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# Electronics Letters

## Filter Results

Displaying Results 1 - 25 of 30
• ### 400 Mbit/s transmission test using A 1.53 Â¿m DFB laser diode and 104 km single-mode fibre

Publication Year: 1982, Page(s):937 - 938
Cited by:  Papers (11)
| | PDF (714 KB)

Transmission characteristics for a 400 Mbit/s signal over a 104 km single-mode fibre are reported. A DFB laser diode is restricted to a single longitudinal mode at 1.53 Â¿m. No degradation is observed in the error-rate performance at a low loss and a finite dispersion wavelength. View full abstract»

• ### Asummability testing

Publication Year: 1982, Page(s):938 - 940
| | PDF (477 KB)

Sarje and Biswas have developed an algorithm for generating pairs of minterms forming a given 2-sum. In the letter this procedure has been generalised for obtaining k-summable k-tuples. This simple process for generating k-summable k-tuples basically requires generation of 2-summable pairs. Having obtained these k-tuples, it is a trivial matter to test k-asummability of switching functions. View full abstract»

• ### New explanation of NDÂ¿1 dependence of specific contact resistance for n-GaAs

Publication Year: 1982, Page(s):940 - 941
Cited by:  Papers (3)
| | PDF (231 KB)

A new model of the ohmic contact to n-GaAs is proposed. It assumes that the contact resistance is due to the n+/n-barrier between the contact region (n+) and the semiconductor bulk (n = ND) as long as the bulk concentration is smaller than the effective density of states. Then the contact resistance is inversely proportional to the dopant concentration. View full abstract»

• ### Glass-gel-coated single-mode-fibre coupler with programmable power splitting ratio

Publication Year: 1982, Page(s):941 - 942
| | PDF (275 KB)

The power splitting ratio of a glass-gel-coated coupler can be programmed over a large range by controlling the curing temperature of the glass gel. View full abstract»

• ### Raman amplification at 1.118 Â¿m in single-mode fibre and its limitation by Brillouin scattering

Publication Year: 1982, Page(s):942 - 943
Cited by:  Papers (5)
| | PDF (319 KB)

A forward Raman gain of 2.9 dB has been measured in a 1.1 km low-loss fibre using an LED at 1.118 Â¿m as a signal source and a CW Nd: YAG laser as a pump. Backward Brillouin scattering, which depletes the pump power towards the end of the fibre, is found to enhance the Raman gain at the front end. View full abstract»

• ### Submarine optical-fibre cable design considering low elongation under tension

Publication Year: 1982, Page(s):943 - 945
Cited by:  Papers (2)
| | PDF (440 KB)

Submarine optical-fibre cable design considering low elongation under tension is proposed. Submarine cable using aluminium pressure resistant pipe according to this design can decrease the cable elongation under laying and recovery, and can be used even in deep sea up to a depth of 5000 m. View full abstract»

• ### High-speed-response InGaAs/InP heterostructure avalanche photodiode with InGaAsP buffer layers

Publication Year: 1982, Page(s):945 - 946
Cited by:  Papers (22)
| | PDF (431 KB)

The optical response time of an InGaAs/InP heterostructure avalanche photodiode (HAPD) with InGaAsP buffer layers is reported. It is shown that the buffer layers play an important role in reduction of the pile-up effect and are considered to be effective in achieving high-speed InGaAs/InP HAPDs. View full abstract»

• ### K-bank FET doubling oscillator

Publication Year: 1982, Page(s):946 - 947
| | PDF (357 KB)

A doubling-mode FET MIC VCO is reported to operate over a frequency range of 19.5 GHz to 30.6 GHz by a 0Â¿16 V tuning input. View full abstract»

• ### Orientation-dependent time delays of the first higher-order mode in elliptical-core fibres

Publication Year: 1982, Page(s):947 - 949
| | PDF (1724 KB)

Time delays of the differently orientated LP11 modes in elliptical-core fibres have been measured in dependence on the wavelength. These measurements permit one to determine the orientation-dependent effective cutoff wavelengths. An empirical expression relating LP11-mode delay splitting due to slight ellipticity and LP01-mode chromatic dispersion is obtained. View full abstract»

• ### Application of transform techniques to digital line codes and data transmission

Publication Year: 1982, Page(s):949 - 950
Cited by:  Papers (1)
| | PDF (349 KB)

A method for processing digital signals prior to transmission through the use of transforms is described. This provides means for control of the signal spectrum, for improving immunity to interference, and for including adaptive equalisation. View full abstract»

• ### Fault coverage of pattern-sensitive fault-detection algorithms for semiconductor memories

Publication Year: 1982, Page(s):950 - 951
| | PDF (332 KB)

Experimental studies have been made on the fault coverage of pattern-sensitive fault-detection algorithms proposed for semiconductor memories. The experiment is carried out on a microprocessor-based system. A comparative study has been made based on the experimental results. View full abstract»

• ### 50 km, two-repeaters sea trial of optical-fibre submarine cable system

Publication Year: 1982, Page(s):952 - 953
Cited by:  Papers (4)
| | PDF (225 KB)

The experimental optical-fibre submarine cable system with 50 km cable and two repeaters was successfully laid in early June 1982. Optical loss changes of the cable during laying were less than 0.003 dB/km. The experiment will be continued during two or three years to obtain data on the cable and the repeaters. View full abstract»

• ### Double-channel planar buried-heterostructure laser diode with effective current confinement

Publication Year: 1982, Page(s):953 - 954
Cited by:  Papers (12)
| | PDF (264 KB)

An InGaAsP double-channel planar buried-heterostructure laser diode has been developed in which a p-n-p-n current confinement structure effectively reduces the leakage current. High-power operation over 50 mW and high-temperature operation up to 130Â°C have been attained. View full abstract»

