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BENEFITS OF EDGE ROADMS IN RURAL CARRIER NETWORKSCoriant Brings Cost-Effective ROADM Technology to the Edge of the Network
In the past, the initial cost of ROADM technology has prevented service
providers such as rural carrier network operators from implementing the most
operationally efficient solution in lieu of a lower cost fixed filter solution. This
also limited the service provider to implementing a 4- or 8-channel optical
add/drop architecture without a clear migration path to higher channel
counts, and without a large amount of technology upgrades. With the ROADM
solutions developed by Coriant, these issues are addressed. The Coriant
single-slot high density ROADM has industry-leading density for multi-degree
applications. Coriant’s edge ROADM provides most of the operational
efficiencies of a traditional ROADM at the cost of a fixed filter solution.
| BENEFITS OF EDGE ROADMS IN RURAL CARRIER NETWORKS2
THE BENEFITS OF ROADMsROADMs provide numerous network benefits including facilitating trouble-shooting and reducing
network complexity. However, the three primary and most significant benefits provided by ROADM-based
networks are:
■ Accelerated service activation times
■ Reduced regeneration costs
■ Improved network reliability
By eliminating manual intervention and dramatically simplifying network engineering, it is easy to
see how ROADMs can dramatically accelerate service activation times – often by as much as 80%.
Additionally, because ROADMs can balance signal power levels more accurately than manual balancing,
they provide better overall optical performance in the network. This improved optical performance will
result in a reduction in the number of times a signal will require costly electrical regeneration before
reaching its destination. Elimination of these expensive electrical regeneration points can save as much
as 30% in equipment costs. Finally, based on network studies, a full 75% of service interruptions in a
typical network are the result of human error. Because ROADMs eliminate a great majority of the manual
and physical interaction when activating services, they have proven to reduce service interruptions by
as much as 63%.
ROADMs enable turning up services without any visits to intermediate locations and without any manual power balancing
The automated balancing provided by ROADMs results in better optical performance and hence less money spent on optical regeneration
Dramatically reducing the manual e�ort in service activation coupled with automatic precise power adjustments has proven to dramatically reduce service interruptions
SERVICE ACTIVATION TIMES NETWORK COSTS SERVICE INTERRUPTIONS
80%Improvement
Fixed Filter ROADM Fixed Filter ROADM Fixed Filter ROADM
60% REDUCTION30% SAVINGS
$
$
$
$
$
Figure 1: Key Benefits of ROADMs
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THE ECONOMIC CHALLENGE OF TRADITIONAL ROADMsTo attain this level of automation, ROADMs are comprised of a number of different components that
provide the various monitoring, amplification, balancing, and optical switching capabilities. As a result,
ROADMs have traditionally been fairly expensive compared to fixed-filter solutions – particularly the cost
of initial deployment. Historically, a ROADM degree could cost as much as 2 to 3 times that of a fixed filter.
This has resulted in ROADMs being primarily deployed only in large networks with a significant amount of
bandwidth.
SP
LIT
TE
R
InputAmplifier
OutputAmplifier
Power Monitor
Supervisory Channel
WavelengthSelectable
Switch (WSS)
TYPICAL ROADM DEGREE
Figure 2: Typical Architecture for a Single ROADM Degree
OPTICAL EXPRESS INNOVATION FROM CORIANTWith the rapid rise in bandwidth requirements, the benefits provided by Optical Express capabilities are
becoming more essential in a greater number and wider variety of networks. Optical Express-enabling
technology innovation has been a focus at Coriant for a number of years. To that end, Coriant has
developed several innovative solutions to reduce the overall cost and the first cost of technology to enable
Optical Express capabilities.
INDUSTRY’S HIGHEST DENSITY MULTI-DEGREE ROADMThe first of these solutions is Coriant’s industry-leading, highly-integrated, multi-degree core ROADM
solution – the OADM-88-8D. With the OADM-88-8D, Coriant provides a complete ROADM degree with all
of the necessary components packaged into a single-slot module that, at .83 RU per degree, provides – by
a considerable margin – the highest density 8-degree ROADM solution in the industry.
| BENEFITS OF EDGE ROADMS IN RURAL CARRIER NETWORKS4
When deployed in the 6-slot Coriant® 7100 Nano™ Packet Optical Transport Platform, the OADM-88-
8D can provide 6 degrees in a single 5-rack unit shelf or 2 degrees with 4 slots remaining for service
modules. Supporting up to a total of 8 degrees (across two shelves), 88 channels, and colorless and
directionless options, the OADM-88-8D is the ideal solution for dense metro, regional, mesh-based, and
select long haul network applications.
