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# Electronics Letters

## Filter Results

Displaying Results 1 - 25 of 63
• ### 20 GHz subpicosecond monolithic modelocked laser diode

Publication Year: 2000, Page(s):454 - 456
Cited by:  Papers (6)
| | PDF (447 KB)

The authors have succeeded in generating subpicosecond (790 fs) optical pulse from a monolithic modelocked laser with an integrated extended cavity at a repetition rate of 20 GHz. Shortening of the pulse due to the reduction of the cavity loss was achieved by embedded a non-doped InP layer on the extended cavity. View full abstract»

• ### Fast computation of discrete W transform through discrete Hartley transform (DHT)

Publication Year: 2000, Page(s):474 - 476
| | PDF (367 KB)

A new algorithm is presented for the type-II, -III and -IV discrete W transforms which involves the simple conversion of a length-N discrete W transform into a length-N discrete Hartley transform. The total number of additional arithmetic operations introduced by the conversion is less than 5N. View full abstract»

• ### Throughput-enhanced parallel scheduling algorithm for MIQ switch with moderate number of queues

Publication Year: 2000, Page(s):477 - 478
| | PDF (279 KB)

A novel parallel scheduling algorithm known as the parallel solitary-request-first (PSRF) algorithm is proposed to improve the throughput performance of a multiple input-queued (MIQ) switch when the number of queues is less than the switch size. View full abstract»

• ### Enhanced-phase-shaped binary transmission

Publication Year: 2000, Page(s):478 - 480
Cited by:  Papers (11)  |  Patents (8)
| | PDF (413 KB)

A theoretical assessment of the performance of a new modulation format which is of interest for both submarine and terrestrial optical transmission is presented. It consist in increasing the extinction ratio of a standard phase-shape binary transmission (PSBT) signal in order to obtain a high tolerance to both chromatic dispersion and signal-to-noise ratio degradation. This enables the optical pow... View full abstract»

• ### Catastrophic damage and accelerated ageing in bent fibres caused by high optical powers

Publication Year: 2000, Page(s):414 - 416
Cited by:  Papers (13)  |  Patents (5)
| | PDF (344 KB)

Catastrophic optical fibre damage effects have been known about for some time, but this effect typically needs external initiation and therefore can be avoided in most instances. It is shown for the first time that catastrophic damage can occur in a fibre carrying high optical powers when it is bent quite tightly. In less severe bend situations, this may lead to degradation of the coating, which c... View full abstract»

• ### Application of Sagnac interferometer for measuring chromatic dispersion of installed single-mode fibres

Publication Year: 2000, Page(s):413 - 414
Cited by:  Papers (1)
| | PDF (236 KB)

A novel method is described which is suitable for measuring the chromatic dispersion of installed single-mode fibres by using a modified σ-type Sagnac interferometer, which contains an off-centred phase modulator. Chromatic dispersion is measured with high resolution from the output interference fringe without requiring any fast diagnostic equipment. Measurement of the chromatic dispersion o... View full abstract»

• ### 40 GHz actively modelocked polarisation maintaining erbium fibre ring laser

Publication Year: 2000, Page(s):411 - 413
Cited by:  Papers (21)
| | PDF (308 KB)

The first polarisation-maintaining actively modelocked erbium fibre ring laser (ML-EFRL) operating at a base rate of 40 GHz is presented. The laser generates highly stable and virtually transform-limited 1.2-1.9 ps pulses tunable over 40 nm with a timing jitter of <0.1 ps. These represent the shortest pulses and lowest timing jitter generated by a 40 GHz ML-EFRL View full abstract»

Publication Year: 2000, Page(s):399 - 400
| | PDF (212 KB)

A new algorithm is presented to (i) multiply two operands represented in hybrid notation, namely, one as a single vector and the other as two carry-save vectors of logic 1's and 0's, and (ii) to minimise and subsequently add the resulting sign extension bits concurrently with (i). The use of the proposed algorithm results in the complete elimination of the need for the separate adder modules nor... View full abstract»

