# Electronics Letters

## Filter Results

Displaying Results 1 - 25 of 32
• ### Lasing characteristics of improved GaInAsP/InP surface emitting injection lasers

Publication Year: 1983, Page(s):457 - 458
Cited by:  Papers (7)
| |PDF (281 KB)

The letter presents a surface-emitting GaInAsP/InP injection laser with 7 Â¿m cavity length operating at 1.30 Â¿m of wavelength. The threshold was as low as 50 mA at 77 K. The device operated up to 140 K with one single longitudinal mode and small wavelength change (0.64 Ã/degree). The near-field diameter was 9 Â¿m and the far-field angle (FWHM) was 9Â°. The polarisation was linear. View full abstract»

• ### 1.3 Â¿m/1.5 Â¿m bidirectional WDM optical-fibre transmission system experiment at 144 Mbit/s

Publication Year: 1983, Page(s):458 - 459
Cited by:  Papers (2)
| |PDF (303 KB)

Results are reported of a 1.3 Â¿m/1.5 Â¿m bidirectional WDM transmission system experiment operating at 144 Mbit/s over 58 km of cabled single-mode fibre. Regenerators used Bell Laboratories-developed 1.3 and 1.5 Â¿m InGaAsP semiconductor lasers, InGaAs PIN diodes, microwave monolithic amplifiers and optical bidirectional couplers. View full abstract»

• ### InP MIS transistors with grown-in sulphur dielectric

Publication Year: 1983, Page(s):459 - 461
Cited by:  Papers (1)
| |PDF (401 KB)

We report the first experimental results on accumulation layer InP MISFETs where the gate dielectric is grown into the substrate by chemical reaction with sulphur. These MIS structures have very little hysteresis and very high transistor transconductances. View full abstract»

• ### Novel design of travelling-wave FET

Publication Year: 1983, Page(s):461 - 463
Cited by:  Papers (8)
| |PDF (483 KB)

In the letter we propose a novel travelling-wave FET, in which an additional image gate is placed beside the drain of the FET as a phase velocity synchroniser. Small-signal analysis is given in the light of coupled wave theory and shows that the device is capable of high gain and wide bandwidth amplification. The easy adjustment of phase synchronisation and compability of the conventional FET fabr... View full abstract»

• ### Ultra-long-range OTDR in single-mode fibres at 1.3 Â¿m

Publication Year: 1983, Page(s):463 - 464
Cited by:  Papers (6)
| |PDF (349 KB)

A single-mode optical time-domain reflectometer (OTDR) operating at a wavelength of 1.3 Â¿m with a dynamic range in excess of 26 dB one way is reported. The equipment incorporates a semiconductor laser source and a new low-noise optical receiver design utilising a PIN diode detector and a transimpedance amplifier. View full abstract»

• ### Localisation of defects on SOI films via selective recrystallisation using halogen lamps

Publication Year: 1983, Page(s):464 - 466
| |PDF (706 KB)

Selective annealing by means of an incoherent light system has been employed to grow single-crystal Si on oxide. This technique allows control of the location of the remaining defects (subgrain boundaries) in the <100> recrystallised film. View full abstract»

• ### SAW convolvers using the transverse-horizontal bilinear field

Publication Year: 1983, Page(s):466 - 467
Cited by:  Papers (2)
| |PDF (320 KB)

Conventional SAW convolvers rely on the transverse-vertical polarisation field induced by crystal nonlinearity in the presence of two contraflow input waves. The letter presents results for single-track SAW convolvers fabricated on LiNbO3 using the transverse-horizontal (in-plane) electric polarisation. The new electrode arrangement involved reduces the possibility of unwanted 'fold-over convoluti... View full abstract»

• ### Theoretical model for calculating rain-induced crosspolarisation

Publication Year: 1983, Page(s):467 - 469
| |PDF (387 KB)

A mathematical model for calculating rain-induced depolarisation on microwave links is described. It is carried out by using a Gaussian distribution of canting angle and use both mean and standard deviation of each drop-size canting angle. View full abstract»

