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# Electronics Letters

## Filter Results

Displaying Results 1 - 25 of 36
• ### Intermodulation and harmonic distortion in InGaAsP lasers

Publication Year: 1985, Page(s):665 - 666
Cited by:  Papers (97)
| | PDF (278 KB)

A theoretical and experimental study is presented of intermodulation and harmonic distortion in high-speed 1.3 and 1.5 Â¿m InGaAsP lasers modulated at frequencies up to 8 GHz. It is found that all lasers measured, including Fabry-Perot and distributed feedback lasers, generate approximately the same distortion levels for a given modulation depth and relaxation resonance frequency. There are minor ... View full abstract»

• ### New orthogonal transform for digital signal processing

Publication Year: 1985, Page(s):666 - 667
Cited by:  Papers (3)
| | PDF (252 KB)

A new ortogonal transform is defined using the slant matrices and some of its properties are discussed; a fast algorithm is also derived. View full abstract»

• ### Performance of signals coded by miller code in the presence of noise and interference

Publication Year: 1985, Page(s):667 - 668
Cited by:  Papers (1)
| | PDF (269 KB)

In the letter the bit error probability for signals which are coded by the Miller code in the presence of Gaussian noise and interference is determined. The optimal area of the filter bandwidth, the best in accordance with the error probability, is determined. View full abstract»

• ### Dispersion penalties for single-mode-fibre transmission using 1.3 and 1.5 Â¿m LEDs

Publication Year: 1985, Page(s):668 - 670
Cited by:  Papers (4)
| | PDF (413 KB)

Dispersion penalties for single-mode-fibre transmission using 1.3 and 1.5 Â¿m LEDs have been measured for fibre lengths of up to 22.5 km and at bit rates of 90, 140 and 280 Mbit/s. The experimental results are compared to theoretical values obtained from an intersymbol interference calculation. View full abstract»

• ### New method to measure scattering and total losses of optical fibres

Publication Year: 1985, Page(s):670 - 671
| | PDF (313 KB)

The direct measurement of scattering and total losses of very good uniform optical fibres has been proposed and verified for the first time by analysing the scattering light with the variation of input launching power of an He-Ne laser by an optical attenuator. The scattered light has been detected by the cubic detector at different positions along the fibre. View full abstract»

• ### Tailored-gain broad-area semiconductor laser with single-lobed diffraction-limited far-field pattern

Publication Year: 1985, Page(s):671 - 673
Cited by:  Papers (9)
| | PDF (406 KB)

We demonstrate a 60 Â¿m-wide asymmetric tailored-gain broad-area semiconductor laser with a single-lobed diffraction-limited far-field pattern 2.5Â° wide. The method used to achieve gain tailoring may be used to create nearly arbitrary two-dimensional spatial gain distributions within a broad-area laser. View full abstract»

• ### Bandwidth and signal-data compression using maximum specified error as control

Publication Year: 1985, Page(s):673 - 674
| | PDF (290 KB)

A technique for bandwidth compression is described which is based on the principle of having an interpolation function between important pointsÂ¿ and ensuring that the maximum error between the original function and the interpolation function is closely approached but never exceeded. The maximum error controls the placing of the important pointsÂ¿. View full abstract»

• ### Theoretical investigation of a stripline planar antenna

Publication Year: 1985, Page(s):674 - 675
| | PDF (246 KB)

Numerical results of the aperture field, pattern and gain of a stripline planar antenna element are obtained by the moment method. The difficulty of singularities in the integral equation has been overcome by a simple shift of the testing functions. View full abstract»

• ### Method for the generation of M-ary constant-envelope PSK signals

Publication Year: 1985, Page(s):676 - 677
| | PDF (292 KB)

This method does not require the usual two carriers in quadrature (I and Q channels), nor does it require data prefiltering to smooth the phase transitions. The system described here acts as a `delay modulatorÂ¿ of a single carrier, resulting in a linear phase shift and absolutely constant envelope of the modulated signal. View full abstract»

• ### Effect of number of spectral terms on convergence of spectral-domain calculations of E-plane structures

Publication Year: 1985, Page(s):677 - 678
Cited by:  Papers (2)
| | PDF (287 KB)

The effect of the number of spectral terms on the accuracy of the spectral-domain analysis of E-plane circuits is studied. The ability of the solution to reconstruct the gap field is related to the error in propagation constant and characteristic impedance. View full abstract»

• ### System reduction by continued-fraction expansion about s=jÂ¿i

Publication Year: 1985, Page(s):678 - 680
Cited by:  Papers (8)
| | PDF (359 KB)

A method of system reduction using the continued fraction expansion about arbitrary points on the real frequency axis is proposed. It gives a good approximation and the procedure is suitable for digital computation. View full abstract»

• ### Model reduction by condensed continued-fraction method

Publication Year: 1985, Page(s):680 - 681
Cited by:  Papers (1)
| | PDF (292 KB)

It is shown how the continued-fraction method of Chen and Shieh may be used on part of the transfer function to produce reduced-order models when its normal application is unsatisfactory. In addition, the truncation method is shown to be related to this technique. View full abstract»

• ### Optimum monopulse linear array excitations using Zolotarev polynomials

Publication Year: 1985, Page(s):681 - 682
Cited by:  Papers (2)
| | PDF (290 KB)

The synthesis of linear arrays with optimum difference patterns is described. Element excitations are found using Zolotarev polynomials. View full abstract»

• ### Systolic encoder for fast waveform vector quantisation

Publication Year: 1985, Page(s):682 - 684
Cited by:  Papers (2)
| | PDF (373 KB)

The letter presents a systolic architecture that can efficiently perform the encoding operations of waveform vector quantisation using the squared-error distortion measure. In the system, squared-error cells and comparing cells are used to achieve modularity and concurrency. An index offset approach is employed for reducing I/O pins. View full abstract»

