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In this paper we report an experimental investigation about power consumption on access networks belonging to a wide geographical network test bed. The access components are mainly based on FTTx architectures and contain GPON, EPON, VDSL2, P2P and ADSL2+ systems. The results show that GPON is the most energy efficient access network. We also show energy saving impacts on economics of future optical...
Free space communications, using optical carriers (Free Space Optics, FSO) technology, ensure high data rates, with relatively low error rates, low power consumption and inherent security. However, FSO links are quite sensitive to atmospheric conditions. Fog droplets, but also raindrops and snowflakes, may introduce severe path attenuation which drastically reduces the channel availability. A parametric...
A promising technology for peer-to-peer connections and urban area networks is represented by wireless communications through free space using optical carrier (Free Space Optics, FSO). This technology ensures high data rates, with relatively low error rates, low power consumption and inherent security. Nevertheless FSO links are quite sensitive to atmospheric condition. Fog droplets, but also raindrops...
Free Space Optics (FSO) links are affected by several impairments: optical turbulence, scattering, absorption, and pointing. In particular, atmospheric optical turbulence generates optical power fluctuations at the receiver that can degrade communications with fading events, especially, in high data rate links. A way to mitigate FSO link outages can be to add a coding to communications. Nevertheless,...
This paper presents results about the refractivity tuning in IR emitting organic layers, achieved via photo-patterning. Results are used to design a channel waveguide. Optical field distribution shows a single mode profile at the end facet of the waveguide.
We describe reach extension in SARDANA TDM/WDM PON and show that energy efficiency of SARDANA increases when increasing the amount of broadcast traffic. 10G point-to-point optical access networks provide low efficiency for limited uplink capacity.
The activity devoted to the deployment of a new free space optics (FSO) link set up in Rome (Italy) is illustrated together with a preliminary FSO channel modelling and coupled optical/meteorological measurements. The two-way optical link at 1550 nm is about 1 km long and has a transmission rate up 1.5 Gbps. Among dust, precipitation, turbulence, fog, and any flying objects affecting the capacity...
The activity devoted to the deployment of a new free space optics (FSO) link set up in Rome (Italy) is illustrated together with a preliminary FSO channel modelling and coupled optical/meteorological measurements. The two-way optical link at 1550 nm is about 1 km long and has a transmission rate up 1.5 Gbps. Among dust, precipitation, turbulence, fog, and any flying objects affecting the capacity...
The built multi-layer SARDANA prototype proves the feasibility of extended hybrid DWDM/TDM-XGPON FTTH networks with resilient optically-integrated ring-trees architecture, supporting broadband multimedia services.
At the beginning of this decade, in early 2000, few disruptive technologies had been proposed to replace the industry standard Non-Volatile Memory (NVM) technology and to enlarge the Flash application base. A widely accepted statement was that if any technology will succeed, it will materialize in the next decade. As the end of this decade is approaching it can be noted that only one of the proposed...
In this work the impact of the optical technologies and infrastructures on the reduction of the carbon footprint maintaining high level of broadband to the end user is discussed.
An analytical radiative transfer model to account for propagation of monochromatic radiation in random media with a plane-parallel geometry is presented. The model employs an Eddington-like approach combined with the delta phase-function transformation technique. A first-order scattering correction to the Azimuth-dependent Eddington Radiative Model solution is also performed to improve the model accuracy...
A 90 nm embedded PCM technology is presented. For the first time the storage element has been integrated in a 6-ML advanced CMOS platform, exploiting the LV n-mos device as cell selector. Very good cell working window and intrinsic reliability both for storage element and selector MOS have been proven. The full integration of a 4 Mb ePCM macrocell with very few additional masks and minimal process...
In a passive optical network signalling and monitoring are very important architecture functions. The modulation of a booster amplifier laser diode pump can assist this function without corruption of downlink signals towards subscribers.
In a passive optical network signalling and monitoring are very important architecture functions. The modulation of a booster amplifier laser diode pump can assist this function without corruption of downlink signals towards subscribers.
To support reliable large array products, Phase-Change Memory (PCM) technologies must be able to retain data over the product's lifetime with very low defect rates. PCM stores data in a chalcogenide material which can be placed in either a high resistance amorphous phase or a low resistance crystalline phase. Data retention is limited by resistance loss of the amorphous phase of the material, a process...
A comparison between arsenric and phosphorus implanted self-aligned contacts is presented; by using 2D process simulations the high leakage defectivity measured on the As contacts has been explained. Its origin arises from an insufficient overlap between the contact diffusion and the field oxide, due to a shadowing effect in a critical zone of the contact.
A method used in designing test chips for defect monitorinig of VLSI processes is presented. The purpose of the method is to maximize the accuracy of defect density estimations. This is achieved by appropriate sizing of test chip structures. The optimal dimension of test structure is computed using a model relating the confidence interval for the defect density D with the sample size and test structure...
A new kind of representation of aging effects a MOS transsistors on a VD/VG diagrams is proposed. The working curue of N-channel or P-channel transistors, for different loading factors, can be easily plotted in this diagram and the regions of hole or electrons injection during the normal operating cycle identified. Since any change in transistor technology is reflected in a change of the iso-aging...
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