Dynamic Optical Networking: Challenges and Solutions · Dynamic Optical Networking: Challenges and...
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Dynamic Optical Networking: Challenges and Solutions Sorin Tibuleac, Roy Bowcutt February 3, 2010
Transcript of Dynamic Optical Networking: Challenges and Solutions · Dynamic Optical Networking: Challenges and...
Dynamic Optical Networking: Challenges and Solutions
Sorin Tibuleac, Roy Bowcutt
February 3, 2010
© 2009 ADVA Optical Networking. All rights reserved. 2
Criteria for Network Growth
Increase total network Capacity Higher data rates (100G, 40G, etc)
Increased channel count (80 wavelengths)
Increase Reach Upgrade strategy leverages installed networks
Growing capacity without sacrificing reach
Increase network Flexibility and Control Colorless and steerable ROADMs
Comprehensive controllability solution
Capacity
Rea
ch
Total Network Growth
Technologies that expand all
capabilities instead of focusing on a single dimension
© 2009 ADVA Optical Networking. All rights reserved. 3
Capacity and reach
Evaluate tradeoffs between network capacity and
reach Capacity
Rea
ch
© 2009 ADVA Optical Networking. All rights reserved. 4
Evolution of Transmission Capacity
10 Gb/s NRZ-OOK, lowest cost/bit
40 Gb/s with 50GHz/80 channels
DPSK - cost/bit decreasing
Next gen. 40G: coherent PM-QPSK
100 Gb/s challenges
Support for existing DCMs, ROADMs…
Diverse requirements and lowest cost:
Reach: 200km to 2000km
Number of channels
Protocol transparency
Latency
NRZ-OOK
Re
Im
DPSK
Re
Im
Capacity
Rea
ch
Re
Im PM-QPSK
© 2009 ADVA Optical Networking. All rights reserved. 5
Capacity
Rea
ch
112G Coherent Pol.Mux.-QPSK
Coherent PM-QPSK:
Supports 50 GHz DWDM with ROADMs
High CD and PMD tolerance
Low OSNR, >1500 km reach
Lesser performance on networks with DCMs
High complexity = high cost
PBC PBS
Driver Filter
Driver Filter
PC
PC Dig
ital F
ilter
(FFE
)
90° Hybr.
QPSK Coder
QPSK Coder
90° Hybr.
0°
90°
0°
90°
CW LD
90°
90°
PC PBS LO
Clie
nt I/
F (C
FP)
Clie
nt I/
F (C
FP)
FEC
, Fra
min
g, M
onito
ring
FEC
, Fra
min
g, M
onito
ring
AD
C
AD
C
AD
C
AD
C
Re
Im PM-QPSK
© 2009 ADVA Optical Networking. All rights reserved. 6
100G Standards Coverage
100GBASE-CR10 10m
100GBASE-SR10 100m 100GBASE-LR4
10km 100GBASE-ER4
40km OIF 100G ULH
DWDM Framework
0 10 100 1000 10000
0
50
100
Norm
aliz
ed
Cabling LH Access
OIF
Metro
Sweet spot no coverage
IEEE 802.3ba
Distance (km)
There is a gap in standards coverage, right where the sweet spot of optical transport lies.
Capacity
Rea
ch
© 2009 ADVA Optical Networking. All rights reserved. 7
Latency of 100GE transport
Just looking at receive side of 100GE LH link
PBS
PC
PC
Dig
ital F
ilter
(FFE
, MLS
E)
90° Hybr.
90° Hybr.
