# Electronics Letters

## Filter Results

Displaying Results 1 - 25 of 70
• ### New low-noise heterojunction transit-time device for millimetre wave

Publication Year: 1994, Page(s):1319 - 1320
| |PDF (180 KB)

A new two-terminal millimetre wave transit-time device is presented that can be used for power generation. Theoretical calculations predict good noise properties. DC measurements are in agreement with a theoretical model of current transport across the employed GaAs/GaAlAs heterojunction. A first realisation of the structure leads to several milliwatts of power output at 60 GHz under pulsed condit... View full abstract»

• ### Biquads and allpass functions in current mode wave active filters

Publication Year: 1994, Page(s):1265 - 1267
Cited by:  Papers (3)
| |PDF (216 KB)

The authors present two features new to the current mode wave active filter topology. Bandpass biquadratic filter blocks with quality factors lower than those of the overall transfer function may be used for bandpass filters. Allpass filters may be implemented using the building blocks used for conventional filter simulation View full abstract»

• ### Highly reliable 1.55 μm GaInAsP laser diodes buried with semi-insulating iron-doped InP

Publication Year: 1994, Page(s):1305 - 1306
Cited by:  Papers (15)  |  Patents (9)
| |PDF (136 KB)

Highly reliable 1.55 μm GaInAsP/InP laser diodes buried with semi-insulating iron-doped InP are presented that operate stably for more than 5000 h with a degradation ratio of less than 5×10-6 /h. The lifetime at 50°C is estimated to be more than 105 h View full abstract»

• ### Voltage controlled dielectric resonator oscillator using three-terminal MESFET varactor

Publication Year: 1994, Page(s):1320 - 1321
Cited by:  Papers (5)  |  Patents (3)
| |PDF (164 KB)

The MESFET can be used as a three-terminal MESFET varactor by employing gate depletion capacitance Cg. Using this concept, a new VCDRO (voltage controlled dielectric resonator oscillator) has been designed. The VCDRO produced 10.17 dBm output power at a frequency of 11.00 GHz and tuning bandwidth of 70.2 MHz. The advantage of using the MESFET as a three-terminal varactor is to let the M... View full abstract»

• ### Single-frequency Er3+-doped silica-based planar waveguide laser with integrated photo-imprinted Bragg reflectors

Publication Year: 1994, Page(s):1311 - 1312
Cited by:  Papers (17)  |  Patents (7)
| |PDF (180 KB)

Single-longitudinal-mode operation of Er3+-P2O5-codoped silica planar waveguide lasers which are equipped with integrated Bragg grating reflectors is demonstrated, with a polarised output of 340 μW at 1546 nm. The gratings are photo-imprinted using 193 nm light exposure through a phase mask in GeO2-free optical waveguides that have been sensitised by ... View full abstract»

• ### Class A/AB second-generation current conveyor with controlled current gain

Publication Year: 1994, Page(s):1267 - 1269
Cited by:  Papers (31)
| |PDF (228 KB)

A new second-generation current conveyor whose current transfer from X to Z is controlled by a current, is introduced. It functions in class A/AB and uses a mixed translinear loop and two complementary current mirrors with controlled gain. SPICE simulation results, are given. They underline the high potential of the circuit View full abstract»

• ### Low-noise and high-power real refractive index guided laser array

Publication Year: 1994, Page(s):1307 - 1308
Cited by:  Patents (2)
| |PDF (172 KB)

A new monolithically integrated low-noise (RIN⩽-135 dB/Hz) and high-power (⩾150 mW) GaAlAs laser array has been developed. The laser array consists of two real refractive index guided lasers with different stripe widths View full abstract»

• ### All-optical address recognition and self-routing in a 250 Gbit/s packet-switched network

Publication Year: 1994, Page(s):1322 - 1323
Cited by:  Papers (50)  |  Patents (7)
| |PDF (184 KB)

The authors report the first demonstration of all-optical address recognition and self-routing of photonic packets for the case where the packet bit period is only 4 ps, corresponding to a 0.25 Tbit/s bandwidth optical network. An ultrafast all-optical device, known as a terahertz optical asymmetric demultiplexer (TOAD), was used to read the address information encoded in a packet header, which in... View full abstract»

