# Electronics Letters

## Filter Results

Displaying Results 1 - 25 of 32
• ### Intrinsic manifestation of regular pulsations in time-averaged spectra of semiconductor lasers

Publication Year: 1984, Page(s):525 - 526
Cited by:  Papers (5)
| | PDF (356 KB)

Time-averaged spectra of pulsating semiconductor lasers are simulated by integrating the numerical solution of multi-mode rate equations. The results obtained show that the linewidth broadening of each longitudinal mode due to the dynamic wavelength shift is accompanied by a characteristic mode-splittingÂ¿ effect arising from the integration. View full abstract»

• ### Improvement of crystalline quality of the surface layer in buried implanted oxide structures by silicon implantation

Publication Year: 1984, Page(s):526 - 527
| | PDF (357 KB)

An improvement of the crystalline quality of the surface layer in buried implanted oxide structures in silicon has been achieved by silicon in implantation and subsequent 570Â°C anneal treatment. View full abstract»

• ### Refined method for measurement of small-signal alphas of thyristors

Publication Year: 1984, Page(s):527 - 528
| | PDF (333 KB)

The letter presents a refined method for accurate measurement of small-signal current gains (alphas) of thyristors. The measurement circuit developed incorporates an original elimination procedureÂ¿with a single tuning for the entire range of measurement frequenciesÂ¿of the spurious effect of the parasitic gate-anode capacitance Cga. View full abstract»

• ### Simplified optical fibre end-cleave angle measurement device

Publication Year: 1984, Page(s):528 - 530
| | PDF (448 KB)

A modified method of fibre end-cleave angle measurement is described and compared with alternative techniques. The device has no precision parts and has a resolution of better than 0.25 degrees of end angle. View full abstract»

• ### Nonabsorbing-mirror (NAM) CDH-LOC diode lasers

Publication Year: 1984, Page(s):530 - 532
Cited by:  Papers (9)
| | PDF (555 KB)

CDH-LOC lasers with lateral and transverse mode control in nonabsorbing mirror regions are realised by a single etch-and-regrowth cycle. The maximum achieved peak-pulsed output power (100 ns) and catastrophic-optical-damage (power-density) levels are 1.5 W and (20Â¿30) MW/cm2, respectively. A linear power density of 200 mW/Â¿m is reached at catastrophic damage. Fundamental-mode operation is obtain... View full abstract»

• ### Simplified high-performance dual-band feed comprising a dual-depth corrugated launcher and a conventional corrugated horn

Publication Year: 1984, Page(s):532 - 533
Cited by:  Papers (1)
| | PDF (475 KB)

The design of a corrugated feed is presented which has a simplified configuration in comparison to a feed with dual-depth corrugations over its full length. It exhibits excellent electrical performance which is compatible with the requirements for frequency reuse application in satellite communication antennas. The feed consists of a short dual-depth corrugated launcher and a conventional corrugat... View full abstract»

• ### Novel refractometer using a tapered optical fibre

Publication Year: 1984, Page(s):534 - 535
Cited by:  Papers (5)
| | PDF (274 KB)

Using multimode tapered optical fibre a novel fibre-optic refractometer has been proposed. It can measure refractive indices to a high degree of accuracy and requires very little amount of sample for measurements. It is shown that, in principle, this refractometer can be designed to measure any refractive index less than that of the core with a better sensitivity than that of the earlier reported ... View full abstract»

• ### Measurement of linewidth and FM-noise spectrum of 1.52 μm InGaAsP lasers

Publication Year: 1984, Page(s):535 - 536
Cited by:  Papers (3)
| | PDF (281 KB)

The linewidth of 1.52 μm InGaAsP lasers was measured as a function of the output power. The result shows that the linewidth is about 15 MHz when the output power is 1 mW. The FM-noise spectrum was also measured in the frequency range from 10 Hz to 100 MHz. The measured spectrum consists of the 1/f-noise and white-noise components. The linewidth calculated from the FM-noise spectrum is in g... View full abstract»

• ### Polysilicon base contact in I2L transistors

Publication Year: 1984, Page(s):536 - 538
| | PDF (428 KB)

The extrinsic base diode minority carrier distribution under poly in I2L transistors can be calculated (or computed) in terms of an effective surface recombination velocity Seff at the mono/poly silicon interface similar to the oxide and metal cases. An analytical expression for Seff as a function of polysilicon parameters is given and compared to numerical solutions. Calculated ring speeds show a... View full abstract»

Publication Year: 1984, Page(s):538 - 540
| | PDF (387 KB)

The greatest common factor (GCF) is extracted from multi-variable polynomials using an indirectÂ¿ method for computing generalised PadÃ©-type approximations of multivariable rational functions. The algorithm is computationally easy and conceptually very simple. An example is given to illustrate the method. View full abstract»

• ### Experimental investigation of a new spectrometer comprising a Josephson junction

Publication Year: 1984, Page(s):540 - 541
Cited by:  Papers (6)
| | PDF (283 KB)

It is experimentally shown that an Nb-Nb point contact Josephson junction can be used as a very sensitive spectrometer of good frequency resolution in the range of millimetre waves by applying an inverse Hilbert transform on a characteristic deformation of its I/V characteristic caused by the absorbed RF energy. View full abstract»

• ### Simple power control circuit

Publication Year: 1984, Page(s):541 - 543
| | PDF (358 KB)

