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Suhas Mansingh
Sr. Director, Engineering
Converged Optical and Routing Business Unit
Emerging Optical Transport Technology and Architecture
© 2010 Cisco and/or its affiliates. All rights reserved. Cisco Public 2
2 2
Ease of Operation
Increase Service Velocity
Enhance Availability
and Resiliency
Reduce / Simplify Planning
and Forecasting
Reduce CAP and OP EX
Need to address the Network not a Box or Layer
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40% CAGR 2008-2013
Internet-Video-to-TV is the highest growing Internet category with a CAGR of 150%
Source: Cisco Visual Networking Index—Forecast, 2008-2013
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Optics
IP
Transport
40G and 100G
Coherent
400-1TB
Tunable XFP & SFP+
Routing
Services
MPLS
MPLS-TP
ROADM
Metro, Regional, LH
Colorless OmniDir
Flexible Spectrum
Control Plane
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CP: Coherent Polarized
Leverages on Polarization Multiplexing to transmit with Lower Baud Rate (e.g. 40Gbps as 10GBaud / 100Gbps as 25GBaud)
Leverages on Coherent Detection and Electronic Post-Processing to provide high tolerance to PMD and CD
DQPSK: Differential QPSK
Differential operating mode provides required system robustness against Laser Cycle Slips
Laser Cycle Slips can be caused by ASE, Laser Phase Noise and XPM (induced by 10G IM/DD channels)
Even w/o 10G channels ASE and Laser Phase Noise can cause Laser Cycle Slips
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e.g. 100 Gbps
Capacity with a
25 Gbps Optical
Bandwidth
2+2bit/symbol
QPSK1
‘11’
‘00’
‘01’
‘10’
QPSK2
‘11’
‘00’
‘01’
‘10’
Laser
25Gb/s
QPSK1 Modulator
25Gb/s
100 Gbps = 25 Gbaud 25Gb/s
QPSK2 Modulator
25Gb/s
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Direct Detection
Must correct for impairments in the physical domain (insert DCU’s)
Forced to live with non-correctable impairments via network design (limit distance, regenerate, adjust channel spacing)
Coherent Detection
Moves impairment correction from the optical domain into the digital domain
Allows for digital correction of impairments (powerful DSP) vs. physical correction of impairments (DCU’s). Adds advanced FEC.
Massive performance improvements over Direct Detection.
DD
CD
DD
DCU DCU DCU
Regen
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1 - O
dd
1- E
ven
2 - O
dd
2 - E
ven
3 - O
dd
3 - E
ven
4 - O
dd
4 - E
ven
5 - O
dd
5 - E
ven
6 - O
dd
6 - E
ven
7 - O
dd
100 G
bp
s
400 G
bp
s
1 T
bp
s
100 G
bp
s
1 T
bp
s
100 G
bp
s
Flex Spectrum ROADM
NO restrictions on Channels Spacing
Modulation Format
Wavelengths with different Bit Rates.
Higher per-channel bit Rates
Control non-linear effects (XPM, FWM)
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Zero-Touch Photonic Layer
ANY Modulation
Format
ANY Channel Bit
Rate
ANY Portion of the Optical Spectrum
Contentionless ROADM
ANY Combinatio
n of Wavelength
s to ANY Degree from
ANY Port
Fully Flexible ROADM
Colourless: ANY Wavelength to ANY Add/Drop
port
Omni-Directional: ANY Wavelength to ANY Degree
WSON control plane
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ROADM
RX TX RX TX
X
Tunable Laser – Transmit laser can be provisioned to
any frequency in the C-Band.
Colorless – ROADM add ports provisioned in software
and rejects any other wavelengths.
Tunable Receiver – Coherent Detection accepts provisioned wavelength and
rejects all others.
Omni-Directional – Wavelength can be routed
from any Add/Drop port to any direction in software.
Contention-less – In the same Add/Drop device you can add and drop the same frequency to multiple ports.
Flex Spectrum – Ability to provision the amount of
spectrum allocated to each Wavelength allowing for 400G
and 1T bandwidths.
Restoration – Ability to reroute a dangling resource to another path after protection
switch.
Key Values
Complete Control in Software No Manual Movement of Fibers
Increased Service Velocity Control Plane Can Automate Provisioning, Restoration, Network
Migration, Maintenance
Foundation for IP+Optical!!
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•Common development with Routing platform
•Fully integrated IPoWDM control plane solution providing Bandwidth on demand
•Network failure reaction
•2nd failure handling
•Multiple SLA options (Bronze 0+1, Super Bronze 0+1+R, Platinum 1+1, Super Platinum 1+1+R)
•Bandwidth addition on the same connection
•New connection setup
•Wavelength reroute for manual restoration
•Alien wavelength (open network)
•Transponder (closed network)
• ITU-T interfaces (segmented network)
Client interface
registration
Wavelength on demand
(Zero planning
wavelength setup)
GMPLS UNI
Optical shared
restoration: 0+1+R and
1+1+R