Sunday, March 22, 2009

ADVA Optical Networking Demonstrates Serial 100 Gbps Transmission

ADVA Optical Networking has developed a novel DPSK-3ASK (Differential Phase-Shift Keying, 3-level Amplitude-Shift Keying) modulation format for serial 100Gbps transmission over a single wavelength channel. Engineers at the company's labs in Meiningen, Germany, have successfully demonstrated for the first time this new modulation scheme, which utilizes available 40 Gbps components and facilitates operation on a standard ITU (International Telecommunication Union) channel grid.

ADVA noted that existing serial 100Gbps proposals such as DP-QPSK (Dual-Polarization Quadrature Phase Shift Keying) have been optimized for (ultra-) long haul transmission. Their complexity, cost and power consumption make them less suitable for metro applications. Given the substantial challenge of achieving reasonable link distances at 100Gbps due to chromatic dispersion and polarization mode dispersion, most industry work on short distances to date has centered on multi-fiber and multi-lambda approaches. The IEEE, ITU-T and OIF have all been working on 100 Gbps standards, with the focus currently placed on the two extremes of transmission distance.

ADVA said its DPSK-3ASK solution is complementary to existing 10- and 40 Gbps designs and fits in existing installed network architectures, making it easier to upgrade and operate. Its direct detection alleviates the need for power-consuming, high-speed digital signal processing as typically required for long-haul schemes. It is compatible with DWDM systems like the ADVA FSP 3000, and when coupled with optical amplification facilitates metro/regional transmission distances up to 600km.

This work by ADVA Optical Networking was partially funded by the German Ministry of Education and Research (BMBF) and is part of the CELTIC 100GET-METRO project. Get more information on ADVA Optical Networking's participation in this project.

"Current industry standardization efforts have left a gap between 40km and 600km, which leaves a sizeable portion of the market unaddressed. Our solution targets exactly that sweet spot," stated Dr. Christoph Glingener, chief technology officer (CTO) for ADVA Optical Networking. "In addition, this solution utilizes off-the-shelf componentry, which enables it to be implemented sooner and with minimal industry investment, lessening the burden on optical component companies in a difficult market environment."

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