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Vendor B
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Coriant
Figure 3: ROADM Density Comparison (rack units per degree)
CORIANT 7100 NANO PACKET OPTICAL TRANSPORT PLATFORM
CORIANT 7100 NANO PACKET OPTICAL TRANSPORT PLATFORM
INTERFACE CARD
INTERFACE CARD
INTERFACE CARD
INTERFACE CARDCoriant 7100 Nano with• Two Single-slot OADM-88-8D• 4 Interface Slots• 20x10G (HDTG)• 2x100G (HGTM)
Coriant 7100 Nano with(6) Single-slot OADM-88-8DROADM Modules
Figure 4: OADM-88-8D – Highest Density, Multi-degree ROADM Solution in the Industry
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FLEXIBLE, COST-EFFECTIVE AUTOMATED EDGE OADMOne of the biggest challenges with ROADM solutions is the cost of the Wavelength Selectable Switch
(WSS) technology, which is the key enabling technology of traditional ROADMs. This has prevented many
network operators from deploying ROADM-based solutions, or has restricted ROADM deployments to only
very high-density core metro and/or regional networks. With the Coriant Automated Edge OADM (OADMF8)
solution, Coriant has taken an innovative approach to enabling the extension of Optical Express capabilities
to more networks, as well as extending deployment closer to the network edge. The OADMF8 provides all
of the best aspects of a ROADM solution including per-channel power balancing, variable gain amplification,
and operationally-efficient Optical Express capabilities – without the high cost of WSS-based devices. The
OADMF8 supports 44 channels of total capacity with the ability to add and drop up to 8 wavelengths. As with
the multi-degree core ROADM (OADM-88-8D), the OADMF8 is a single-slot module and is supported by the
7100 Nano Packet Optical Transport Platform.
CORIANT INNOVATION – EMPOWERING COST-EFFICIENT OPTICAL EXPRESSFigure 6 highlights the impact that Coriant’s multi-degree core ROADM-on-a-blade and cost-optimized
Automated Edge OADM solutions have had in driving down the cost of, and improving access to, operations-
friendly Optical Express capabilities.
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OADMF8
TRANSPONDER
CH. 1 TUNED WAVELENGTH
CLIENTATTACHMENTS
CLIENTATTACHMENTS
TRANSPONDER
36λ EXPRESS CONNECTION
44λ DEGREEWEST (B)
44λ DEGREEEAST (A)
OADMF8
Figure 5: Coriant Automated Edge OADM (OADMF8)
| BENEFITS OF EDGE ROADMS IN RURAL CARRIER NETWORKS6
CORIANT® 7100 NANO™ PACKET OPTICAL TRANSPORT SOLUTIONBoth the multi-degree core ROADM and Automated Edge OADM are supported on the industry-
leading Coriant® 7100 Nano™ Packet Optical Transport Platform. The 7100 Nano is a flexible 5-rack
unit, 6-slot transport platform that supports grey light, passive DWDM, Automated Edge OADM, and
multi-degree ROADM configurations – while providing a seamless and cost-efficient migration path
from one configuration to another. This capability enables network operators to begin by deploying
the exact technology needed at any given time – grey light, passive, or Automated Edge OADM – and
then seamlessly and easily upgrade to any other configuration effectively creating a solution that can
dynamically evolve as network requirements change.
In addition to a seamlessly scalable optical layer, the 7100 Nano supports a wide variety of service
interface cards including 10G/40G/100G transponders and muxponders, SONET/SDH grooming modules,
OTN grooming modules, and packet-grooming modules. The 7100 Nano also features a meshed
backplane which enables non-blocking grooming across all modules without incurring the upfront
expense of a central switch fabric.
