# Electronics Letters

## Issue 25 • 10 Dec 1998

This issue contains several parts.Go to:  Part Supplement

## Filter Results

Displaying Results 1 - 25 of 59
• ### Second- and third-order dispersion compensation of picosecond pulses achieved by combining two nonlinearly chirped fibre Bragg gratings

Publication Year: 1998, Page(s):2422 - 2423
Cited by:  Papers (6)  |  Patents (3)
| | PDF (244 KB)

With a combination of nonlinearly chirped fibre Bragg gratings, second- and third-order dispersion compensation for 1.6 and 3.5 ps pulses transmitted over a 66 km long dispersion-shifted fibre around the zero-dispersion wavelength is demonstrated for the first time View full abstract»

• ### Polarisation mode dispersion compensation at 20 Gbit/s with fibre-based distributed equaliser

Publication Year: 1998, Page(s):2421 - 2422
Cited by:  Papers (18)  |  Patents (8)
| | PDF (276 KB)

Ideal equalisation of polarisation mode dispersion can be expected from an equaliser that mirrors the differential group delay profile of a transmission line. The authors have successfully operated a PMF-based 77 ps compensator at 20 Gbit/s View full abstract»

• ### Fully blind estimation of time delays and spatial signatures for cyclostationary signals

Publication Year: 1998, Page(s):2378 - 2380
| | PDF (348 KB)

A novel estimation of time delays and steering vectors is developed for cyclostationary signals, in the case when an array manifold and signal waveform are completely unknown. Simulation results show that the estimates are reliable View full abstract»

• ### Performance analysis of private mobile radio system with finite unbalanced traffic sources

Publication Year: 1998, Page(s):2382 - 2384
| | PDF (372 KB)

An exact formula is given for the probability distribution of a call delay in a private mobile radio (PMR) system serving a number of unbalanced groups of callers, i.e. groups offering different traffic loads, which generalises a recent result for balanced groups. This formula may help to dimension PMR systems View full abstract»

• ### Low-threshold AlGaN-GaN heterostructure field effect transistors for digital applications

Publication Year: 1998, Page(s):2367 - 2368
| | PDF (228 KB)

The fabrication of an AlGaN-GaN based digital inverter circuit is reported, in which a large gain (up to 180) and a noise margin of ~0.5V have been obtained. The measured temperature coefficient of the switching voltage of the inverter was ~3.5 mV/°C up to 90°C. The simulations predict that such an inverter should operate up to ~230°C View full abstract»

• ### Low-crosstalk WDM by Bragg diffraction from thermally fixed reflection holograms in lithium niobate

Publication Year: 1998, Page(s):2419 - 2421
Cited by:  Papers (1)  |  Patents (24)
| | PDF (412 KB)

Dense wavelength-division-multiplexing (WDM) systems require narrowband wavelength filters for simultaneous multiplexing/demultiplexing of several channels. As a proof of concept the authors report the demultiplexing of two channels (channel spacing 0.8 nm) by Bragg diffraction from two thermally fixed volume phase reflection holograms in photorefractive lithium niobate crystals doped with iron. M... View full abstract»

• ### Experimental validation of radiometric sensitivity in correlation radiometers

Publication Year: 1998, Page(s):2377 - 2378
Cited by:  Papers (1)
| | PDF (232 KB)

The prediction of the radiometric sensitivity of correlation radiometers based on the system parameters requires knowledge of the standard deviation of each measurement due to the finite integration time. Theoretical formulations have been experimentally validated showing the dependence of the standard deviation with the measurement and extended for arbitrary over sampling factors View full abstract»

• ### Multiple fibre gratings fabricated using frequency-doubled copper vapour lasers

Publication Year: 1998, Page(s):2407 - 2408
Cited by:  Papers (1)
| | PDF (236 KB)

The first use of a frequency-doubled copper vapour laser to write fibre Bragg gratings is described. The peak reflectivity of these gratings is comparable to that obtained using a CW frequency-doubled argon laser of similar average power. Average UV powers >2 W enabled multiple, essentially identical gratings to be written simultaneously View full abstract»

