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Alcatel-Lucent Innovation Days – December 2008
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).
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.
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
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.
Figure 2: Nx100Gb/s Coherent PDM-QPSK DWDM transmission over
1200km laboratory fibre link.
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.
10Mb/s
10Gb/s
1Gb/s
100Mb/s
100Gb/s
THE
ETHERNET
EVOLUTION
ROADMAP
(LAN/WAN)
100GbE
10GbE
1GbE
100MbE
10MbE
40GbE
DAT
A
RAT
2000
2010
1990
YEAR
40/100GbE will be
dominant transport
technology in next
generation optical
metro/core networks
A.O.
SSMF
Tunable
filter
x3
A.O.
100km
SSMF
SSMF
SSMF
100G
Coherent
RX
WSS
Optium
1
3
2x28Gbit/s
M wavelengths
QPSK
QPSK
2x28Gbit/s
Nx112Gbit/s
Switch
Fiber(dispersion, PMD)
A.O.
SSMF
Tunable
filter
x3
A.O.
100km
SSMF
SSMF
SSMF
100G
Coherent
RX
WSS
Optium
1
3
2x28Gbit/s
M wavelengths
QPSK
QPSK
2x28Gbit/s
Nx112Gbit/s
Switch
Fiber(dispersion, PMD)
Polarization Division Multiplexed
Quadrature Phase Shift Keying
Transmitter
100 Gigabit Ethernet (100 GbE)
Advanced Serial 100Gb/s Transmission Technology for Next Generation
Optical Transport Networks