• ### 2Â¿18 GHz distributed amplifier in hybrid form

Publication Year: 1985, Page(s):684 - 685
Cited by:  Papers (1)
| | PDF (273 KB)

Practical results for a four-stage hybrid distributed amplifier built on 25.4 mm-square alumina substrate using Avantek AT10600 MESFETs are presented. The power gain is (4.5Â±1.5) dB from 2 to 18 GHz with input and output return loss of better than 10 dB. The noise figure across that band is better than 6.3 dB. View full abstract»

• ### Subharmonic modulation distortions in semiconductor lasers with optical feedback

Publication Year: 1985, Page(s):685 - 686
| | PDF (306 KB)

Experimental studies of subharmonic modulation distortions of semiconductor lasers with optical feedback are described. These distortions were found to exhibit almost resonant frequency characteristics and threshold behaviour against the modulation frequency and its depth, respectively. It was inferred that they would be excited by parametric interactions caused by some laser diode parameter chang... View full abstract»

• ### Improvement of InP MISFET characteristics using infra-red lamp annealing

Publication Year: 1985, Page(s):686 - 688
| | PDF (431 KB)

An infra-red lamp-annealing technique was employed for postannealing Si ion-implanted InP substrates. The effective electron mobility (Â¿eff) of SiO2-InP metal-insulator-semiconductor field-effect transistors fabricated using infrared lamp annealing is remarkably temperature-dependent. The maximum Â¿eff is Â¿ 11000 cm2/Vs at 75 K and 1500Â¿2500 cm2/Vs at room temperature. View full abstract»

• ### Fractal dimension of 1/fÂ¿ noises

Publication Year: 1985, Page(s):688 - 690
| | PDF (415 KB)

An extended reticular cell counting (ERCC) method is proposed to increase the accuracy in the determination of the fractal dimension of a signal as compared with the reticular cell counting (RCC) method. This new method (ERCC) is used to study the fractal dimension of noises with 1/fÂ¿ power spectrum. View full abstract»

• ### Inversion-mode InP MISFET using a photochemical phosphorus nitride gate insulator

Publication Year: 1985, Page(s):690 - 691
Cited by:  Papers (1)
| | PDF (295 KB)

An inversion-mode n-channel InP MISFET is fabricated using a photochemical phosphorus nitride film as a gate insulator. An effective electron mobility of ~1700 to 2200 cm2/Vs is obtained and the drain current maintains more than 80% of its initial value after 103 s at room temperature. These values are much superior to the characteristics of InP MISFETs using thermally deposited phosphorus nitride... View full abstract»

• ### Monitoring the final on-zone dynamics in TIL GTO thyristors

Publication Year: 1985, Page(s):691 - 693
Cited by:  Papers (1)
| | PDF (445 KB)

An original method that spotlights the increase of the final on-zone of the squeezed plasma with the level of anode current is described and implemented in the gated turn-off experimental investigation of TO-220-packaged, high-voltage TIL GTO thyristors. View full abstract»

• ### 100 ps waveguide multiple quantum well (MQW) optical modulator with 10:1 on/off ratio

Publication Year: 1985, Page(s):693 - 694
Cited by:  Papers (29)
| | PDF (372 KB)

By incorporating two quantum wells into a capillary waveguide, we have made the first MQW optical modulator with an on/off ratio of at least 10:1. Furthermore, this device was used to generate an optical pulse less than 100 ps long, the fastest to date with an MQW device. View full abstract»

• ### Acoustic resonator transducer for operation in air

Publication Year: 1985, Page(s):694 - 696
Cited by:  Papers (1)
| | PDF (481 KB)

An acoustic resonator and electronic system for operation in air are described. The transducer operates in a resonant mode and can be utilised to measure the distance between the transducer and a reflecting object. Experimental results are presented for a 275 kHz resonator transducer that can measure distances with better than 0.5 Â¿m resolution at a 0.6 mm range. Applications to noncontacting sur... View full abstract»

• ### FM noise suppression and linewidth reduction in an injection-locked semiconductor laser

Publication Year: 1985, Page(s):696 - 697
Cited by:  Papers (20)
| | PDF (277 KB)

An expression is derived for the FM noise spectrum of an injection-locked semiconductor laser. For increasing injection level the FM noise spectrum and the lineshape change gradually from those of the slave laser to those of the master laser. The ultimate linewidth reduction is obtained if the locking bandwidth is large enough to accommodate the frequency fluctuations and if the detuning is contro... View full abstract»

• ### Wavelength fluctuations in pulsed variable spacing phase-locked laser diode arrays

Publication Year: 1985, Page(s):697 - 699
| | PDF (442 KB)

Spectra taken for a pulsed variable spacing phase-locked laser diode array (VSA) were recorded and processed to determine the magnitude of wavelength fluctuations present in the diode's output field. Analysis revealed that a pulsed VSA emits primarily into a single longitudinal mode. View full abstract»

• ### Stereopsis with adaptive windows

Publication Year: 1985, Page(s):699 - 701
| | PDF (555 KB)

A scheme whereby window operators can be trained to detect the stereoscopic depth of objects in an image is described. Both a theoretical analysis of the behaviour of such windows and some practical results are presented. View full abstract»

## Aims & Scope

Electronics Letters is internationally renowned for its rapid communication of new developments and emerging topics across the broad and interdisciplinary field of modern electronics and electrical engineering.

Full Aims & Scope

## Meet Our Editors

Editors-in-Chief

Professor Chris Toumazou
Director of the Biomedical Institute
Imperial College, London, UK

Professor Ian White
Head of Photonics Research
University of Cambridge, UK