# Electronics Letters

## Filter Results

Displaying Results 1 - 25 of 69
• ### Self-starting passively modelocked fibre laser exploiting polarisation evolution in MQW waveguide

Publication Year: 1994, Page(s):1421 - 1422
Cited by:  Papers (1)
| |PDF (152 KB)

The authors give experimental evidence for a new type of modelocking mechanism in Er-doped fibre lasers, based on polarisation evolution in an intracavity MQW waveguide. Experiments indicate that anisotropic properties of MQW waveguides can continuously start the modelocking process View full abstract»

• ### Simple technique for measuring cavity loss in semiconductor lasers

Publication Year: 1994, Page(s):1422 - 1424
Cited by:  Papers (5)  |  Patents (18)
| |PDF (248 KB)

A new technique for measuring the cavity loss of semiconductor lasers is introduced. The cavity loss is deduced from the Fabry-Perot oscillations in the spontaneous emission well below the bandgap of the active region. This approach, referred to as the below-bandgap technique, is simple, applicable to both Fabry-Perot and DFB lasers, and is capable of measuring cavity losses with few restrictions ... View full abstract»

• ### Monolithically integrated polarisation diversity heterodyne receivers on GaInAsP/InP

Publication Year: 1994, Page(s):1446 - 1447
Cited by:  Papers (10)
| |PDF (192 KB)

Polarisation diversity heterodyne receiver OEICs including a tunable four-section DBR laser as a focal oscillator have been successfully fabricated for the first time. OEIC design and fabrication are described and first characteristics of the integrated subcomponents and a packaged receiver OEIC are presented View full abstract»

• ### Optical fibre electrets: observation of electro-acousto-optic transduction

Publication Year: 1994, Page(s):1436 - 1437
Cited by:  Papers (1)  |  Patents (3)
| |PDF (176 KB)

The authors report the first observation of strong electro-acoustooptic transduction in thermally poled optical fibre. Phase shifts at resonance as high as 1 rad have been obtained at applied fields of 0.5 V/μm View full abstract»

• ### Coupling structure for superconducting disk filters

Publication Year: 1994, Page(s):1424 - 1425
Cited by:  Papers (4)  |  Patents (5)
| |PDF (192 KB)

A new coupling structure for superconducting disk-filters that features a feeder extending into the neighbouring disk resonator is proposed. Simulation and experimental results demonstrate that the coupling structure reduces ripple in end-coupled disk filters View full abstract»

• ### Forward link power control for cellular CDMA networks. Comment & Reply

Publication Year: 1994, Page(s):1379 - 1380
| |PDF (160 KB)

M.M.Wang and O.K.Tonguz (see ibid., vol.29, pp.1195-1197, 1993) studied the power control issue with reference to the base-to-mobile link of a cellular CDMA system in the presence of fading. The performance of the system was given for various values of the power control law exponent, and for two different models for the traffic distribution, i.e. uniform and truncated bell. The authors comment on ... View full abstract»

• ### Planar lightwave circuit dispersion equaliser with a wide operational frequency range

Publication Year: 1994, Page(s):1404 - 1406
Cited by:  Papers (3)  |  Patents (2)
| |PDF (288 KB)

The authors report an integrated-optic dispersion equaliser with an amplitude flattening circuit on a planar lightwave circuit. The equaliser consists of six asymmetrical Mach-Zehnder interferometers cascaded in series. The operational frequency range of the equaliser is successfully extended from 12.6 to 21.2 GHz by amplitude flattening without deteriorating the delay characteristics View full abstract»

• ### Efficient technique for computing the RCS of curved surfaces at low grazing angles

Publication Year: 1994, Page(s):1447 - 1449
Cited by:  Papers (1)
| |PDF (232 KB)

The authors present a fast and efficient alternative technique for evaluating the PO integral at aspects where no stationary phase points exist, yielding a nonzero field for scattering at low grazing angles to a curved surface View full abstract»

• ### Loss distribution measurement of silica-based waveguides by using a jaggedness-free optical low coherence reflectometer

Publication Year: 1994, Page(s):1441 - 1443
Cited by:  Papers (6)  |  Patents (9)
| |PDF (272 KB)

