In large dynamic networks it is extremely difficult to maintain accurate routing information on all network nodes. The
existing studies have illustrated the impact of imprecise state information on the performance of dynamic routing and
wavelength assignment (RWA) algorithms. An algorithm called Bypass Based Optical Routing (BBOR) proposed by
Xavier Masip-Bruin et al can reduce the effects of having inaccurate routing information in networks operating under the
wavelength-continuity constraint. Then they extended the BBOR mechanism (for convenience it's called EBBOR
mechanism below) to be applied to the networks with sparse and limited wavelength conversion. But it only considers
the characteristic of wavelength conversion in the step of computing the bypass-paths so that its performance may
decline with increasing the degree of wavelength translation (this concept will be explained in the section of introduction
again). We will demonstrate the issue through theoretical analysis and introduce a novel algorithm which modifies both
the lightpath selection and the bypass-paths computation in comparison to EBBOR algorithm. Simulations show that the
Modified EBBOR (MEBBOR) algorithm improves the blocking performance significantly in optical networks with
Conversion Capability.
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