Evolution of high speed interfaces in disaggregated open networks
Stephan NeidlingerNetnod, Stockholm, March 15, 2018
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Outline
Disaggregated networks
High speed interfaces and modulation formats
Multi-layer/-vendor orchestration/management
1
2
3
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Aggregated and disaggregated networksAg
greg
ated
Fully Aggregated: Entire transport network acts as a single managed system
End to End System
API FSP Network Hypervisor
Transponder TransponderTerminal ILA ROADM Terminal
Fully Disaggregated: Everything is a separate network element
Partly Disaggregated: Transponder is one element, Open Line System (OLS) is second
Degrees
Open Line SystemDisa
ggre
gate
d
APIAPI API
APIAPIAPI API API API
IETF TEAS TE Topology
ONF Transport-API
AT&T
ONF Core Model
ONF Core Model
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Investment and depreciationValue
OpticalLine System
Fiber
Depreciation3 years+
Depreciation10 years+
Transponder
Disaggregation flexibility: Different lifecycles for line systems and terminals
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Modulation format comparison
Fiber Capacity
Size, Power and Cost
Applications
Evolution
Coherent Detection
Direct Detection
Local-oscillator (laser) at receiver, for optical phase detection. Higher-Order-Modulation.
No local oscillator (laser) at the receiver. Higher-Order-Modulation.
I
Q
Maximum spectral efficiency Reduced spectral efficiency
Complex Tx/Rx, high speed ASICs and DSPs Simpler, lower cost, lower power
Higher order QAM modulation More carriers, low cost modulation formats
Regional and long distance Shorter reach point to point metro
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Unprecedented Network Flexibility
Coherent detection
Configure constellation & baud
rate for selected data rate
• 100-600G
• 50G steps
Optimize for given channel
• based on receive OSNR &
spectral shaping due to
ROADM cascades
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Coherent evolution
200G: 2016
100G: 2011 2014 2016/17
400G: 2018 2019/20
5x7 MSA module CFP-DCO CFP2-A/DCO OSFP
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Modulation format comparison
Fiber Capacity
Size, Power and Cost
Applications
Evolution
Coherent Detection
Direct Detection
Local-oscillator (laser) at receiver, for optical phase detection. Higher-Order-Modulation.
No local oscillator (laser) at the receiver. Higher-Order-Modulation.
I
Q
Maximum spectral efficiency Reduced spectral efficiency
Complex Tx/Rx, high speed ASICs and DSPs Simpler, lower cost, lower power
Higher order QAM modulation More carriers, low cost modulation formats
Regional and long distance Shorter reach point to point metro
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• QSFP28 DWDM (non-tunable) pluggable optics (directly into switch/router)
• Dual-wavelength 2x 56Gbit/s PAM4 (non-tunable)
• Up to 4Tbit/s capacity in C-band
• Low power solution: ~4.5W
Direct Detect Pluggable
Direct detection
100GHz channel spacing 100GHz channel spacing
Each channel, made up of two wavelengths, is centered on the ITU-T 100GHz channel grid- One wavelength is offset from the grid center frequency by -25GHz- The other wavelength is offset by +25GHzè 100G of capacity in 100GHz of bandwidth
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OFC 2017 direct detect demo
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Multi-layer/-vendor orchestration/management
Optical Layer
Open Line System
APIAPI API
Packet Layer
API API
SDN Control
Orchestrator
Routers/Switches
API API
Vert
ical
Disa
ggre
gatio
n
Horizontal Disaggregation
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Control Layer
Transport SDN architectureApplication
Layer
NBI / APIs
Cloud Orchestrator
Network Orchestrator
StorageCompute
Parent Controller
DomainController
DomainController
DomainController
Infrastructure Layer
SBI
Domain 1 Domain 2 Domain 3
NE NE NE NE NE NE NE NE NE
• Diverse applications• Planning, optimization, services,
etc.
• Common framework• Multi-vendor NW SW• Routing, Resiliency
• Standard, programmatic interfaces across layers
• Open/common device data models
Common APIs
Standard Interfaces
Open Platform
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YANG data models – 'Pick and Choose'
Transport-API
Device Core Model
IA
Infrastructure
Network
ServicesIETF Network
IETF Network-
Topology
IETF TE Topology
IETF WSON
Technology
IETF Flexi-Grid TED
IETF Flexi-Grid media
channel
IETF TE Tunnels
Co
mm
on
Optical
Transport
Telemetry
SDO
Device
Network
Services
To
po
log
y
Pa
th
Co
mp
uta
tio
n
Vir
tua
l Ne
two
rk
No
tifi
cati
on
Co
nn
ect
ivit
y
Carrier ISPs, IP over Optical Web 2.0 Disaggregation
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Key take-aways
• Disaggregation will increase network flexibility and reduce vendor dependency
• Partial disaggregation will reduce network operator integration efforts
• High speed interfaces and higher order modulation need to be supported by open optical line systems (wavelength grid, optical impairments compensation, …)
• Multi-layer and -vendor orchestration/management is keyfor real network deployments
Thank you
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