  High-bandwidth signals are needed in many applications like radar, sensing,
measurement and communications. Especially in optical networks, the sampling
rate and analog bandwidth of digital-to-analog converters (DACs) is a
bottleneck for further increasing data rates. To circumvent the sampling rate
and bandwidth problem of electronic DACs, we demonstrate the generation of
wide-band signals with low-bandwidth electronics. This generation is based on
orthogonal sampling with sinc-pulse sequences in N parallel branches. The
method not only reduces the sampling rate and bandwidth, at the same time the
effective number of bits (ENOB) is improved, dramatically reducing the
requirements on the electronic signal processing. In proof of concept
experiments the generation of analog signals, as well as Nyquist shaped and
normal data will be shown. In simulations we investigate the performance of 60
GHz data generation by 20 and 12 GHz electronics. The method can easily be
integrated together with already existing electronic DAC designs and would be
of great interest for all high-bandwidth applications.
