Generating Hpotheses of Trends in High-Dimensional Data Skeletons

  • Ho T.
  • Pokharkar S.
  • Reddy C.

We seek an information-revealing representation for high-dimensional data distributions that may contain local trends in certain subspaces. Examples are data that have continuous support in simple shapes with identifiable branches. Such data can be represented by a graph that consists of segments of locally fit principal curves or surfaces summarizing ...

Are Concurrent Programs That Are Easier to Write Also Easier to Check?

  • Namjoshi K.

This paper presents an argument for using message passing constructs to structure concurrent programs, based on ease of expression and verifiability.

Squeezed states produced by modulation interaction and phase conjugation in fibers

  • Mckinstrie C.

Number-state expansions are derived for the squeezed states produced by four-wave mixing (modulation interaction and phase conjugation) in fibers. These expansions are valid for arbitrary pump-induced coupling and dispersion-induced mismatch coefficients. To illustrate their use, formulas are derived for the associated field-quadrature and photon-number variances and correlations.

Iterative Soft Multiuser Detection for MIMO MC-CDMA Systems

  • Huang D.
  • Luo Z.

In this paper, an iterative soft multiuser detection (MUD) algorithm is proposed for multiple-input multiple-output multi- carrier code-division multiple access (MIMO MC-CDMA) systems. Based on an equivalent system model, an efficient soft MUD algorithm is first derived by the central limit theorem, the property of the complex Gaussian distribution, and ...

High Speed Transparent Optical Networks

  • Sethumadhavan C.

Recent progresses in long haul transparent optical networks that support high data rates are reviewed. Advanced modulation formats and passband-optimized reconfigurable add/drop multiplexers are some of the key enablers for next generation optical networking.

Wideband Mixed Lumped-Distributed-Element 90° and 180° Power Splitters on Silicon Substrate for Millimeter-Wave Applications

  • Baeyens Y.
  • Chen Y.
  • Chen Y.
  • Liang H.
  • Lin J.
  • Lin Y.

This paper presents two millimeter-wave lumped distributed 90° and 180° power splitters fabricated in the backend-of-the- line (BEOL) of a 0.18 ?m SiGe BiCMOS technology. The 180° and 90° power splitters based on mixed lumped-distributed- element three-port Wilkinson power divider with phase shifters at the outputs are shown to achieve ...

On Server Dimensioning for Hybrid P2P Content Distribution Networks

  • Borst S.
  • Walid A.

One of the key questions arising in the dimensioning of a hybrid P2P content distribution system is that of the required infrastructure support in terms of server bandwidth. We develop and propose simple mathematical models as a methodology for analyzing and dimensioning hybrid peer-to-peer content distribution networks. We first use ...

Scalable Content-Based Routing in Pub/Sub Systems

  • Majumder A.
  • Rastogi R.
  • Shrivastava N.
  • Srinivasan A.

In this paper, we develop a framework and algorithms for achieving scalable and communication-efficient dissemination of content in pub/sub systems. To maximize communication sharing across subscriptions, our routing framework groups subscriptions based on similarity, and transmits content matching one or more subscriptions in a group over a single dissemination tree ...

Superhydrophobic membranes with electrically controllable permeability and their application to “smart” microbatteries

  • Cirelli R.
  • Frahm R.
  • Kolodner P.
  • Krupenkin T.
  • Lifton V.
  • Roman D.
  • Simon S.
  • Steinka B.
  • Taylor J.
  • Vyas B.

Electrically-tunable membranes with controllable permeability have been proposed and experimentally demonstrated by combining nano- and micro-structured superhydrophobic surfaces with the phenomenon of electrowetting. Electrowetting allows dynamical tuning of the contact angle that the liquid forms with the walls of the membrane pores, thus controlling the flow of the liquid through ...

A Hybrid Photonic-Integrated Electroabsorption Modulator Device for 50-Gb/s DQPSK generation

  • Alexandre F.
  • Bernasconi P.
  • Buhl L.
  • Cappuzzo M.
  • Chen Y.
  • Decobert J.
  • Dupuis N.
  • Earnshaw M.
  • Garreau A.
  • Giles R.
  • Gomez L.
  • Jany C.
  • Kang I.
  • Kazmierski C.
  • Landreau J.
  • Lee J.
  • Leven A.
  • Liu X.
  • Rasras M.
  • Raybon G.
  • Sethumadhavan C.