• ### Architecture for hardware implementation of programmable ternary de Bruijn sequence generators

Publication Year: 1998, Page(s):2389 - 2390
| | PDF (228 KB)

An architecture for direct hardware implementation of programmable ternary de Bruijn sequence generators is described. The approach employed is based on the use of two recently introduced ternary logic components: the J3K3 flip-flop sequencer and the hybrid implemented U-gate. Generation of de Bruijn sequences and the proposed implementation approach are described with the ai... View full abstract»

• ### Field trial at 40 Gbit/s over 28.6 and 86 km of standard singlemode fibre using quaternary dispersion supported transmission

Publication Year: 1998, Page(s):2425 - 2426
Cited by:  Papers (6)
| | PDF (240 KB)

40 Gbit/s transmission using a single optical carrier and electrical time division multiplexing is demonstrated for the first time reusing standard singlemode fibres from the existing fibre infrastructure of Portugal Telecom. Bit error measurements as well as video transmission via STMI interfaces demonstrate the robustness of dispersion supported transmission under real operating conditions View full abstract»

• ### Minimax approach to envelope constrained filter design

Publication Year: 1998, Page(s):2381 - 2382
Cited by:  Papers (10)
| | PDF (232 KB)

A novel approach to envelope constrained filter (ECF) design is proposed, based on modifications of minimax algorithms, originally developed for mismatched filter design for sidelobe suppression in radar applications. The proposed approach introduces error control in the nonfeasible solution case. Thereby allowing for an improved performance View full abstract»

• ### Stabilisation of actively modelocked Er-doped fibre laser by minimising interpulse noise power

Publication Year: 1998, Page(s):2410 - 2411
Cited by:  Papers (7)
| | PDF (264 KB)

A novel method is reported for stabilising an actively modelocked Er-doped fibre laser through minimisation of the average interpulse noise power. Long term stable operation of a harmonically actively modelocked fibre σ-laser is demonstrated using the proposed method View full abstract»

• ### Approaches to estimating terrain height and baseline for interferometric SAR

Publication Year: 1998, Page(s):2428 - 2429
Cited by:  Papers (2)  |  Patents (1)
| | PDF (268 KB)

A method for estimating the terrain height of interferometric synthetic aperture radar InSAR is proposed. Errors in height estimation due to the curvature of the Earth's surface are analysed and simulated. By using L-band SIR-C data for the Three-Gorge' area in China, the terrain height is obtained by employing the method. A method for estimating the parameters of the baseline is also presented. ... View full abstract»

• ### Moisture measurement in masonry walls using a non-invasive reflectometer

Publication Year: 1998, Page(s):2413 - 2414
Cited by:  Papers (7)
| | PDF (228 KB)

A new simple method is presented for determining the average moisture content in walls based on a time-domain reflectometer. Using such a microwave locating reflectometer, it is possible to perform non-invasive measurements in masonry with access from only one side. The spatial resolution of the reflectometer is improved by the use of a pole extraction algorithm. To obtain accurate results for the... View full abstract»

• ### Compatible cofactor multiplication for Diffie-Hellman primitives

Publication Year: 1998, Page(s):2396 - 2397
Cited by:  Papers (2)
| | PDF (312 KB)

Cofactor multiplication has recently been proposed as a technique for protecting Diffie-Hellman primitives against certain attacks. However, a Diffie-Hellman primitive protected with cofactor multiplication as initially described produces different keys when not under attack than its unprotected counterpart. A simple modification to cofactor multiplication is presented that overcomes this incompat... View full abstract»

• ### Small rectangular patch antenna

Publication Year: 1998, Page(s):2366 - 2367
Cited by:  Papers (30)
| | PDF (212 KB)

A novel folded rectangular patch antenna is designed and measured. Compared with a conventional patch antenna with the same surface area, the resonant frequency is reduced by 37%. The cross-polarisation level is ~-20 dB View full abstract»

• ### Broadband wireless infrared LAN architecture compatible with Ethernet protocol

Publication Year: 1998, Page(s):2371 - 2372
Cited by:  Papers (4)
| | PDF (284 KB)

