Abstract
In this paper, we propose a simplified approach to optical signal predistortion
based on adaptive pulse shaping through asymmetrical control of a Mach--Zehnder
modulator above its switching voltage. The scheme allows natural tailoring
of transmitted pulses by optimizing the received pulse. We demonstrate enhancement
of the power tolerance in nonrepeated systems and improved OSNR/BER performance
and dispersion tolerance in ultra-long-haul fiber systems operating at 10
Gb/s and 20Gb/s channel rates. The improved performance
is demonstrated through simulations and experiment.
© 2009 IEEE
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