Design, Simulation, Testing, Management of Optical Networks

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Design, Simulation, Testing, Management of
Optical Networks

• Jeff Verrant

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New Optical TechnologiesDesign Considerations

• UltraFEC
• Raman / VGA
• Gain Flattening
• DCM
• Tunable Lightpaths
• Optical Switching

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BER Improvement Using 10G FEC

• Uncoded
• 9.953 Gb/s
• 1E-15 BER _at_ 25 dB SNR
• FEC
• 10.66 Gb/s (overhead 7)
• 1E-15 BER _at_ 19 dB SNR
• FEC Gain 6dB
• SNR equivalent to 1E-4 BER uncoded
• Ultra-FECTM
• 10.66 Gb/s (overhead 7)
• 1E-15 BER _at_ 17 dB SNR
• FEC Gain 8dB
• SNR equivalent to 1E-4 BER uncoded

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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
Amplified Spontaneous Emissions
Transmission Fiber
Weak Signal
Amplified Signal
pump signal output
pump signal input
Increased OSNR margin can be used for more
channels or more distance
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Spectral Flattening
Input
Downstream Optical Tap
Amp EQ
Pout
Pin
Output
l
l
Amp MON
Communication Channel
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Fiber Dispersion an Extended View
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Slope issues
Target Range
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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

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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

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Dynamic Optical Switching Application Networking
Enabled by Tunable Wavelengths
Ch X
Ch Y
Cluster
Storage Array
Cluster
Ch X
Ch Y
HPC Applications
Ch X
HPC Applications
Ch Y
10G tunable TCVR
AWG
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Optimal Hybrid Switching Evolution
Client Interfaces
O-E-O OXC
Switch / Router
l
Electronic Grooming Fabric
WDM Termination
Integrated WDM Tunable Optics
2.5G 10G 40G LH ULH WDM Ring Mesh
All-Optical Express / Switching Fabric
OADM or O-O Switch
Combine Electronic and Optical Switch Fabrics to
achieve Optimum Hybrid Switching Solution
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Optical Transmission SystemsCore DWDM Key
Requirements

• Systems should support all applications
• Gain Flattened EDFA, FEC, Raman, and allow
  Transport Systems to handle links up to 3600km
• Systems support for NDSF, NZDSF, and DSF fibres
• 2.5Gbps, 10Gbps and 40Gbps
• Flexible Channel Spacing, 50GHz (for 2000km)
  25GHz (up to 1600km)
• C band w/ L-Band Upgrade when required
• Special technologies used only where needed
• Flexible (100) Add/Drop Capability at
  Intermediate Sites
• Flexible Interfaces, SDH, GbE, 10GbE

DWDM Terminal
DWDM Terminal
Optical Add/Drop
AMP
AMP
AMP
AMP
Active Spectral Control Capable of handling data
rates
40G
3600 km, 80x10Gb/s NRZ _at_ 50 GHz
10G
2000 km, 160x10Gb/s NRZ _at_ 25 GHz
2.5G
Power (dBm)
OADM Nodes
Up to 1600 km, 40x40Gb/s CS-RZ _at_ 100 GHz
or 192x10Gb/s NRZ _at_ 25 GHz
Wavelength
Channel Counts are C-Band only.
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Degree-2 Optical Switch (S-OADM)
Degree-2 Functional Operation

• 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

Select- OADM
Drop
Add
RBF Principle of Operation
Sample Data
10100110011111 wavelength pattern
continuous passband
LC Array enables continuous passband
continuous stopband
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The BOE Design Method for Optical Networks
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Long Haul Design Tools
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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 scenarios
• 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

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End to End Network Management
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Complete Software Family Planning, Installation,
and Management
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Optical Network Operating System

• 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