity

32*(2562x2562)connectivity


Contention resolution algorithm

Contention Resolution Algorithm

packet arrives

  • S. Yao, S. J. B. Yoo, and B. Mukherjee, “A comparison study between slotted and unslotted all-optical packet-switched network with priority-based routing,” OFC 2001, #TuK2

  • S. Yao, S. J. B. Yoo, B. Mukherjee, S. Dixit, “Hybrid contention resolution for an optical packet-switched network with self-similar IP traffic,” APOC 2001 #4585-04.

  • S. Yao, B. Mukherjee, S. J. Ben Yoo, and S. Dixit, “All-optical Packet-switching for Metropolitan Area Networks: Opportunities and Challanges,” IEEE Comm. Magazine, vol.39, p.142-8 (2001)

  • S. J. B. Yoo, Y. Bansal, Z. Pan, J. Cao, V. K. Tsui, S. K. H. Fong, Y. Zhang, J. Taylor, H. J. Lee, M. Jeon, V. Akella, K. Okamoto, S. Kamei, “Optical-Label Switching based Packet Routing System with Contention Resolution Capabilities in Wavelength, Time, and Space Domains,” OFC 2002, paper #WO2 (2002).

no

contention ?

yes

yes

l cont. res.?

no

yes

time cont. res.?

no

yes

space cont. res.?

no

forward

Send to Edge Router

for cont. res. or drop


Ols core and edge routers

OLS Core and Edge Routers


Optical packet assembly mechanism

Optical Packet Assembly Mechanism

MPS

  • Assemble a larger optical packet from IP packets based on destination and QoS

  • The creation of an optical packet:

    • Reach the Maximum Payload Size (MPS)

    • Expiration of Assembly Time-out Period (T)


Optical packet assembly mechanism1

Optical Packet Assembly Mechanism

MPS

  • Assemble a larger optical packet from IP packets based on destination and QoS

  • The creation of an optical packet:

    • Reach the Maximum Payload Size (MPS)

    • Expiration of Assembly Time-out Period (T)


Optical packet assembly mechanism2

Optical Packet Assembly Mechanism

MPS

  • Assemble a larger optical packet from IP packets based on destination and QoS

  • The creation of an optical packet:

    • Reach the Maximum Payload Size (MPS)

    • Expiration of Assembly Time-out Period (T)


Optical packet assembly mechanism3

Optical Packet Assembly Mechanism

MPS

  • Assemble a larger optical packet from IP packets based on destination and QoS

  • The creation of an optical packet:

    • Reach the Maximum Payload Size (MPS)

    • Expiration of Assembly Time-out Period (T)


Optical packet assembly mechanism4

Optical Packet Assembly Mechanism

MPS

  • Assemble a larger optical packet from IP packets based on destination and QoS

  • The creation of an optical packet:

    • Reach the Maximum Payload Size (MPS)

    • Expiration of Assembly Time-out Period (T)


Optical packet assembly mechanism5

Optical Packet Assembly Mechanism

MPS

  • Assemble a larger optical packet from IP packets based on destination and QoS

  • The creation of an optical packet:

    • Reach the Maximum Payload Size (MPS)

    • Expiration of Assembly Time-out Period (T)


Traffic shaping at the edge routers packet length distribution at the client and at the core

Traffic Shaping at the Edge RoutersPacket length distribution at the Client and at the Core

transport

client


Packet loss rates for networks with various number of l

Packet-loss rates for networks with various number of l


Ip client to ip client with cascaded operation of olsrs

IP Client-to-IP Client with Cascaded Operation of OLSRs

Label

Payload

Label

L1,L2

P1,P2

Label

Payload

Payload

L1

P1

L3

P3

L1,L2,L3

L2

P2

P1,P2,P3

IP Client Network

Edge Router

Ingress

Path

Egress

Path

Optical Label Switching Network

Physical Layer Interface

Encapsulation

AOLS Interface

Label processing Unit

Core Router

Data bus traffic controller

Data Bus

Core Router

Data bus traffic controller

PPP

POS Interface

SONET

Physical Layer Interface

Edge Router

Core Router

POS

P1,P2,P3

Edge Router

P1

POS

IP Client Network


Possible network evolution scenario

Possible Network Evolution Scenario

Electronic ATM Network

Electronic IP Network

Electronic IP Network

LAN

LAN


Possible network evolution scenario1

Possible Network Evolution Scenario

Electronic MPLS Network

Electronic IP Network

Electronic IP Network

LAN

LAN


Opportunities and challenges for optical burst and packet switching

Possible Network Evolution Scenario

MPLambdaS Network

Electronic MPLS Network

Electronic MPLS Network

LAN

LAN


Possible network evolution scenario2

Possible Network Evolution Scenario

Electronic MPLS Network

Electronic MPLS Network

Optical Label Switched Network

LAN

LAN


Possible network evolution scenario3

Possible Network Evolution Scenario

Electronic MPLS Network

MPS Network

Optical Label Switched Network

Electronic MPLS Network

GMPLS II

Electronic MPLS Network

Electronic MPLS Network

LAN

LAN

LAN


Summary

Summary

  • Optics provides capacity, packet switching provides flexibility and fine granularity

  • Optical Label Switching Provides interoperability in Packet, Burst, and Circuit switching

  • Unified contention resolution in wavelength, time, and space domain.

  • Edge router function critical in performance enhancement and traffic shaping

  • Seamless network evolution from today’s circuit-switching to tomorrow’s burst- and packet- switching


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