The document discusses metro network transformation towards smart, high-capacity infrastructure through network disaggregation and the use of new technologies like software-defined coherent optics. It describes the benefits of disaggregation including flexibility, avoidance of vendor lock-in, and support for multi-vendor environments. Several industry approaches to disaggregated network management are presented, along with recent multi-vendor trials demonstrating interoperability. Compact reconfigurable optical add-drop multiplexers and coherent modulation are highlighted as key technologies enabling capacity and reach optimization in metro networks.

1. Metro network transformation
APRICOT 2019, DAEJEON, SOUTH KOREA
Evolution towards a smart high-capacity infrastructure

2. © 2018 ADVA Optical Networking. All rights reserved.22
Flexibility to deploy the best-in-class
equipment for each network needs
OPENNESS
Remote configurable and scalable optical
layer technology at metro economics
FLEXIBILITY AND
OPERATIONAL SIMPLICITY
Grooming of low speed services for
highest spectral efficiency
COST-EFFICIENCY OF
COHERENT MODULATION
Time-sensitive optical transport compliant
with most stringent sync demands
PRECISE SYNCHRONIZATION
OF 4G, 5G, …
Drivers for metro network evolution

3. © 2018 ADVA Optical Networking. All rights reserved.33
• Triggers innovation and evolution
• Accommodates to different lifecycles
• Enables flexibility to deploy the best-in-class
equipment for each network needs
• Facilitates multi-vendor environments
• Avoids implementation lock-ins
• Integrates into open-source orchestration
systems
Disaggregation benefits
Unlocks innovation and enables flexible connectivity solutions
Openness drives disaggregation
Partial disaggregation: Terminal and OLS as separate elements
Different lifecycles of optical components
OLSTerminal Terminal
Value
Optical line system
Fiber
3 years+ 10 years+
Transponder
Depreciation

4. © 2018 ADVA Optical Networking. All rights reserved.44
Existing OLS + Third-party terminals
• Ability to transport alien wavelengths?
• Alien wavelengths supported by network planning
tool?
• SW integration for routing and alarming?
New OLS deployment + Third-party terminals
• Planning tool capable of supporting alien waves
• Efficient optical power management to maximize
transmission reach / functionality
• Network management tool with supporting open
APIs
Functional disaggregation of terminals from the line system
Partial disaggregation scenarios
Third-party
terminal
Third-party
terminalNew OLS
Third-party
terminal
Third-party
terminalExisting installed OLS

5. © 2018 ADVA Optical Networking. All rights reserved.55
Disaggregated management and orchestration
Tributary Layer
Aggregation:
E.g. Voyager
API
Packet Layer
API API
Multi-layer/vendor
Orchestration
API
VerticalDisaggregation
Horizontal Disaggregation
NMS/OSS
Transponder
Trans/Mux-
ponder
100
GbE
10
Gbps
400
GbE
NMS
Optical Layer OLS
Domain Controller
API
API

6. © 2018 ADVA Optical Networking. All rights reserved.66
Metro OLS pitfalls
“ROADMs are not needed
in nodes with a low
amount of add/drop
wavelengths” “Need for contentionless
ROADMs everywhere”
“ROADMs cannot be
deployed in street
cabinets”

7. © 2018 ADVA Optical Networking. All rights reserved.77
Metro OLS pitfalls
“ROADMs are not needed
in nodes with a low
amount of add/drop
wavelengths” “Need for contentionless
ROADMs everywhere”
“ROADMs cannot be
deployed in street
cabinets”

8. © 2018 ADVA Optical Networking. All rights reserved.88
Massive investment and focus on degree-2 ROADMs
Metro networks need two types of ROADM
Source: OVUM Optical Networks Forecast January 2019

9. © 2018 ADVA Optical Networking. All rights reserved.99
Compactness, scaling flexibility and openness are key
Metro prerequisites
Compactness
Limited availability of space
Low first-in cost
Growing with demand
Simplicity
Operational efficiency
Open design
Upgradeable for the future

10. © 2018 ADVA Optical Networking. All rights reserved.1010
• Low initial cost
• Minimum footprint
• Simple configuration and
cabling
• Remote control and
automated procedures
• Flexgrid-design supporting
advanced coherent
modulation formats
Your benefits
The perfect foundation for software-defined networking
Next-gen Metro OLS solution elements
Ultra-compact 2-degree ROADMs for on-
demand local traffic add/drop, and for automated
and remote operation
Compact in-line amplifiers for DWDM
connectivity over long or highly attenuated spans,
even in the most space-restrictive environments
Multi-degree ROADMs for remote and flexible
interconnection of metro aggregation rings with
the metro core

11. © 2018 ADVA Optical Networking. All rights reserved.1111 © 2018 ADVA Optical Networking. All rights reserved.11
Leveraging coherent modulation terminals

12. © 2018 ADVA Optical Networking. All rights reserved.1212
Higher Order Modulation
Increasing Constellation at cost of Noise Performance
DSP Technology
QPSK
8QAM
16QAM
32QAM
64QAM
Theoretical performance
12dB

13. © 2018 ADVA Optical Networking. All rights reserved.1313
Trading off Reach vs Bandwidth
Significant Performance Steps with Standard mQAM Constellations
DSP Technology

14. © 2018 ADVA Optical Networking. All rights reserved.1414
Optimizing Modulation
Higher Modulation requires Higher (O)SNR
DSP Technology
Linear channel

