Abstract
In this paper, we obtain an analytical formulation to describe the penalty of the main important
sources of impairment into the final performance in directly modulated/detected OOFDM systems. These equations aim to
give a comprehensive description of deliberate clipping process at the OFDM transmitter, laser direct modulation, the
impact of the channel impulse response length and the nonlinearity introduced by the laser, and the interplay between
laser chirp and chromatic dispersion. Jointly, the provided expressions allow us, firstly, to analyze and understand
the performance obtained in an OOFDM system in short-medium optical haul links, and, second, to optimize important
transceiver parameters such as the clipping level, length of the cyclic pre/postfix, and laser modulation index.
© 2013 IEEE
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