Abstract
We investigate electronic pre-compensation for a 10.7-Gb/s system employing a
directly modulated laser (DML). Initially, the nonlinear distortion resulting from the
direct modulation of the laser is mitigated by pre-compensation based on reversal of the
large signal rate equations and the use of digital signal processing to generate an
appropriate modulating current. This concept is then utilized in a novel look-up table
optimization scheme for electronic dispersion pre-compensation. Simulation results show
pre-compensation of up to 350 km of single mode fiber at a required optical signal to
noise ratio <16 dB for a bit error rate of 10<sup>-3</sup>. It is shown that a 42.8
GSa/s digital to analog converter is sufficient for exploiting the full potential for
electronic pre-compensation using a DML.
© 2011 IEEE
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