• ### Low SNR approximation to phase PDF for PSK signals

Publication Year: 1994, Page(s):1279 - 1280
Cited by:  Papers (2)
| |PDF (144 KB)

The authors show that for a low SNR the probability density function (PDF) of phase for multilevel PSK signals may be approximated as a mean term plus a number of sinusoid terms. A relationship between the SNR and the accuracy of the approximation is developed View full abstract»

• ### Wavelength tunable two-pad ridge waveguide distributed Bragg reflector InGaAs-GaAs quantum well lasers

Publication Year: 1994, Page(s):1313 - 1314
Cited by:  Papers (10)  |  Patents (3)
| |PDF (176 KB)

Carrier injection in the grating section is used to tune the emission wavelength of a single growth step, single frequency, ridge waveguide InGaAs/GaAs quantum well distributed Bragg reflector laser with two top contacts. Single longitudinal mode emission with over 30 dB of sidemode suppression is observed throughout a tuning range of 6 nm with 60 mA of injection current in the grating section. Th... View full abstract»

• ### Experimental demonstration of adaptive nulling using a mesh reflector antenna

Publication Year: 1994, Page(s):1259 - 1261
| |PDF (232 KB)

The authors report the first results experimentally demonstrating the ability of a reconfigurable mesh reflector to adaptively form a null in the sidelobe region of an arbitrarily shaped pattern, with no a priori knowledge of the angular location of the source of interference. Using a prototype mesh reflector antenna with additional hardware and software in a compact antenna test range (CATR), dee... View full abstract»

• ### Fast precision voltage rectifier

Publication Year: 1994, Page(s):1269 - 1270
Cited by:  Papers (3)
| |PDF (156 KB)

A fast precision rectifier based on a maximum circuit is presented. A new circuit technique results in a very sharp corner in the transfer characteristic. A prototype has been fabricated using a 2μm CMOS process. Experimental results confirm a small input/output error and low output distortion for frequencies up to 1 MHz View full abstract»

• ### Wideband chirp measurement technique for high bit rate sources

Publication Year: 1994, Page(s):1336 - 1338
Cited by:  Papers (54)  |  Patents (1)
| |PDF (220 KB)

A Mach Zehnder (MZ) interferometer has been used as an optical discriminator to measure the time-resolved frequency chirp of an optical source View full abstract»

• ### Figure-eight fibre laser with largely unbalanced central coupler

Publication Year: 1994, Page(s):1302 - 1303
Cited by:  Patents (4)
| |PDF (192 KB)

The authors describe the operation of a figure-eight fibre laser constructed with an asymmetrically located amplifier and a largely unbalanced central coupler. This laser experiences less loss and is more easily modelocked than figure-eight lasers constructed with balanced (50:50) central couplers View full abstract»

• ### Multiwavelength gain flatness assessment of fluoride-based fibre amplifiers using a circulating loop

Publication Year: 1994, Page(s):1308 - 1309
Cited by:  Papers (4)  |  Patents (1)
| |PDF (176 KB)

Using an 8 channel multiplex ranging over 28 nm and a circulating loop, the gain excursion and the signal-to-noise ratio discrepancies between channels were measured against the number of in-line fluoride-based fibre amplifiers. 27 nm 6 dB gain bandwidth was observed after six fluoride-based amplifiers View full abstract»

• ### Constrained crosstalk resistant adaptive noise canceller

Publication Year: 1994, Page(s):1276 - 1277
| |PDF (160 KB)

The performance of an adaptive noise canceller (ANC) is sensitive to the presence of signal crosstalk' in the reference channel. The authors propose a novel approach to crosstalk resistant adaptive noise cancellation, namely the constrained crosstalk resistant adaptive noise canceller (CCRANC). The theoretical analysis of the CCRANC along with the constrained algorithm is presented. The performan... View full abstract»

• ### Demonstration of WDM survivable unidirectional ring network using tunable channel dropping receivers

Publication Year: 1994, Page(s):1323 - 1324
Cited by:  Papers (3)  |  Patents (7)
| |PDF (176 KB)

An experimental optical WDM reconfigurable ring network is proposed. It is composed of three nodes incorporating tunable channel dropping receivers (TCDRs) and EDFAs. The reconfiguration and the protection of the ring are computer-controlled. The authors present first experimental results of a fully connected testbed demonstrator View full abstract»

