Abstract
We investigate the performance of sinc-shaped QPSK signal
pulses generated in the digital, electrical, and optical domains. To this
end an advanced transmitter with a digital pulse-shaper is compared to analog
transmitters relying on pulse-shaping with electrical and optical filters,
respectively. The signal quality is assessed within a single carrier setup
as well as within an ultra-densely spaced WDM arrangement comprising three
channels. An advanced receiver providing additional digital filtering with
an adaptive equalization algorithm to approximate an ideal brick-wall Nyquist
filter has been used for all schemes. It is found that at lower symbol rates,
where digital processing is still feasible, digital filters with a large number
of filter coefficients provide the best performance. However, transmitters
equipped with only electrical or optical pulse-shapers already outperform
transmitters sending plain unshaped NRZ signals, so that for higher symbol
rates analog electrical and optical techniques not only save costs, but are
the only adequate solution.
© 2013 IEEE
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