Wavelength conversion and call connection probability in WDM networks

Frey, Michael; Ndousse, T.D.

doi:10.1109/26.957400

Cited by 19 publications

(4 citation statements)

References 12 publications

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“…Further, is the conversion efficiency of the SOA converter. The overall gain (G NWC ) of an optical crossconnect which is not equipped with wavelength converter is G NWC = G in G out L sw L mx L dm (2) It is also to be noted that the conversion efficiency of a SOA converter depends on the difference between the input and output frequencies [22,23]. This implies that the efficiency will vary depending on the input and output wavelengths of a converter.…”

Section: Fig 2 Types Of In-band Crosstalkmentioning

confidence: 97%

“…In such cases the probability for call blocking arises due to wavelength contention when two calls at the same wavelength are to be routed using the same network link. Wavelength conversion is a means to overcome this problem [2]. Wavelength converters relax the wavelength continuity constraint and help to admit more calls into the network.…”

Section: Introductionmentioning

confidence: 99%

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Wavelength conversion and in-band crosstalk in WDM optical networks

Saminandan

Meenakshi

2009

J Opt

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Wavelength-routed all-optical networks have emerged as a popular architectural solution for wide area networks and are being conceived for future broadband communications. Call connection probability in such networks depends on the number of WDM wavelengths employed and on the capability for wavelength conversion at network nodes. Equipping all the network nodes with wavelength conversion capability to reduce the blocking probability is not a cost effective solution due to the high cost of wavelength converters (WC). Hence, networks equipped with converters at only some of the nodes are more practical. However, these nodes should be identified optimally so that network blocking probability is minimized. In this paper, wavelength converters based on four wave mixing (FWM) in semiconductor optical amplifiers (SOAs) is considered. In WDM all-optical networks, in-band crosstalk is regarded as one of the major transmission impairments. In-band crosstalk usually arises when multiple signals at identical or adjacent wavelengths pass through an optical crossconnect node. In-band crosstalk leads to increased receiver BER. This paper considers in-band crosstalk arising in a network which is equipped with wavelength converters. For every dynamically arriving connection request, a route is determined using Dijikstra's algorithm and a free wavelength is determined using the random wavelength assignment. If no common free wavelength is available, connection is tried using wavelength converters, if available, on the given route. If wavelength assignment does not succeed, the call is blocked. If wavelength assignment succeeds, the BER at the destination node is computed before establishing the lightpath. If the estimated BER exceeds 10 -12 , the call is blocked. Otherwise, the call is admitted. The results reveal that wavelength converters are not useful in networks that already suffer from crosstalk conditions.

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Section: Fig 2 Types Of In-band Crosstalkmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Wavelength conversion and in-band crosstalk in WDM optical networks

Saminandan

Meenakshi

2009

J Opt

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“…With wavelength converters at each network node, a call can go through as long as any wavelength is free on each link of the route. Applying Frey's idea [14], we have considered the number of wavelength changes which is permitted over a multicast route that is restricted to calculate the call-connection probability in the WDM network. Figure 12 shows the call-connection probability versus the number of wavelengths per link in the NSFNET network.…”

Section: Tablementioning

confidence: 99%

Optimal Lightpath Routing in WDM Multicast Networks

Tseng¹

2005

IEICE Transactions on Communications

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In this paper, we propose a heuristic multicast routing algorithm, which minimizes the cost while satisfying both the wavelength required and hop length selection. The algorithm consists of two subproblems: the wavelength assignment & the routing path selection. For solving the wavelength assignment subproblem, an auxiliary graph is created where by the nodes and the links in the original network are transformed to the edges and the vertices, respectively, and the same availability wavelength of each edge is taken into a multicast group. Furthermore, for solving the routing path selection subproblem, the shortest-path routing strategy is adopted to choose transmission path between two multicast groups. Simulation results show that our algorithm performs much better than previously proposed algorithms with increasing call-connection probability by 28% and reducing the blocking probability by 52%.

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“…at a time when a call arrives (due to a property of the Poisson process) Tben Pli IP i 112"" P hlj is the probabi lity Ihat a given wavelength is available on all links over the pathfrom i 10 j. Hence the probability that a call successfully finds a lightpath from i 10 j gi yen by (2) We next consider the path from source node 8 to destination node d that includes converters at nodes c( 1), c(2) ... c(k). The set of these nodes is a subset of given con verter placement C in the entire network.…”

Section: Blocking Probabilitymentioning

confidence: 99%

Optimal Wavelength Converter Placement in Wavelength-Routed Optical Networks by Simulated Annealing

Saminadan

Meenakshi

2004

J Opt

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Wavelength.routed all·opticailletworks have emerged as a popular architectural solution for wide area networb and are being conceived for future broad·band communications. Call conneclioll probabilily in such networks depend on the nlunber ofWDM wavelengths employed and Oll the capability for wavelength conversioli al network nodes. Equipping all the nerwork lIodes with wavelength converters to reduce the blockillg probability is Ilot a cast effective solution dueto the high cost of wavelellglh converlers. Hellce olily same of the nodes are 10 be equipped with wavelellglh converters. The objective oflhis paper is 10 atJdress the optimal placement of wavelenglh converters among Ihe network nodes. Here "placement" refers to providülg a network llode wilh wavelellgth conversion capability. This paper lUes simulated annealülg 10 delenllille Ihe location oflhe converters ÜI order to achieve ",ini",ulII blockillg probability. It is observed that this method significalllly reduces the lIumber of blockillg probability calculations and has beeil applied to a six hop palh alld to the '/4 nodes NSFNEf. The results are verified with the published literat ure. This melhod achieves optimal alld lIear·optimal solutions at low computational expellse and minimum prograllUllilig requiremem.

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Wavelength conversion and call connection probability in WDM networks

Cited by 19 publications

References 12 publications

Wavelength conversion and in-band crosstalk in WDM optical networks

Wavelength conversion and in-band crosstalk in WDM optical networks

Optimal Lightpath Routing in WDM Multicast Networks

Optimal Wavelength Converter Placement in Wavelength-Routed Optical Networks by Simulated Annealing

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