We describe a mutual synchronization mechanism observed in a model of fiber laser arrays. Though suboptimal in terms of total coherent power, the weak-link-synchronized state is far more robust than the in-phase state of a uniformly pumped array, with respect to parameter mismatch among the individual elements. We find similar dynamical behavior in a more general system of coupled oscillators w...

Device mismatch, charge leakage and nonlinear transfer functions limit the resolution of analog-VLSI arithmetic circuits and degrade the performance of neural networks and adaptive filters built with this technology. We present an analysis of the impact of these issues on the convergence time and residual error of a linear perceptron using the Least-Mean-Square (LMS) algorithm. We also identify...

We study two-color surface solitons in two-dimensional photonic lattices with quadratic nonlinear response. We demonstrate that such parametrically coupled optical localized modes can exist in the corners or at the edges of a square photonic lattice, and we analyze the impact of the phase mismatch on their properties, stability, and the threshold power for their generation. © 2009 Optical Socie...

We analyze the properties and stability of two-color discrete localized modes in arrays of channel waveguides where tunable quadratic nonlinearity is introduced as a nonlinear defect by periodic poling of a single waveguide in the array. We show that, depending on the value of the phase mismatch and the input power, such two-color defect modes can be realized in three different localized states...

The onset of stochastic oscillations in gyrotrons is studied by means of the self-consistent theory describing nonstationary processes. Complicated alternating sequences of regions of stationary, automodulation, and chaotic oscillations are found in the plane of the generalized gyrotron variables: cyclotron resonance mismatch and dimensionless current. The results of the investigations are impo...

This paper presents a switched current multiplier, dedicated for the use in highly parallel computation arrays or neural networks. It is designed for 3V supply voltage, performing 50k multiplications per second with a power dissipation of 100nW and an accuracy better than 1.5% considering the presence of possible device-mismatch. 2nd Electronic Circuits and Systems Conference ECS’99, 6-8th Sept...

We use beam tracing -- implemented with a newly-written code, Scotty and the reciprocity theorem to derive model for linear backscattered power of Doppler Backscattering (DBS) diagnostic. Our works both O-mode X-mode in tokamak geometry (and certain regimes stellarators). present analytical derivation our its implications on DBS signal localisation wavenumber resolution. To determine these two ...