Alcatel-Lucent

About: Alcatel-Lucent is a based out in Stuttgart, Germany. It is known for research contribution in the topics: Signal & Network packet. The organization has 37003 authors who have published 53332 publications receiving 1430547 citations. The organization is also known as: Alcatel-Lucent S.A. & Alcatel.

Fabricating complex three-dimensional nanostructures with high-resolution conformable phase masks

Abstract: High-resolution, conformable phase masks provide a means to fabricate, in an experimentally simple manner, classes of 3D nanostructures that are technologically important but difficult to generate in other ways. In this approach, light passing through a phase mask that has features of relief comparable in dimension to the wavelength generates a 3D distribution of intensity that exposes a photopolymer film throughout its thickness. Developing this polymer yields a structure in the geometry of the intensity distribution, with feature sizes as small as 50 nm. Rigorous coupled-wave analysis reveals the fundamental aspects of the optics associated with this method; a broad-range 3D nanostructures patterned with it demonstrates its technical capabilities. A nanoporous filter element built inside a microfluidic channel represents one example of the many types of functional devices that can be constructed.

Article comprising a micro-structured optical fiber, and method of making such fiber

Abstract: Disclosed are non-periodic microstructured optical fibers that guide radiation by index guiding. By appropriate choice of core region and cladding region, the effective refractive index difference Δ between core region and cladding can be made large, typically greater than 5% or even 10 or 20%. Such high Δ results in small mode field diameter of the fundamental guided mode (typically<2.5 μm), and consequently in high radiation intensity in the core region. Exemplarily, a fiber according to the invention has a solid silica core region that is surrounded by an inner cladding region and an outer cladding region. The cladding regions have capillary voids extending in the axial fiber direction, with the voids in the outer cladding region having a larger diameter than those in the inner cladding region, such that the effective refractive index of the outer cladding region is greater than that of the inner cladding region. Non-periodic microstructured fiber potentially has many uses, e.g., as dispersion compensating fiber (with or without dispersion slope compensation), as amplifying fiber, as laser, as saturable absorber, for fiber gratings, and for non-linear elements. A method of making microstructured fiber is also disclosed.

Technique for obtaining and exchanging information on world wide web

Abstract: Computer users may utilize different web browsers to access a server system on the World Wide Web (WWW) to create or join a collaborative browsing session. The users or collaborators in a session are connected by one or more controllers in the server system. When a collaborator creates or joins a session, mobile code is transmitted from the system to the collaborator's computer to create a surrogate thereon, which monitors the collaborator's interaction with a web browser on the computer. The controllers communicate with all the surrogates of the collaborators to coordinate the collaborative browsing effort. When one of the surrogates detects a change by a collaborator of a uniform resource locator (URL), the new URL is communicated through the controllers to the surrogates of all other collaborators in the session. As such, the collaborators are able to move from one URL to another to browse information in a synchronous manner. In addition, the collaborators can interactively communicate with one another in real time through the respective surrogates during the session.

Two-Dimensional Mapping of the Electrostatic Potential in Transistors by Electron Holography

Abstract: We demonstrate the first successful mapping of the two-dimensional electrostatic potential in semiconductor transistor structures by electron holography. Our high resolution 2D phase maps allow the delineation of the source and drain areas in deep submicron transistors. By measuring the mean inner potential of Si and surface depletion effects in thin cross-section samples, we have directly determined the 2D electrostatic potential distribution with 10 nm spatial resolution and 0.1 V sensitivity. We discuss the sensitivity limits of the technique, and outline its possible applications in the study of solid state reactions in two dimensions within a few nanometers of the surface.

Power management techniques for mobile communication

Abstract: In mobile computing, power is a hmited r=ouce. Like other devices, communication devices need to be prop erly managed to conserve energy. In this paper, we prment the design and implementation of an innovative trartspori level protocol capable of significantly reducing the power usage of the communication device. The protocol achieves power savings by selectively choosing short periods of time to suspend communications and shut down the communication device. It manages the important task of queuing data for future dehvery during periods of communication suspension, and decides when to restart communication. We *O address the tradeoff between reducing power consumption and reducing delay for incoming data. We present resdts from experiments using our implementation of the protocol. Th=e experiments measure the energy consumption for three simrdated communication patterns and compare the effects of different suspension strategies. Our r-tits show up to an 83~0 savings in the energy consumed by the communication. This can translate to a 6-9% savings in the energy consumed by an entire high end laptop or a savings of up to 40% for current hand-held PCs. The resdting delay introduced is sm~ (0.4-3.1 seconds depending on the power management level).