Synthesis of n-port networks by a matrix-continuant

A general RC active network synthesis procedure for the realization of the multiport is proposed in this paper. The method is developed and based on using matrix-continuants and simple matrix manipulations. A numerical example of the realization is also given.     

Synthesis of active RC multiport voltage transfer functions with reduced number of operational amplifiers

The transformations of the state variable matrices useful in the synthesis of multiport networks are presented. The application of these transformations gives a significant reduction in the number of operational amplifiers necessary for the realisation of the rational voltage transfer matrix.     

Neural network approach to the solution of linear complementarity problems

The paper presents the application of nonlinear neural optimization networks to solve the linear complementarity problem. Two different approaches are presented and investigated: one leading to linear and the second to quadratic optimization programming. The numerical results of illustrative examples are given and discussed.     

The distributed Bragg pulse shaper: demonstration and model

The distributed Bragg pulse shaper (DBPS) is a series of electrically switchable Bragg mirrors on a semiconductor waveguide. The DBPS encodes data packets using parallel electrical signals to set the states of the Bragg mirrors. A broad-band source pulse then probes the device to generate a high bandwidth serial wavepacket from the train of partially reflecting mirrors. This paper describes a DBPS constructed in AlGaAs. Using this device and a mode-locked Ti:sapphire laser, we create a 4-bit packet with 0.37 Tb/s burst bit rate and are demonstrate for the first time that bits in the wavepacket can be switched by electrical modulation of individual Bragg segments. We also describe a model collaborating the observed data     

Neuro-fuzzy TSK network for calibration of semiconductor sensor array for gas measurements

The neuro-fuzzy network applying Takagi-Sugeno-Kang (TSK) fuzzy reasoning for the calibration of the semiconductor sensor array is developed in this paper. The structure, as well as the learning algorithm of the neuro-fuzzy network, is presented and tested on the example of estimation of the concentration of gas components in the gaseous mixture (so-called artificial nose problem). The results of numerical experiments are presented and discussed.     

A strained-layer InGaAs-GaAs asymmetric cladding gain-coupled DFB laser with titanium surface gratings by metalorganic chemical vapor deposition

A single growth step ridge waveguide InGaAs-GaAs distributed feedback (DFB) QW laser with second-order Ti surface gratings is described. The Ti gratings introduce a periodic variation of the loss in the cavity to promote single frequency emission. The device operates on single longitudinal and lateral modes, with a threshold current of 27.9 mA and more than 30 dB of side-mode suppression.     

MQW DBR lasers with monolithically integrated external-cavity electroabsorption modulators fabricated without modification of the active region

In this letter, we report the design and operation of multiple-quantum-well distributed Bragg reflectors (MQW DBR) lasers with monolithically integrated external-cavity electroabsorption (EA) modulators without modification of the active region fabricated using only a single growth step. Devices were fabricated with operating wavelengths of 1.06, 1.07, and 1.08 /spl mu/m, which are red-shifted from the material gain peak wavelength (/spl lambda/=1.05 /spl mu/m) by 100, 200, and 300 /spl Aring/, respectively. The /spl lambda/=1.06-/spl mu/m device has a continuous-wave (CW) threshold current of 16 mA and a slope efficiency of 0.09 W/A from the modulator facet, while the /spl lambda/=1.08 /spl mu/m device has a CW threshold current of 33 mA and a slope efficiency of 0.40 W/A from the modulator facet. The /spl lambda/=1.06-, 1.07-, and 1.08-/spl mu/m device exhibits an extinction ratio of /spl ges/20 dB at a modulator bias of 1.0, 1.4, and 2 V, respectively.     

Modelling of sinusoidal function for nonlinear signal processing applications

A novel solution to the problem of sinewave generation in the range - pi to pi is presented. The proposed approach is based on the rational approximation of the sinusoidal function and its implementation using MOS circuitry. The results of practical experiments are also presented.<>     

Realisation of resistive N-port networks using operational amplifiers

A new realisation for an arbitrary resistive n-port network using operational amplifiers is presented in this paper. A simple synthesis procedure is proposed. A numerical example is also given.