Alcatel-Lucent manual Context, Innovation, Challenges, Gigabit Ethernet 100 GbE

Models: 100 GbE

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100 Gigabit Ethernet (100 GbE)

100 Gigabit Ethernet (100 GbE)

Advanced Serial 100Gb/s Transmission Technology for Next Generation Optical Transport Networks

Context

Modern telecommunication networks need to be built with enormous traffic growth in mind. For example, today some internet exchange nodes have annual growth rates of more than 200% due to dramatic increases in users coupled with the needs of enriched data and broadband video services.

Accommodation of the global explosion in traffic (Figure 1) can only be assured by implementation of the most advanced high capacity optical metro/core transport network technologies. Soon networks based on next generation 40/100 Gigabit Ethernet (GbE) transport technologies will predominate. They will be based on standards currently under preparation by several standards organisations (e.g. IEEE, ITU-T).

DAT

 

 

 

 

A

THE

 

 

 

RAT

 

 

 

100Gb/s

ETHERNET

 

100GbE

EVOLUTION

 

 

 

40GbE

 

10Gb/s

ROADMAP

 

 

 

 

10GbE

 

 

 

 

 

1Gb/s

 

1GbE

 

 

 

 

 

 

100Mb/s

100MbE

 

40/100GbE will be

 

 

 

 

 

dominant transport

10Mb/s

10MbE

 

technology in next

 

generation optical

 

 

 

 

 

metro/core networks

 

1990

2000

2010

YEAR

Figure 1: Technology roadmap of optical transport networks. 40/100GbE will be dominant technology within the next decade.

Alcatel-Lucent’s concepts and real-time trials demonstrate 100Gbe’s graceful introduction and evolution to meet operators’ future needs.

polarization mode dispersion (PMD), must be compensated or mitigated efficiently.

Spectral efficiency must increase, enabling 100Gb/s transmissions over exsiting 10/40G DWDM systems (50/100GHz channel spacing).

Complex integrated circuits for digital signal processing (DSP) and new very high-speed components have to be developed using state-of-the-art electronics and photonics.

Innovation

Alcatel-Lucent has developed 100 Gbe concepts, shown prototypes and done field trials demonstrating its expertise in addressing future requirements.

Dispersion tolerant serial Nx100Gb/s DWDM transmission with high spectral efficiency

Figure 2 is a schematic of how high capacity Nx100Gb/s optical transmission is feasible over long- haul fiber links without dispersion compensation units (DCU) using conventional 10Gb/s DWDM platforms with narrow channel spacing (50GHz) corresponding to a spectral efficiency of 2bit/s/Hz.

2x28Gbit/s

Nx112Gbit/s

Fiber (dispersion, PMD)

 

 

wavelengths

QPSK

Tunable

Switch

 

 

 

 

 

 

 

 

 

100G

 

A.O.

 

 

Coherent

 

 

 

 

RX

M

QPSK

filter

 

 

 

 

 

 

 

 

 

2x28Gbit/s

SSMF

SSMF

 

 

 

Polarization Division Multiplexed

A.O.

 

 

Quadrature Phase Shift Keying

100km

 

 

Transmitter

 

 

 

 

x3

SSMF

SSMF

 

1

 

 

 

WSS

 

 

 

3 Optium

 

 

Figure 2: Nx100Gb/s Coherent PDM-QPSK DWDM transmission over 1200km laboratory fibre link.

Challenges

To get from here to there, several challenges associated with development and operation of ultra- high speed components and systems for serial 100 Gbit/s optical transmission must be overcome:

Stronger transmission signal impairments associated with the upgrade of data rates, due to chromatic dispersion (CD) and

Verizon 100G field trial with live traffic

Alcatel-Lucent, in a real-time field trial with Verizon (Figure 3), proved a 100Gb/s channel carrying a HDTV video signal can transmit parallel to existing live traffic 10Gb/s DWDM channels.

Alcatel-Lucent Innovation Days – December 2008

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Alcatel-Lucent manual Context, Innovation, Challenges, Gigabit Ethernet 100 GbE