Overall, the 7100 Nano provides network operators with the industry’s single most flexible metro/
regional transport solution based on an innovative, cost effective, and seamlessly scalable optical layer
coupled with a myriad of flexible electrical grooming mechanisms and fabric-less switching via a meshed
backplane.
STA
RT-U
P C
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T
‘09
PASSIVE DWDM
CORIANT EDGE ROADM
MULTI-DEGREE WSS-BASED ROADM
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‘10 ‘11 ‘12 ‘13 ‘14 ‘15
1 / Coriant introduces the first multi-degree ROADM-on-a-blade
2 / Coriant introduces industry’s highest-density, single-slot multi-degree ROADM-on-a-blade
3 / Coriant introduces innovative Automated Edge OADM
Figure 6: Reducing Network Cost and Complexity with Coriant Optical Express Solutions
7
FOUNDATION FOR SUCCESSFUL SDN IMPLEMENTATIONSSoftware Defined Networking (SDN) provides the ability to more dynamically control services in multi-
layer networks. However, dynamic control capabilities will always be limited by the actual connectivity
capabilities of the underlying network that SDN solutions are controlling. Optical Express capabilities – the
ability to easily, quickly, and flexibly provide connectivity between any locations in a network – provide an
agile foundation for the kind of flexibility that will be necessary for any successful implementation of SDN
CONCLUSIONAs network operators struggle with designing future-proof transport networks capable of efficiently and
cost-effectively supporting traffic growth without impacting service profitability or unreasonably burdening
their operational organizations, enabling Optical Express capabilities will become more and more vital. With
significant advancements in ROADM technology, coupled with the innovative solutions provided by Coriant
such as the Automated Edge OADM, cost-effective and operationally friendly Optical Express capabilities
are now accessible to a wider variety of networks and can be extended closer to the network edge.
PACKET
OTN
100G
10G
SPM
MUX/DEMUX
Grey Light System120G MSPP, 120G OTN SWITCH,
552G PACKET SWITCH
Passive DWDM12X100G, 80X10G
7100 NANO SHELF OVERVIEW
Low Cost–Small Form Factor
Seamless Growth
4/8 Degrees88 Channels per Degree
w/ Full Add/Drop
Cost E�ective Edge ROADMW/ EXPANSION PORT SHELF
Multi-Degree Core ROADMW/ TWO EXPANSION PORT SHELVES
FLEXIBLE SCALABLE PLATFORM
• Universal Shelf architecture
• 480G Transparent; 120G OTN; 552G Packet
• 6 Slots per shelf - 8 shelves per system
FULL INTELLIGENT SERVICES LAYER SUPPORT
• 10G, 40G, & 100G Transparent
• SONET/SDH, Packet, OTN Switching
• Full shelf fabric-less grooming via meshed backplane
ROADM
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Figure 7: Coriant 7100 Nano – Flexible Foundation for Optical Express
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ABOUT CORIANTCoriant delivers innovative, dynamic networking solutions for a fast-changing business world. The
Coriant portfolio of SDN-enabled, edge-to-core transport solutions enables network operators to reduce
operational complexity, improve utilization of multi-layer network resources, and create new revenue
opportunities. Coriant serves leading network operators around the world, including mobile and fixed line
service providers, content providers, data center operators, cable MSOs, large enterprises, government
agencies, financial institutions, and utility companies. With a distinguished heritage of technology
innovation and service excellence, forged by over 35 years of experience and expertise in Tier 1 carrier
networks, Coriant is helping its global customers maximize the value of their network infrastructure as
demand for bandwidth explodes and the communications needs of businesses and consumers continue
to evolve. Learn more at www.coriant.com.
These trademarks are owned by Coriant or its affiliates: Coriant®, Coriant Dynamic Optical Cloud™, mTera™ , Nano™, Pico™, and Coriant Transcend™. Other trademarks are the property of their respective owners. Statements herein may contain projections regarding future products, features, or technology and resulting commercial or technical benefits, which may or may not occur. This publication does not constitute legal obligation to deliver any material, code, or functionality. This document does not modify or supplement any product specifications or warranties. Copyright © 2018 Coriant. All Rights Reserved. 74C.0042 Rev. B 01/18