Abstract
The influence of the channel number on the optimal dispersion map (ODM)
due to cross-phase modulation (XPM) in wavelength division multiplexed links
is assessed using an analytical method. The analytical method is validated
by comparison with numerical simulation using two different methods: the pump-probe
method and a realistic method in which all channels are digitally modulated
carriers. It is shown that there are usually, at least, two local ODMs due
to XPM: one characterized by negative residual dispersion per span (RDPS)
and another characterized by positive RDPS. These two local ODMs due to XPM
lead to similar XPM-induced degradation. However, the local ODM with negative
RDPS shows always much higher tolerance to the dispersion map (DM) variation.
Furthermore, as the ODM due to the combined effect of self-phase modulation
and group-velocity dispersion is characterized by negative RDPS when reduced
and moderate power levels are used, the use of the local ODM due to XPM with
negative RDPS is recommended. This local ODM due to XPM remains approximately
the same as long as, at least, 8 channels are transmitted when 100 or 50 GHz
channel spacings are used and 12 channels are transmitted when 25 GHz channel
spacing is used. However, the high XPM tolerance to the DM variation for 25
GHz channel spacing leads to the conclusion that the ODM for 8 channels is
the recommended DM in case of an arbitrary number of channels, independently
of the channel spacing. These outcomes are independent of the power level,
number and length of spans and transmission fiber type.
© 2008 IEEE
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