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Emerging Trends and Applications for Cost Effective ROADMs
- 1. © Finisar Corporation Confidential 1
Ken Garrett
Emerging Trends and Applications for Cost
Effective ROADMs
- 2. © Finisar Corporation Confidential 2
Increasing Network Agility ROADM Network Applications
ROADM implementation
• Wireline
• MSO
Data Centers
Wireless
Backhaul
• Utilities
- 3. © Finisar Corporation Confidential 3
WSS/ROADM Demand Continues to Grow
Higher Port Count WSS fastest growing area in the next 3 years
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
0
10
20
30
40
50
60
70
CY05 CY06 CY07 CY08 CY09 CY10 CY11 CY12 CY13 CY14 CY15 CY16 CY17 CY18 CY19
PercentofWSSComponentUnits
Units(Thousands)
WSS (1x4 or less) WSS (1x5 to 1x9) WSS (1x10 or larger) 1x5 or larger + 1x10 or larger (%)
Source: Infonetics Research May 2015
- 4. © Finisar Corporation Confidential 4
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
- 5. © Finisar Corporation Confidential 5
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
- 6. © Finisar Corporation Confidential 6
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
- 7. © Finisar Corporation Confidential 7
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
- 8. © Finisar Corporation Confidential 8
RECONFIGURABLE CDC ROADM Wavelength Routing
Apollo
OPT9624
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
• 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
- 9. © Finisar Corporation Confidential 9
Data Center Interconnect-
Example of an agile SDN –NFV type network application
DC Site1
DC Site2
DC1/DC2 Interconnect provisioned path
Content consumption provisioned path
Alternate path for a temporary period
Control
Content
Consumer
(e.g. University)
Connect DC1 to DC2 in
highest priority
Resume to “normal”
configuration
“OK”
Data Center
Manager
- 10. © Finisar Corporation Confidential 10
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) ROADMOCM
44 ch AWG
88 ch AWG44 ch AWG
1x9WSS
8x8 Span
Crossconnect
8x8 Span
Crossconnect
1x8splitter
88 ADD 88 DROP
- 11. © Finisar Corporation Confidential 11
20x1 WSS 1X20 WSS 20x1 WSS 1X20 WSS20x1 WSS 1X20 WSS
8x1 WSS
8x1 WSS
Passive
splitter
Degree8
Degree1
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”
- 12. © Finisar Corporation Confidential 12
Route and Select ROADM
High isolation and OSNR performance,
Flexgrid WSS and High Resolution Flexgrid OCM
Higher # of ports for degrees and CD/CDC add/drop scalability
Filtered ports for lower power OA and Noise management
Leverage coherent Rx self-filtering and low-cost splitter mux/demux
Lower cost per port
DROP ADD
Dual 1X9
or Dual1X20
Two WSS = 1
HRes –Flexgrid
OCM
- 13. © Finisar Corporation Confidential 13
20x1 WSS
20x1 WSS
Degree8
Degree1
Up to 8 directions
(only 3 shown)
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”
- 14. © Finisar Corporation Confidential 14
Multi-degree, Colorless, Directionless and Contentionless
Architecture using Dual WSS
M×N WSXC: Multi-input Multi-output Wavelength Selective Switch
MC-SW: MultiCast Switch
8x13
WSXC
or
MC-SW
8x13
WSXC
or
MC-SW
20x1 WS
Or 1X9 WSSS
20x1 WSS
or 1X9 WSS
Degree8
Degree1
20x1 WSS
or 9X1 WSSS
Degree 2
Core switch
Add/Drop
1x20 WSS
0r 1X9 WSSS
1x20 WSS
1x20 WS
or 1X9 WSS
8x12
WSXC
or
MC-SW
8x13
WSXC
or
MC-SW
8x13
WSXC
or
MC-SW
8x13
WSXC
or
MC-SW
Up to 8 directions
(only 3 shown)
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
- 15. © Finisar Corporation Confidential 15
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
??????
- 16. © Finisar Corporation Confidential 16
One Dual MxN WSS
No optical amplifier
WSS Loss~7dB
Scales to 96+ channels
Flexgrid
~50% size & cost reduction
Single Slot with low profile Dual
aSplitter aCoupler
1x8 WSS 1x8 SS
aSplitter aCoupler
8x13
WSS
aSplitter aCoupler aSplitter aCoupler
Four 1xN WSS’s
Two optical amplifiers
Scales to 96+ channels
WSS 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 WSS
Amplifiers
- 17. © Finisar Corporation Confidential 17
40x1 WSS
40x1 WSS
Degree8
Degree1
Up to 8 directions
(only 3 shown)
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
- 18. © Finisar Corporation Confidential 18
Emerging Application:
Intra-node Connection Verification
ADDDual 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
- 19. © Finisar Corporation Confidential 19
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 networks
Colorless 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