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Reconfigurable Optical Networksusing WSS based ROADMs

Steven D. Robinson

VP, Product Managementsrobinson@meriton.com

Five Essential Elements of the NG Optical Network

. . . moving from static networks to dynamic networks

What does a ROADM do? Which type is better?

Key Technologies for 3rdGeneration ROADM systems

OEO vs. All Optical ROADMs

Digital ROADM Hybrid Solution

Intelligent Electrical & Optical Switching

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Reconfigurability Simple, Flexible, Self Maintaining Systems

Pay as You Grow Scalability Start with 1 , grow by 1

Seamless upgrade to 100G (efficiently)

Aggregation & Sub-Switching Integrated ADM-on-a-blade, High BW efficiency

Multi-Degree Operation Both Optical & Electrical Multi-degree Options

Automated Network Planning One time Node Engineering, GMPLS Control

and Management Systems Plane & True Point-and-Click Provisioning

Five Essential Elements ofNext Generation Optical Networks

ROADM

OPM

OPM

Mux Mux

ADM ADM

West East

Design Networks

in Minutes

Up to 16 degrees

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What is a ROADM?

DROPsADDs

ROADMModule

O

P

M

ROADMModule

Key attributes of ROADM Module

Fully Flexible, Remotely Reconfigurable Optical Add Drop

Automatic power equalization on inputs, outputs, adds, drops

Optical Power Monitoring (OPM) of all channels

Reconfigurable OpticalAdd/Drop Multiplexer (ROADM)

Key benefits of ROADM Module

Elimination of the OEO Pass-through tax

Scaleable Bandwidth (Start with 1 , grow by 1 )

Single Wavelength Granularity No stranded bandwidth

Fully Automated Optical Layer

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WDM Optical Transport Technology Options

Fixed PortROADM

FOADM

Multi-Degree WSS ROADMwith colorless ports

Fully FlexibleMulti-degree

ROADM

Per Optical Switch

Multi-port Mux/Demux

OPM

Drops

OPM

Multi-Degree WSS

with fixed filters

Fixeddrops

OPM

PerOptical Switc

h

Multi-port Mux/Demux

OPM

FixedAdds

2 Degree ROADMBlocker/IPLC

with fixed filtersOPM

Splitter /Drop filte

rs

Add Filters/Combiner

O

P

M

WB Module

OEO Regen(Point-to-point

DWDM)

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Which ROADM Technology is best?Full Flexible, WSS based ROADMs

Wavelength Selective Switch (WSS) ROADM:

Utilizes a single element to multiplex AND demux all express andall add/drop wavelengths

Contains a built-in Optical Switch which can direct/select one or more wavelengths to/from any port

Provides Automated, per channel equalization on all wavelengths

Typically includes full Optical Power Monitoring on all wavelengths

Can be configured for truly colorless portsfor widely tunable lasers & dynamic wavelength

management

Can be modular (low first in costs) or fully installed on day one

Key * Manages all wavelengths

Features: * Lower system cost

* No OEO Pass-thru tax

* Fully Flexible Ports enable:

Any wavelength to any port

Supports Tunable lasersDynamic Management

Jumper-less provisioning

* Multiple wavelengths/ drop port

Mesh node capability

Ring interconnection

MP-WSS

FlexibleDrops

Flexible Adds

WSS

1 3 5 + 74

OPM

ROADM MODULE

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Key Technologies used in CoreReconfigurable Networks

Fully Flexible WSS

ROADMs

ROADM Systems provide much more than just Wavelength Reconfigurability

They provide a total Agile Optical Network Solution

Integrated Platforms

Rapid

Automated Network

Planning

Cross Optical Switch

w/ Integrated. Transport

GMPLS

Control Plane

and End-to-End

Management

Widely Tunable

LasersFully Automated

Optical Layer

Hot- PluggableSFPs & XFPs

Multi-Service

ADM-on-a-blade

Ethernet Networking

True Point-and-clickPlanning & Provisioning

AGC / Transient Controlled

Optical Amplifiers (OAs)

