Abstract
Among all proposed structures for optical networks, the optical packet
switching (OPS) scheme, due to its practical implementation of IPs in an optical
configuration and the consequent advantages, is a prizeworthy candidate for
being employed in metropolitan area network and local area network communication
levels. One of the few problems frequently met using the OPS structure in
the fiber-optics realm is the lack of optical buffers, thus deteriorating
the system's flexibility and quality of service. For example, optical label
switching networks that have been developed recently based on the generalized
multiprotocol label switching protocol, profoundly suffer from this setback
which is considered as a great hurdle in their evolution. In this paper, we
first introduce the input and output buffer switching models while deducing
their blocking probability formulations. Then, by utilizing codes in the OPS
structure, we closely examine the potential of code and/or wavelength switching
in packet switching networks and also determine their blocking probability.
Due to close similarities between different scenarios, we present the prospect
of virtual optical buffers using
codes, which have close performance to input and output buffers in sight of
block probability. The most significant distinction in using virtual
buffers is the fact that due to their substantial nature, they
happen to exhibit some error probability. However, on account of the advantageous
features of codes, the simulated and formulated error probability for both
coherent and noncoherent optical code division multiple access (OCDMA), such
as Spectrally phase encoded OCDMA and optical orthogonal codes, using virtual buffers, tends to be negligible.
Two main code and wavelength switching schemes are also brought to attention
in this work, the intelligent and random methods. These scenarios demonstrate
an even greater behavioral performance to that of the mere code switching
scenario, leading into a more reliable adaptation of virtual
buffers. In addition, simulations results happen to provide clear
verifications to our analytical approach.
© 2012 IEEE
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