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An adaptive variance reduction technique was recently proposed to efficiently study transmission errors induced by polarization-mode dispersion (PMD) in optical fiber transmission systems. The technique combines importance sampling (IS) and the cross entropy (CE) method to bias Monte Carlo simulations. Here we (i) present a detailed study to quantify the computational efficiency of this technique, (ii) introduce a novel variant of the hinge model for PMD in optical fiber communication systems, and (iii) use the IS-CE technique to compare the statistical properties of various hinge models. Specifically, we compare the statistics of PMD-induced transmission impairments due to the traditional hinge model (isotropic hinge output), the waveplate hinge model (anisotropic hinge output), and the novel variant of the waveplate hinge model introduced here. We use computationally efficient expressions to determine the probability density function of the differential group delay, and we couple these techniques with the outage map method to compute statistical probabilities of system outages, as quantified by the noncompliant capacity ratio.

Green is a live round tripping UML class diagram editor plug-in for Eclipse, originally designed with the intention of focusing CS1/CS2 students on modeling and design. Green's ease of use and flexible features has allowed it to grow into a robust tool providing end users with an easy to use application satisfying their individual class diagramming needs. Green's live round tripping capability allows users to generate (Java) code from UML class diagrams and generate diagrams from (Java) code and have them both update each other as any changes are made. This demo will demonstrate the main features of Green, including forward and reverse engineering, live roundtripping, incremental exploration, and the various aspects of relationship semantics. Since Green is an ongoing project, demonstrations of additional features not in this list may also be included.

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