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In this paper we discuss filtering schemes for performing wavelength conversion with QD-SOA. We identify that the selection of the optimum filter depends on the operating regimes of the nonlinear device. Experimental implementations of the proposed schemes demonstrate efficient wavelength conversion with high quality factors.
Nonlinear coupled equations that describe propagation of optical pulses in coupled microring resonators under the slowly varying envelope approximation can be solved by a simple explicit finite-difference scheme. The technique, which is based on upwind differencing, is demonstrated by using an example of Kerr-nonlinear structure consisting of one microring resonator coupled to a waveguide. This enables...
In this paper, a new MAC protocol for OBS networks is introduced, described and evaluated. Into operation, DAOBS avoids burst collisions in the core of the network by controlling the way OBS nodes access the optical channel. Assuming no wavelength conversion capabilities in the network, DAOBS is assessed and compared to standard deflection routing through simulations. From the results, DAOBS offers...
An interferometric setup for measuring Polarization Mode Dispersion (PMD) setup was tested. Using a low-coherence technique with a Michelson interferometer, it was possible to measure values of PMD from detected Differential Group Delay (DGD) values in two reels. The low-coherence source bounds the minimum value of DGD detected to 0.13 ps, leading to a minimum value detected around 0.14 ps. The mean...
Optical burst switching and packet switching require the adoption of suitable contention resolution mechanisms at the optical nodes due to multiple packets/bursts attempting to access the shared output channel at the same time. Contentions can be solved by exploiting the space, wavelength and time domain. The many alternatives possible call for suitable scheduling policy aiming at an optimal system...
A new dynamic bandwidth allocation algorithm for long-reach Ethernet passive optical networks is proposed in order to provide client differentiation. The new algorithm differs clients as it takes into consideration the service level agreement (SLA) contracted by each subscriber, achieving better performance for the highest service level agreements in terms of the mean packet delay. Moreover, the algorithm...
Optical burst switching (OBS) provides statistical time multiplexing in the optical domain. A key feature to core networks, it is problematic for access lines. Scarce resources per customer require collision avoidance in the uplink respectively pre-planned scheduling. The just-enough-time (JET) one-way signalling scheme provides neither option. To achieve end-to-end burst switching, solutions for...
This paper proposes and evaluates network survivability of optical paths in metro wavelength division multiplexing (WDM) based storage area networks (SANs). The paper begins with a background and motivation. Subsequently, the network architectures along with their medium access control (MAC) protocols are described. In this work, one link failure (a single cable cut) in metro WDM based SANs in a ring...
This paper introduces a new strategy to provide QoS in IP/OBS networks, using routing with prioritization based on statistics (RPBS). This proposal uses the feedback scheme in optical networks to provide statistical knowledge with the objective of finding a suitable route for reach each destination from a specific source node, with more chance of success. This yields a twofold outcome. First, the...
Overlay applications are generating most of the traffic in today's Internet. Therefore, the impact of the increasing P2P traffic on ISP's Capital and Operational Expenditures (CAPEX/OPEX) is one of its major concerns. In this paper, an overview of ISP methods for P2P traffic management is provided. The ISP has to consider the optimization of this traffic and its associated operational costs. Therefore,...
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