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15 February 2011.
As the European project 100 Gigabit Ethernet Transport (100-GET) comes to a conclusion, equipment vendor ADVA Optical Networking has reported the successful field trial of a low-cost, low-latency 100Gbps modulation format for metro network applications.  The trial took place over the metro network of an unnamed, tier one European carrier.
ADVA is the co-ordinator of the subproject 100-GET-metro, which has been seeking a cost-effective 100Gbps solution suited to metro networks.  The project team decided not to adopt the DP-QPSK (dual-polarisation quadrature phase-shift keying) modulation format with coherent detection agreed upon by the Optical Internetworking Forum (OIF) for long-haul 100Gbps transmission; instead, they used off-the-shelf components to build a simplified solution based on DPSK-3ASK (differential phase-shift keying 3-amplitude-shift keying) modulation with differential detection.

“In the metro and data centre connectivity domain, users need low latency, a small footprint, low power consumption and aggressive price points,” said Christoph Glingener, chief technology officer at ADVA. “This trial was excellent proof that we can deliver against these requirements.”

ADVA plans to commercialise the technology.  “We believe there is a market for non-coherent 100G solutions that address enterprise, metro, and regional applications,” a spokesperson told Lightwave magazine. “We will bring a commercial offering to market using the lessons learned from this trial.”
By Pauline Rigby.