By Topic

# Electronics Letters

## Filter Results

Displaying Results 1 - 25 of 37
• ### Optical DPSK heterodyne detection experiments using DBR laser diodes with external optical feedback

Publication Year: 1985, Page(s):1121 - 1122
Cited by:  Papers (6)
| | PDF (279 KB)

High receiver sensitivity, with 7 dB improvement over a direct detection system, has been achieved in a 400 Mbit/s optical DPSK heterodyne detection experiment using DBR laser diodes with external optical feedback. The influence of the laser output phase noise was evaluated experimentally in good agreement with theory. View full abstract»

• ### Automatic timing alignment for regenerative repeaters

Publication Year: 1985, Page(s):1122 - 1123
Cited by:  Papers (3)
| | PDF (284 KB)

A novel circuit technique that provides automatic timing alighnment of digital regenerative repeaters is described. The scheme employs correlation feedback to maintain the correct clock and data phase relationship. Theoretical and practical results are presented. View full abstract»

• ### High-rate fabrication of wholly synthesised fibre preforms by the multiflame VAD method using SiHCI3 raw materials

Publication Year: 1985, Page(s):1123 - 1124
Cited by:  Papers (3)
| | PDF (315 KB)

High-rate fabrication techniques for wholly synthesised graded-index fibre preforms were developed. An overall deposition rate of 5.6 g/min was attained using a multiflame VAD burner and using SiHCl3. A low loss of 0.25 dB/km at 1.59 Â¿m and a small eccentricity of less than 0.4% were obtained. View full abstract»

• ### GaAlAs/GaAs heterojunction bipolar phototransistors grown by LPE with a current gain of 50 000

Publication Year: 1985, Page(s):1124 - 1126
Cited by:  Papers (2)
| | PDF (493 KB)

A simple mesa GaAlAs/GaAs heterojunction bipolar phototransistor fabricated by LPE growth technique is presented. A high current gain of the order of 50 000 has been obtained and is believed to be the highest ever reported for a bipolar device. The corresponding high sensitivity is about 15 000 A/W for an 800 nm illumination wavelength. View full abstract»

• ### Floating integrator technique for switched-capacitor circuits employing reset cycles

Publication Year: 1985, Page(s):1126 - 1128
| | PDF (412 KB)

A simple floatingÂ¿ integrator technique is presented that is applicable to both single-ended and differential switched-capacitor circuits which employ reset cycles. This method is useful in eliminating the effects of any input offset or interstage differential or common-mode offsets in DC-coupled circuits. A monolithic circuit is demonstrated which uses this technique to achieve accurate differe... View full abstract»

• ### Choice of PRF for error-tolerant range destaggering of radar targets

Publication Year: 1985, Page(s):1128 - 1129
| | PDF (308 KB)

High and medium PRF radars perform ranging by means of multiple PRFs chosen according to the Chinese remainder theorem. Unfortunately this theory does not cope with errors in range measurements. A new rule for the choice of the PRFs is proposed which is tolerant of a prescribed error amplitude in range measurements. View full abstract»

• ### Linewidth of 1.3μm cleaved-coupled-cavity lasers

Publication Year: 1985, Page(s):1129 - 1131
| | PDF (429 KB)

The linewidth and side-mode suppression ratio of three variable-gap C3 lasers were measured as a function of output power and drive currents. With feedback carefully eliminated, the narrowest linewidth obtained was 8 MHz at an output power of 13.6 mW. There was little correlation between line-width and suppression ratio. View full abstract»

• ### Fabrication of long single-mode and multimode fluoride glass fibres by the double-crucible technique

Publication Year: 1985, Page(s):1131 - 1132
Cited by:  Papers (1)
| | PDF (352 KB)

Long single-mode and multimode fluoride glass fibres with core-clad structure are fabricated for the first time by the double-crucible technique. 500 m-long single-mode fibre and 700 m-long multimode fibre are obtained using ZrF4-BaF2-NaF-LaF3-AlF3 core and ZrF4-BaF2-NaF-LaF3-AlF3-HfF4 clad glasses. View full abstract»

