Stephen Rettenberger's NGON & DCI World presentation looked at the increasing value of open line systems for unlocking spectrum, as well as the latest innovation in AI-based automation providing new opportunities for optical networks.

1. Open optical networks:
From lowest TCO to new revenue generation
Stephan Rettenberger
August 2020

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Open optical systems – a pragmatic approach
Terminal Terminal
OLS
Value
Open line systemFiber
3 years+
10 years+
Transponder
Depreciation

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Market dynamics driving change
… but still a relevant number of legacy OLS
deployments with fixed grid
Open line system with flexgrid ROADMs enabling
higher baud rates and subcarrier approaches
400G ZR
pluggables on
routers/switches
Transponders/
muxponders with
higher baud rates
and 1200Gbit/s
Client side: 100GbE predominant; 400GbE in DCI
Lower-speed services still relevant
Mix of services
Third-party
wavelengths
support
Open line systemTerminals

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From lowest cost per Gigabit mile to new revenue generation
Optical networking – more than plumbing?
Management
Terminals
Line system
Necessary evil
Innovation focus
Common equipment
Automation
Utilizing spectrum
Unlocking spectrum
Old world
New world
SDN, ML, AI
Shannon
limit
New services

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• Carriers can sell unused spectrum
• Demarcation between optical
domains without regeneration
• SW control of spectrum services
• New class of wholesale service
• Optical spectrum is segmented into slices,
which can be assigned to different users and
applications
Monetize unused spectrum and provide differentiated wholesale services
Spectrum as a service – new business opportunity
BENEFITS

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Spectrum services in action
Open terminal Open terminal
Netconf/Yang NETCONF/YANG
Optimum
configuration
Optimum
configuration
Live long-haul network
Spectrum Service
BWopt , GSNR, PTX , PRX
Open line system (OLS)
Distance Data rate Format Bits/symbol
1016km 500G DP-32QAM 5
1792km 400G DP-16QAM/DP-32QAM 4.5
2943km 300G DP-16QAM/DP-P-16QAM 3.5
3751km 300G DP-16QAM 3
5738km 200G DP-QPSK/DP-P-16QAM 2.5
2019

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Greenfield metro DCI
• 600G per lambda
• 75GHz channel spacing with
AWG filters
• 38.4Tbit/s fiber capacity
Flexgrid brownfield
• Maximum baud rate with
Flexgrid ROADMs
• 75…100GHz channel spacing
• High reach 200-400G LH/ULH
Fixgrid brownfield
• 200-300G for 50GHz spacing
• Ultra flexible modulation
enables filling the passband
Maximizing the utilization of your fiber plant
Physical interoperation between terminals and OLS
Ultra-flexible modulation adapts to any infrastructure
400G 300G200G
600G

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From fractional QAM to 800G and 1200G
Open terminal
Dual-core processing
Multi-service
Fractional QAM
Shaping
MLG support
Optimizing spectral efficiency close to the Shannon limit
Open terminal: maximizing spectrum utilization
Wide service range
• 100GE and 400GE
• MicroMux support 10x 10GE
• Ready for FlexE
High baud rate by dual carrier
• World‘s longest reach 400G
with QPSK
• 1200G channel
Dual port legacy upgrade
• Fit 50/75/100GHz spacing
• Pay as you grow
Maximum density DCI
• 1.2T per device, 3.6T per RU
• Trade reach with capacity

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Operating disaggregated optical networks
End-to-end network management is key
Terminal
OLS
OSS/control/orchestration
NBI
Terminal
Ensemble
Controller
Terminal
OLS
OSS/control/orchestration
Terminal
Ensemble
Controller
Terminal
OLS
OSS/control/orchestration
Terminal
Ensemble
Controller
Scenario 1 Scenario 2 Scenario 3
ADVA ADVA ADVA ADVA ADVA ADVAThird-partyThird-party Third-party
NBI NBI

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Machines learn from networks and can initiate early action  higher availability
ADVA network analytics
Input In-house storage Predictive modelling Dashboard Distribute
JSON
CSV
Warnings
Suspicious data
Customer
A
Customer
B
Customer
C

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ML and AI: predictive maintenance
Time
Bit errors
Performance measures of many optical pluggables
combining several customer networks
2. Maintenance window scheduled
3. Pluggable managed replacement
- Bit errors drop back to acceptable levels
- No unexpected traffic outage thanks to
predictive maintenance
1. Optical pluggable reporting errors;
- Bit errors are on the rise
- The shape of the curve is an early
indicator that the HW will fail (pattern
detection through ML)

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Open optical networks – from plumbing to new opportunities
Summary
Open
optical
networks
Innovation
• Line systems increasingly valuable, unlocking spectrum
• Flexible terminals maximize utilization in all applications
Interworking
• Physical layer interop more sophisticated
• APIs and SDN enable end-to-end control
Customer focus
• Not all networks are created equal
• Operator skills determine services models
Low touch
• Automation and ease-of-use
• Machine learning and AI starting to add value

13. Thank you
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srettenberger@adva.com