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Summary form only given. The word "cloud computing" is creating a buzz in the IT Industry today and is being looked upon as the foundation of the "fourth wave" of technology termed as "IT everywhere". While the different companies are gearing up to be a part of the "cloud" the significant drivers of this new paradigm are lowering of cost and increasing efficiencies...
Silicon photonics opens up new possibilities for the realization of diverse photonic devices and components required for advanced optical communication systems. One of the key building blocks developed on silicon-on-insulator (SOI) wafer is the optical micro-ring resonator. In this invited talk we will consider the basic theory of optical micro-ring resonator and analyse the side-coupled integrated...
The following topics are dealt with: advances in computers and networking; circuits and systems; electron devices; electron materials; nanoelectronics; nanophotonics; optoelectronics; lightwave technology; radiocommunication; space sciences; wireless and mobile technology.
Beyond the mobile communication explosion, the Indian Telecom Network is poised for the next wave of growth in the area of both wire-line as well as wireless broadband communication. NGN promises to leapfrog the entire network based on emerging technology of IP which is leading to convergence of networks, services and markets and providing efficiency and flexibility.
The estimation performance of radio communication and radar propagation with high degree of accuracy is possible provided the results of radio environment are also available with good degree of accuracy. There are advancements on such results both for ionized and non ionized media due to the availability of sophisticated and computer controlled with data archive facility systems. Measurements of various...
Silicon photonics is no more an emerging field of research and technology but a present reality with commercial products available on the market, where low dimensional silicon (nanosilicon or nano-Si) can play a fundamental role. After a review of the field, the optical properties of silicon reduced to nanometric dimensions are introduced. The use of nano-Si, in the form of Si nanocrystals, in the...
Germanium nanowires are attractive due to their higher carrier mobilities and lower effective masses and compatibility with Si-based CMOS devices. Semiconductor heterojunctions grown on one dimensional nanowire templates have been demonstrated to be useful for photoelectrochemical cell, light-emitting diodes, electrochromic devices, and sensor systems. This core-shell nanowire heterojunction possesses...
Quantum dots (QDs) grown by Stranski-Kranstanov method are of current interest for the application of high performance optoelectronic devices due to their unique three dimensional carrier confinement. However, one big limitation for the QD-based devices is the difficulties in predicting and controlling their operating wavelength accurately due to the extremely sensitive selforganized process of dot...
GaInNAs can be lattice matched to GaAs and emits light at useful optical communications wavelengths (1.3-1.55 micron) making it a potentially useful semiconductor material for optical communications. It has large conduction band offset making it more temperature independent than GaInAsP, the usual optical component material. It is a very interesting material as its behaviour is not that of a true...
For many applications in nanophotonics, such as near field microscopy, spectroscopy, high density optical data storage, photolithography, etc, it would be very useful to find ways to have large enough optical transmission at visible wavelengths through normally-semi-opaque metallic thin films, with (and without) subwavelength apertures. Since light fields in metallic films and subwavelength cylindrical...
The variations of drain current (ID) with drain voltages (VD) at different temperatures, namely, 27 K, 50 K and 77 K are computed for a two dimensional 10 nm GaAs MOSFET. A displaced Maxwellian model is assumed for the electron distribution and the interactions with deformation potential acoustic and polar optic phonons are considered using the analytical expressions based on a momentum conservation...
We have theoretically studied the velocity-field characteristics in zinc-blende (zb) GaN by solving the Boltzmann transport equation with the help of one-particle Monte-Carlo method. The deformation potential acoustic phonon, polar optical phonon, alloy, impurity and inter-valley phonon scatterings have been included in our computations. At an electric field of approximately 50 kV/cm, the negative...
We have calculated the gain in GaAlAs/GaAs superlattice laser taking into account the intersubband transitions of electrons via longitudinal optic ( lo) phonons. The lo phonons are treated by the dispersive continuum model. Gain variation with the well-width is studied considering both superlattice and bulk phonon model. The electron mobility is calculated and its variation with well-width is also...
This paper mainly focuses on the controlling of home appliances remotely when the user is away from the place. The system is SMS based and uses wireless technology. This system provides ideal solution to the problems faced by home owners in daily life. The system is wireless therefore more acceptable and cost-effective. The home appliance control system automates various home appliances using SMS...
We tailor the transmission spectrum of 1D photonic crystal to model a 2-channel MUX-DEMUX that exactly fulfils the ITU-T Recommendation G.694.2 for all optic CWDM system. We here incorporate two phase shift regions into the photonic band gap structure through extension of dielectric layers in specific unit cells. These phase shifts open up narrow transmission windows within the photonic band gap of...
Hall mobility and magnetoresistance coefficient of the two-dimensional electron gas in a single square quantum well of GaN are calculated in the framework of Fermi-Dirac statistics considering the relevant scattering mechanisms. A numerical iterative solution of the Boltzman transport equation is carried out to find the transport parameters. The Hall mobility is calculated at the temperatures of 30...
In this paper an application of computer controlled laser system for creating artificial rain in the atmosphere has been demonstrated. The laser pulse breaks the bond of N2 and O2 and produces excited N* and O*. These excited species take part in endothermic reactions and abstract tremendous amount of heat from the surrounding. This creates cooling, resulting in precipitation and rain fall.
The advantages of reversible logic systems and circuits have drawn a significant interest in recent years as a promising computing paradigm having application in low power CMOS, quantum computing, nanotechnology, and optical computing. This paper proposes a novel reversible multiplexer circuit with the help of all-optical Toffoli and Feynman gate. Operational principle of reversible multiplexer is...
The paper introduces a novel method for modeling powerline channels. The methodology is based on the use of three conductor transmission line. The mutual component of the three conductor line is varied to embrace the effects of multipath and impedance mismatches in the powerline is iteratively factored into the model by comparing with the measured frequency response of the powerline channel, without...
In this paper a novel scheme of optical generation of mm-wave signal have been proposed. This scheme uses successive modulation of a light wave in two Mach-Zehnder light intensity modulators. The Mach-Zehnder light intensity modulators are quadrature biased and their dc bias differ by a half-wave voltage of the modulator. The optical carrier is suppressed by a notch filter and two optical sidebands...
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