A simple circuit that gives a linear relation between input DC control voltage and an average load voltage is described. This circuit depends on a simple vector difference circuit based on inverse sine evaluation. The load voltage is found to be independent of the supply line voltage and of frequency fluctuations. View full abstract»

• ### Characterisation of graded single-mode fibres by fundamental-mode spot size variation

Publication Year: 1984, Page(s):543 - 545
| | PDF (399 KB)

In the letter the accuracy of ESI parameters extracted from spectral spot size behaviour is examined. Different spot size definitions are considered and it is found that the equivalent cutoff wavelength, even for profiles far from a step, agrees reasonably with the mathematically defined cutoff wavelength. View full abstract»

• ### Comment: Noise-cancelling switched-capacitor (SC) filtering technique

Publication Year: 1984, Page(s):545 - 546
| | PDF (294 KB)

First Page of the Article
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• ### Reply: Noise-cancelling switched-capacitor (SC) filtering technique

Publication Year: 1984
Cited by:  Papers (1)
| | PDF (184 KB)

First Page of the Article
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• ### Integrated bipolar 4:1 time-division multiplexer for bit rates up to 3 Gbit/s

Publication Year: 1984, Page(s):546 - 548
Cited by:  Papers (6)
| | PDF (537 KB)

First Page of the Article
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• ### 7000 m deep sea trial of OS-280M optical-fibre submarine cable system

Publication Year: 1984, Page(s):548 - 549
Cited by:  Papers (1)
| | PDF (414 KB)

The letter reports the 7000 m deep sea trial of an experimental OS-280M optical-fibre submarine cable system, consisting of a 24 km optical cable and two monolithic IC submarine repeaters, which was successfully carried out in February 1984. View full abstract»

• ### High-speed and low-power GaAs DCFL divider

Publication Year: 1984, Page(s):549 - 550
Cited by:  Papers (5)
| | PDF (324 KB)

High-speed and low-power divide-by-252 or -256 circuit have been fabricated by using high-transconductance GaAs enhancement-mode MESFETs. This variable-modulus divider is able to operate up to a clock frequency of 3.7 GHz. The total power dissipation at the maximum frequency is 180 mW, and it is as low as 42 mW and 30 mW at 3 GHz and 2.5 GHz, respectively. View full abstract»

• ### Absorption loss in optical fibres due to hydrogen

Publication Year: 1984, Page(s):550 - 552
Cited by:  Papers (5)
| | PDF (397 KB)

It is shown that OD formation in optical fibres due to the deuterium molecule can become a barrier to OH formation in optical fibres exposed to hydrogen, although it cannot be a barrier to the absorption due to the hydrogen molecule in a fibre. The mechanism is discussed. View full abstract»

• ### High-sensitivity Hi-Lo germanium avalanche photodiode for 1.5 μm-wavelength optical communication

Publication Year: 1984, Page(s):552 - 553
Cited by:  Papers (3)
| | PDF (272 KB)

A high-sensitivity small-detectable-area Hi-Lo germanium avalanche photodiode (Ge APD) was developed for use in 1.55 μm wavelength optical communication systems. This device has Hi-Lo (p+nn-) impurity profile. Its detectable area is 30 μm in diameter for single-mode optical-fibre use. The minimum average received signal level obtained was -40.5 dBm (at 450 Mbi... View full abstract»

• ### Coupling strength and influence in cleaved-coupled-cavity lasers

Publication Year: 1984, Page(s):553 - 555
Cited by:  Papers (1)
| | PDF (472 KB)

The coupling between the segments of a C3 laser is calculated, and threshold plots for small gap perturbations are shown to differ substantially. Cases of strong, intermediate and weak coupling are compared. View full abstract»

• ### Mode attenuation at 1.39 μm in graded-index fibres

Publication Year: 1984, Page(s):555 - 556
| | PDF (276 KB)

The differential mode attenuation αm(λ) in the spectral region of OH absorption (1.2-1.6 μm) has been studied in SiO2/GeO2 core graded-index fibres. It was found that the mode attenuation due to OH absorption Km(λ) at 1.39 μm had its maximum in the fibre core centre. The comparison between the calculated and measured Km<... View full abstract»

• ### Model for optical density of films with grain clustering

Publication Year: 1984, Page(s):556 - 558
| | PDF (360 KB)

In photographic emulsions, grains have been reported to be clustered. A model for the observed optical density in the presence of grain clustering has been developed. View full abstract»

• ### Comments on the synthesis of dual offset reflector systems

Publication Year: 1984, Page(s):558 - 559
| | PDF (292 KB)

Comments are made about the theoretical significance of two approaches to the synthesis of dual offset reflector systems under geometrical optics assumptions. View full abstract»

• ### Low-threshold current density InGaAsP/InP injection lasers with three-layer-waveguide double heterostructure (jth≅0.5 kA/cm2 at 300 K)

Publication Year: 1984, Page(s):559 - 561
| | PDF (431 KB)

Double heterostructure InGaAsP/InP lasers with a three-layer waveguide (or 'separate-confinement' DH) have been prepared by the LPE method with a thin active layer. A decrease in threshold current density has been observed up to 512 A/cm2 in a four-sided cleaved diode at room temperature. CW operation of broad-area diodes is obtained in the pumping current range up to 2.5 A. Calculation... 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