• ### Over 1 W fibre-coupled power from single semiconductor source for pumping of Raman fibre amplifiers and erbium-doped fibre amplifiers

Publication Year: 2000, Page(s):410 - 411
Cited by:  Papers (2)
| | PDF (200 KB)

For the first time, over 1W of optical power has been coupled into single-mode fibre from a single semiconductor laser diode operating at 1.45 μm. This device meets the need for a compact high power source for pumping of erbium-doped fibre amplifiers and for Raman amplification in fibres View full abstract»

• ### Technique for developing averaged duty ratio model for DC-DC converters employing constant on-time control

Publication Year: 2000, Page(s):397 - 399
Cited by:  Papers (5)
| | PDF (304 KB)

The averaged duty ratio model for constant on-time control, developed using the conventional modelling technique, shows substantial discrepancies in predicting the large-signal transient behaviour of DC-DC converters. A new technique is proposed for developing an averaged duty ratio model for constant on-time control which overcomes the inaccuracy of the conventional modelling method View full abstract»

• ### Heating effects on crude oil of electromagnetic and ultrasonic waves

Publication Year: 2000, Page(s):408 - 410
| | PDF (320 KB)

Experimental results are presented into the heating effects on heavy oil of electromagnetic and ultrasonic waves, both singly and combined. The results show that the heating efficiency of electromagnetic waves is higher than that of ultrasonic waves and that the heating effect of the two types of wave combined is basically equivalent to the sum of the effects of each wave separately View full abstract»

• ### Temperature insensitive spectrally encoded optical multichannel system for simultaneous transmission of digital baseband and subcarrier signals

Publication Year: 2000, Page(s):451 - 453
Cited by:  Papers (2)
| | PDF (332 KB)

In an optical code division multiplexed system digital baseband and subcarrier signal have been simultaneously transmitted over the same fibre using spectrally encoded LEDs. Electrical frequency reuse for the subcarrier signal is demonstrated. The insensitivity of the optical multiplexing approach with respect to temperature variation of the transmitters is experimentally proven View full abstract»

• ### High performance microwave power GaN/AlGaN MODFETs grown by RF-assisted MBE

Publication Year: 2000, Page(s):468 - 469
Cited by:  Papers (28)  |  Patents (1)
| | PDF (244 KB)

High performance GaN/AlGaN MODFETs grown by MBE directly on SiC substrate have been successfully fabricated and characterised. The epitaxial layers of the device were grown by RF-assisted MBE. Excellent device uniformity, reproducibility and scalability were obtained. Maximum output density of 6.5 W/mm was obtained for a 0.1 mm device. On scaling to 1.0 mm gate-width, a total output power of 6.3 W... View full abstract»

• ### General nonlinear analysis of second-order oscillators

Publication Year: 2000, Page(s):396 - 397
Cited by:  Papers (1)
| | PDF (212 KB)

A general nonlinear analysis of second-order oscillators is presented. The oscillator equation is given in perturbation form, involving a small perturbation parameter, and its periodic solution derived, if any exists, which is calculated using an asymptotic method. Analytical relations between design constraints and circuit parameters are deduced and applied View full abstract»

• ### Single-electron OR gate

Publication Year: 2000, Page(s):407 - 408
Cited by:  Papers (9)
| | PDF (212 KB)

The design of a single-electron OR gate is presented. Bits of information are represented by the presence or absence of single electrons at a conducting island. The static operation and the stability of this gate are analysed using Monte Carlo simulation View full abstract»

• ### Analysis and modelling of rain fade durations at 97 GHz in 6.5 km urban link

Publication Year: 2000, Page(s):459 - 461
Cited by:  Papers (2)
| | PDF (320 KB)

The authors present a statistical analysis and discuss modelling of the duration of rain fades derived from data collected at 97 GHz using an experimental terrestrial line of sight link of 6.5 km which has been in operation since August 1998 across the city of Portsmouth. The presented results provide an insight into what can be expected at these frequencies if they are to be used for future urban... View full abstract»

• ### Reducing the optical power penalty for electronically dispersion compensated LED pulse transmission by using multi-bit shift decision feedback

