A3: Metrology of High-bandwidth Sampling Systems

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In the first phase of METERACOM we have successfully investigated the metrology of high-bandwidth sampling systems and of integrated devices for sampling. But, we have restricted ourselves to a baseband width of around 40 GHz. However, exponentially increasing data rates, especially in wireless systems, have led to the definition of peak data rates of 1 Tbps for next generation systems like 6G and beyond. Such high data rates not only need new carrier frequencies in the THz region of the spectrum. In order to relax the requirements on the spectral efficiencies of the electronic signal processing, they need higher baseband widths, too. Thus, in the second phase of METERACOM, we will investigate error sources of several methods for increasing the processible bandwidth of sampling systems by a parallelization of the incoming high-bandwidth signal into several low-bandwidth sub-signals in the time or frequency domain. These sub-signals can then be detected and further processed in parallel by low-bandwidth electronics. In this sub-project of METERACOM we will investigate the error sources of these parallelization systems, possibilities to mitigate them and (in strong collaboration with A1 and T) we will establish a traceable measurement chain to the representation of SI units for the assessment and mutual comparison of these systems. Additionally, in collaboration with B2 and C3, we will make experiments and develop simulation models for the practical investigation of one of the parallelization systems we have invented in the first phase of the project, which enables a separation into the sub-channels with very low error. Furthermore, we will develop algorithms for the simulation of sampling systems with best in class components, currently available in research for the evaluation of the experiments in B2 and the model of C3. We will mainly build on initial preliminary results achieved in the first phase of the project and by a collaboration with the University of Rennes we will have access to a laser system which makes the state of the art in spectral purity.