Integrated Optical Cabling

Flexible, Transparent

Optical Interfaces

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Why do customers like All optical

13 14 15 16 17 18 19 20 21 1-12

Source

321

21

0

1

2

3

4

5

6

7

RelativeCost,$

All Optical All OEO

OEO becomes more expensive as the node count goes up

(# Regens x # nodes)

OEO becomes more expensive as the number of

wavelengths increases (# WL x # Regens x #nodes)

Use of Analog Optical Amplifiers lowers costunless you

need to drop traffic

21 21 20 20 19 19 18 18 17 17 16 16 15 15 14 14 13 13 12 12

All OEO or Digital Transport: At least 380 Transponders

ILA

All Optical ROADM : 42 Transponders

21 121

1

1

1

1

1

1

1

1

ILA

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OEO or ROADMWhich is the better choice?

Decision depends on:

Bit Rate; Number of Wavelengths

Topology & Traffic Patterns

Switching Need (which determines # of pass-thrus vs # of drops)

Size (# nodes and span length) Amplify? Regen?

Total Cost of Ownership (OPEX vs. CAPEX)

ROADM

2 4 6 8 10 12 14 16 18

40 Gb/s

Number of Pass-Thru Channels

BitRate

10 Gb/s

2.5 Gb/s

OEO

OEO ROADM

ROADM

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Integrated OEO (Digital Transport)Multi-Service & Investment Protection Issues

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

ATM ESCON FC1 GbE FC2 OC-48 10G 40G 100G

4 x 10G

10 x 10G

10 x 10G

Integrated Tx

OEO Regen OEO Regen OEO Regen OEO Regen

Integrated Rx

Integrated 10G OEO:

Optimized for 10G client transmission

Other services require muxing or inverse muxing (no transparent transmission)

Support for native 40G or 100G will require ripping out OEO fabric

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2.5G

2.5G

Per WL OEO

Switch

10G

10G

40G

100G

Multi-Degree

OEO Switching

Multi-degree ROADM or OEO?Why be forced to choose?

All Optical ROADM Advantages:

Fully Bit Rate Transparent1G 10G 100G

Per wavelength Scaleable

12 . . . 40

Lower Power

Fully Automated Optical Layer

Low Pass-thru costs

OEO Advantages:

Sub-Wavelength Switching

Potentially Lower Terminal Costs

(at full capacity)

Simpler Optical Engineering

Simpler Multi-Degree Operation

Multi-Degree

ROADM Switch

Digital ROADM

Node

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Digital ROADM Hybrid NodeLowest Overall Cost & Flexibility

Digital

ROADMNode

0

1

2

3

4

5

67

RelativeCost,$

All Optical Digital

ROADMHybrid

All OEO

Topology Agnostic

Traffic Pattern Agnostic

Bit Rate Agnostic

Simpler Optical Engineering

Simpler Multi-Degree Operation

Lower overall cost solution

Per WL

OEO

Switch

Multi-Degree

All Optical

ROADM

Multi-Degree

Digital

Switching

2.5G

2.5G

10G

10G

40G

100G

All Optical

Spur

All Optical

ROADM

Maintain manageable regions of transparency

TRTR

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Intelligent Optical & Electrical Switching

WSSROADM(OpticalSwitch)

Add6 GbE

Drop/Add1 GbE

ElectricalADM

ElectricalADM

Switching Options:

Pass Thru Entire Wavelength

Electrically Add/Drop on a per Service Basis

Optical DropWavelength

Optically Add/Drop Entire Wavelength

Transponderwith Electrical

ADM Switch

Mux Mux

ADM ADM

Optically Add/Drop Multiple Wavelengths (Multi-degree)

Add/Drop Multiple Services/Wavelengths forCross Wavelength Grooming & Multi-degree Switching

Cross-WLOptical Switchwith integrated

WDM

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