• ### Detection of DC and low-frequency AC magnetic fields using an all single-mode fibre magnetometer

Publication Year: 1983, Page(s):469 - 471
Cited by:  Papers (2)
| |PDF (416 KB)

A technique for the determination of weak DC and low-frequency AC magnetic fields using a single-mode-fibre magnetometer is described. The technique utilises the dependence between the AC responsitivity and bias field to detect small changes in the bias field. Detection sensitivities in the milli-gauss/metre region have been obtained using a bulk nickel magnetostrictive element with microgauss sen... View full abstract»

• ### All-fibre michelsonÂ¿ thermometer

Publication Year: 1983, Page(s):471 - 473
Cited by:  Papers (8)
| |PDF (424 KB)

An all single-mode-fibre MichelsonÂ¿ temperature sensor is described utilising a signal recovery scheme based on laser frequency ramping with digital phase tracking. A sensitivity of 320 rad Â°CÂ¿1 mÂ¿1 was obtained when a steel probe was used as the sensing element. View full abstract»

• ### TDEG in In0.53Ga0.47As-InP heterojunction grown by chloride VPE

Publication Year: 1983, Page(s):473 - 474
Cited by:  Papers (3)
| |PDF (312 KB)

We report the first successful growth of selectively doped In0.53Ga0.47As-InP hcterojunctions by the chloride vapour phase epitaxy, and the observation of TDEG with a maximum electron mobility of 106 000 cm2 VÂ¿1 sÂ¿1 at 4.2 K. View full abstract»

• ### Contacts between amorphous metals and semiconductors

Publication Year: 1983, Page(s):474 - 476
| |PDF (479 KB)

The letter describes the relative enhancement of the thermal stability of Schottky barriers on both silicon and gallium arsenide that can be achieved using thin films of amorphous Ni-Nb and Ta-Ir alloy, the latter alloy being among the most stable fabricated to date, with less than 5% degradation of the barrier height after 2.5 h at 500Â°C. View full abstract»

• ### Systolic processor for computing the Wigner distribution

Publication Year: 1983, Page(s):476 - 477
Cited by:  Papers (3)
| |PDF (208 KB)

The letter presents a systolic architecture for computing the two-dimensional Wigner distribution. The system is based on exploiting a characterising array for the data and cordic cells to achieve structural modularity and parallelism. View full abstract»

• ### Equivalence between sinusoidal roll-off and trapezoidal response functions

Publication Year: 1983, Page(s):477 - 479
| |PDF (332 KB)

The equivalence between sinusoidal roll-off and trapezoidal response functions has been analysed in both frequency and time domains. A constant c = 0.76 is found for the minimax equivalence and a simple relationship between the two functions has been given. View full abstract»

• ### Ultrafast GaAs microwave PIN diode

Publication Year: 1983, Page(s):479 - 480
Cited by:  Papers (4)
| |PDF (298 KB)

This letter describes what is believed to be the first successful realisation of GaAs PIN diodes. The vertical structure was grown on an n+ substrate by MOCVD of a 2 Â¿m, 1015 cmÂ¿3 unintentionally doped nÂ¿ layer followed by a 0.3 Â¿m, 4Ã1019 cmÂ¿3 Zn doped p+ layer. The isolation and insertion loss of a single shunt-mounted device are typically Â¿27 dB and 0.7 dB, respectively. The switching sp... View full abstract»

• ### Microwave-frequency response of an optical-fibre delay-line filter

Publication Year: 1983, Page(s):480 - 481
Cited by:  Papers (8)
| |PDF (366 KB)

The frequency response of a single-mode fibre recirculating delay-line filter has been measured from 0 to 18 GHz using a broadband measurement system that includes an inteferometric waveguide modulator and a high-speed photodetector. An optical-fibre notch filter having a fundamental passband at 740 MHz exhibited 23 overtones that were uniform to within Â±1.5 dB over the entire measurement range. View full abstract»

• ### Aging test of MOCVD shallow proton stripe GaInAsP/InP, DH laser diode emitting at 1.5 Â¿m

