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In this paper, we consider a unidirectional ring network with limited reconfigurability and take up the problem of supporting all-to-all traffic - while minimizing the worst-case wavelength range of the reconfigurable optical add drop multiplexers (ROADMs). ROADMs can be limited in range (L-ROADMs) or have full range (F-ROADMs). The cost of such a network(More)
The cost of an optical network in wavelength division multiplexing (WDM) networks can be reduced using optical reconfigurable optical add/drop multiplexers (ROADMs), which allow traffic to pass through without the need for an expensive optical-electro-optical (O-E-O) conversion. Waveband switching (WBS) is another technique to reduce the network cost by(More)
An important factor that affects the cost of WDM networks is the number of wavelengths to be added/dropped by reconfigurable optical add drop multiplexers (ROADMs). Limiting the range of wavelengths that can be accessed at a node reduces costs. In this paper, we study wavelength assignment (WA) in WDM bi-directional ring networks with limited(More)
With increasing packet-based traffic in metro networks, fast reconfigurability is becoming a requirement for optical networks. Since manual reconfiguration could take weeks, carriers are upgrading their SONET/SDH infrastructures with reconfigurable optical add-drop multiplexers (ROADMs) and tunable optical filters. This paper looks at the issue of the(More)
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