• ### Meteor burst polarisation trials

Publication Year: 1985, Page(s):1132 - 1133
Cited by:  Papers (1)
| | PDF (355 KB)

Measurements over an 850 km path show that radio waves reflected by ionised meteor trails are typically received with the same polarisation as they were transmitted. Furthermore, a vertically polarised wave seems to suffer a 3Â¿4 dB larger loss than a horizontally polarised one. View full abstract»

• ### Mutual interaction between solitons of unequal amplitudes in optical fibre

Publication Year: 1985, Page(s):1133 - 1134
Cited by:  Papers (10)
| | PDF (334 KB)

An exact solution to the mutual interaction of two solitons propagating in a nonlinear single-mode fibre is given. From this, it is shown that the soliton separation can be effectively maintained by allowing the solitons to have unequal amplitudes. This provides a simple way to maintain the high bandwidth of a nonlinear fibre. View full abstract»

• ### The SINFET: a new high conductance, high switching speed MOS-gated transistor

Publication Year: 1985, Page(s):1134 - 1136
Cited by:  Papers (6)
| | PDF (522 KB)

A new MOS power semiconductor device with a very low on-resistance and a switching speed comparable to conventional n-channel power MOSFETs is described. The fabrication process is similar to that of an n-channel lateral DMOS transistor but with the conventional high-low ohmicÂ¿ drain contact replaced by a Schottky contact. In operation, the Schottky contact injects minority carriers to conductiv... View full abstract»

• ### Dark noise of Ga0.47 In0.53As photoconductive detectors

Publication Year: 1985, Page(s):1136 - 1138
| | PDF (492 KB)

We have studied the dark noise of planar, interdigitated Ga0.47In0.53As photoconductive detectors by measuring the statistical distribution of the dark current under DC bias. The measurements reveal two interesting results: (i) the probability distribution of the dark current around its DC level is Gaussian and (ii) the standard deviation of the probability distribution grows exponentially with in... View full abstract»

• ### Molecular-beam-epitaxy-grown single-longitudinal-mode GaAs-AlGaAs interferometric lasers on stepped-channelled substrates

Publication Year: 1985, Page(s):1138 - 1140
| | PDF (356 KB)

The GaAs-AlGaAs double-heterostructure interferometric lasers were successfully grown by molecular beam epitaxy on [011]-oriented-stepped-channelled GaAs(100) substrates. These lasers have a side-mode suppression ratio of greater than 200:1. View full abstract»

• ### Detection of fixed targets embedded in log-normal clutter

Publication Year: 1985, Page(s):1140 - 1141
| | PDF (288 KB)

Measurements of radar clutter using high-resolution systems show that clutter echoes cannot be modelled as Gaussian-distributed. A log-normal distribution is assumed and single-pulse detection performances are evaluated according to the Marcum-Swerling approach as well as the signal losses with respect to the Gaussian case. View full abstract»

• ### Measurements of crosspolarisation and gain reduction due to dust on a microwave reflector antenna

Publication Year: 1985, Page(s):1141 - 1143
Cited by:  Papers (1)
| | PDF (448 KB)

9 GHz measurements of effects of dust accretion on the surface of a reflector antenna confirm an earlier prediction of a larger gain reduction when the dust layer covers half the area. Crosspolarisation levels were higher than expected theoretically. Deposits on the primary feed also cause high crosspolarisation. View full abstract»

• ### Analysis of reduced chirping of semiconductor lasers for improved single-mode-fibre transmission capacity

Publication Year: 1985, Page(s):1143 - 1145
Cited by:  Papers (3)
| | PDF (425 KB)

It is shown that direct modulation of semiconductor lasers yielding optical pulses with an exponential shape corresponds to a nearly chirp-free operation. With such pulses the maximum transmission capacity at Â¿ = 1.55 Â¿m is about 55 Gbit/s Â¿km for a nondispersion-shifted single-mode fibre. View full abstract»

• ### Low-OH-content fibre fabrication using particle-size control sol-gel method

Publication Year: 1985, Page(s):1145 - 1146
| | PDF (272 KB)