• ### Experimental demonstration of 100 GHz dark soliton generation and propagation using a dispersion decreasing fibre

Publication Year: 1994, Page(s):1326 - 1327
Cited by:  Papers (7)
| |PDF (180 KB)

The authors report the first experimental demonstration of high-frequency dark soliton generation through nonlinear conversion of a high-intensity beat signal in a +GVD dispersion decreasing fibre. High quality, 1.6 ps dark soliton generation at 100 GHz is obtained. The quality of the pulses and the stability of the trains are demonstrated by propagation through a 2.2 km span of +GVD dispersion sh... View full abstract»

• ### Fibre-supported optical generation and delivery of 60 GHz signals

Publication Year: 1994, Page(s):1329 - 1330
Cited by:  Papers (41)  |  Patents (2)
| |PDF (164 KB)

A novel frequency quadrupling' technique for the optical generation and delivery via fibre of modulated 60 GHz band millimetre-wave signals is described. The technique requires only microwave frequency capability for the optical modulator and drive electronics, and these are readily available commercially. The frequency quadrupling technique is demonstrated experimentally with a high spectral pur... View full abstract»

• ### New predictive classified vector quantisation scheme for image compression

Publication Year: 1994, Page(s):1280 - 1282
Cited by:  Patents (1)
| |PDF (252 KB)

A new image coding method using predictive classified vector quantisation (PCVQ) is proposed. The image is first divided into different subsources using a two-stage classification method based on the optimum three-level block truncation coding technique. Each subsource is then vector quantised using different codebooks. Simulation results show that an improvement of about 2 to 6 dB in PSNR perform... View full abstract»

• ### Modular current-mode defuzzification circuit for fuzzy logic controllers

Publication Year: 1994, Page(s):1287 - 1288
Cited by:  Papers (19)
| |PDF (136 KB)

A CMOS current-mode defuzzification circuit is presented. Simulation results show that high speed, large dynamic range and high accuracy are obtained. This structure is regular and modular, so it can be easily expanded to meet the requirement of the cardinal number of the universe View full abstract»

• ### High-speed InGaAs on Si metal-semiconductor-metal photodetectors

Publication Year: 1994, Page(s):1348 - 1350
Cited by:  Papers (3)
| |PDF (260 KB)

High-speed long-wavelength metal-semiconductor-metal (MSM) photodetectors were fabricated on the Fe-doped InP/GaAs material system on Si. The detector layers were grown by MOCVD on exactly oriented Si(001) patterned with submicrometre pitch V-grooves. The devices show a fast impulse response (44 ps FWHM, 83 ps fall time) and a large bandwidth of 3.4 GHz for illumination with 1.31 μm light pulse... View full abstract»

• ### Coupling modes of a ring resonator side coupled to a microstrip line

Publication Year: 1994, Page(s):1314 - 1315
Cited by:  Papers (3)
| |PDF (180 KB)

Two distinct but very close resonant peaks of a ring resonator side coupled to microstrip line are experimentally found to be due to odd- and even-mode coupling. Introducing proper breaks in the ring maintained the resonance characteristic of one mode while shifting the other peak away from the region of interest View full abstract»

• ### Experimental investigations on a tapered ferrite rod antenna with magnetic phase control

Publication Year: 1994, Page(s):1261 - 1262
Cited by:  Papers (2)
| |PDF (148 KB)

Experimental investigations were performed on a tapered ferrite rod antenna at 20 GHz. By inserting a section of the rod into a solenoid, phase control was achieved by varying the applied DC solenoid current. Phase shifts of greater than 100°/λ0 were attained. The gain and radiation patterns did not change significantly with the applied bias. The return loss was somewhat more... View full abstract»

• ### Straight-line soliton data transmission at 20 Gbit/s beyond Gordon-Haus limit

Publication Year: 1994, Page(s):1331 - 1333
Cited by:  Papers (4)  |  Patents (1)
| |PDF (268 KB)

Soliton data signals at 20 Gbit/s have been successfully transmitted over 3000 km with the use of soliton control by synchronous modulation and optical filters. The installation of only one simple modulator makes it possible to extend the maximum transmission distance from 2300 km (without soliton control) to 3000 km which is clearly beyond the Gordon-Haus limit 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