Abstract
Time-domain wavelength interleaved network (TWIN) is an elegant and
cost-effective all-optical network designed by a group of researchers in Bell
Labs. It emulates fast optical switching via fast tunable lasers at the network
edge, so it does not need optical switching and buffering in the network core.
TWIN can be upgraded to provide larger capacity by using more receivers at
the nodes, where capacity is the aggregate data rate supported by the network.
In this paper, we focus on making this upgrade resource-effective. Specifically,
we exploit and optimize wavelength reuse so that the resulting network, called high-capacity TWIN (HC-TWIN), can better
utilize its available resources to provide larger capacity while retaining
the appealing advantages of TWIN. We formulate the problem of optimizing HC-TWIN,
prove its NP-hardness, and design an efficient three-stage algorithm to solve
it. Simulation results demonstrate that 1) HC-TWIN can provide larger capacity
by realizing larger degree of wavelength reuse and 2) the three-stage algorithm
can find optimal or close-to-optimal solutions.
© 2009 IEEE
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