Diego Roccato

On the filter narrowing issues in elastic optical networks

This paper describes the problematic filter narrowing effect in the context of next-generation elastic optical networks. First, three possible scenarios are introduced: the transition from an actual fixed-grid to a flexi-grid network, the generic full flexi-grid network, and a proposal for a filterless optical network. Next, we investigate different transmission techniques and evaluate the penalty introduced by the filtering effect when considering Nyquist wavelength division multiplexing, single side-band direct-detection orthogonal frequency division multiplexing, and symbol-rate variable dual polarization quadrature amplitude modulation. Also, different approaches to compensate for the filter narrowing effect are discussed. Results show that the specific needs per each scenario can be fulfilled by the aforementioned technologies and techniques or a combination of them, when balancing performance, network reach, and cost.

Photonic - Electronic platform for next generation optical transport network

The introduction of advanced optical modulation formats for coherent data transmission and multilevel signalling enlarges the transmission capacities but also requires more complex opto-electronic components. The need for cost efficient compact solutions is the main driver for photonic-electronic integration technologies. In the framework of the European Project GALACTICO a new mixed technology platform for advanced transceivers is being developed. The technology relies on the cost efficient Germanium-on-Silicon technology, and SiGe BiCMOS technology together with GaAs technology [1]. A selection of the best suited materials and solutions ready to deploy is made to provide the performance required for transmitter and receiver of next generation networks operated at capacities beyond Terabit/s.

Mixed technology platform for terabit optical Ethernet applications

The GALACTICO technology platform combines GaAs modulator technology, Silicon board and Germanium receiver technology with 130nm BiCMOS technology. The paper will review the present status of our work, providing an overview of all technological building blocks and system performance.