A wireless infrared (IR) LAN for the indoor environment is proposed which is compatible with the familiar CSMA/CD protocol used in Ethernet. Eye safe 140 Mbit/s transmission at only 5 mW transmitter power in a 20 m2 cell is experimentally demonstrated View full abstract»

• ### MRF model based image segmentation using hierarchical distributed genetic algorithm

Publication Year: 1998, Page(s):2394 - 2395
Cited by:  Papers (6)
| | PDF (236 KB)

An unsupervised method for segmenting noisy and blurred images is proposed. A Markov random field (MRF) model is used which is robust to degradation. Since this is computationally intensive, a hierarchical distributed genetic algorithm (HDGA) is used which is unsupervised and parallel. Experimental results show that the proposed method is effective at segmenting real images View full abstract»

• ### Demonstration of highly scalable 100 Gbit/s OTDM computer interconnect with rapid interchannel switching capability

Publication Year: 1998, Page(s):2418 - 2419
Cited by:  Papers (6)  |  Patents (3)
| | PDF (288 KB)

An experimental demonstration of an error free 100 Gbit/s optical time division multiplexing (OTDM) broadcast star multiprocessor interconnect is presented. A highly scalable novel node design provides rapid interchannel switching capability of the order of the single channel bit period (1.6 ns) View full abstract»

• ### Design of optimal symmetric FIR receive filters

Publication Year: 1998, Page(s):2375 - 2377
| | PDF (340 KB)

A method for designing optimal symmetric odd-length finite impulse response digital receive filters is proposed. The filter jointly minimises the mean power of intersymbol interference and additive noise or interference under the constraint that the filter coefficients are symmetric. The method yields exactly symmetric filters with the same performance as the earlier unconstrained design but with ... View full abstract»

• ### Figure-of-eight Brillouin/erbium fibre lasers

Publication Year: 1998, Page(s):2406 - 2407
Cited by:  Papers (2)
| | PDF (240 KB)

Multiple wavelength lasing in an all-fibre figure-of-eight Brillouin/erbium fibre laser is presented. The simultaneous presence of a stimulated Brillouin scattering (SBS) pump and generated Stokes lines within a Sagnac loop mirror (SLM) initiated high order Stokes and anti-Stokes waves through the four-wave mixing (FWM) process View full abstract»

• ### User-defined spectral manipulation of HRTF for improved localisation in 3D sound systems

Publication Year: 1998, Page(s):2387 - 2389
Cited by:  Papers (6)
| | PDF (388 KB)

Front-back and elevation confusions typically occur when non-individualised HRTFs (head related transfer functions) are used in a 3D sound system. A practical strategy is proposed to allow more customisation' of the 3D sound system. Thus it envisioned that the performance of the basic 3D sound system would be enhanced with the flexibility of user-defined adjustments without the actual measurement... View full abstract»

• ### AuBe ohmic contacts to p-type ZnTe

Publication Year: 1998, Page(s):2434 - 2435
| | PDF (244 KB)

Ohmic contacts of AuBe to p-ZnTe show a minimum specific contact resistance of 3.0×10-6 Ω cm2 for a p-doping level of 1.6×1019 cm-3 and at an annealing temperature of 200°C. The beryllium is very effective at improving the electrical properties of p-type contacts to ZnTe View full abstract»

• ### Determination of lowest energy state in single-electron circuits

Publication Year: 1998, Page(s):2401 - 2403
Cited by:  Papers (3)
| | PDF (356 KB)

A method for determining the lowest energy state in single-electron circuits using a genetic algorithm is presented. The proposed method can effectively handle large single-electron circuits and does not require a priori knowledge of the initial circuit state View full abstract»

• ### Least squares pattern synthesis for conformal arrays

Publication Year: 1998, Page(s):2363 - 2365
Cited by:  Papers (6)
| | PDF (344 KB)

The problem of synthesising low sidelobe beams from conformal arrays consisting of few elements and large radius of curvature is addressed. Experimental results are presented for a 12 element array of linearly polarised elements forming a faceted array with radius of curvature 1.5 m. It is shown that by calculation of an aperture correcting matrix, sidelobe levels of 40 dB can be obtained from the... 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