Comparison of Systems Tolerance to Polarization Mode Dispersion Between Different Modulation Formats

  • Haunstein H.
  • Hunsche S.
  • Moeller L.
  • Xie C.

The polarization mode dispersion (PMD) tolerance of different modulation formats is studied, including on-off-keyed, differential-phase-shift-keyed (DPSK), and carrier-suppressed return-to-zero (CSRZ) formats. It is shown that, generally, for uncompensated systems the modulation formats with larger pulse width have larger penalty, while the modulation formats with smaller bandwidth perform better in PMD ...

Visualizing, Finding and Packing Dijoins

  • A. Vetta
  • Shepherd F.

We consider the problem of strengthening a network to become strongly connected. That is, so that between any pair of nodes, there is a directed path in each direction. We are allowed to achieve this by turning some of the network links (each at a different cost) into two-way arcs, ...

Quantum Cryptography

  • Vanenk S.

I'll give a review of Quantum Cryptography: How the ideal quantum-cryptographic protocol works, and what the differences are between this ideal protocol and its implementation in practice. Furthermore, I'll discuss the state-of-the-art in Quantum Key Distribution, and what improvements are possible.

Quantum State Discrimination of Coherent States

  • Vanenk S.

I'll discuss linear optics implementations of several quantum state discrimination tasks, applied to coherent states. Both unambiguous state discrimination and quantum hypothesis testing are considered. Applications to quantum cryptography are pointed out.

Spectral Efficiency of Coded Phase Shift Keying for Fiber Optical Communication

  • Ashikhmin A.
  • De Lind Van Wijngaarden A.
  • Kramer G.
  • Wei X.

Several optical modulation and detection schemes are compared by computing their spectral efficiencies over a simple channel model. It is found that quadrature phase shift keying (QPSK) can be substantially more bandwidth efficient than either direct-detection on-off keying (DD-OOK) or binary phase-shift keying (BPSK). However, the energy gains of QPSK ...

Mirage: A Tool for Interactive Pattern Recognition from Multimedia Data

  • Ho T.

We describe Mirage, a software tool designed for interactive exploration of the correlation of multiple partitional or hierarchical cluster structures arising in different contexts. The tool shows projected images of point classes and traversals of proximity structures in one, two, or higher dimensional subspaces, in linked views of tables, histograms, ...

Two-Pump Fiber Parametric Amplifiers

  • Mckinstrie C.
  • Radic S.

The operational features of two-pump fiber parametric amplifiers cannot be matched by conventional, single-pump devices. New degrees of design freedom can be used to construct gain equalized amplifier operating over a broad spectral range. The two-pump device is characterized by four parametric bands that can be used for flexible, unimpaired ...

Pixel Navigator - A Simple Mobile Internet Paradigm

  • Battaglia F.
  • Ong P.
  • Rana A.

The rise of the World Wide Web and the market growth of mobile devices with advanced data capability make the mobile Internet the inevitable next big wave of technology. Due to the form factor limitation, mobile device will never be used as a Web browsing tool like its desktop counterpart. ...

A 24 Mbps Radix-4 LogMAP Turbo Decoder for 3GPP-HSDPA Mobile Wireless

  • Bickerstaff M.
  • Davis L.
  • Garrett D.
  • Nicol C.
  • Thomas C.

A radix-4 logMAP turbo decoder for high-speed 3G mobile data terminals is described. It processes 3GPP data streams including those coded for the High Speed Downlink Packet Access (HSDPA) mobile wireless standard [1] with up to 16 decoder iterations. Higher data rates, up to 24Mbps, are supported with 3GPP compliant ...

A 19.2 Mbps 4x4 BLAST/MIMO Detector with Soft ML Outputs (NOT KNOWN IF TALK GIVEN)

  • Davis L.
  • Garrett D.
  • Woodward G.

This paper presents a silicon device that performs ML detection and produces soft outputs approximating the log-likelihood ratios (LLRs) of the a posteriori probabilities (APPs) for each of the transmitted bits. This algorithm is termed ML-APP. The ML search is achieved with a parallel processing architecture that exploits the symmetry ...

Simplified Bilayer Process for T-gates and Gamma-gates Using 100kV e-beam Lithography

  • I.E. Ocola
  • P.D. Ye
  • Tennant D.

