Research On The Network Protection In Elastic Optical Network

With the increase of traffic demand, the traditional optical network architecture is notefficient for high-capacity transmission. Recently, the elastic optical network receivesmuch attention due to its flexibility in bandwidth allocation and efficiency of fiberspectrum utilization. On the other hand, network protection is important for an opticaltransport network. This paper focuses on the protection techniques for the elastic opticalnetwork.First, we evaluate the span restoration (SR) technique for the elastic optical networkunder three different spectrum conversion capabilities. We develop Integer LinearProgramming (ILP) optimization models for the SR-based elastic optical network designunder different spectrum conversion capabilities. Second, we compare the Shared BackupPath Protection (SBPP) technique and1+1path protection techniques for the elastic opticalnetwork. For each of the techniques, we further consider two cases, i.e., with or withouttunable transponders. Last, we compare the p-Cycle and ring-cover techniques, anddevelop corresponding ILP models for each of the techniques. Also, we apply theBandwidth Squeezed Restoration (BSR) technique to each of the above-mentionedprotection techniques. Our studies show that (1) the spectrum conversion capability cansignificantly improve spare capacity efficiency for an elastic optical network,(2) the SBPPtechnique is more efficient to require much less spare capacity than that of the traditional1+1path protection technique, and (3) the p-Cycle technique is more efficient in spectrumutilization to require much less spare capacity than the ring-cover technique.