Abstract
It is shown that electronic pre-compensation effectively reduces the
degradation in system performance caused by narrow filtering that arises
from the cascading of optical filters in spectrally efficient, wavelength
division multiplexed systems. The pre-compensation is based on generating
the appropriate electrical drive signals for an optical modulator such that
the transmitted optical signal takes into consideration the subsequent
optical filtering. Three modulation formats (on-off keying,
differential-phase-shift keying and differential-quadrature-phase-shift
keying) and two types of optical modulators (dual-drive
Mach–Zehnder modulator and dual-parallel Mach–Zehnder
modulator) are considered.
© 2009 IEEE
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