We report a compact hybrid photonic-integrated optical device consisting of AlGaInAs/InP electroabsorption modulators and a four-arm silica-on-silicon planar lightwave circuit optical interferometer. We use the device to generate 50-Gb/s NRZ-DQPSK signal with excellent performances comparable to those of the commercial lithium niobate DQPSK modulators, while requiring only 2.5Vpp drive signals

Methods for Linear and Differential Cryptanalysis of Elastic Block Ciphers

  • Cook D.
  • Keromytis A.
  • Yung M.

The elastic block cipher design employs the round function of a given, b-bit block cipher in a black box fashion, embedding it in a network structure to construct a family of ciphers in a uniform manner. The family is parameterized by block size, for any size between $b$ and $2b$. ...

The Effect of Bridge-and-Roll on Minimizing Wavelength Conversion

  • Fortune S.
  • Zhang Y.

The number of wavelength conversions required to handle dynamic traffic in a WDM network is significantly more than for comparable static traffic. However, this excess can be substantially reduced with bridge-and-roll.

Improved Nonlinear Tolerance of 112-Gb/s PDM-OFDM in Dispersion- Uncompensated Transmission with Efficient Channel Estimation

  • Buchali F.
  • Liu X.

We show that the signal-channel nonlinear tolerance of a 112- Gb/s PDM-OFDM signal coherently detected with a novel channel estimation scheme, is substantially improved by fiber dispersion. Preliminar simulation results on WDM performance are also discussed.

High Spectral Efficiency Modulation for High Capacity Transmission

  • Essiambre R.
  • Foschini G.
  • Kramer G.
  • Winzer P.

We discuss the impact of amplification technologies, multi- level constellations, and fiber nonlinearity of the spectral efficiency achievable in fiber-optic networks.

Direct 50-Gb/s RZ-DQPSK generation using hybrid photonic-integrated electroabsorption modulators

  • Alexandre F.
  • Bernasconi P.
  • Buhl L.
  • Cappuzzo M.
  • Chen Y.
  • Decobert J.
  • Dupuis N.
  • Earnshaw M.
  • Garreau A.
  • Giles R.
  • Gomez L.
  • Jany C.
  • Kang I.
  • Kazmierski C.
  • Landreau J.
  • Lee J.
  • Leven A.
  • Liu X.
  • Rasras M.
  • Raybon G.
  • Sethumadhavan C.

We report direct generation of 50-Gb/s RZ-DQPSK signals using an electroabsorption modulators-based hybrid modulator without using an extra pulse carver. We demonstrate the first error- free 50-Gb/s DQPSK generation using a semiconductor-based modulator with low drive voltages of 2.3V.

Signal Power Transients in Transparent Network

  • Kilper D.
  • Sethumadhavan C.
  • White C.

The modification of transient channel-power excursions due to propagation through nodes with different add-drop configurations are observed through experiments. Simulations results demonstrate similar propagation of channel power excursions through transparent networks.

Quasiparticle Tunneling in the Fractional Quantum Hall State at v = 5/2

  • Kastner M.
  • Marcus C.
  • Miller J.
  • Pfeiffer L.
  • Radu I.
  • West K.

Theory predicts that quasiparticle tunneling between the counter- propagating edges in a fractional quantum Hall state can be used to measure the effective quasiparticle charge e and dimensionless interaction parameter g, and thereby characterize the many-body wavefunction describing the state. We report measurements of quasiparticle tunneling in a high mobility ...

Synthesis and Optimization of Pipelined Packet Processors

  • Edwards S.
  • Hadzic I.
  • Soviani C.

We consider pipelined architectures of packet processors consisting of a sequence of simple packet processing modules interconnected by FIFO buffers.We propose a new model for describing their function, an automated synthesis technique that generates efficient hardware for them, and an algorithm for computing minimum buffer sizes that allow such pipelines ...

Itinerant Ferromagnetism in an Atom Trap

  • Berdnikov I.
  • Coleman P.
  • Simon S.

We propose an experiment to explore the magnetic phase transition in interacting fermionic systems, and establish signatures of ferromagnetic correlations in the observed ground states. We find, that for large trap radii (R> 4, in units of coherence length), ground states are topological in nature, a “skyrmion” in 2D, and ...

Paired composite fermion phase of quantum Hall bilayers at nu=1/2 + 1/2

  • Moller G.
  • Rezayi E.
  • Simon S.

We provide numerical evidence for composite fermion pairing in quantum Hall bilayer system at filling nu=1/2+12/ for intermediate spacing between the layers. We identify the phase as p_x + i p_y pairing, and construct high accuracy trial wavefunctions to describe the groundstate on the sphere. For large distances between the ...