emerging trends and applications for cost effective roadms

© Finisar Corporation Confidential 1

Ken Garrett

Emerging Trends and Applications for Cost Effective ROADMs


Increasing Network Agility ROADM Network Applications

ROADM implementation

• Wireline• MSOData Centers

Wireless Backhaul• Utilities


WSS/ROADM Demand Continues to GrowHigher Port Count WSS fastest growing area in the next 3 years

CY05 CY06 CY07 CY08 CY09 CY10 CY11 CY12 CY13 CY14 CY15 CY16 CY17 CY18 CY190

10,000

20,000

30,000

40,000

50,000

60,000

70,000

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

WSS (1x4 or less) WSS (1x5 to 1x9) WSS (1x10 or larger) 1x5 or larger + 1x10 or larger (%)

Uni

ts (T

hous

ands

)

Perc

ent o

f WSS

Com

pone

nt U

nits

Source: Infonetics Research May 2015


1998 COADM 2X2 switches and 8-16 channel mux/demux Colored Add/Drop High Cost Limited Add/Drop

1999 - 2001 Wavelength Blocker LC Array Technology Colored Add Drop Gain Equalization High Cost

2003-2012 WSS & PLC ROADMs 100 GHz & 50GHz Colored and Colorless ADD/Drop Fixed Grid 50 GHz &100GHz Network Deployments MEMS- LC- LCoS-PLC 1X2-1X9-1X16-1X20 Colorless and Directionless Applications Cost Reduced 70% since 2005 Multiple Suppliers

The Next Generation

ROADM Evolution – 4 Generations in 17 years

WSS Price/Port

2000 2014


Colorless and Directionless Multiplexing / Demultiplexing Enables critical wavelength and route flexibility Contentionless as an “optional” enhancement

High Performance for 100G and Beyond High wavelength isolation for higher modulation formats High bandwidth cascadability

Flexgrid Channel Transmission WSS, OCM, flexgrid multiplexing / demultiplexing Intra-channel power measurement and equalization

Scalability for Large and Small Nodes High Port Count and Dual WSS 8 – 16 node degrees 4 – 8 node degrees

Low Cost Vertical Integration (Dual WSS- 2 in one) Functional Integration (ROADM on a single slot card) Lower Cost Add/Drop for CD (MXN WSS)

Next Generation ROADM Network Features


Reconfigurable Optical Add Drop Multiplexer

Enables all-optical routing of individual wavelength channels through a node

Express routing Add/drop Wavelength channel power leveling

All-optical: Avoid cost and power consumption

of O-E-O on express paths

Remote configurability: Rapid circuit provisioning Reconfigure network in response to

link or node failures Lower maintenance and operations

costs

Functionality Benefits

ROADMs: Basic functionality

To Node B

To Node C

Local add/drop ports


Regional / Long Hall Mesh DWDM 50 GHz, Flexgrid™ 100G/400G transmission 4 to 20-degree ROADM CD/CDC Restoration/40G-100G Overlay 40/100G Overlay High power amps / Raman

Metro/Regional Ring or mesh 10G/100G/400G transmission 2-20 degree ROADM Restoration Multiple Coherent Modulations 40G/100G Overlay Wireless Backhaul

Metro Access CWDM or DWDM 50/100 GHz 1G/2.5G/10G/100G transmission Fixed OADM / ROADM MESH + RING Wireless Backhaul

High Speed and Packet

Business Services

Triple Play

3G and LTE

ROADM Application


RECONFIGURABLE CDC ROADM Wavelength Routing

ApolloOPT9624

TRP

9D-ROADM(100 and 50Ghz spacing)

2D-ROADM(100 and 50Ghz spacing)

Transmit any wavelength from any local port

Colorless

Transmit the same wavelength simultaneously to more than one directions

Contentionless

Transmit any wavelength to any direction

Directionless

TRP

• Most efficient use of spectrum

• Ready for 400Gbps and 1Tbps

Moving to “Gridless” Flexible Spectrum

Uncompromised ability to route any wavelength anywhere in the network, with most efficient spectrum use

ROADMS serve as a transport solution for SDN and NFV implementation


Data Center Interconnect-Example of an agile SDN –NFV type network application

DC Site1

DC Site2

DC1/DC2 Interconnect provisioned pathContent consumption provisioned path

Alternate path for a temporary period

Control

ContentConsumer(e.g. University)

Connect DC1 to DC2 in highest priority

Resume to “normal” configuration

“OK”

Data Center Manager


Broadcast and Select ROADM

Passive split on Drop-side

WSS on Add-side

AWG for wavelength mux/demux Fixed Grid

Colored Add/Drop

100% Add/Drop of up to 96 channels 2x100 GHz AWGs on

add side for lost cost

Fixed-grid OCM

Can make colorless by replacing AWG with High-Port Count WSS

Classic (B&S) ROADMO

CM

44 ch AWG88 ch AWG44 ch AWG

1x9

WSS

8x8 Span Crossconnect

8x8 Span Crossconnect

1x8

splitt

er

88 ADD 88 DROP


20x1 WSS1X20 WSS 20x1 WSS1X20 WSS20x1 WSS1X20 WSS

8x1 WSS

8x1 WSS

Passive splitter

Deg

ree

8

Deg

ree

1

Core switch

Add/Drop D1’ D8’

