bluuebunny/crossref_metadata_2025_split huggingface dataset:
Evolution of a stokes wave pumped by an elementary soliton propagating in optical fibers
Authors: Zhao Y. , Yang S. W. , Tu B. F. 
Published: July 2007

AbstractThe production of a Stokes wave due to a Raman effect pumped by an elementary soliton propagating in optical fibers is studied analytically and numerically. The approximated analytical results show that cross‐phase modulation results in the added periodical amplification of the Stokes wave, and the maximum amplification distance exists due to the soliton pump fiber loss. The numerical results show that the smaller the pulse walk off, the greater the effect of the energy transfer from the soliton to the Stokes wave. © 1993 John Wiley & sons, Inc.
Application of filter theory in the design of twas based on FETS with different gate widths
Authors: Paoloni Claudio , Kosslowsky Stefan 
Published: July 2007

AbstractA generalized approach for the design of traveling wave amplifiers will be presented. Compared to conventional methods our procedure introduces filter techniques in the TWA design. The main advantage is an improved input and output VSWR of the circuit. A complete amplifier design based on available technological process parameters will be demonstrated. The introduction of normalized parameters and charts results in a process‐independent applicability of the method. The method is well matched to the facilities of MMIC design since the demand for FETs with different gate widths can be satisfied easily. © 1993 John Wiley & sons, Inc.
Electromagnetic far‐field pattern modeling for an active microstrip antenna module
Authors: McDowall D. S. , Fusco V. F. 
Published: July 2007

AbstractThe far field of an active antenna module comprising a MESFET device with microstrip element terminations is modeled using a large‐signal harmonic balance technique and discrete two‐dimensional equivalents of the planar circuit elements. Simulated results are presented for comparison with the measured performance of the real antenna. © 1993 John Wiley & sons, Inc.
Detection of longitudinal electromagnetic fields in AIR
Authors: Giakos George C. , Ishii T. Koryu 
Published: July 2007

AbstractBy means of a small square loop antenna and an electric probe it was possible to detect significant longitudinal components of magnetic and electric fields, respectively, in the far zone in the air. Unique features of this observation are the abundance and the slow variation with radial distance of the detected longitudinal electromagnetic field components which seem to decay at a rate much slower than 1/r2. © 1993 John Wiley & sons, Inc.
Three‐dimensional nanometer structures
Authors: Chou Chih‐Chung , Gregory Don A. 
Published: July 2007

AbstractThree‐dimensional (3D) structures in the nanometer range are difficult to create by conventional planar approaches. Having this capability would extend the variety of nanodevices, increase the device unit volume density dramatically, and approach a more completely miniaturized and integrated version of practical device systems. Such systems would be an advantage in signal processing because of low energy consumption and improved measurement resolution. © 1993 John Wiley & sons, Inc.
Scattering by thin lossy dielectric plates‐a finite‐difference time‐domain approach
Authors: Boonzaaier J. J. , Pistorius C. W. I. 
Published: July 2007

AbstractThis Letter discusses the computation of scattering by thin lossy nondispersive dielectrics using the finite‐difference time‐domain (FD‐TD) method. The time‐domain relationship between the electric fields normal to a lossy material boundary is used in a “smart cell” approach which allows the thickness of the dielectric to be less than the spatial grid size. These results are compared to the “brute force” FD‐TD approach. © 1993 John Wiley & sons, Inc.
Directivity versus element spacing for a scanning array
Authors: Zimmerman M. , Lee R. Q. 
Published: July 2007

AbstractIt is well known that for linear array antennas with isotropic elements, the directive gain depends upon the spacing between the elements. However, this relationship is not as well documented for planar arrays or arrays with medium gain elements, such as micro‐strip patches, particularly in scanned cases. In this article, linear, rectangular, and hexagonal arrays with both isotropic elements and medium gain elements are examined. © 1993 John Wiley & sons, Inc.
Slot synchronization in optical‐fiber ppm systems with gaussian‐type received pulse shapes
Authors: Cryan R. A. , Elmirghani J. M. H. , Clayton F. M. 
Published: July 2007

AbstractThe problem of determining the precise slot boundaries is an essential one in optical‐fiber pulse position modulation (PPM) systems due to the temporal nature of the format. Here we present an original spectral characterization of the PPM process and establish the requirements to realize a discrete spectral slot rate component. In particular we show that this component is independent of the modulation index and data probability distribution. The dependence of the component on pulse shapes is investigated and examined for the important class of dispersed Gaussian‐type pulse shapes normally associated with optical‐fiber transmission. Original practical results, measured on a 128‐slot PPM system, are presented and shown to be in agreement with the theoretical predictions to within 1 dB. © 1993 John Wiley & Sons, Inc.
The theory of chiroferrite waveguides
Authors: Shen Zhongxiang 
Published: July 2007

