Modular and Expandable CDC ROADMs - ECOC 2018 MF... · Metro CDC ROADM requires a small number of...
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Transcript of Modular and Expandable CDC ROADMs - ECOC 2018 MF... · Metro CDC ROADM requires a small number of...
![Page 1: Modular and Expandable CDC ROADMs - ECOC 2018 MF... · Metro CDC ROADM requires a small number of add/drop ports, but may need a large number of degrees](https://reader036.fdocuments.in/reader036/viewer/2022062908/5ad41ab97f8b9a482c8ea59c/html5/thumbnails/1.jpg)
September 24, 2014
Modular and Expandable
CDC ROADMs
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OUTLINE
• Why CDC ROADMs?
-- Together with coherent detection systems, set the foundation for SDN
• Evolution of ROADM architectures
• Port-expandable modular multicast switch cards
- Pay-as-you-grow add/drop ports
• Degree-expandable modular multicast switch cards
- Pay-as-you-grow degree expansion
• Summary
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Carriers’ Need for Agile ROADMs
● Wavelength Provisioning
– Opex Reduction
• Service time reduced to seconds/minutes
• Once installed, no more re-wiring!
– Network rebalancing or routing re-optimization
– Maintenance switching
● Network Restoration
– Tune l around fiber cuts or equipment outages
(e.g., 1:n protection)96 l’s
96 l’s96 l’s
96 l’s
96 l’s 96 l’s
96 l’s
96 l’s
DWDM/ROADMCore Router
(4-deg)
Core Router
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Physical Layer Enablers for Software Defined Networks
SDN
Coherent
Transmission
CDC ROADM
Switching
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SDN requires Predictable Transmission Performance in Meshed Networks
Unpredictable Performance
(10G, 40G)
Predictable Performance
(100G Coherent Systems)
Data rates, modulation formats 28~32Gbaud, DP-QPSK
(112~128 Gb/s)
Standardized by ITU-T and OIF
Chromatic dispersion penalty due to
different paths and fibers
±40,000 ps/nm
( > 2,300km SSMF)
Polarization mode dispersion penalty
due to different paths and fibers
100 ps
(good for ULH, and metro with new or
old fibers)
OSNR requirement < 16 dB
≥100Gb/s coherent systems are predictable,
enabling software-defined networks
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Coherent Detection Enables Low-Cost Colorless Drop
● No optical pre-filtering (e.g., demux, tunable filter)
● 100G/400G data rates enable lower $$/Gbps/Port
Coherent Receiver is an integrated part of a CDC-ROADM
No
channel-filter
LO
ICR
OSNR< 0.5 dB
for up to 80 co-incident channels
(Nelson, et al, IPC 2012)
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ROADM Architecture
Evolution
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PS
PS
WSS
WSS
WSS
WSS
ROADM Architecture – Express Directions (I)
PS
PS
Broadcast and Select - CD
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PS
PS
WSS
WSS
WSS
WSS
WSS
WSS
WSS
WSS
ROADM Architecture – Express Directions (II)
Route and Select - CD
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Express Direction (Colorless and Directionless) Contention always happens
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
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PS
PS
WSS
WSS
WSS
WSS
WSS
WSS
WSS
WSS
Colored Add/Drop
AWG
AWG
40-88 drop ports
40-88 add ports
Route and Select with colored add/drop
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PS
WSS
WSS
WSS
WSS
WSS
WSS
WSS
WSS
PC
PS
PS
PC
Colorless & Directionless Add/Drop with Contention
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CDC ROADM
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PS
WSS
WSS
WSS
WSS
WSS
WSS
WSS
4-Degree CDC ROADM Architecture
WSS
3% drop ratio1
1x16 1x16
16 (4x1)
Switches2 15 16
1x16 1x16
Number of Degrees
Number of Drop Ports
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Port Expansion: 16 32 48 ….
EDFAs
3% drop ratio1
1x16 1x16
16 (4x1)
Switches2 25 16
1x16 1x16
Express
1xN WSS
Express
Messy connection,
but integrated on
PLC (no shock &
vibration concerns)
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Predictable Agile Transport Network (add/drop) CDC ROADM in a meshed network
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM
ROADM • ROADM degrees: 8~12
• Wavelength per degree: ≤ 96
• Add/drop to/from multi-degrees implies a
few hundred wavelengths add/drop per node
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Metro CDC ROADM
● Metro optical network requires much smaller number of add/drop ports of 100Gb/s coherent data
● Metro network node may have traffic in ≤16~20 directions
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Degree-Expandable
CDC ROADMs
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Degree Expansion: 4x16 8x16 12x16
Expansion
ports
4x16 MCS
1x16PS
1x16PS
1x16PS
1x16PS
4x16 MCS
1x16PS
1x16PS
1x16PS
1x16PS
Expansion
ports
4x16 MCS
1x16PS
1x16PS
1x16PS
1x16PS
Expansion
ports
#1 #2 #15 #16
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Degree Scalability Example: from 4 to 12
4x16 MCS
MPO (1-4)
4x16 MCS
MPO (5-8)
4x16 MCS
MPO (9-12)
MPOMPO
MPOMPO
MPO
MPO
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4x16 Degree-Expandable Multicast Switch (Add + Drop)
Degree ports
(4+4)
16 ADD ports
16 ADD Upgrade ports
16 DROP Upgrade ports
16 DROP ports
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Summary
● Future SDN relies on optical transport networks with predictablephysical layer performance
– Transmission: ≥100Gb/s Coherent Systems
– Switching (express): CD ROADMs- WSS based
– Switching (add/drop): CDC ROADMs – multicast switch based
● Metro CDC ROADM requires a small number of add/drop ports, but may need a large number of degrees
● Based on a small granular 4x16 MCS with both port- and degree-expandability, an excellent pay-as-you-grow economics can be achieved