8x1 WSS

Degree 2

D2’

Up to 8 directions(only 3 shown)

20 add ports

20 drop ports

20 add ports

20 drop ports

20 add ports

20 drop ports

Multi-degree, Colorless and Directional Broadcast and Select Architecture

Interconnects multiple “degrees” or “directions”WSS (tunable mux/demux) used for add/drop => “Colorless”Add/drop ports tied to a particular direction => “Directional”


Route and Select ROADM

High isolation and OSNR performance, Flexgrid WSS and High Resolution Flexgrid OCMHigher # of ports for degrees and CD/CDC add/drop scalabilityFiltered ports for lower power OA and Noise managementLeverage coherent Rx self-filtering and low-cost splitter mux/demuxLower cost per port

DROP ADD

Dual 1X9or Dual1X20

Two WSS = 1

HRes –Flexgrid OCM


20x1 WSS

20x1 WSS

Deg

ree

8

Deg

ree

1


20x1 WSS

Degree 2

Core switch

Add/Drop

1x20 WSS

1x20 WSS

13 add ports

13 drop ports

13 add ports

13 drop ports

13 add ports

13 drop ports

1x20 WSS

Multi-degree, Colorless and Directional Route and Select Architecture

Tunable mux/demux WSS combined with core routing WSS“Broadcast and Select” -> “Route and select”


Multi-degree, Colorless, Directionless and Contentionless Architecture using Dual WSS

M×N WSXC: Multi-input Multi-output Wavelength Selective Switch MC-SW: MultiCast Switch

8x13WSXC

orMC-SW

8x13WSXC

orMC-SW

20x1 WS

Or 1X9 WSSS

20x1 WSS

or 1X9 WSS

Deg

ree

8

Deg

ree

1

20x1 WSS

or 9X1 WSSS

Degree 2

Core switch

Add/Drop

1x20 WSS

0r 1X9 WSSS

1x20 WSS

1x20 WS

or 1X9 WSS

8x12WSXC

orMC-SW

8x13WSXC

orMC-SW

8x13WSXC

orMC-SW

8x13WSXC

orMC-SW


12 add ports 12 drop ports 12 add ports 12 drop ports

8x13 is only an example.

It can scale to other values.

Main advantage is that it is a pay

as you grow architecture


Channel ADD/DROP Options

Direct WSS Port Drop/Add Limited number of WSS ports May limit amount of degree connections Direct Detect and Coherent

Mux/DeMux Colored versus Colorless Direct Detect

WSS/Splitter Coherent May have high loss (dependent on size of splitter)

Multicast Switch Colorless/Directionless/Contentionless High Loss Requires amplifier arrays

MXN WSS-High Port Count WSS Colorless/Directionless Coherent or Direct Detect

WSS

??????

WSS

??????


One Dual MxN WSSNo optical amplifier

WSS Loss~7dBScales to 96+ channelsFlexgrid~50% size & cost reductionSingle Slot with low profile Dual

aSplitter aCoupler

1x8 WSS 1x8 SS

aSplitter aCoupler

8x13 WSS

aSplitter aCoupler aSplitter aCoupler

Four 1xN WSS’sTwo optical amplifiersScales to 96+ channelsWSS Loss~14dB

Prior CD Architecture Approach Dual MxN WSS CD Architecture

8X1 WSS 8X1 WSS

1X13 WSS 13X1 WSS

Why MXN WSS?

8X13 WSS 13X8 WSSAmplifiers


40x1 WSS

40x1 WSS

Deg

ree

8

Deg

ree

1


40x1 WSS

Degree 2

Core switch

Add/Drop

1x40 WSS

1x40 WSS

32 add ports

32 drop ports

32 add ports

32 drop ports

32 add ports

32 drop ports

1x40 WSS

Emerging Future Application:Higher Port Count WSS Node

Improving the add/drop port ratio with higher WSS port count-lower cost


Emerging Application:Intra-node Connection Verification

ADD Dual MXN WSS

or MCS

Dual MXN WSS or MCS

Dual 2X1X9 or Dual 2X1X20 WSS allows for additional input port that offers loopback path for connection verification


Summary

Next Generation WSS and Architectures provide a capability to upgrade and future proof service provider networks and address emerging inter-building/remote site data center applications.

Higher Bandwidth-flexibility to transport 10G-400G+SDN/NFV- On Demand ability remotely reconfigure and restore networksColorless Directionless/Contentionless based upon cost and network requirements

Although there are many technology options, the MXN WSS is the most cost effective colorless directionless solution

The introduction of LCoS based Dual and High Port Count WSS continue to drive the cost/port down to provide new Applications, Cost Savings, and Operational Efficiencies


Thank You

emerging trends and applications for cost effective roadms

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