By the sol-gel method using a new `particle-size controlÂ¿ technique, a low-OH content at a level of 0.1 parts in 106 and a minimum optical loss of 1.8 dB/km at 1.6 Â¿m wavelength has been achieved in pure silica core single-mode optical fibres. Improvement of dry gel properties using particle-size control is essential to bubble-free fibre drawing form dehydrated gel-derived glasses. View full abstract»

• ### Linewidth reduction of cleaved-coupled-cavity lasers by optical feedback from a single-mode polarisation-preserving fibre external cavity

Publication Year: 1985, Page(s):1146 - 1148
Cited by:  Papers (1)
| | PDF (430 KB)

Linewidth characteristics of a cleaved-coupled-cavity laser with a single-mode polarisation-preserving fibre external cavity have been investigated as a function of feedback power level and side-mode suppression ratio. The optimum power feedback ratio is near 2Ã10Â¿4 for a minimum linewidth of about 30 kHz. A weak dependence of linewidth on side-mode suppression ratio is observed as long as the s... View full abstract»

• ### Automatic threshold-level control (ATC) for optimum decision operation in optical repeaters

Publication Year: 1985, Page(s):1148 - 1149
| | PDF (308 KB)

An automatic threshold-level control (ATC) method for optimum decision operation in an optical repeater is studied using in-service error monitoring in the line code with the bit-inversion rule. Results of an experiment with a 110 Mbit/s optical repeater and a 10B1C line coder clarify that the ATC method is effective for maintaining the optimum decision threshold level. View full abstract»

• ### Measurement of wavelength variation of mode field radius using far-field pattern method

Publication Year: 1985, Page(s):1149 - 1151
Cited by:  Papers (2)
| | PDF (426 KB)

The far-field pattern measuring technique is used to measure the wavelength dependence of the mode field radius in standard single-mode fibres. Chromatic dispersion calculated from these results is shown to be accurate using as few as three lasers. Both theoretical and experimental results are presented. View full abstract»

• ### Dependence of single-longitudinal-mode probability on DFB laser facet structure

Publication Year: 1985, Page(s):1151 - 1152
Cited by:  Papers (6)
| | PDF (277 KB)

The probability of single-longitudinal-mode (SLM) operation is calculated for three kinds of DFB facet structures. To obtain high SLM probability, a DFB laser with cleaved facets requires relatively large kL, but the introduction of asymmetry to facet reflectivity greatly relaxes the kL requirements. View full abstract»

• ### Varactor diode for tuning high-power solid-state microwave oscillators

Publication Year: 1985, Page(s):1152 - 1153
| | PDF (257 KB)

A novel varactor diode has been developed for tuning high-power microwave solid-state oscillators. The resulting output power against frequency remains much flatter than conventional high-power varactor-tuned oscillators. View full abstract»

• ### Double-resonance technique for C/V measurements of semiconductor devices

Publication Year: 1985, Page(s):1153 - 1154
| | PDF (269 KB)

A double-resonance technique has been developed for measuring the capacitance/voltage characteristics of junction semiconductor devices. It can be used in regions of forward bias where currently used methods are often unreliable. View full abstract»

• ### High reliability of 1.5 μm two-step VPE-LPE-grown DC-PBH lasers

Publication Year: 1985, Page(s):1154 - 1156
Cited by:  Papers (1)
| | PDF (389 KB)

The reliability of 1.5 μm InGaAsP/InP DC-PBH lasers prepared by two-step hydride VPE and LPE was estimated at the 70°C, 5 mW constant-power mode. The low degradation rate (8Ã10-5/h) indicated high reliability of the two-step VPE-LPE-grown LDs with the VPE-grown active layer. View full abstract»

• ### Switched-capacitor integrators with low finite-gain sensitivity

Publication Year: 1985, Page(s):1156 - 1157
Cited by:  Papers (42)
| | PDF (357 KB)

Compensated SC integrator stages are analysed and compared with respect to their sensitivities to finite amplifier gain effects. Simple single-stage amplifiers may be used in such circuits even in highly selective filtering applications. This may allow an extension of the present frequency range of SC circuits. 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