At Netnod Meeting in Stockholm, Torbjörn Rium explored the latest transmission technology set to enable dynamic capacity that adapts to connectivity network conditions. He discussed the potential of software-defined optics to optimize transmission bandwidth between nodes depending on parameters like link distance and quality. Torbjörn also outlined how higher-layer applications will be able to utilize these dynamic bandwidth offerings, adapting traffic and content flow to available bandwidth, as well as the role that SDN and APIs will play in enabling the necessary communication between lower connectivity and higher application layers.

1. Torbjörn Rium
Stockholm, April 2019
Netnod Meeting 2019
Why should higher-layer applications care
about software-defined optics?

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So what‘s behind these lines between network nodes?
Optical networks are often not seen by application layers

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Outline
Advances in optical communications1
2 Application programming interfaces between layers

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Advances in optical communications

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This will change going forward …
Optical networks so far …
Fixed optical layer
• Rigid channel grid
• Limited reconfiguration
Fixed interfaces
• Fixed data rate
• Fixed modulation & FEC
• Fixed bandwidth
Static connectivity
• Permanent connections
• (Semi-)manual set-up
ch. #1 #2 #3 #4 #5

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Dependency between modulation scheme, bit rate, reach
Some background for understanding analog optics
Terminal Optical amplifier Optical amplifier Terminal
• Signal-to-noise
ratio degradation
through optical
amplifiers
• Higher-order
modulation
schemes

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• Better spectrum utilization
• Adaptation to reach requirements
• Lower cost-per-bit transport
• More simple and cost-effective designs
• Continuous innovation
Software-defined coherent optics drive efficiency and flexibility
Coherent modulation options and benefits

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Optimization potential by applications
Modulation scheme, bit rate, reach
Lower cost per bit
Metro ptp
DCI
Metro core
LH core

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Communication between optical and application layers for optimizing traffic flow
Networking example: optical restoration
Original working path: 300Gbit/s
Restored path: 200Gbit/s
1. Original working path
allows for 300Gbit/s
2. Fiber break in working
path
3. Optical restoration
leads to longer path
4. Restored path
supports 200Gbit/s
only

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Fixed optical layer
• Rigid channel grid
• Limited reconfiguration
Fixed interfaces
• Fixed data rate
• Fixed modulation & FEC
• Fixed bandwidth
Static connectivity
• Permanent connections
• (Semi-)manual set-up
Programmable optical layer
• Flexible channel grid
• Full reconfiguration
Software-defined transceivers
• Variable data rate
• Adaptive modulation & FEC
• Variable bandwidth
Zero touch programmability
• SLA-based dynamic connections
• Fully automated set-up
Software-defined optics
ch. #1 #2 #3 #4

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Application programming interfaces
between layers

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Hierarchical multi-domain SDN architecture
OSS/BSS
SDN (multi-domain) controller/orchestrator
SDN domain controller A SDN domain controller B
Network
management
system
Network
elements
Service
lifecycle
orchestration
layer
Network level
APIs
Proprietary
models
Device level
APIs
Domain A Domain B Domain C

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ONF open disaggregated transport network (ODTN) demo
OFC 2019

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T-SDN as an enabler for new optical network services
Optical spectrum services
Bandwidth
as a service
Wavelength
as a service
Optical spectrum
as a service
“I need a
10GbE
connection
from A to Z“
“I need a
wavelength
channel
from B to G“
“I need 75GHz of
contiguous
spectrum from E
to W“

15. Thank you
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