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The implementation of a database of digitised mammograms is discussed. The digitised images were collected beginning in 1999 by a community of physicists in collaboration with radiologists in several Italian hospitals as a first step in developing and implementing a computer-aided detection (CAD) system. All 3,369 mammograms were collected from 967 patients(More)
A modular photonic interconnection network based on a combination of basic 2x2 all-optical nodes is presented. The proposed architecture is synchronous, can operate up to 160Gb/s and exhibits self-routing capability and very low switching latency. 1. Introduction In the field of high-performance computing systems, current electronic interconnection networks(More)
Super-channel (or multi-carrier) transmission is today one of the most promising techniques for the support of high line rates, which are required to satisfy the massive increase of Internet traffic. Moreover, flex-grid optical networks seem to be the candidates for backbone networks by enabling high spectral efficiency thanks to the adoption of the ITUT(More)
Control and data plane innovations are driving the evolution of flexible grid optical networks enabling more granular reservation of spectrum portion. On the one hand, the path computation element (PCE) is evolving toward the stateful architecture to effectively perform reoptimization on existing LSPs. On the other hand, superchannels are emerging as an(More)
An advanced PCE architecture, exploiting novel PCEP extensions for flexible-grid optical networks, is proposed and experimentally validated with dynamic frequency slot assignment and format adaptation from DP-16QAM to DP-QPSK at 100Gb/s. 1. Introduction Emerging flexible wavelength switched optical networks (WSONs) are expected to provide significant(More)
Emerging services, such as high-definition Internet Protocol TV (IP-TV) or data center migration, are going to increase the amount of multicast traffic in the Internet. The support of multicast directly in the optical domain, instead of at the IP layer, is a target for reducing the amount of optical-electronic-optical conversions (thus, the network(More)
This paper aims to review the status of standardization activities on the black link (BL) and corresponding alien wavelength concepts. It discusses experimental work on filterless optical networks conducted within a dedicated Deutsche Telekom project. The general prospects and existing challenges concerning elastic extensions of the BL are also assessed.(More)
An experimental demonstration of active stateful PCE for flexgrid networks is presented. The PCE enables elastic operations on established connections and, when required, performs hitless defragmentation of spectrum resources. Experimental assessment, including shifting of 400Gbps four sub-carrier superchannel is shown.
In flexigrid elastic optical networks, filtering cascade effects strongly affect the overall transmission performance. To avoid these detrimental impairments, each lightpath is typically configured, in an independent way, to encompass additional spectrum resources. Thus, the flat central region of the traversed filters are exploited and their transition(More)
—Time-frequency packing (TFP) transmission provides the highest achievable spectral efficiency with a constrained symbol alphabet and detector complexity. In this work, the application of the TFP technique to fiber-optic systems is investigated and experimentally demonstrated. The main theoretical aspects, design guidelines, and implementation issues are(More)