Transcript Photonic Integration: A Key Enabler for Digital Optical

Photonic Integration: A Key Enabler for
Reconfigurable Digital Optical Networks
Serge Melle
VP, Technical Marketing
Infinera
[email protected]
ROADM Benefits
 Any wavelength at any node
 Simplify engineering and deployment compared to
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fixed OADM
Remote provisioning and reconfiguration
Eliminate truck rolls to intermediate sites
Reduce cost through OEO elimination – end-end
wavelength networking
The underlying premise: less electronics + more
optics = lower cost
But…
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Wavelength Blocking in ROADM Networks
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Allocate bandwidth on ROADM ring using available l’s
Extending ROADM consumes l’s end-end across network…
Blocking consumes extra l’s or requires OEO for l conversion…
..or creates stranded bandwidth and faster capacity exhaust
This does not scale with….
 Protection; Hundreds of demands; Larger networks; Nodal connectivity
32-40 l WDM
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Sub-Wavelength Traffic in ROADM Networks
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Typically many sub-l end-end demands: GbE or OC-48/STM-16
Use “Muxponders” to aggregate 8-10 x 1G or 4 x 2.5G per wavelength
Creates many point-point connections and complex planning
New demands either strand bandwidth, or consume extra wavelengths
Different muxponders for 1G and 2.5G compound complexity
Option 1:
• New end-end l and muxponders
• Inefficient wavelength fill
• Stranded capacity & faster
capacity exhaust
Option 2:
• Use existing l’s and muxponders
• Added cost from extra interfaces
• Manual inter-connects at back-back sites
require truck rolls and extra OpEx
8 x 1G
4 x 2.5G
1G
2.5G
2.5G
1G
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Lets Step Back:
Benefits of Electronics in Optical Networks
Reconfigurable Switching
Dispersion Compensation
- Wide choice of switching/grooming
granularity (VC-4, ODU-1, packet)
- Fundamental to managing and
grooming customer services
- Highest level of reconfigurability
- Cost per chip: 10’s to 100’s of €
- FFE and DFE can compensate
upwards of 1000ps/nm
- MLSE can correct upwards of
3000ps/nm dispersion
- Significant space savings vs. DCF
- Cost per device: 10’s of €
Reach Improvement
PM and Operations
- G.709 standard defines 6dB gain FEC
(Reed-Solomon)
- High-gain FEC provides optical gain of
8dB to 9dB
- Corrects BER of 10-3 to BER of 10-17
- Cost per chip: 10’s to 100’s of €
- OTH and SONET/SDH Overhead
- Extensive digital PM at all OEO nodes
- J0/B1, BIP-8
- FEC bit error rate monitoring
- Communication channels for OAM&P
- SONET/SDH DCC and OTH TCM
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Relative Costs of OEO – The “O” vs. the “E”
Accessing the Data
Manipulating the Data
 High cost of OEO
1.2
1
0.8
0.6
0.4
0.2
(4
00
G
)
)
conversion compared to
the cost for manipulating
the data
 Implementing featurerich network & service
functionality incurs a
cost premium
 Silicon cost is not the
problem…
…it is the conversion
cost from Optical to
Electronic
O
D
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(1
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RO
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+
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Re
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A
er
Dr
iv
10
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M
od
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or
+
10
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La
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0
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Relative Costs per 10G
1.4
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Why are OEO’s Expensive? Discrete Optics
100 Gb/s Transmit
100 Gb/s Receive
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Infinera’s Photonic Integrated Circuit Innovation
100 Gb/s Transmit
100Gb/s Transmit
100Gb/s Receive
5mm
 DIRECT BENEFITS:
100
Gb/s Receive
 Reduce
size, power, cost and improve reliability
 STRATEGIC BENEFITS:
 Low-cost OEO conversion re-enables digital networking
 Result: Lower CapEx, lower OpEx, more flexible
reconfigurable optical network
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Photonic Integration Enables a “Digital” ROADM
 Use (analog) photonics for what it does best: transmission
 Use (digital) electronics for everything else – more functionality / lower cost
 Consistent with other network elements: SONET/SDH, switches, routers …
Signal regeneration
Error correction
Performance monitoring
Sub-l add/drop
Sub-l Grooming & switching
Multi-Service Multiplexing
Protection
electrical (digital)
Integrated Photonics
Integrated Photonics
optical (analog)
Digital Electronics
& Software
optical (analog)
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Infinera DTN: First PIC-based Digital ROADM
 100G per line card
 Digital ROADM WDM system
 Distributed electronic OTU1 switch
fabric
 SONET/SDH, Wave and Ethernet
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based add/drop
End-end GMPLS control plane
Broadly deployed since 2004
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Reconfigurable “Digital” Add/Drop
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Switched WDM with sub-l grooming at all nodes
Removes wavelength blocking constraints – any point to any point
Maximizes WDM capacity on every link - no stranded bandwidth
“Switched WDM” eliminates back-to-back transponder connections
“Mix and match” of 1G, 2.5G, 10G and 40G services on any wavelength
Scales with network capacity, number of nodes, network size/distance
N x 100G WDM
N x 100G WDM
N x 100G WDM
N x 100G WDM
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Digital ROADM Service Provisioning & Engineering
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Full Digital OAM&P at each Digital Node
Optical link and impairments management isolated between nodes
Optical service layer independent of optical transmission layer
Eliminates all constraints on end-end service path
Enhance access to PM and OAM&P data at all nodes
Simplify network planning, system engineering and service turn-up
“4R” OEO-based
management
Digital
Node
Digital Link
Digital
Node
Optical link management
isolated between nodes
A – Z Service
Demand
Digital
Node
Digital
Node
Digital
Node
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GMPLS-Enabled Networking at Every Node
UNI signaling for IPoptical inter-networking
Fiber
Cut
GMPLS auto- discovery of
circuit & physical topology
of network & services
GMPLS restoration capability
in the transport layer with
sub-l circuit granularity
UNI
GMPLS-enabled endend auto- provisioning
between all nodes
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Architecture Impacts of Digital ROADMs
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Unconstrained reconfigurability at every node
Sub-l granularity for grooming, switching and add/drop
Consolidate DWDM transport & switching in core
Topology/distance-independent service activation
Support linear, ring and mesh topologies
Integrated sub-l protection & restoration
End-end GMPLS control plane enables service automation
Extensive digital PMs and diagnostics
Robust digital protection
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Integration: Heart of a New Strategy
100 Gb/s Transmit
100 Gb/s Receive
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Thank You