Our APRICOT 2019 presentation delivered by Rocky Zhou explored the optical technologies that are driving the transformation in metro networking. Open line systems are supporting best-in-class equipment deployment and optimized ROADM solutions are enabling deployment simplicity, space and power efficiency, and low first-in-cost. What's more, next-gen coherent solutions are revolutionizing metro capacity-reach options, delivering significant cost savings and service flexibility.

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

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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

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• 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

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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

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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
Gbit/s
400
GbE
NMS
Optical layer OLS
Domain Controller
API
API

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Metro OLS pitfalls
“ROADMs are not needed
in nodes with a low
number of add/drop
wavelengths” “Contentionless ROADMs
are needed everywhere”
“ROADMs cannot be
deployed in street
cabinets”

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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”

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Massive investment and focus on degree-2 ROADMs
Metro networks need two types of ROADM
Source: OVUM Optical Networks Forecast January 2019

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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

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• 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

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Leveraging coherent modulation terminals

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Higher-order modulation
Increasing constellation at cost of noise performance
DSP technology
QPSK
8QAM
16QAM
32QAM
64QAM
Theoretical performance
12dB

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Trading off reach vs. bandwidth
Significant performance steps with standard mQAM constellations
DSP technology

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Optimizing modulation
Higher modulation requires higher (O)SNR
DSP technology
Linear channel

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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

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Unprecedented network flexibility
Software-defined transmission
Configure constellation and
baud rate for selected data rate
• 100-600Gbit/s
• Multiple basic modulation
formats per data rate
• Fine granular optimization
by symbol interleaving
Optimize channel based on
receive OSNR and spectral
shaping due to ROADMs and
filters
Maximum capacity and reach for any network

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Unprecedented network flexibility
Software-defined transmission
300Gbit/s 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 choosing 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

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Disaggregation today

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Disaggregation – operator concepts and 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

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Disaggregation challenges
• Optical network consists of many inhomogeneous network elements
• Amplifier, WSS, wavelength blocker,
• ROADMs can have very different levels of flexibility and internal constraints
• Colorless, directionless, contentionless, add/drop, …
• Especially in cost-sensitive metro network environments constrained technologies
are often used (filterless / fixed filter ROADMs, non-colorless, …)
• Data models must be abstract to allow future technology advances
• Number of data models should be limited to allow interoperability testing

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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

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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

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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 (high street 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 vendor’s optical
domains

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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
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