Abstract
We observe that the performance of wavelength- routed
(WR) networks often suffers from asymmetric traffic and network traffic patterns
differing from the original design plans. WR networks with a fixed number
of channels in a given transmission direction are inflexible. Therefore, we
propose reversible wavelength channels. Like a reversible lane in highway
systems, a reversible wavelength channel has the flexibility of its transmission
direction being configurable at the setup of a lightpath. So far reversible
wavelength channels have not been discussed in WR networks even though we
observe that most of the required technologies are already available. In this
paper, we discuss all the required technologies for implementing reversible
wavelength channels in WR networks. We demonstrate that reversible wavelength
channel can provide significant performance improvement for WR networks when
the traffic is asymmetric. Even if the traffic is symmetric, we also have
nontrivial performance improvement with reversible wavelength channels, i.e.,
the blocking performance of WR networks with reversible wavelength channels
will be similar to that of normal WR networks with doubling the number of
fibers per link. Different implementation approaches for reversible wavelength
channels are discussed. Among them, the performance of the reversible waveband
approach is discussed in detail.
© 2013 IEEE
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