Publication Year: 2000, Page(s):450 - 451
Cited by:  Papers (1)  |  Patents (7)
| | PDF (236 KB)

The large power penalties encountered in the linear electronic compensation of dispersion induced LED pulse distortion can be reduced by using an electron decision feedback equalisation scheme. It is shown that with multi-bit shift feedback the residual penalty is comparable to that achieved when using a dispersion compensation fibre View full abstract»

• ### Broadband lumped HBT amplifiers

Publication Year: 2000, Page(s):466 - 467
Cited by:  Papers (5)
| | PDF (200 KB)

The authors report the realisation of wideband amplifiers using AllnAs/GaInAs transferred-substrate heterojunction bipolar transistors (HBTs). The first amplifier is in the fτ doubler configuration with an input emitter follower while the second is a Darlington stage designed for high gain. The former had a low frequency gain of 8.2 dB and a 3 dB bandwidth of 80 GHz. While the latte... View full abstract»

• ### Area-efficient gain- and offset-compensated very-large-time-constant SC integrator

Publication Year: 2000, Page(s):394 - 396
Cited by:  Papers (1)
| | PDF (292 KB)

A novel gain- and offset-compensated (GOC) charge-differentiating (CD) SC integrator is presented. The resulting gain, phase and offset errors are considerably smaller than those of previously proposed non-GOC and GOC CD very-large-time-constant (VLT) integrators View full abstract»

• ### Optimal bit-level arithmetic optimisation for high-speed circuits

Publication Year: 2000, Page(s):405 - 407
Cited by:  Papers (5)
| | PDF (300 KB)

In terms of speed, the Wallace-tree compressor (i.e. bit-level carry-save addition array) is widely recognised as one of the most effective schemes for implementing arithmetic computations in VLSI design. However, the scheme has been applied only in a rather restrictive way, i.e. for implementing fast multipliers and for generating fixed structures without considering the characteristic of the inp... View full abstract»

• ### Co-ordinate transformations for antennas with reflectors

Publication Year: 2000, Page(s):458 - 459
| | PDF (228 KB)

The use of Piograms in performing co-ordinate transformations is briefly reviewed and the approach is extended to include RF systems with reflector type antennas View full abstract»

• ### PMD compensation in 10 Gbit/s NRZ field experiment using polarimetric error signal

Publication Year: 2000, Page(s):448 - 450
Cited by:  Papers (14)  |  Patents (13)
| | PDF (320 KB)

A technique for compensating for the polarisation mode dispersion of a 10 Gbit/s non-return to zero (NRZ) installed fibre link (45 km, 80 ps mean differential group delay): using a variable polarisation delay line and a set of polarisation controllers is presented. The variation of the output polarisation with frequency over the signal bandwidth was monitored using a frequency-resolving Stokes-pol... View full abstract»

• ### Adaptive array utilising improved spatial averaging technique

Publication Year: 2000, Page(s):471 - 472
| | PDF (208 KB)

A further development of spatial smoothing is proposed based on the spatial averaging of the covariance matrices obtained by the subarrays. The proposed averaging technique uses spatial smoothing with some weighting, i.e. it is assumed that each subarray has additional weights View full abstract»

• ### GSM mobile phone based automobile security system

Publication Year: 2000, Page(s):463 - 464
Cited by:  Patents (1)
| | PDF (260 KB)

A prototype of a novel automobile security system is described. Besides tracking the positions of the target, video and audio signals inside the automobile are also captured. The data are sent to the server through the GSM network for analysis. Experimental results show that the approach is feasible even for the low bandwidth of the GSM network View full abstract»

• ### Video signal transmission for IS-95 environment

Publication Year: 2000, Page(s):465 - 466
| | PDF (256 KB)

A novel compression scheme for video sequences that is robust to fading errors in a spread spectrum environment is presented. A 3D coder has been designed in which the sequence was decomposed into spatio-temporal sub-bands and encoded using vector quantisation. Channel simulation shows good image reconstruction with a PSNR of 27 dB under the worst-case channel conditions of 18 dB 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