Detlef Stoll

All-optical-networking at 0.8 Tb/s using reconfigurable optical add/drop multiplexers

We report on the successful operation of a metropolitan DWDM network composed of static and reconfigurable optical add/drop multiplexers. The error-free transmission of 80 channels at 10-Gb/s line rate (0.8 Tb/s aggregate capacity) is demonstrated in a transparent fiber ring of 60-km circumference. The 50-GHz technology is enabled by an optical frequency interleaver, and single wavelength channels are routed dynamically by thermally tunable fiber gratings. This work experimentally demonstrates the concept for the German KOMNET Cityring field-trial, Berlin, Germany.

System impact of cascaded optical add/drop multiplexers based on tunable fiber Bragg gratings

The system impact of cascaded wavelength routing nodes is investigated for a transparent all-optical network. A combination of simulations and experimental measurements is used to evaluate dynamic optical add/drop multiplexers based on tunable fiber gratings.

The Berlin City Ring—a Testbed for Future Metropolitan Networks

Dense wavelength division multiplexing (DWDM) is the key technology for future data transport. It combines transmission of data rates up to several Tb/s [1] with an overall transparency to data format and bit rate. The expected huge bandwidth demand in the near future requires an adaptability of DWDM transmission technology to metropolitan networks. Therefore, dynamically configurable DWDM transmission technology for bit rates up to 10 Gb/s has been investigated in a field trial in Berlin. This field trial is part of the KomNet research project. It is the goal of this field trial to optimize DWDM systems to metropolitan network requirements. Several aspects are in this paper: (i) A network simulation tool is described which helps to enlighten the profitability of statically and dynamically configured network nodes. (ii) A newly developed technology to add and drop single-wavelength channels is explained. (iii) The scalability of the approach is demonstrated with an aggregate capacity of 0.8 Tb/s. The equipment has already been installed in the field and is ready for experiments.

Reconfigurable all-optical networking at terabit transmission rates

We report on a transparent metropolitan fiber-ring composed of reconfigurable OADMs. Wavelength channel routing by tunable fiber Bragg-gratings and optical switching matrices is investigated. The results demonstrate the feasibility of the high capacity WDM-ring within the KOMNET field-trial.