• ### SAW attenuation measurement in the acoustic microscope

Publication Year: 1982, Page(s):955 - 956
Cited by:  Papers (3)
| | PDF (290 KB)

A direct method for measuring surface-acoustic-wave attenuation using the scanning acoustic microscope is presented. The use of an annular lens excludes the longitudinal wave component from a normal V(z) measurement, and so an interference-free measurement of surface-wave attenuation alone is possible. Simple corrections compensate for both absorption in the coupling fluid as well as variations in... View full abstract»

• ### Calculation of coupling of two grooves in a parallel-plate guide

Publication Year: 1982, Page(s):956 - 958
Cited by:  Papers (1)
| | PDF (367 KB)

An analysis of the coupling properties of uniformly coupled groove guides is presented using an exact method for the determination of the phase constants of fundamental TE even and odd modes. View full abstract»

• ### Periodic multielement strip gratings

Publication Year: 1982, Page(s):958 - 959
Cited by:  Papers (2)
| | PDF (267 KB)

A method of analysis for strip gratings with more than one conducting strip per period is given. The method is then applied to a periodic twin-strip grating with two unequal gaps. The scattering parameters are found from a set of linear equations which may be solved numerically. View full abstract»

• ### OTDR in single-mode fibre at 1.55 Â¿m using a semiconductor laser and PINFET receiver

Publication Year: 1982, Page(s):959 - 961
Cited by:  Papers (5)
| | PDF (738 KB)

Optical time domain reflectometry (OTDR) at a wavelength of 1.55 Â¿m using a semiconductor laser source is reported for the first time. The apparatus uses a PINFET optical receiver and can detect the Rayleigh scatter signal over 30 km of single-mode fibre installed in duct. View full abstract»

• ### Optimal real-time interpolation for D/A conversion of sparsely sampled signals

Publication Year: 1982, Page(s):961 - 962
Cited by:  Papers (1)
| | PDF (257 KB)

Interpolative cubic splines are considered for real-time D/A conversion applications. Four methods are examined that evaluate the derivatives at the end-points of the interval. The performance evaluation of these methods is based on both a mean-square-error criterion and a figure of merit which considers hardware complexity. View full abstract»

• ### Fabrication of single-polarisation single-mode-fibre couplers

Publication Year: 1982, Page(s):962 - 964
Cited by:  Papers (10)
| | PDF (455 KB)

Fused biconical taper fibre couplers have been fabricated from single-polarisation single-mode fibres. A CVD technique is applied to permit maintenance of parallel alignment of the fibres in the coupler fabrication process. The couplers can hold linear polarisation along the principal axis of the fibre branches, showing an extinction ratio of about Â¿15dB. View full abstract»

• ### Effect of semiconductor laser phase noise on BER performance in an optical DPSK heterodyne-type experiment

Publication Year: 1982, Page(s):964 - 965
Cited by:  Papers (15)
| | PDF (390 KB)

We report the first experimental investigation of the effect of laser-diode phase noise on the error-rate performance in a PSK heterodyne differential detection fibre communication experiment. A newly designed AlGaAs laser emitter with adjustable linewidth is used as both the signal carrier and the local oscillator. Error rate is measured for 25 Mbit/s and 50 Mbit/s signals at an intermediate freq... View full abstract»

• ### Strays-insensitive switched-capacitor network realisation for nth-order voltage transfer functions

Publication Year: 1982, Page(s):966 - 967
| | PDF (250 KB)

A general synthesis method is given for the realisation of nth-order voltage transfer functions in the z-domain by active SC (switched-capacitor) networks using only biphased switches, capacitors and ideal operational amplifiers. The method presented is based on signal-flow graphs and the resulting networks are completely insensitive to stray capacitances. View full abstract»

• ### Miniature solid-state directional laser Doppler velocimeter

Publication Year: 1982, Page(s):967 - 969
| | PDF (424 KB)

A miniature laser Doppler velocimeter (LDV) using a single-mode solid-state semiconductor laser is described. Current-induced output frequency modulation of the laser output, combined with an unbalanced interferometer, is used to provide direction sensing. View full abstract»

• ### Electrical and acoustical crosstalk in integrated optical strip waveguide devices

Publication Year: 1982, Page(s):969 - 970
Cited by:  Papers (2)
| | PDF (295 KB)

Observations of electrically and acoustically induced crosstalk in LiNbO3 waveguide phase modulators at Â¿ = 0.633 Â¿m are reported. In the tested device, crosstalk attenuation was as low as 23 dB at 700 MHz and 29 dB at 22.83 MHz, which is caused by RF electromagnetic field coupling and by acoustical coupling, respectively, Crosstalk measurements are made as a function of frequency in the electri... View full abstract»

• ### Modified current mirror with a voltage-followingÂ¿ capability

Publication Year: 1982, Page(s):970 - 972
Cited by:  Papers (2)
| | PDF (393 KB)

A negative current mirror suitable for monolithic IC fabrication is described. It is unusual in that it is a voltage-followingÂ¿ circuit in which the input-output offset voltage is small and only weakly dependent on operating conditions. A base-current compensation scheme enables the circuit to exhibit a current transfer ratio comparable with that of the `WilsonÂ¿ current mirror. View full abstract»

• ### New optical monitoring method for arc-fusion splice of single-mode fibres and high-precision estimation of splice loss

Publication Year: 1982, Page(s):972 - 973
Cited by:  Papers (6)
| | PDF (277 KB)

A new local monitoring system with a 1.5 Â¿m LD is proposed, utilising fibre bending just behind the splice. By the use of index-matching fluid completely evaporated by arc-discharge, splice loss and strength of splice point are not degraded, and, furthermore, the splice loss can be estimated with a precision of Â± 0.01 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