Abstract
This paper presents back-to-back and transmission performance comparisons
between single-polarization 120 Gbit/s RZ-DQP-ASK and RZ-D8PSK formats in
a single-wavelength system. In the back-to-back configuration, we determine
the OSNR requirements of the two formats and compare the results with those
obtained analytically and numerically. In the transmission experiments, we
examine signal constellations to quantify the significance of intra-channel
fiber nonlinearities and investigate the BER performance of the two formats
over different reaches (up to 480 km). The results show that the performance
of DQP-ASK is superior to D8PSK in back-to-back configuration but is inferior
over long distances.
© 2011 IEEE
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