Alcatel-Lucent 100 GbE manual Context, Innovation, Challenges

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