Download 20040420-Corp-Verrant

Design, Simulation, Testing, Management of
Optical Networks
Jeff Verrant
CIENA Proprietary and Confidential
New Optical Technologies
Design Considerations
• UltraFEC
• Raman / VGA
• Gain Flattening
• DCM
• Tunable Lightpaths
• Optical Switching
CIENA Proprietary and Confidential
2
BER Improvement Using 10G FEC
•
1E-0 1
– 9.953 Gb/s
– 1E-15 BER @ 25 dB SNR
0.1
1 10
Bit Error Rate
(BER)
Bit Error Ratio
1 10
Uncoded
0.01
3
4
5
11E-5
10
6
1 10
7
1 10
8
1 10
9
1 10
10
11E-10
10
11
1 10
12
1 10
13
1 10
14
1 10
15
1E-15
1 10
16
1 10
17
1 10
18
1 10
19
1 10
20
1 10
21
1 10
22
1 10
• FEC
–
–
–
–
10.66 Gb/s (overhead = 7%)
1E-15 BER @ 19 dB SNR
FEC Gain = 6dB
SNR equivalent to 1E-4 BER
uncoded
• Ultra-FECTM
0
5
2
7
4
9
6
8
uncoded
Signal
coded (31,27)
coded (255,241)
CIENA Proprietary and Confidential
10
12
14
16
11 Ratio 13
15
17
19
21
of Bit Energy to Noise Power (db)
18
23
20
25
–
–
–
–
22
27
to Noise Ratio (dB)
3
10.66 Gb/s (overhead = 7%)
1E-15 BER @ 17 dB SNR
FEC Gain = 8dB
SNR equivalent to 1E-4 BER
uncoded
Raman Amplifier
• Deployed on an as-needed basis to augment ILAs (optional)
• Provides additional gain for high-loss spans
• Uses the transmission fiber as a gain medium
• Enables lower launch power
• Improves OSNR characteristic
• Minimizes non-linear effects
Amplified
Spontaneous
Emissions
Transmission Fiber
Amplified
Signal
Weak
Signal
pump signal output
pump signal input
Increased OSNR margin can be used
for more channels or more distance
CIENA Proprietary and Confidential
Amplified
Spontaneous
Emissions
4
Spectral Flattening
-35
Input
power (dBm)
-40
-45
-50
Downstream
Optical Tap
Amp
EQ
-55
-60
1525
1535
1545
1555
1565
Output
-40
l
power (dBm)
-45
-50
Amp
MON
Communication Channel
-55
-60
1525
Pout
Pin
wavelength (nm)
1535
1545
1555
1565
-65
wavelength (nm)
CIENA Proprietary and Confidential
5
l
Fiber Dispersion – an Extended View
CIENA Proprietary and Confidential
6
Slope issues
Target Range
Band4 Band5
CIENA Proprietary and Confidential
Band6
7
Better Slope Compensation for ULH
• Better Dispersion Slope
Compensation
– Correct edge band
dispersion
– Better overall dispersion
control
– Less band level DCM
– Manage XPM and SPM
CIENA Proprietary and Confidential
8
10 Gb/s U-FEC XCVR
• Supports 25GHz and 50GHz channel
spacing
– Up to 160-192 channel system capacity in
the C-Band
• Works in UHD or ULH Applications
– UHD utilizes 25GHz spacing to maximize
system capacity
– ULH utilizes 50GHz spacing to optimize
transmission distance
• Supports SR-2 (25km) and SR-1 (2km)
client-side applications
CIENA Proprietary and Confidential
9
Dynamic Optical Switching
Application Networking Enabled by Tunable Wavelengths
Ch X
Ch Y
Cluster
Storage Array
Myrinet
Cluster
Tx
Ch X
Myrinet
Rx
10G tunable
TCVR
CIENA Proprietary and Confidential
Ch Y
AWG
10
Optimal Hybrid Switching Evolution
Client Interfaces
Electronic
Grooming
Fabric
All-Optical
Express /
Switching
Fabric
WDM
Termination
l
O-E-O OXC
Switch /
Router
Integrated WDM
Tunable Optics
2.5G 10G 40G
LH ULH WDM
Ring Mesh
OADM or O-O Switch
Combine Electronic and Optical Switch Fabrics to
achieve Optimum Hybrid Switching Solution
CIENA Proprietary and Confidential
11
Optical Transmission Systems
Core DWDM Key Requirements
• Systems should support all applications
DWDM Terminal
DWDM Terminal
– Gain Flattened EDFA, FEC, Raman, and allow
Transport Systems to handle links up to 3600km
Optical
Add/Drop
AMP
AMP
– Systems support for NDSF, NZDSF, and DSF
fibres
AMP
AMP
– 2.5Gbps, 10Gbps and 40Gbps
– Flexible Channel Spacing, 50GHz (for 2000km+) &
25GHz (up to 1600km)
– C band w/ L-Band Upgrade when required
Active Spectral Control
Capable of handling data rates
40G
Power (dBm)
(dBm)
Power
Power (dBm)
(dBm)
Power
Power
(dBm)
(dBm)
Power
Power
(dBm)
Power
(dBm)
Power
Power (dBm)
(dBm)
Power
(dBm)
Power
(dBm)
Power
Power (dBm)
(dBm)
-15
-15
-15
-15
-15
-15
-15
-15
-15
-15
-15
-15
-15
-15
-20
-20
-20
-20
-20
-20
-20
-20
-20
-20
-20
-20
-20
-20
-15
• Special technologies used only where needed
• Flexible (100%) Add/Drop Capability at
Intermediate Sites
• Flexible Interfaces, SDH, GbE, 10GbE
3600 km, 80x10Gb/s NRZ @ 50 GHz
10G
2000 km, 160x10Gb/s NRZ @ 25 GHz