The loss distributions in silica-based waveguides are successfully measured using a jaggedness-free optical reflectometer (OLCR). The OLCR reduces jagged fluctuations which appear in Rayleigh backscattering measurements undertaken with conventional OLCRs to within ±1 dB by averaging the wavelength-dependent Rayleigh backscatter signals. Constant loss distributions and a step-like loss incre... View full abstract»

• ### Multichannel FM-TV transmission using an engineered 1.3 μm praseodymium-doped fluoride fibre amplifier

Publication Year: 1994, Page(s):1431 - 1432
Cited by:  Papers (4)
| |PDF (184 KB)

The authors report the first use of a praseodymium-doped fluoride fibre amplifier (PDFFA) in a 24 TV channel FM-SCM transmission experiment. Twenty-four analogue FM-SCM-TV channels were amplified by a PDFFA without any observable degradation in picture quality. By using a single PDFFA as a post-amplifier, transmission over 104 km of standard' 1.3 μm optimised fibre was demonstrated with a tota... View full abstract»

• ### Robust learning algorithm for blind separation of signals

Publication Year: 1994, Page(s):1386 - 1387
Cited by:  Papers (55)  |  Patents (4)
| |PDF (184 KB)

The authors present a novel, efficient, self-normalising, unsupervised adaptive learning algorithm for the on-line (real-time) separation of statistically independent unknown source signals from a linear mixture of them. In contrast to the known algorithms the new algorithm allows the separation (or extraction) of extremely badly scaled signals (i.e. some or even all of the source and/or sensor si... View full abstract»

• ### Two-mode fibre spatial-mode converter using periodic core deformation

Publication Year: 1994, Page(s):1437 - 1438
Cited by:  Papers (10)  |  Patents (3)
| |PDF (176 KB)

Efficient conversion between the LP01 and LP11 modes in a two-mode fibre is achieved by periodically ablating the fibre surface with a CO2 laser and then annealing the fibre with an electric arc. The resulting periodic core deformation produces 99% mode conversion over a 37 nm bandwidth around 1540 nm and 0.38 dB insertion loss View full abstract»

• ### Circularly polarised dielectric resonator antenna

Publication Year: 1994, Page(s):1361 - 1362
Cited by:  Papers (32)  |  Patents (9)
| |PDF (180 KB)

A circularly polarised dielectric resonator antenna is reported. The circular polarisation is obtained by exciting the two orthogonal HE 11δ modes of a cylindrical ring dielectric resonator in phase-quadrature. Measured results show that the antenna has an axial ratio of less than 3 dB over a beam width of 100° with a minimum value of ~0.5 dB in this range View full abstract»

• ### Ordering of cascade FIR filter structures

Publication Year: 1994, Page(s):1393 - 1394
Cited by:  Papers (1)
| |PDF (168 KB)

A travelling salesman type genetic algorithm is used to optimise the order of low-order sections in cascade fixed-point FIR filters. Compared to a classical ordering algorithm, this more flexible approach gives improved frequency response for a fixed wordlength, and also highlights optimal wordlengths View full abstract»

• ### New TCM codes for 4PSK-2PSK modulation

Publication Year: 1994, Page(s):1383 - 1384
| |PDF (152 KB)

P.Szulakiewicz and R.Kotrys (see ibid., vol.30, no.13, pp.1032-1033) presented new 4PSK-2PSK multi-D trellis codes which allow a demodulator to lock onto the 2PSK signal set, achieving greater robustness to phase slips in a noisy environment. For the criteria used, i.e. maximum free squared Euclidean distance and minimum number of nearest neighbours, the authors suggest that their codes are not th... View full abstract»

• ### Spectral domain analysis of conductor losses in a multiconductor system via the incremental inductance rule

Publication Year: 1994, Page(s):1425 - 1427
Cited by:  Papers (2)
| |PDF (284 KB)

Spectral domain analysis is adapted to analyse the conductor losses of a multiconductor system embedded in a multilayered medium using a quasi-TEM approach and assuming a strong skin effect. After adapting the incremental rule to a multiconductor system, the conductor losses are computed in terms of the derivative of the inductance matrix View full abstract»

