Dec.5, 2003 Globecom’03 Workshop W-2 K. Kitayama, Japan Research project on Optical burst switching network -Supported by Telecomunications Advancement Organization of Japan- Ken-ichi Kitayama Osaka University, Japan E-mail: [email protected]Osaka Univ.
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Dec.5, 2003 Globecom’03 Workshop W-2 K. Kitayama, Japan Research project on Optical burst switching network -Supported by Telecomunications Advancement.
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Dec.5, 2003 Globecom’03 Workshop W-2
K. Kitayama, Japan
Research project onOptical burst switching network
-Supported by Telecomunications Advancement Organization of Japan-
with Roof-type Retro-reflectorwith Roof-type Retro-reflector
by a factor of 1/2 of Flat-reflector (Lucent)by a factor of 1/2 of Flat-reflector (Lucent)
Size: 87 x 77 x 53 mmSize: 87 x 77 x 53 mm
Insertion Loss: 3 dBInsertion Loss: 3 dB
Crosstalk: < -40 dBCrosstalk: < -40 dB
80x80 Channels80x80 Channels
Targeting;Targeting;
256x256 Ch.256x256 Ch.
2,000x2,000 Ch.2,000x2,000 Ch.
Dec.5, 2003 Globecom’03 Workshop W-2
K. Kitayama, Japan
Optical switch module
BB
H: 1ms/div
Switching
Optical Switch
In #1
In #2
Out #1
Out #2
BBOptical Switch
In #1
In #2
Out #1
Out #2
In #1
Out #1
In #2
AA
Burst ABurst A
Burst BBurst B
Burst ABurst A Burst BBurst BSize: 150(W) x 400(H) x 300(D) mmSize: 150(W) x 400(H) x 300(D) mm
Supply Voltage: 200 VSupply Voltage: 200 V
Power Consumption: 22 WPower Consumption: 22 W
80x80 Channels80x80 Channels
Feed-forward ControlFeed-forward Control1ms
Dec.5, 2003 Globecom’03 Workshop W-2
K. Kitayama, Japan
Research subjects and their responsibilities- Aiming at high-efficiency photonic networking technology for bursty traffic -
ControlControl
Data burstData burst
Source node Destination node
0
1
2
#3 Optical control packet- Osaka Univ.
#3 Optical control packet- Osaka Univ.
#4 Optical switch fabric- Fujitsu -
#4 Optical switch fabric- Fujitsu -
#2 Contention resolution and RWA- Univ. Tokyo -
#2 Contention resolution and RWA- Univ. Tokyo -
#1 OBS network architecture and its control plane- NTT -
#1 OBS network architecture and its control plane- NTT -
Dec.5, 2003 Globecom’03 Workshop W-2
K. Kitayama, Japan
Deflection routing
Deflect blocked bursts to idle fiber links
Save bandwidth A dropped burst wastes the
bandwidth on the partially established path
Save time The delay becomes very
large when retransmitting a blocked burst in long-distance links
F G H I J
A B C D E
Without Deflection
With Deflection
Univ.Tokyo
Dec.5, 2003 Globecom’03 Workshop W-2
K. Kitayama, Japan
Priority-based wavelength assignment
Each sender keeps a wavelength priority database for every destination node. By learning from the statistical data of prior transmission results, each node ranks wavelengths for giving prioritized wavelength assignment.
As learning progresses, wavelength spatial reuse becomes possible
Rcv . b Rcv . c Rcv . d Rcv . a Rcv . c Rcv . d Rcv . a Rcv . b Rcv . d Rcv . a Rcv . b Rcv . cDatabase a Database b Database c Database d. Rcv . c Rcv . d Rcv . a Rcv . c Rcv . d Rcv . a Rcv . b Rcv . d Rcv . a Rcv . b Rcv . c
Rcv . b Rcv . c Rcv . d Rcv . a Rcv . c Rcv . d Rcv . a Rcv . b Rcv . d Rcv . a Rcv . b Rcv . cDatabase a Database b Database c Database d. Rcv . c Rcv . d Rcv . a Rcv . c Rcv . d Rcv . a Rcv . b Rcv . d Rcv . a Rcv . b Rcv . c
Research subjects and their responsibilities- Aiming at high-efficiency photonic networking technology for bursty traffic -
ControlControl
Data burstData burst
Source node Destination node
0
1
2
#3 Optical control packet- Osaka Univ.
#3 Optical control packet- Osaka Univ.
#4 Optical switch fabric- Fujitsu -
#4 Optical switch fabric- Fujitsu -
#2 Contention resolution and RWA- Univ. Tokyo -
#2 Contention resolution and RWA- Univ. Tokyo -
#1 OBS network architecture and its control plane- NTT -
#1 OBS network architecture and its control plane- NTT -
Dec.5, 2003 Globecom’03 Workshop W-2
K. Kitayama, Japan
Tell-and-go protocol using OC-label (OC-TAG)
Source Destination
Offset time
Tim
e
Distance
Burst data
Data transmission
Release signalfor unlimited burst duration
OC-label processing for control packet OC-labeled control packet neglects the
processing time
Processing delay ~ 0
Offset time
Dec.5, 2003 Globecom’03 Workshop W-2
K. Kitayama, Japan
Blocking probability: JET vs. OC-TAG
Blocking probability: number of blocked requests / number of requests Processing delay at node: 1.0ms (JET case) Number of wavelengths: 32 or 64 No retransmission if data loss occurs
Arrival rate
Mea
n bl
ocki
ng p
roba
bilit
y
Osaka Univ.
Dec.5, 2003 Globecom’03 Workshop W-2
K. Kitayama, Japan
OC-label processing for control packet
Optical switch
Burst data
Offset time
Electrical processingElectrical processing
O/E E/O
OC-labeled control packeton out-of-band wavelength 0
OC OC’OC-label processorOC-label processor
Ultrafast setup of optical path
Osaka Univ.
OC-labelfor LSP
OC-lablefor
Dec.5, 2003 Globecom’03 Workshop W-2
K. Kitayama, Japan
Experimental OC-labeled control packet processings
LN-IMLN-IM Decoder1Decoder1
Encoder3Encoder3
SASA Encoder4Encoder4
Gate signalgenerator
Gate signalgenerator
Optical mask
Add the available wavelength 2
20m
V/d
iv
100ps/div
R2 R2
20m
V/d
iv
0 0
8-chip OC-label
Osaka Univ.
100ps/div
LabelsR1
LabelsR1
20m
V/d
iv20
mV
/div
20m
V/d
iv
1×2Switch
1×2Switch
Label R1 recognition
Label swapping from R1 to R2
PPGPPG
Cross-correlation
Auto-correlation
Dec.5, 2003 Globecom’03 Workshop W-2
K. Kitayama, Japan
Summary
National R&D project, particularly focus on OBSComprehensive program from optical switch, transport
plane, control plane, and management plane
Field trials in the network testbed planned;PHASE I in 2003-2004: Photonic MPLS extentionPHASE II in 2005: Novel RWA & OC-label processing