2.5G
-20
-25
-25
-25
-25
-25
-25
-25
-25
-25
-25
-25
-25
-25
-25
-25
-30
-30
-30
-30
-30
-30
-30
-30
-30
-30
-30
-30
-30
-30
-30
-35
-35
-35
-35
-35
-35
-35
-35
-35
-35
-35
-35
-35
-35
-35
OADM
Nodes
-40
-40
-40
-40
-40
-40
-40
-40
-40
-40
-40
-40
-40
-40
-40
-45
-45
-45
-45
-45
-45
-45
-45
1525
1535
-45
-45
-45
-45
-45
-45
-45
1545
1555
Wavelength
1565
Wavelength
(nm)
1525
1525
1525
1525
1525
1525
1535
1525
1535
1535
1535
1535
1535
1545
1535
1545
1545
1545
1545
1545
1555
1545
1555
1555
1555
1555
1555
1565
1555
1565
1565
1565
1565
1565
1565
1525
1525
1525
1525
1525
1525
1535
1525
1535
1535
1535
1535
1535
1545
1535
1545
1545
1545
1545
1545
1555
1545
1555
1555
1555
1555
1555
1565
1555
1565
1565
1565
1565
1565
1565
Wavelength
Wavelength
Wavelength
Wavelength
Wavelength
Wavelength
Wavelength
(nm)
(nm)
(nm)
(nm)
(nm)
(nm)
(nm)
Wavelength
Wavelength
Wavelength
Wavelength
Wavelength
Wavelength
Wavelength
(nm)
(nm)
(nm)
(nm)
(nm)
(nm)
(nm)
CIENA Proprietary and Confidential
Up to 1600 km, 40x40Gb/s CS-RZ @ 100 GHz
or 192x10Gb/s NRZ @ 25 GHz
Channel Counts
are C-Band only.
12
Degree-2 Optical Switch (S-OADM)
•
Degree-2 Functional Operation
SelectOADM
Drop
•
Add
Drop any channel from incident optical
spectrum
•
Single channel drop, or
•
Drop any N wavelengths of arbitrary frequency, or
•
Drop any N wavelengths with sequential frequencies
Avoids stranded bandwidth concern associated
with ‘fixed band’ OADM design
RBF Principle of Operation
Sample Data
Fiber input/output
‘10100110011111’ wavelength pattern
0
Diffraction
grating
l1… lN
Attenuatioan (dB)
-10
1 on
1 on
2 on
5 on
continuous
passband
-20
l1
LC Array enables
continuous passband
-30
1 off
2 off
2 off
MEMS mirror array
-40
continuous
stopband
-50
1551
1552
1553
1554
1555
1556
or diffractive MEMS
or LC array
1557
Wavelength (nm)
CIENA Proprietary and Confidential
13
li
Collimating
lN
Lens
The BOE Design Method for Optical Networks
CIENA Proprietary and Confidential
14
Long Haul Design Tools
OUTPUT SUMMARY
Output Signal Characteristics by Path and Band
Path
Band
Chicago to Atlanta
CIENA Proprietary and Confidential
2
3
4
5
6
7
Q W2E
(lin)
4.4
4.4
4.5
4.5
4.4
4.4
15
OSNR W2E
(dB)
15.6
15.6
15.7
15.7
15.6
15.6
Q E2W
(lin)
4.3
4.4
4.4
4.4
4.4
4.5
OSNR E2W
(dB)
15.6
15.6
15.6
15.6
15.6
15.6
Metro Optical Network Design – The Most Difficult!
•
Subnetwork Topology Definition
•
Actual and Planned Service Design
 Protected/Unprotected Services
 Automatic/Manual Route Selection
 Equipment Optimization & Layout
 Placement of Amps, DCF
 ‘What if’ scenario’s
•
Full Physical Network Simulation
 Automated Link Budget Calculation
BOL, EOL, Normal, Power, OSNR,
Dispersion, Jitter, Gain Tilt, Dynamic Power
Equalization,...
 Span and Node Failure Analysis
 Graphical Plots of Optical Signal Quality
•
Equipment Ordering Reports
•
Visio connection diagrams
•
Data Import/Export Functionality
CIENA Proprietary and Confidential
16
End to End Network Management
End to End Network Management
Metro Access
Metro Core
Long Haul Core
Core Switch
Integrated OS
Metro DWDM
OADM
Metro
DWDM
FLEX
EDGE
2.5G OADM
ULH
DWDM
2.5G
EDGE
Edge
Core Switch
EDGE
MetroSwitch
CI
OLA
OADM
ULH
DWDM
SELECT
EDGE
OLA
E
W
CS
LH DWDM
CIENA Proprietary and Confidential
17
CS
Complete Software Family
Planning, Installation, and Management
Network
Diverse
Systems
Customer OSS
Manage Services across
Multi-Vendor Networks
CORBA
Multi-Ring
Network
Network Manager
Manage 100's of NEs in multiple
subnetworks
Subnetwork
Craft Interface GUI
Access and manage a single
subnetwork from an NT laptop
Network
Element
Automatic Installation Engine
Import Network Design data
for efficient NE turn-up and provisioning
Network OS
Embedded Subnetwork
Management and Automation
file
Network Design
CIENA Proprietary and Confidential
18
Optical Network Operating System
CIENA Proprietary and Confidential

End-to-End Wavelength Management
with Dynamic Power Control

Fast, On-Demand Service Provisioning

Standards-based Interfaces

Embedded sub-network management

Full FCAPS coverage

Fault

Configuration

Performance

Security

Redundancy and High-availability

Resource management and diagnostics
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