photonic integration: a key enabler for reconfigurable digital optical networks serge melle vp,...

Photonic Integration: A Key Enabler for Reconfigurable Digital Optical Networks

Serge MelleVP, Technical Marketing Infinera

[email protected]

Infinera Confidential and Proprietary | 2

ROADM Benefits

Any wavelength at any node Simplify engineering and deployment compared to

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…


Wavelength Blocking in ROADM Networks

32-40 WDM

Allocate bandwidth on ROADM ring using available ’s Extending ROADM consumes ’s end-end across network… Blocking consumes extra ’s or requires OEO for conversion… ..or creates stranded bandwidth and faster capacity exhaust This does not scale with….

Protection; Hundreds of demands; Larger networks; Nodal connectivity


Sub-Wavelength Traffic in ROADM Networks

Typically many sub- 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

New A-Z demand

Option 1:• New end-end and

muxponders • Inefficient wavelength fill• Stranded capacity & faster

capacity exhaustOption 2:• Use existing ’s and muxponders• Added cost from extra interfaces• Manual inter-connects at back-back sites

require truck rolls and extra OpEx

1G 1G2.5G 2.5G

4 x 2.5G

8 x 1G


Lets Step Back: Benefits of Electronics in Optical Networks

Reach Improvement- 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 €

Dispersion Compensation- 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 €

PM and Operations- 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

Reconfigurable Switching- 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 €


Relative Costs of OEO – The “O” vs. the “E”

High cost of OEO conversion compared to the cost for manipulating the data

Implementing feature-rich network & service functionality incurs a cost premium

Silicon cost is not the problem…

…it is the conversion cost from Optical to Electronic

0

0.2

0.4

0.6

0.8

1

1.2

1.4

DWDM Laser

10G Modulator + Driver

10G Receiver + TIA50GHz ROADM portVT-1.5 Switch (10G)STS-1 Switch (160G)ODU-1 Switch (400G)

Rel

ativ

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osts

per

10G

Accessing the Data Manipulating the Data


100 Gb/s Transmit

100 Gb/s Receive

Why are OEO’s Expensive? Discrete Optics


100 Gb/s Transmit

100 Gb/s Receive

100Gb/s Transmit

100Gb/s Receive

Infinera’s Photonic Integrated Circuit Innovation

5mm

DIRECT BENEFITS: 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


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 …

Digital ElectronicsDigital Electronics& Software& Software

Signal regenerationSignal regenerationError correctionError correctionPerformance monitoringPerformance monitoringSub-Sub-add/dropadd/dropSub-Sub- Grooming & switching Grooming & switching Multi-Service MultiplexingMulti-Service MultiplexingProtectionProtection

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optical (analog) electrical (digital) optical (analog)


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-based add/drop

End-end GMPLS control plane Broadly deployed since 2004


Reconfigurable “Digital” Add/Drop

Switched WDM with sub- 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 WDMN x 100G WDM

N x 100G WDM

N x 100G WDM


Digital ROADM Service Provisioning & Engineering

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

DigitalNode

DigitalNode

DigitalNode

DigitalNode

DigitalNode

A – Z ServiceDemand

“4R” OEO-based management

Optical link management isolated between nodes

Digital Link


GMPLS-Enabled Networking at Every Node

GMPLS restoration capability in the transport layer with sub- circuit granularity

GMPLS-enabled end-end auto- provisioning between all nodes

Fiber Cut

GMPLS auto- discovery of circuit & physical topology of network & services

UNI signaling for IP-optical inter-networking

UNI


Architecture Impacts of Digital ROADMs

Unconstrained reconfigurability at every node

Sub- 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- protection & restoration

End-end GMPLS control plane enables service automation

Extensive digital PMs and diagnostics

Robust digital protection


100 Gb/s Transmit

100 Gb/s Receive

Integration: Heart of a New Strategy

Thank You

photonic integration: a key enabler for reconfigurable digital optical networks serge melle vp,...

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