This paper describes the use of a unique combination of an environmentally stable chemically amplified photoresist (UV113, Shipley) and a copolymer of methyl styrene and chloro methyl acrylate P(MS/CMA) resist (ZEP520, Zeon), without any additional intermediate layers, in the fabrication of high-resolution T-gates and Gamma-gates. The two resists used are ...

16-Channel Digitally Tunable External-Cavity Laser with Nanosecond Switching Time

  • C. Goullancourt
  • J. Honthaas
  • Kauer M.
  • Leuthold J.
  • M. Girault
  • O. Pellegri
  • Zirngibl M.

We present a 16-channel 100 GHz-spacing digitally tunable packet switching transmitter based on a novel external-cavity laser design. The transmitter can switch within 0.8 ns between its channels at 0 dBm output power and <0.7 dB penalty when switched from just above threshold and within 20 ns and 0.5 dB ...

Multi-Channel Shared PMD Compensation in WDM Systems

  • Liu X.
  • Xie C.

We propose a novel polarization-mode dispersion (PMD) compensation scheme for wavelength division multiplexing (WDM) systems, in which many WDM channels share one or a few PMD compensators at receiver site. It is shown, both analytically and numerically, that the performance of this scheme can achieve virtually the same performance as ...

Amplified Spontaneous Emission Noise in Pulse-Pumped Raman Amplifiers

  • C. Headley
  • C. Horn
  • K. Bromage
  • L.E. Nelson
  • M.D. Mermelstein
  • Winzer P.

In this paper we discuss amplified spontaneous emission (ASE) generated in Raman amplifiers that are counter-pumped with trains of pulses. Our experimental and theoretical results show that if the peak power of the pump pulses is too high, the ASE output from the amplifier can be significantly higher than from ...

Novel Geometry for an Integrated Channel Selector

  • Bernasconi P.
  • Cabot S.
  • Miller B.
  • Sauer N.
  • Stulz L.
  • Vanthourhout D.
  • Yang W.
  • Zhang L.

A monolithically integrated channel selector with power monitor is proposed in a new reflective configuration. One star coupler, one arrayed waveguide grating, and a minimum number of SOA gates are used to achieve loss free transmission. A 32-channel device controlled by only 12 SOA-gates is realized in InP. Low on-chip ...

Frequency Assignment for Multi-Cell IEEE 802.11 Wireless Networks

  • Leung K.

In this paper, by focusing on interference among access points, we formulate the channel assignment for the 802.11 network as a 0-1 programming problem, where one version of the problem is shown to be NP-complete. In light of computational complexity, a heuristic algorithm is proposed and analyzed. The algorithm is ...

Multiuser Detection and Turbo Multiuser Decoding for Asynchronous Multitone Multiple Access Systems

  • Tonello A.

We consider multicarrier multiple access architectures that are based on combining discrete multitone (DMT) or filtered multitone (FMT) modulation with multplexing of tones across users. Communications are asynchronous, e.g., uplink cellular communications. Optimum multiuser detection is formulated for demodulation of multitone signals that experience time and frequency asynchronism and propagate ...

Performance Limits of Multicarrier Based Systems over Fading Channels with Optical Detection

  • Tonello A.

We investigate the performance limits of optical detection of multicarrier modulation over time-variant frequency selective fading channels. We consider general multicarrier architectures where parallel information signals are transmitted through sub-channels that are shaped with the deployment of sub-channel transmit filters. The discrete-time implementation is generally referred to as filtered multitone ...

Multiuser Detection/Decoding in Asynchronous Multitone Multiple Access Systems

  • Tonello A.

We formulate the optimum multicarrier multiuser detector to be deployed in asynchronous multitone multiuser systems. These multiple access systems are based on combining discrete multitone (DMT) or filtered multitone (FMT) modulation with multiplexing of tones across distinct users. Communications are asynchronous, e.g., uplink cellular communications: signals belonging to distinct users ...

25 dBm OPI3 Low-Noise Amplifiers Fully Integrated in 0.25 mum CMOS

  • Boric-Lubecke O.
  • J. Lin
  • P. Gould

High dynamic range, low noise Si-MMIC amplifiers designed for GSM 900 and DCS 1800 base station receivers are reported. These amplifiers are fully integrated in a low-cost 0.25 mum CMOS technology. Noise figures of 1.2 dB and 1.7 dB are achieved at 900 MHz and 1800 MHz, respectively, with associated ...