AbstractThe eigenvalue problem for the determination of propagation modes in a waveguide filled with a homogeneous chiroferrite medium is formulated. As an illustrative example the circular chiroferrite waveguide is analyzed, and the corresponding dispersion relations and diagrams are obtained. © 1993 John Wiley & Sons, Inc.
Broadband slant linearly polarized biconical antenna
Authors: Lakshminarayana D. , Prasad R. V. Hara , Mutiny T. G. K. 
Published: July 2007

AbstractA broadband biconical antenna with a slant linear polarizer operating over 2‐26 GHz has been designed, fabricated, and tested. The antenna has yielded a nominal VSWR of less than 3.0 and an omni deviation of within ±3.0 dB. This antenna is highly compact and hence will find applications in systems where space requirements are very stringent. © 1993 John Wiley & Sons, Inc.
A generalized eigenvalue method for fdtd analyses
Authors: Ko Wai Lee , Aksun M. Irsadi , Mittra Raj 
Published: July 2007

AbstractIn this article we apply the generalized eigenvalue method (GEM) to extract the complex exponentials from a truncated time record computed by the finite‐difference time‐domain (FDTD) code for analyzing microwave integrated circuits. To obtain accurate scattering parameters without further FDTD computations, the truncated FDTD time record is efficiently extended into the future by summing the complex exponentials with complex coefficients determined by the least‐squares method. Numerical GEM results with fewer poles are shown to be in good agreement with those obtained by the Prony method with a large number of poles. © 1993 John Wiley & Sons, Inc.
Irradiance analysis for indoor point‐to‐point and quasidiffuse infrared channels
Authors: Gabiola Francisco J. , Betancor Manuel J. , Santamaría Asunción , Polo Angel , López‐Hernández Francisco J. 
Published: July 2007

AbstractThis article deals with the calculation of the irradiance produced by an optical system made up of a lens and a nonpunctual optical source with generalized Lambertian profile (cosn ð). This calculus can be applied to predict the size and power distribution of the irradiated area in point‐to‐point and quasidiffuse channels. Theoretical results are in good agreement with experimental measurements. © 1993 John Wiley & Sons, Inc.
A comparison of nonlinear behavior between matrix and distributed amplifiers
Authors: D'agostino S. , Massenzio M. 
Published: July 2007

AbstractIn this article we present the nonlinear simulations of a matrix amplifier and compare its power‐handling capabilities to those of a two‐stage distributed amplifier. The simulations confirm our hypothesis of better performances of the matrix over the usual distributed topology both in higher output power level and lesser harmonic distortion. The somewhat larger number of active devices, as compared with other topologies, makes the matrix topology particularly well suited for monolithic implementation. © 1993 John Wiley & Sons, Inc.
Longitudinal slots in dielectric‐filled rectangular waveguides
Authors: Rengarajan Sembiam R. , Steinbeck Michael 
Published: July 2007

AbstractA longitudinal radiating slot cut in a broad wall of a dielectric filled rectangular waveguide is analyzed rigorously. Pertinent coupled integral equations for the aperture electric field of a thick wall slot are solved by the method of moments. Numerical results are presented for the slot characteristics over a range of permittivity values of the dielectric. Shunt admittance representation is found to be poor for higher values of the dielectric permittivity. © 1993 John Wiley & Sons, Inc.
Coplanar waveguide low‐pass filter using open circuit stubs
Authors: Kanamaluru Sridhar , Li Ming‐Yi , Chang Kai 
Published: July 2007

AbstractA five‐element Chebyshev low‐pass filter having high roll off, built using coplanar waveguide open circuit stubs for the capacitive elements, is investigated. Passband ripple within 1.5 dB and a stop‐band rejection of more than 45 dB is achieved. Comparison of the predicted and experimentally measured results is presented and the agreement is good. © 1993 John Wiley & Sons, Inc.
Using engineered tbcco step edge junctions as microwave mixers
Authors: Fenzi N. O. , Aidnik D. L. , Soares E. R. , Bourne L. C. , Cardona A. H. , Rohlfing S. M. 
Published: July 2007