Publication Year: 1983, Page(s):481 - 483
Cited by:  Papers (2)
| |PDF (503 KB)

We report on the aging of a continuous-wave (CW) GaInAsP/InP double-heterostructure laser emitting at 1.5 Â¿m, grown for the first time by MOCVD. This device has been operated at room temperature for more than 104 h without significant degradation. View full abstract»

• ### Regrowth of amorphous layers in silicon-on-insulator structures formed by the implantation of oxygen

Publication Year: 1983, Page(s):483 - 485
| |PDF (399 KB)

Synthesised silicon-on-insulator structures have been formed and implanted with 1Ã1016 As+ cmÂ¿2 at 40 keV. The regrowth kinetics of the amorphised layer, which also contains lattice defects and excess oxygen, has been studied by Rutherford backscattering. The regrowth of the layer occurs at a mean rate of 13 Ã minÂ¿1 at 500Â°C with an activation energy of 2.7Â±0.2 eV. This experiment further de... View full abstract»

• ### Joint characteristics between polarisation-maintaining single-mode fibres

Publication Year: 1983, Page(s):485 - 486
| |PDF (255 KB)

The jointing characteristics of polarisation-maintaining single-mode (PMSM) fibres are described. The power coupling loss and extinction ratio due to angular misalignment of the main principal axis at the fibre joint are measured. View full abstract»

• ### Quantisation effects in second-order wave digital filters

Publication Year: 1983, Page(s):487 - 488
| |PDF (225 KB)

A novel quantisation strategy is found for the second-order wave digital filter proposed by Verkroost so that the filter possesses near-optimal noise performance and only exhibits very low amplitude limit cycles under constant input conditions. View full abstract»

• ### Stable single-longitudinal-mode operation under high-speed direct modulation in cleaved-coupled-cavity GaInAsP semiconductor lasers

Publication Year: 1983, Page(s):488 - 490
Cited by:  Papers (12)
| |PDF (446 KB)

We describe a new self-aligned coupled-cavity laser formed by a simple variation of the usual cleaving procedures. Such cleaved-coupled-cavity (CCC or C3) lasers were highly single-longitudinal-moded with spectral and stability as good as those obtained from frequency-selective feedback lasers such as distributed feedback and distributed Bragg reflector lasers under high-speed direct modulation. View full abstract»

• ### Application of sine transform in image processing

Publication Year: 1983, Page(s):490 - 491
| |PDF (279 KB)

The sine transform has frequently been suggested as an alternative to the more commonly used Walsh-Hadamard and discrete cosine transforms for the purpose of image coding. It is demonstrated here that there are fundamental theoretical drawbacks to the transform which result in poor performance when it is employed in a practical coding situation. View full abstract»

• ### Microwave signal generation with injection-locked laser diodes

Publication Year: 1983, Page(s):491 - 493
Cited by:  Papers (121)
| |PDF (444 KB)

Heterodyne detection of the light from two slave lasers injection locked to FM sidebands of a modulated master laser is used to generate a narrowband microwave signal at 10.5 GHz. View full abstract»

• ### Electronic frequency tuning of TRAPATT oscillators

Publication Year: 1983, Page(s):493 - 495
| |PDF (492 KB)

Experimental results of a novel electronically tunable microstrip Trapatt oscillator employing varactor diodes arc presented. A tuning range of 20 MHz, limited by the low voltage breakdown of the varactor diodes and the number of tuning stages used, for an oscillator with a centre frequency of 1.6 GHz and an output power of 9 W, was observed and found to be in good agreement with theory. View full abstract»

• ### SC integrator for high-frequency applications

Publication Year: 1983, Page(s):495 - 496
Cited by:  Papers (2)
| |PDF (266 KB)

The time discrete integrator is a basic building block for a wide range of SC networks. Owing to the finite bandwidth of the amplifier, most of these networks are limited to applications in the audio frequency range. To overcome this restriction, a simple modification of the integrator circuit is presented, which allows the realisation of integrator-based SC networks at frequencies much higher tha... 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