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Wavelength division multiplexing (DWDM ) based all-optical networks have since become the promising solution to the unprecedented increasing demands for bandwidth. However the continued use of electronic switch architectures/routers serves as bottlenecks solely because of the impairment between switching capability and transmission speeds as the earlier continues to lag quite significantly. In a bid...
Crosstalk is an intrinsic drawback of optical networks and avoiding crosstalk is important for making fruitful application of optical switching networks. Rearrangeable optical Multistage Interconnection Networks (MINs) are feasible since they have lower complexity than their strictly counterparts. In this paper, we propose a crosstalk free routing algorithm of optical MINs and we apply it to three...
In this paper, we propose the new architecture of the optical switching fabric which is based on the baseline switching network. Traditional baseline switching networks are composed of 2 ?? 2 (or d ?? d) switches. The new architecture considered in this paper is constructed from 2 ?? 2, 3 ?? 3, 2 ?? 3 and 3 ?? 2 switching elements. We show, that the proposed architecture requires less crosspoints...
In WDM all-optical networks, physical impairments degrade optical signal to noise ratio (OSNR). Therefore, the quality of a lightpath must be checked during connection setup. Since during a lightpath setup, it may inject crosstalk on all previously established lightpaths with which it shares links or nodes, OSNR for those lightpaths should be checked as well as the OSNR of the tentative lightpath...
In GMPLS-based transparent optical networks, the switching and routing functionalities are performed in optical domain. However in these networks, physical layer impairments (PLIs) incurred by non-ideal transmission media accumulate along an optical path, and the overall effect determines the feasibility of lightpaths. Introducing transparency in optical layer reduces the possibility of GMPLS protocols...
Physical layer attacks in transparent optical networks are a serious security threat to network operation. We propose a novel protection approach based on wavelength assignment which limits the maximal propagation of intra-channel crosstalk attacks.
Envisaged transparent modulation format conversion from 2-channels OOK to QPSK in future wavelength-path networks, a novel FWM-induced crosstalk-aware dynamic RWA algorithm is demonstrated to minimize the blocking probability.
For faster connection establishment, previously proposed Pruned Vertically Stacked Optical Banyan (P-VSOB) networks used plane fixed routing (PFR) algorithm, and has O(log2N) routing complexity. Blocking probability has also been analyzed for these kinds of networks with given amount of crosstalk. In EP-VSOB networks, a few regular banyan planes are added with the PVSOB networks. Necessary routing...
Crosstalk is an intrinsic drawback of an optical network, and avoiding crosstalk is important for making fruitful application of optical switching network. In this paper, we apply the well-known semi-permutation technique on generalized recursive network (GRN) to make it crosstalk free. GRN has reasonable path independent signal loss and crosstalk. Using the methodology presented in this paper, that...
To guarantee a high switching speed, routing in vertically stacked optical banyan (VSOB) networks needs special attention so that connections are established as fast as possible. Previously proposed Pruned Vertically Stacked Optical banyan (P-VSOB) networks used Plane Fixed Routing (PFR) algorithm, and has O(log2N) time complexity. Blocking probability has also been analyzed for these kinds of networks...
In this paper, we explore the idea of integrating the remove last pass (RLP) algorithm to the fast zero (FastZ) algorithm as the prior initial solution to improve routing performance in optical multistage interconnection networks (OMINs). OMINs are popular for its cost-effectiveness and self-routable characteristics to meet the demand for high speed switching capability. A great challenge in dealing...
We illustrate the importance to consider physical uncertainties in the quality of transmission estimators used for impairment constrained based routing. Power uncertainties of 1 dB yield 80% of further regenerators.
A dynamic routing and wavelength allocation technique with interplay between physical and network layer parameters encompassing four-wave mixing (FWM) awareness and the teletraffic performance of wavelength-routed optical networks has been proposed under a distributed approach. In this paper we present an online RWA encompassing FWM-induced crosstalk based upon an impairment-constraint-based routing...
Attacks in Transparent Optical Networks present a serious security threat to successful network operation due to the high data rates involved and the vulnerabilities associated with transparency. Typical physical layer attacks can involve injecting high-powered jamming signals on legitimate data channels to exploit vulnerabilities in optical components such as crosstalk in switches and fibers, and...
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