AbstractA method for characterizing the noise and conversion loss performance of high‐temperature superconductor (HTS) nonlinear components is described. Data on conversion loss and noise figure for step edge junctions (SEJs) manufactured on HTS is presented and discussed. © 1993 John Wiley & Sons, Inc.
Effects of chirality admittance on the propagating modes in a parallel‐plate waveguide partially filled with a chiral slab
Authors: Toscano Alessandro , Vegni Lucio 
Published: July 2007

AbstractThe field distributions and cutoff equation of the propagating modes in chiral parallel‐plate waveguide are derived and the effects of chirality admittance on the cutoff wavelengths of the fundamental hybrid modes are examined. The results show that the cutoff wavelengths of the fundamental hybrid modes are approximately proportional to ζc, and that in chiral parallel‐plate waveguides, the longitudinal components of electric and magnetic fields are always coupled as in the chirowaveguide, etc.; TE, TM, or TEM modes cannot be supported. © 1993 John Wiley & Sons, Inc.
Analysis of the electro‐optic effect in anisotropic crystals with 2‐mm AND 3‐m point group symmetry using a first‐order perturbation technique
Authors: Faria J. A. Brandao 
Published: July 2007

AbstractThe results of a recently proposed perturbation approach are successfully applied to the analysis of the Pockels effect in some representative electro‐optic crystals, namely, potassium niobate and lithium niobate crystals. © 1993 John Wiley & Sons, Inc.
New three‐configuration fet deembedding method
Authors: Gerard H. , Mouquet Y. 
Published: July 2007

AbstractWe have developed a new de‐embedding method for III‐V VET chips designed without a via hole. This method makes accurate measurement of access wire inductances and pad capacitances possible, without the need for any simplifying assumptions regarding the equivalent circuit [1] or additional scaling developments [2]. © 1993 John Wiley & Sons, Inc.
Full nonlinear analysis of near‐carrier noise in discriminator‐stabilized microwave oscillators
Authors: Rizzoli Vittorio , Mastri Franco , Masotti Diego , Neri Andrea 
Published: July 2007

AbstractThe Letter demonstrates the application of modern nonlinear CAD techniques based on the harmonic‐balance method to the computation of near‐carrier noise in microwave oscillators stabilized by a discriminator‐based feedback loop. Oscillator noise is described as being generated by two basic mechanisms: a fundamental‐frequency jitter due to noise‐induced frequency modulation of the carrier, and a phase jitter due to the superposition on the carrier of upper and lower noise sidebands generated by frequency conversion in the nonlinear devices. The numerical analysis is fully general purpose and can be applied to oscillator topologies of arbitrary complexity in a straightforward way. The simulation technique is applied to an ultra‐low‐noise discriminator‐stabilized dielectric‐resonator oscillator, and is shown to exactly predict the measured noise performance of the real circuit.
Multimode operation of antenna integrated microwave quantumwell‐diode oscillator
Authors: Rydberg A. , Forsgren M. , Brugger H. , Landgraf B. , Willander M. 
Published: July 2007

AbstractTheoretical and experimental results for QW‐diode oscillators integrated with a rectangular microstrip antenna, forming an active antenna, are reported. Multimode operation is demonstrated for the active antenna, with an equivalent isotropic radiated power (EIRP) of 0.73 mW for the antenna TM01 mode, at 810 MHz. © 1994 John Wiley & Sons, Inc.
Nonlinear optical microwave interactions in microstrip linear resonators in GaAs
Authors: Kwark Bongsin , Yeh Chun‐Liang , Ho Chien‐Hsun , Weichold Mark H. , Chang Kal , Taylor Henry F. 
Published: July 2007

AbstractA new optoelectronic mixer parametric amplifier has been fabricated in semiinsulating GaAs using a microstrip linear resonator structure with photoconductive gaps. Schottky contacts were used to produce nonlinear response characteristics, which were characterized with optical and microwave excitations. Harmonic frequencies were optically generated up to 14.6 GHz by illuminating the photoconductive gap with a GaAlAs laser diode modulated near the fundamental resonant frequency of 4.9 GHz. An optical input at frequency frf was mixed with a microwave input at fLO to obtain sum and difference frequencies fLO ± frf. Parametric amplification of the optical input of up to 29 dB was obtained. © 1994 John Wiley & Sons, Inc.
A recursive LU decomposition algorithm
Authors: Twig Yigal , Kastner Raphael 
Published: July 2007

AbstractA recursive LU decomposition scheme extends the capabilities of nonrecursive algorithms for the reduction of computation time when geometrical modifications are made to a precomputed scatterer. Significant savings are achieved for cases of many different attachments, or when the initial scatterer is amenable to a particular efficient solution. © 1994 John Wiley & Sons, Inc.
On the existence condition for bistability in a one‐coupler optical fiber ring resonator by using degenerate two‐wave mixing
Authors: Ja Y. H. 
Published: July 2007

