Olivier Jahreis - Nokia Siemens Networks - High Capacity DWDM Systems

1 © Nokia Siemens Networks Broadband World Forum, September 2011

Nokia Siemens Networks

High Capacity DWDM Systems for Converged Packet OpticalOliver JahreisHead of Product Management DWDM


Outline

Converged Optical Packet – Metro network architectures

Converged Optical Packet – Core network architectures

Product requirements

Converged switching and transmission

Flexibility on WDM layer

Control plane convergence

High capacity networking


High capacity backhauling for mobile networks

Access

RNC

BSC

Aggregation to SAE-GW

2G/3G/LTE

2G/3G/LTE

WDM transport for any

NGM, Ethernet or IP network

Application:

• Capacity expansion of any fibre based network

• Co-existence of legacy and packet transport networks

Pros & Cons:

+ unlimited capacity – WDM removes scalability constraints when moving to LTE

+ lowest latency through optical signal processing

Evolution:

• Operate TDM systems till end-of-life, then migrate to packet-only aggregation


High capacity backhauling for residential access

Access Aggregation

WDM transport for any

access type traffic

Application:

• Video applications cause strong bandwidth growth

• DSL and even more PON remove bottle necks in the access

Pros & Cons:

+ unlimited capacity – WDM removes bandwidth bottle necks caused by bandwidth hungry residential customers

Evolution:

• Convergence of access and aggregation with Next Generation Optical Access (NGOA)

Core

Optical

Network

DSL

PON NGOA

Access networks migrate

to optical (NGOA)


Outline









Application:

• Converged core for all traffic types

• Traffic aggregation, provisioning, and protection

Advantages:

+ unlimited capacity

+ Packet and TDM services on one platform

Evolution:

• Smooth transition to all-packet networks

MWR

MWR

Mobile Backhaul Converged Packet Optical Core Network

MMESAE-GW

eNB

BTS

MPLS-TP / IP-MPLS

Next Gen.Optical Access

Packet Optical Transport Network

Residential fixed Backhaul

Converged Core Packet Optical Network Architecture

Packet Centric Backhaul Network

Enterprise services

IP

Peering

Packet Optical Transport Network: converged packet and TDM services integrated with WDM optical devices

Leased line services


Outline









Converged switching and transmission – P-OTS

P-OTS applications

• aggregation and grooming (ODU-x)

• end-to-end multi-service provisioning

• Restoration with GMPLS

• Multi-Domain networks (TCM, E-NNI)

The P-OTS switch feeds Metro traffic efficiently into core DWDM

P-OTS - best suited

• Transition from TDM to Ethernet (service-agnostic switch)

• high scalability (multi Terabit)

• Cost efficient bypass of routers (OTN vs IP Router cost-per-bit)

Access Metro Core

Services

Voice

UMTS

HSPA

High -Speed

Internet

IP TV

Video on

Demand

Services

IP TV

Video on

Demand

MSPP

CET

P-OTS

OTN

DWDM

…and restoration,

router bypass

ETH

Efficiency:

Capacity, and Filling

the lambdas…ETH

TDM

OTN

ETH

TDM

OTN

High Speed

Internet

Voice

UMTS,

HSPA, LTE

Leased Lines

Virtual Private

Networks


Outline









Flexible WDM layer with ROADM technology

• Transponder can be remotely tuned to any wavelength

• However transponder can only carry traffic in one predetermined direction

• Transponder can be remotely tuned to any wavelength and any direction

• However only one wavelength per add/drop tree can be used at the time e.g. wavelength blocking (wavelength contention)

• Transponder can be remotely tuned to any wavelength and any direction

• Up to N wavelengths can be repeated per add/drop tree eliminating the wavelength contention

Degree

#4

Degree

#2

Degree

#1

Degree

#5

Degree

#3

add/drop add/drop add/drop add/dropadd/drop

Transp.

Bank

Transp.

Bank

Transp.

Bank

Transp.

Bank

Transp.

Bank

Degree

#4

Degree

#2

Degree

#1

Degree

#5

Degree

#3


Transp.

Bank

Transp.

Bank

Transp.

Bank

Transp.

Bank

Transp.

Bank

Wavelengthcontention

Colorless + Directionless + Contentionless

Degree

#4

Degree

#2

Degree

#1

Degree

#5

Degree

#3


Transp.

Bank

Transp.

Bank

Transp.

Bank

Transp.

Bank

Transp.

Bank


Power transients – a challenge for transparent opticalnetworks

Optical power transients

• impact surviving channels if other channels fail due to fiber or equipment outages

• can propagate and increase along link

Issues, if transients are not controlled properly:Best case: Short error bursts (may impact protection paths if working fails).

Typical impact: Outages while power control converges (may be minutes).

Worst case: Permanent instability of power levels in network.

Example: fiber cut or re-routing by control plane

Multiple channels fail or are switched

Transient builds up


Transient proof WDM system design

Comprehensive set of measures:

• fast convergence of amplifier control

• End-to-end path control of channel power levels

• High transient tolerance of line cards

• Optional: control of total optical power per band

Network level control of optical power levels

0 5 10 15 20

time [ms]

Pow

er

excurs

ion

Minimized power excursions

with transient optimized

amplifiers

Standard

amplifier designStandard amplifier design

Minimized power excursions with transient optimized amplifiers


Outline









Superior coherent 40G and 100G technology

- 40%

Performance for Upgrade 40G100G

1500kmreachfor100G

2500km reachfor40G

Non-coherent WDM NSN’s coherent WDM

2500kmreachfor40G

2500kmreachfor100G

PMD tolerance (DGD)

10ps

100ps

Coherent40G/100G

Reference 10G

45ps

non-coherent40G/100G

New

old

fib

er

• mature, high volume and cost optimized 40G available since several years

• 100G becoming available in 2011, with fast cost competiveness (cost/bit) against 40G to be expected

• Coherent technology offers several advantages

• Superior reach performance

• Highest PMD tolerance

• Simple, dispersion compensation free installation

Only coherent 40G/100G technology secures the upgrade to 100G, and makes full use of the existing fiber base


Outline









GMPLS value proposition

Control Plane

Management Plane Mgmt Plane

Control Plane Control Plane

PCE

TED

PCE

TED

PCE

TED

DomainDomain Domain

Layer1

Layer2

Layer3

Point & click provisioning, signaling over control plane

Provisioningover multiple layers, bandwidth on demand

Automatic restorationover multiple layers and domains


Summary

• WDM removes capacity bottle-necks in mobile and fixed backhauling networks

• WDM has lowest latency, needed for LTE backhauling

• For core network, converged packet and OTN switches use WDM technology for unlimited capacity: P-OTS

• WDM networks can provide a very high degree of freedom using colorless, directionless, and contentionless ROADM technology

• Moving from 10G to 40G, 100G and beyond per wavelength decouples cost from bandwidth for future capacity growth

• Meshed WDM networks need careful transient control for reliable operation

• GMPLS control plane is used for efficient multi-layer service provisioning and restoration


Thank you for your attention

Oliver Jahreis

Mobile: +491728962745

Email: [email protected]

mailto:[email protected]

Olivier Jahreis - Nokia Siemens Networks - High Capacity DWDM Systems

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