Abstract
We consider the problem of planning a mixed line rate (MLR) wavelength
division multiplexing (WDM) transport optical network. In such networks,
different modulation formats are usually employed to support transmission at
different line rates. Previously proposed planning algorithms have used a
transmission reach bound for each modulation format/line rate, mainly driven
by single line rate systems. However, transmission experiments in MLR
networks have shown that physical layer interference phenomena are more
severe among transmissions that utilize different modulation formats. Thus,
the transmission reach of a connection with a specific modulation
format/line rate depends also on the other connections that copropagate with
it in the network. To plan an MLR WDM network, we present routing and
wavelength assignment algorithms that adapt the transmission reach of each
connection according to the use of the modulation formats/line rates in the
network. The proposed algorithms are able to plan the network so as to
alleviate cross-rate interference effects, enabling the establishment of
connections of acceptable quality over paths that would otherwise be
prohibited.
© 2011 IEEE
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