AbstractThe existence condition for bistability, B2G > 1, in a one‐coupler single‐mode optical fiber ring resonator using two different all‐fiber schemes of degenerate two‐wave mixing (DTWM) is studied in detail. It is shown that the existence condition for bistability is in general a necessary condition only, not a sufficient condition for the occurrence of the DTWM bistability. © 1994 John Wiley & Sons, Inc.
Mixing properties of a 20‐GHz‐bandwidth 1.5‐μm MQW DFB laser in Ku and Ka bands
Authors: Mathoorasing D. , Kazmierski C. , Blez M. , Ougazzaden A. , Mircea A. 
Published: July 2007

AbstractInvestigation of microwave mixing properties of MQW DFB lasers in the millimeter‐wave domain showed efficient conversion loss for both analog and digital signals. Conversion losses as low as 3, 7.5, and 14 dB have been found for a 5‐GHz local oscillator around the second, third, and fourth (20.95 GHz) harmonic frequencies, respectively. © 1994 John Wiley & Sons, Inc.
Improved computational efficiency for the FDTD method
Authors: Zhao Ping‐Ya , Wu Chen , Litva John 
Published: July 2007

AbstractIn this short article we present a new fast finite‐difference timedomain (FDTD) method. Producing exactly the same solution to Maxwell's equations as Yee's classic FDTD method, the fast FDTD method offers up to a 50% reduction in the number of multiplications, which is a very important indicator of the computational complexity of an algorithm. Mathematical analysis and computer simulations are given in the article. © 1994 John Wiley & Sons, Inc.
Characteristics of a rectangular microstrip patch antenna with protecting spaced dielectric superstrate
Authors: Afzalzadeh Reza , Karekar R. N. 
Published: July 2007

AbstractA dielectric protecting superstate with spacing on the order of one wavelength from the rectangular microstrip patch antenna and of thickness up to about half a wavelength shows very small variation in resonance frequency (fr) and reflection coefficient (Γ). Effects of the same on radiation pattern (RP) includes drastic changes in beamwidths. By use of the spaced superstate the patch can be protected without the need to redesign parameters like frand Γ. © 1994 John Wiley & Sons, Inc.
Determination of excitation voltages of a slotted waveguide array
Authors: Narasimhan M. S. , Rao R. Sriharl , Jayakumar Immanuel 
Published: July 2007

AbstractA technique for determination of excitation voltages of a linear waveguide slotted array from its measured radiation pattern is described in this Letter. Only the measured far‐field amplitude pattern is used for calculating the slot excitation voltages using FFT algorithm. © 1994 John Wiley & Sons, Inc.
Harmonic and intermodulation performance of nonlinear optical directional couplers
Authors: Abuelma'attl Muhammad Taher 
Published: July 2007

AbstractA Fourier‐series model describing the input‐output characteristic of nonlinear optical directional couplers is presented. Using this model, closed‐form expressions are obtained for the harmonic and intermodulation performance of nonlinear optical directional couplers excited by multisinusoidal signals. © 1994 John Wiley & Sons, Inc.
PulsedI‐Vcharacterization and noise measurements for an accurate hbt large‐signal model
Authors: Dlenot Jean‐Marc , Plana Robert , Gayral Michel , Graffeull Jacques 
Published: July 2007

AbstractThe various model parameters involved in an HBT large‐signal model based on the Ebers‐Moll topology have been extracted from noise measurements, pulsed I‐V characterizations, and S‐parameter measurements. Using this model a good correlation has been established between the estimated and measured output power variations versus the input power of a GaAlAs/GaAs HBT. © 1994 John Wiley & Sons, Inc.
New architecture for selfrouting photonic ATM switching with self‐synchronization and optically processed control
Authors: Zhang Jian‐Guo 
Published: July 2007

AbstractA new architecture is presented to optically self‐route photonic ATM switching. Two wavelengths are used to carry clock‐data and address signals, respectively. This allows to independent processing of both signals at each switching mode; so the complexity of optical routing controllers is reduced while the reliability of address decoding is improved. © 1994 John Wiley & Sons, Inc.
Study of tunneling time in tunneling BI‐quantum‐well and resonant tuneling barrier structures
Authors: Sugiyama Yoshihiro , Inata Tsuguo , Tackeuchi Atsushi , Nakata Yoshiaki , Nakamura Satoshi , Muto Shunichi 
Published: July 2007