• ### Prediction of head proximity effect on antenna impedance using spherical wave expansions

Publication Year: 1994, Page(s):1365 - 1366
Cited by:  Papers (7)  |  Patents (1)
| |PDF (176 KB)

It is shown that, by approximating a human head as a dielectric sphere, the method of spherical wave expansions can be used to obtain useful predictions of the effect of the head on the impedance of an adjacent handset antenna working at ~2 GHz View full abstract»

• ### Logarithmic speed modular multiplication

Publication Year: 1994, Page(s):1397 - 1398
Cited by:  Papers (5)
| |PDF (192 KB)

A design for logarithmic speed modular multiplication is given and a quantitative comparison made with the best implementations of existing, more standard algorithms. A 40-fold increase in speed is reported using a chip area at the limit of current technology View full abstract»

• ### Results of 11.6 GHz radiometric experiment in Cameroon: second year

Publication Year: 1994, Page(s):1449 - 1450
Cited by:  Papers (1)
| |PDF (172 KB)

Three experiments were set up within a joint African radiometric propagation measurement program to provide data at frequencies above 10 GHz for predictive modelling. The authors report the results of the second year of measurements in Douala, Cameroon, along with mean results for the two years. These show significant departures from the ITU-R (formerly CCIR) rain climate and path attenuation mode... View full abstract»

• ### New technique for nonintrusive OTDR based on traffic data correlation

Publication Year: 1994, Page(s):1443 - 1444
Cited by:  Papers (1)  |  Patents (5)
| |PDF (172 KB)

The authors present a new technique for nonintrusive optical time-domain reflectometry. The correlation of the transmitted traffic data with the backscattered signal allows the power attenuation of the optical link to be measured. Hence, as no additional signal is used, there is no reduction of the channel capacity. The application of nonlinear signal processing to improve the performance is also ... View full abstract»

• ### Bend loss in buffered over-moded optical fibre: LP11 mode and whispering gallery' mode interaction

Publication Year: 1994, Page(s):1433 - 1434
Cited by:  Papers (3)
| |PDF (176 KB)

Bend loss in over-moded fibre has been measured as a function of temperature. For the LP11 mode, an oscillatory loss dependence on temperature was observed, caused by coupling between the LP11 mode and a `whispering gallery' mode. These interactions could have a significant effect on singlemode cutoff wavelength measurements View full abstract»

• ### Kink-like effect in long n-channel twin-gate fully-depleted SOI MOSFETs

Publication Year: 1994, Page(s):1456 - 1458
Cited by:  Patents (2)
| |PDF (232 KB)

Twin-gate structures consisting of the series combination of two short-channel SOI MOSFETs of different lengths with a common gate have previously demonstrated kink-free and very flat output characteristics. The authors observe and explain that when using long-channel fully-depleted twin-gates a kink-like effect reappears and seriously damages the output conductance View full abstract»

• ### Solving recurrence relations involving floor and ceiling functions

Publication Year: 1994, Page(s):1391 - 1393
| |PDF (196 KB)

A rounding lemma is presented which has applications in the field of discrete mathematics. The lemma can be used to simplify complex terms and analyse certain recurrence relations View full abstract»

• ### Compact quartzless optical quasi-circulator

Publication Year: 1994, Page(s):1438 - 1440
Cited by:  Papers (1)  |  Patents (5)
| |PDF (272 KB)

A compact quartzless structure is proposed for polarisation-insensitive optical quasi-circulators. Quartz is eliminated by using two different materials, YIG and GBIG in a Faraday rotator. The signs of their Faraday rotation coefficients are reversed. The length of the prototype is only half that of the conventional design for equally high isolation values View full abstract»

• ### Application of fuzzy controller to JPEG

Publication Year: 1994, Page(s):1375 - 1376
Cited by:  Papers (8)
| |PDF (148 KB)

An application of a fuzzy controller to JPEG for (grey-scale) image data compression is presented. The fuzzy controller conducts the search for a better compromise between compression ratio and image quality automatically in the JPEG model. Therefore, the fuzzy controller equipped JPEG is insensitive to the given initial quality. Simulations are performed on the image Lena and the results indicate... 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