Abstract
In this paper, the influence of tight optical filtering (TOF) on dispersion-managed
long-haul (LH) transmission performance of advanced signaling formats is analyzed
through extensive numerical simulation. The investigation is performed for
duobinary, carrier-suppressed-return-to-zero (CS-RZ), and duobinary CS-RZ
(DCS-RZ) signaling formats, which were suggested for LH ultradense wavelength
division multiplexing systems previously. The simultaneous variation of pre-,
inline, and postcompensation of dispersion amounts is performed to find out
the optimum dispersion map of each signaling format with and without TOF,
and their dispersion tolerances. The tolerance to fiber nonlinearity of each
signaling format is also analyzed. It is shown that the TOF affects differently
the LH transmission performance of the three signaling formats. The TOF reduces
the dispersion tolerances of the duobinary signaling format, but improves
the maximum $Q$-factor and tolerance to nonlinear
fiber effects due to the eye-opening improvement. It improves the tolerance
to inline dispersion and fiber nonlinearity of the CS-RZ signaling format,
but it reduces remarkably the eye opening leading to a significant $Q$-factor degradation. It improves also the maximum $Q$-factor and the total residual dispersion tolerance
of DCS-RZ format due to the reduction of the signal spectrum width, but it
worsens the tolerance to pre- and inline dispersion, and fiber nonlinearity.
© 2008 IEEE
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