Abstract
Dispersion in optical fiber
degrades the quality of signal in optical networks. Although the use of dispersion
compensating fiber (DCF) reduces the effects of dispersion, it is expensive
and has more propagation loss compared to step-index fiber (SIF). In this
paper, we propose a priority based dispersion-reduced wavelength assignment
(PDRWA) scheme to reduce overall dispersion in optical network. In this scheme,
the connection requests having a same source-destination (s-d) pair are groomed first to avoid intermediate
optical-electrical-optical (O/E/O) conversation and then these groomed connection
requests with longer lightpath are assigned the wavelengths having lesser
dispersion and the wavelengths having a higher dispersion are assigned to
the lightpaths with shorter distance. If the connection requests are assigned
to the wavelengths using such constraint on dispersion, the overall dispersion
in the network can be reduced to a great extent, which will in turn lead to
better performance of the network in terms of overall signal quality (Q-factor)
without increasing network setup cost. The performance analysis of the proposed
scheme using SIF is conducted with different channel speeds (10, 40 and 100
Gbps) in terms of total dispersion and compared the same with the use of DCF.
Furthermore, we have studied the overall Q-factor in the network with different
channel speeds and considering polarization mode dispersion (PMD) effect using
SIF and DCF.
© 2012 IEEE
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