0°
90°
0°
90°
LO
Clie
nt I/
F (C
FP)
FEC
, Fra
min
g, M
onito
ring
Gea
rbox
100G
E M
AC
PC
S
10G
E
MA
C
PC
S
FEC
Clie
nt
10G
E
MA
C
PC
S
FEC
Clie
nt
10G
E
MA
C
PC
S
FEC
Clie
nt
Now, comparing to the 100GE Metro receiver
Re
Im PM-QPSK
Filte
r/Spl
itter
Rx Rx Rx Rx
Clie
nt I/
F
ITU
-T D
WD
M
FEC
© 2009 ADVA Optical Networking. All rights reserved. 8
100G Metro
DML DML DML DML 4:
1 C
oupl
er
Filte
r/Spl
itter
Rx Rx Rx Rx
Clie
nt I/
F
ITU
-T D
WD
M
ITU
-T D
WD
M
Clie
nt I/
F
FEC
FEC
4 x ODB Coders
+
~ (⋅)3 R
Optical Client I/F
R
R
R
+
DM
X
DM
X
Opt
ical
Clie
nt I/
F
[K. Yonenaga et.al., JThA48, OFC/NFOEC 2008]
4x25G transmission in 100GHz
Multi-carrier modulation - 4 directly modulated lasers (DML)
Lowest cost, but limited in distance (200…600 km)
4x28G, spectral efficiency 0.5…1 (bit/s)/Hz
Low power consumption, low footprint, low latency
Optimum for data center connectivity applications
Capacity
Rea
ch
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Flexibility and Control
Considerations for network flexibility and control Capacity
Rea
ch
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Network
IF #1
8x1 WSS
Splitter
100GHz
40CSM …
XPD
R
Network
IF #2 8x1 WSS
Splitter
100GHz
40CSM …
XPD
R
Multi-degree ROADM scalability
Capacity
Rea
ch
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Network
IF #3
8x1 WSS
Splitter
100GHz
40CSM …
XPD
R
Network
IF #1
8x1 WSS
Splitter
100GHz
40CSM …
XPD
R
Network
IF #2
40CSM …
XPD
R
8x1 WSS
Splitter
100GHz
Expanding to three degrees
Capacity
Rea
ch
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8x1 WSS
Splitter
100GHz
XPD
R
40CSM
…
Degree is used for local add/drop
Switching local add/drop λ in any direction
Network
IF #3
8x1 WSS
Splitter
100GHz
40CSM …
XPD
R
Network
IF #1
8x1 WSS
Splitter
100GHz
40CSM …
XPD
R
Network
IF #2
40CSM …
XPD
R
8x1 WSS
Splitter
100GHz
Adding steerable add/drop
Capacity
Rea
ch
© 2009 ADVA Optical Networking. All rights reserved. 13
8x1 WSS
Splitter
100GHz
XPD
R
40CSM
…
Degree is used for local add/drop
Switching local add/drop λ in any direction
Network
IF #3
8x1 WSS
Splitter
100GHz
40CSM …
XPD
R
Network
IF #1
8x1 WSS
Splitter
100GHz
40CSM …
XPD
R
Network
IF #2
40CSM …
XPD
R
8x1 WSS
Splitter
100GHz
Adding steerable add/drop
Capacity
Rea
ch
© 2009 ADVA Optical Networking. All rights reserved. 14
8x1 WSS
Splitter
100GHz
Network
IF #3
8x1 WSS
Splitter
100GHz
40CSM …
XPD
R
Network
IF #1
8x1 WSS
Splitter
100GHz
40CSM …
XPD
R
Network
IF #2
40CSM …
XPD
R
8x1 WSS
Splitter
100GHz
Adding colorless add/drop
Capacity
Rea
ch
XPD
R
100GHz
Combiner
WSS
Switching any 8 of 40 λ in any direction
© 2009 ADVA Optical Networking. All rights reserved. 15
Signal Bandwidth & ROADM Bandpass
Signal bandwidth clipped by passband of 50GHz WSS
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Bandwidth Narrowing
Evolution of bandwidth with number of ROADMs in the optical path for different bandwidth shapes characterized by Gaussian orders
70GHz bandwidth - 100GHz ROADM
40GHz bandwidth - 50GHz ROADM
Gaussian order
Gaussian functions of different orders
© 2009 ADVA Optical Networking. All rights reserved. 17 17
ROADM with variable bandwidth
Programmable continuous spectral shaping
Mixing of 50GHz, 100GHz and 200GHz frequency spacing
In-service upgrades 100GHz to 50GHz
Ready for any future channel modulation and data rate
No passband impact at pass-through sites
17
T. Strasser, IEEE LEOS 2008
© 2009 ADVA Optical Networking. All rights reserved. 18
Why multiple ROADMs…
25dB Span
20dB Span
ROADM
Required OSNR at Receiver
2-Deg. ROADMs have lower loss than multi-deg. ROADMs
Longer distances without OEO regeneration
Short distances: Lower Loss = Lower cost by eliminating post-amp
© 2009 ADVA Optical Networking. All rights reserved. 19
ROADM Cost Comparison
Network CapEx savings with Mixed ROADM solution MD ROADMs at fiber
junction nodes 2 Deg ROADMs at
nodes with 2-degree fiber connectivity
Fixed OADMs at access nodes
OADM, 2-Deg. or 4-Deg. ROADM
40 channel transmission
© 2009 ADVA Optical Networking. All rights reserved. 20
G.709 OAM
GMPLS
GMPLS
OSS
Router
Reconfigurable optical layer for full dynamic flexibility
Interoperable peering GMPLS control
End-to-end wavelength path fault and performance monitoring surveillance
Dynamic Optical Transport
Optimized, integrated IP-Optical Network improves network efficiency Reduced OEO transitions, flexible bandwidth usage
© 2009 ADVA Optical Networking. All rights reserved. 21
O-E E-O DMux Mux
O-E E-O DMux Mux
Router
EXC,PIC
WSS-ROADM
O-E O-E
80 Conv
80 Conv
2 Conv
More Latency
Less Latency
And now latency…
Enabling cloud computing by minimizing latency
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Summary
100G - Must contain cost, power, latency, footprint Multiple transponder solutions
Reach impacted by bandpass narrowing ROADMs with variable passband
Increased flexibility Colorless and steerable ROADMs GMPLS end-to-end control
Network cost optimization 2-deg. & multi-deg. ROADMs
