Polarization Dependent Parametric Gain in Amplifiers with Orthogonally Multiplexed Optical Pumps

  • C. Headley
  • C.G. Jorgensen
  • Jopson R.
  • K. Brar
  • Mckinstrie C.
  • Radic S.

We show that the orthogonal pump configuration does not guarantee the polarization insensitive operation of two-pump parametric amplifiers. Experimental observations are made with various lengths of highly nonlinear optical fiber to demonstrate the polarization dependence of the parametric gain.

Effects of Transmitter Imperfection on Polarization Mode Dispersion Impairments

  • Moeller L.
  • Shen S.
  • Xie C.

We show that transmitter imperfection, suvh as timing and amplitude jitters, pulse shape distortion, can significantly increase polarization mode disperssion (PMD) impairments in optical transmission systems, especially for systems with large differential group delay (DGD).

Alternating Subspace-Spanning Resampling to Accelerate Markov Chain Monte Carlo Simulation

  • Liu C.

This paper provides a simple method to accelerate MCMC sampling algorithms, such as the data augmentation and the Gibbs sampler, via alternating subspace-spanning resampling (ASSR). The ASSR algorithm often shares the simplicity of its parent sampler but has dramatically improved efficiency. The methodology is illustrated with Bayesian estimation for analysis ...

Telecommunications Industry's View of Profitable

  • Furman D.
  • Wang Q.

This paper presents an analytical model that complements empirical studies for determining the profitability of a segment in the telecommunications industry. By considering impacts of technology innovation, which is a non-incremental force that drives market development, and simulating carrier's optimal decision-making, we show that in order for the segment to ...

An Implementation of Causal Memories Using the Writing Semantic

  • C. Spaziani
  • R. Baldoni
  • S. Tucci-Piergiovanni
  • Tulone D.

Causal consistency has been introduced to increase wait-free concurrent accesses to a shared memory. Contrary to sequential consistency, causal consistency allows independent write operations, with respect to the causality relation, to be executed in different orders at each distinct process. This paper introduces a protocol for fully replicated settings which ...

Real-Time Implementation of Linear Spectrograms for the Characterization of High Bit-Rate Optical Pulse Trains

  • Dorrer C.
  • Kang I.

The complete characterization of 40 Gb/s train of optical pulses is performed in real time using spectrograms. This tool competes very favorably with electronic sampling scopes in terms of bandwidth and is used for real-time optimization.

Laser Excess Noise Reduction in Optical Phase Shift Measurements

  • Mitrofanov O.

We describe and demonstrate an optical detection scheme for small electro-optic phase shift measurements. The scheme increases the modulation depth due to the electro-optic effect and allows broadband reduction of laser excess noise in balanced dual-differential detection ssystems. The scheme is applied in electro-optic phase shift measurement setup for integrated ...

Optical Receiver Design Trade-Offs

  • Essiambre R.
  • Winzer P.

We review performance measures and design trade-offs for optical receivers, involving the optimization of filter shapes and bandwidths. We highlight the close interaction between modulation format, transmission impairment, and receiver design.

A New Approach to Utterance Verification Based on Neighborhood Information in Model Space

  • Jiang H.
  • Lee C.

In this paper, we propose to use neighborhood information in model space to perform utterance verification (UV). At first, we present a nested-neighborhood structure for each underlying model in model space and assume the underlying model's competing models sit in one of these neighborhoods, which is used to model alternative ...

Unimpaired Idler Generation in Four-Band Amplifiers Using Co- and Counterphased Modulation Technique

  • C. Headley
  • C.G. Jorgensen
  • Centanni J.
  • Chraplyvy A.
  • Jopson R.
  • K. Brar
  • Mckinstrie C.
  • Radic S.

Two-pump parametric amplifiers are characterized by the existence of four distinct amplification bands. A new technique allows for unimpaired wavelength conversion and does not require conventional pump phase delay management.

40-Gb/s return-to-zero alternate-mark-inversion (RZ-AMI) transmission over 2000 km

  • Chandrasekhar S.
  • Gnauck A.
  • Leuthold J.
  • Raybon G.
  • Su Y.
  • Winzer P.

We report on the transmission of 40-Gbit/s modified duobinary return-to-zero (RZ-MDB) signals over more than 2000 km (20x100 km) at a bit-error ratio of 10 sup -9. The RZ-MDB signal is generated using a single, non-return-to-zero-driven modulator in combination with an optical delay interferometer.

Frequency Offset Tolerance Between Optical Source and Delay Interferometer in DPSK and DQPSK Systems

  • H. Kim
  • Winzer P.

We assess, both by measurement and simulation, the receiver performance degradation caused by frequency offsets between the optical source and the delay interferometer for NRZ and RZ, DPSK and DQPSK systems.

Capacity Of Multi-Antenna Channels In The Low-Power Regime

  • A.M. Tulino
  • Lozano A.
  • S. Verdu

This paper provides analytical characterizations of the impact on multi-antenna capacity of several important features that fall outside the standard multi-antenna model, namely, (i) antenna correlation, (ii) Ricean factors, (iii) polarization diversity, and (iv) out-of-cell interference, all in the regime of low signal-to-noise ratio. The interplay of rate, bandwidth and ...

On the Expressiveness of 3-Valued Models

  • Godefroid P.
  • R. Jagadeesan

Three-valued models and logics have been recently advocated as being more suitable to reason about automatically-generated abstractions of reactive systems than traditional "2-valued" models such as standard Kripke structures or Labeled Transition Systems. Indeed, abstractions specified in 3-valued models are able to distinguish properties that are true, false and unknown ...

Shape Analysis through Predicate Abstraction and Model Checking

  • Dams D.
  • Namjoshi K.

We propose a new framework, based on predicate abstraction and model checking, for shape analysis of programs. Shape analysis is used to statically collect information -- such as possible reachability and sharing -- about program stores. Rather than use a specialized abstract interpretation based on shape graphs, we instantiate a ...

Lifting Temporal Proofs through Abstractions

  • Namjoshi K.

Recently, several algorithms have been developed to automatically generate a deductive proof of correctness from a model checker. A natural question, therefore, is how to "lift" a deductive proof that is generated for an abstraction back into the original program domain. In this paper, we show how this can be ...

A New Primal Screen

  • Pomerance C.

Quick, is 91 prime or composite? OK, you have that one, but how about 12345678910111213? As with 91, the answer is still relatively easy to find, since this 17-digit number is divisible by the smallish prime 113, and so it is composite. But searching for factors often gets bogged down, ...

Integration of 802.11 and Third-Generation Wireless Data Networks

  • Buddhikot M.
  • Chandranmenon G.
  • Han S.
  • Lee Y.
  • Miller S.
  • Salgarelli L.

The third-generation (3G) wide area wireless networks and 802.11 local area wireless networks possess complementary characteristics. 3G networks promise to offer always-on, ubiquitous connectivity with relatively low data rates. 802.11 offers much higher data rates, comparable to wired networks, but can cover only smaller areas, suitable for hot-spot applications in ...

Timed Fair Exchange Of Standard Signatures

  • Garay J.
  • Pomerance C.

In this paper we show how to achieve timed fair exchange of digital signatures of arbitrary type.

Polarization Mode Dispersion Induced Impairments in Different Modulation Format Systems

  • 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 ...