15. © 2018 ADVA Optical Networking. All rights reserved.1515
Coherent modulation is being extended throughout the Metro
• 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 benefits

16. © 2018 ADVA Optical Networking. All rights reserved.1616
Unprecedented Network Flexibility
Software Defined Transmission
Configure constellation & baud
rate for selected data rate
• 100-600G
• Multiple basic modulation
formats per data rate
• Fine granular optimization
by symbol interleaving
Optimize channel based on
receive OSNR & spectral
shaping due to ROADMs and
filters
Maximum capacity and reach for any network

17. © 2018 ADVA Optical Networking. All rights reserved.1717
Unprecedented Network Flexibility
Software Defined Transmission
300G example:
• 69GBd SP-16QAM yields
longest reach but requires
at least 75GHz spacing
• 34Gbd 64QAM shows
lowest bandwidth but
requires 6.3dB better OSNR
• Fine granular optimization
by chosing base modulation
format and grade of
interleaving
Fine granular adaption to passband and OSNR of the link
75GHz
17.3dB OSNR
37.5GHz
23.6dB OSNR

18. © 2018 ADVA Optical Networking. All rights reserved.1818 © 2018 ADVA Optical Networking. All rights reserved.18
Dissagregation today

19. © 2018 ADVA Optical Networking. All rights reserved.1919
Disaggregation – Operator Concepts & Vision
[U. Hölzle,
Plenary Talk,
OFC 2017 ]
https://www.youtube.com/watch?v=n9zEiGyvJ-A [M. Filer et al., JOCN,, Vol. 8, No. 7, 2016]
https://0201.nccdn.net/1_2/000/000/098/a85/Open-ROADM-whitepaper-v1-0.pdf

20. © 2018 ADVA Optical Networking. All rights reserved.2020
Disaggregation challenges
• Optical network consists of many in-homogeneous network elements
• Amplifier, WSS, Wavelength Blocker,
• ROADMs can have very different levels of flexibility and internal constraints
• Colorless, direction-less, contentionless add drop, …
• Especially in cost-sensitive metro network environments constrained technologies
are often used (filterless / fixed filters ROADMs, non-colorless, …)
• Data models must be abstract to allow future technology advances
• Number of data models should be limited to allow interoperability testing

21. © 2018 ADVA Optical Networking. All rights reserved.2121
ONF ODTN (01/2018 – 12/2018)
https://wiki.onosproject.org/display/ODTN/ODTN
21
OLS Controller
WSS TRN
OpenConfig
Open Line System (OLS)
OpenConfig
OpenConfi
gMUX WSSAMP MUXTRN
ONOS
Without OLS Controller
WSS TRN
OpenConfig
Open Line System (OLS)
OpenConfig OpenConfi
gMUX WSSAMP MUXTRN
ONOS
With OLS Controller
TAPI? OpenConfig? Else?
TAPI
Has
topology?
TAPI
Short Term Feasible Architecture
System Architecture

22. © 2018 ADVA Optical Networking. All rights reserved.2222
MetroHaul Software Architecture
https://metro-haul.eu
• Filterless Metro Network Architecture
• Hierarchical SDN control
• ONF Transport API for Open Line System via SDN DC
• OpenConfig (direct SBI or via Agent) for Transponders

23. © 2018 ADVA Optical Networking. All rights reserved.2323
SENDATE Multivendor optical SDN Trial (09/2018)
Open Disaggregated SDN Control Architecture
• Multivendor trial including Network orchestration layer,
Control and management layer and Infrastructure layer.
• Layered approach based on ONF Transport API 2.0
with extensions for Optical Performance Planning
Network Orchestration layer components include:
• Transport Orchestrator (Highstreet technologies)
• Planning Application (VPIphotonics)
(Bundled in Transport Orchestrator)
Control and Management layer:
• SDN Domain Controllers (ADVA and Coriant)
Infrastructure layer:
• ROADMs and transponders (ADVA and Coriant)
• Transparent OMS back-to-back ROADM interconnect
• Alien wavelength interconnection passing both vendors optical
domains.

24. © 2018 ADVA Optical Networking. All rights reserved.2424
New “open line systems” are driving disaggregation solutions into the market
• Ability to combine best-in-class optical line system with best-in-class terminals
Next-gen ROADM strategy can deliver:
• Compactness, Low first in cost, Simplicity, Future proof design
New coherent modulation technology enabling low cost metro transport
• Highly flexible modulation formats enable capacity-reach optimization
Multiple industry approaches to management of disaggregated networks
• One size does not fit all
• Continued drive for multi-domain (vendor and layer) solutions now resulting in mature solutions
• Multiple trials / demonstrations performed recently achieving production network quality
New technologies are driving metro networks towards smart high-capacity solutions
Summary

25. Thank you
IMPORTANT NOTICE
ADVA Optical Networking is the exclusive owner or licensee of the content, material, and information in this presentation. Any reproduction, publication or reprint, in whole or in part,
is strictly prohibited.
The information in this presentation may not be accurate, complete or up to date, and is provided without warranties or representations of any kind, either express or implied. ADVA
Optical Networking shall not be responsible for and disclaims any liability for any loss or damages, including without limitation, direct, indirect, incidental, consequential and special
damages, alleged to have been caused by or in connection with using and/or relying on the information contained in this presentation.
Copyright © for the entire content of this presentation: ADVA Optical Networking.
nrobinson@advaoptical.com