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Algorithms and simulation tools to model Signal Propagation on Interconnects |
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Our Collegues, Vittorio Ricchiuti, chairman of 'Packaging and Power Intergrity' session, and Claudio Crognale, have partecipated at the 13th IEEE Workshop on Signal Propagation on Interconnects, in Strasbourg.
Vittorio Ricchiuti disclosed an algorithm for modeling differential vias connected to differential traces, so to evaluate the resonance frequency due to the stubs connected to the vias
The modern telecommunication equipments consist of boards connected by thick backplanes where differential traces on different layers transmit high speed digital signals.
These signals switch from different layers by means of plated through holes that, when not used, are stubs introducing dips on the insertion losses of the used traces.
The simplified model for evaluating the resonance frequency due to the stubs of a differential via has been proposed.
A test board has been laid out and measurements and simulations have been performed to validate the model.
Claudio Crognale presented a paper investigating the problematic of preserving the signal integrity in a board equipped with Semiconductor Optical Amplifiers (SOAs), optically interconnected to perform optical signal demultiplexing at several hundreds of Gb/s.
First, the extreme features of the nonlinear optical gain saturation dynamics in SOAs inputted with dense femtosecond optical pulses signals have been derived by means of a proper theoretical model, suitable for calculating – in a self-consistent way - the quasi-Fermi levels and the carriers temperatures from the instantaneous values of the carrier density and the energy densities in both valence and conduction bands.
Then, the results obtained have been used to investigate the potential performances of an interferometric SOA-based pump-probe scheme working as an all-optical ultrafast demultiplexing structure.
Simulations have revealed how, with a proper management of the SOAs nonlinear optical gain dynamics, this architecture could extract any 100Gb/s channel from a 500Gb/s pattern, with a high value of its extinction ratio, a negligible amount of optical losses, and no degradation due to the SOA optical gain pattern dependence.
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