AbstractWe studied the electron tunneling time in tunneling bi‐quantum‐well and resonant tunneling burrier structures with a pump‐probe photo‐luminescence system using optical mixing. The tunneling time decreased as the temperature increased, which is attributed to electrons in an exciton state thermalizing into free electrons having a faster tunneling time. © 1994 John Wiley & Sons, Inc.
Theoretical and experimental studies of electric‐field‐induced refractive index change in quantum‐film, ‐wire, and ‐box structures
Authors: Ravikumar K. G. , Aizawa T. , Shimomura K. , Kikugawa T. , Asada M. , Aral S. , Suematsu Y. , Yamauchi R. 
Published: July 2007

AbstractIn this article we report theoretical as well as experimental studies of the electric‐field‐induced refractive index change in InGaAs/InP quantum‐well structures, viz., quantum‐film, quantum‐wire, and quantum‐box structures. The refractive index change, easily measured using a Mach‐Zehnder interferometer setup, was around 1%, 4%, and 7% in quantum film, quantum wire, and quantum box, respectively, in the longer‐wavelength region corresponding to the positive refractive index change peak. Moreover, we will discuss that the refractive index change dependency on the polarization of incident light in a quantum film can be controlled by introducing suitable tensile strain in it. It was found that for a well width of 11 nm, 0.3% tensile strain should be induced to obtain polarization‐independent refractive index change. © 1994 John Wiley & Sons, Inc.
Flip‐chip lnAlAs/lnGaAs superlattice avalanche photodiodes with back‐illuminated structures
Authors: Hanatani Shoichi , Nakamura Hitoshi , Tanaka Shigehisa , Ido Tatemi , Notsu Chiaki 
Published: July 2007

AbstractA transparent InAlAs/InGaAs superlattice (SL) multiplication layer at a wavelength of 1.55 μm was realized by using quantum‐size effect. Using this SL, flip‐chip separate absorption and multiplication InAlAs/InGaAs SL avalanche photodiodes with back‐illuminated structures were demonstrated. A dark current lower than 2 μA at a multiplication factor of 10, a large gain‐bandwidth product of 110 GHz, and a wide bandwidth of 12 GHz were obtained at the wavelength of 1.55 μM. © 1994 John Wiley & Sons. Inc.
Multiple‐quantum‐well optical modulators and their monolithic integration with DFB lasers for optical‐fiber communications (invited paper)
Authors: Wakita Koichi , Kotaka Isamu 
Published: July 2007

AbstractHigh‐speed, low‐driving‐voltage operation of multiple‐quantum‐well (MQW) external modulators based on the quantum‐confinement Stark effect (QCSE) operating at long wavelengths are reviewed. We discuss the design and characteristics of ultrafast intensity and phase MQW modulators that have been developed by our group and we compare them with those of other material systems and structures based on a defined figure of merit for external modulators. In addition, we discuss a new integrated light source that enables external modulation of an in‐plane DFB laser to reduce wavelength chirping and coupling loss with a laser and a modulator. Finally, we describe new applications for optical soliton pulse generation using the above intensity modulator. © 1994 John Wiley & Sons, Inc.
High‐speed modulation of GaAs/AlGaAs multiple‐quantum‐well (MQW) asymmetric Fabry‐Perot (ASFP) reflection modulator
Authors: Nawaz M. , Olsen Borgar T. , MaCilvaney K. 
Published: July 2007

AbstractWe report the high‐frequency performance of GaAs/AlGaAs multiple‐quantum‐well‐ (MQW‐) based asymmetric Fabry‐Perot (ASFP) reflection modulator. The measured frequency response bandwidth of the modulator was ∼600 MHz at an applied voltage of only 5 V at a wavelength of ∼854 nm. The differential contrast of the modulator was 4.0 at an applied voltage of 12.5 at a wavelength of 863 nm. © 1994 John Wiley & Sons, Inc.
High‐power 0.98‐μm strained‐layer quantum‐well lasers with InGaP cladding
Authors: Ijichi Tetsuro , Ohkubo Michio , Iketani Akira , Kikuta Toshio 
Published: July 2007

AbstractRecent progress on InGaAs/GaAs strained‐layer quantum‐well lasers using InGaP cladding are reported. The 0.98‐, 1.02‐, and 1.06‐μm polyimide buried ridge waveguide lasers fabricated by using selective chemical etching are applicable to high‐power use. Further, employing InGaAsP layers lattice matched to GaAs enables the realization of GRIN‐SCH lasers, which is expected to be a technique to improve the laser characteristics. © 1994 John Wiley & Sons, Inc.