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Online ISSN 1350-911X Print ISSN 0013-5194

Electronics Letters

Volume 26, Issue 8, 14 April 1990

Volumes & issues:

Volume 26, Issue 8

14 April 1990

High frequency gallium arsenide linearised transconductor for communications
Highly efficient integrated optical fibre amplifier module pumped by a 0.98 μm laser diode
459 km, 2.4 Gbit/s four wavelength multiplexing optical fibre transmission experiment using six Er-doped fibre amplifiers
Metallic glass ribbon probe for the measurement of the magnetic field, first and second order field gradients
Fast odd discrete cosine transform algorithms
Controlled amplifier modelocked Er3+ fibre ring laser
8 Gbit/s 202 km optical CPFSK transmission experiment using 1.3 μm zero dispersion fibre
Simple parameter estimation technique in manoeuvring target tracking system
Cache memory replacement policy for a uniprocessor system
  • Author(s): L. Colagiovanni  and  A. Shaout
  • Source: Electronics Letters, Volume 26, Issue 8, p. 509 –510
  • DOI:  10.1049/el:19900331
  • Type: Article
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  • p. 509 –510 (2)
    Cache memory hierarchies are used to buffer those portions of main memory with the most frequent use by the CPU. As cache memory is very costly, good design techniques must consider small cache sizes maintaining high levels of use (hit ratio) and ease of implementation. The memory replacement policy is important in maintaining a high hit ratio. Most replacement policies used are easily implemented when the main memory has fixed page locations. A new cache algorithm using a variable page configuration is explained in terms of program behaviour.
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2.2 GHz dual-detector lightwave receiver employing current shunt feedback amplifier design
Broadband operation of InGaAsP-InGaAs GRIN-SC-MQW BH amplifiers with 115 mW output power
Optical fibre microbending sensors by micromachining techniques
  • Author(s): J.H.C. Chao  and  G.W. Neudeck
  • Source: Electronics Letters, Volume 26, Issue 8, p. 513 –515
  • DOI:  10.1049/el:19900334
  • Type: Article
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  • p. 513 –515 (3)
    A practical tactile sensor using micromachined techniques has been implemented and evaluated. Optical fibres laid on the pedestals of micromachined silicon showed outstanding improvement in sensitivity, mechanical decoupling between fibres and excellent repeatability. The upper cover made from plastic and Cu–Be foils, not only provides a protective membrane to the sensor but also acts as the force concentrator, allowing better force point resolution.
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Ultra-high gain, low noise monolithic InP HEMT distributed amplifier from 5 to 40 GHz
High speed GaAs 32×8 embeddable dual port SRAM register array for 200 Mbyte/s packet switching applications
Boundary element method for modelling MIC devices
Self-routing planar network for guided-wave optical switching systems
  • Author(s): H. Obara ; S. Okamoto ; H. Uematsu ; H. Matsunaga
  • Source: Electronics Letters, Volume 26, Issue 8, p. 520 –521
  • DOI:  10.1049/el:19900338
  • Type: Article
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  • p. 520 –521 (2)
    An N × N self-routing planar network suitable for fabricating optical space switches on lithium niobate substrate is presented. The network has O(N2) cross points, good modularity and expandability. It also has no waveguide crossovers and no differential attenuation between any of the input and output pairs. A self-routing control can be applied to this network, which is indispensable for ATM switching systems.
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Perturbation feedback method for analysing rectangular dielectric waveguides
Wavelength combining fused-taper couplers with low sensitivity to polarisation for use with 1480 nm-pumped erbium-doped fibre amplifiers
Newly structured expandable 52-Mbit/s, 48-channel time-division switching LSI with 2.4 Gbit/s throughput
  • Author(s): N. Yamanaka ; S. Kikuchi ; H. Miyanaga
  • Source: Electronics Letters, Volume 26, Issue 8, p. 524 –526
  • DOI:  10.1049/el:19900341
  • Type: Article
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  • p. 524 –526 (3)
    An expandable Si bipolar 2.4 Gbit/s throughput, 52 Mbit/s 48-channel time-division switching LSI system is described. A high-throughput of 2.4 Gbit/s and a power-dissipation of 5.3 W are achieved by adopting a low-voltage swing four-serial-gated differential bipolar circuit design and super selfaligned process (SST-1A) logic-in-memory LSI technology. This LSI is applicable to the digital video time-division switching and digital crossconnect systems of future B-ISDN.
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Spectral analysis of waiting time jitter in the presence of stuff threshold modulation
  • Author(s): R.G. Kusyk ; T.E. Moore ; W.A. Krzymien
  • Source: Electronics Letters, Volume 26, Issue 8, p. 526 –528
  • DOI:  10.1049/el:19900342
  • Type: Article
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  • p. 526 –528 (3)
    The Fourier transform of waiting time jitter in the presence of stuff threshold modulation is derived. Comparisons are made between power spectral densities and RMS jitter obtained analytically and by simulation. The Fourier transform enables the jitter performance to be evaluated in the presence of alternative stuff threshold modulation waveforms, required for example, in some SONET applications.
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Unrepeatered 2.4 Gbit/s transmission experiment over 250 km of step-index fibre using erbium power amplifier
Comparison of a diffraction based radiowave propagation model with measurements
Broadband, high sensitivity erbium amplifier receiver for operation over wide wavelength range
Complementary Huffman sequences
  • Author(s): S.Z. Budišin
  • Source: Electronics Letters, Volume 26, Issue 8, p. 533 –534
  • DOI:  10.1049/el:19900346
  • Type: Article
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  • p. 533 –534 (2)
    The theories of complementary and Huffman sequences have been two distinct areas. It is shown that each Huffman sequence has its complementary pair. In radar applications, these pairs can be used, in the same way as other binary and nonbinary complementary sequences. They have the added advantage of zero autocorrelation sidelobes at all time shifts except the largest one. Even these sidelobes are cancelled if the autocorrelation functions are summed because of the complementarity.
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Multichannel video transmission over 100 km of step index singlemode fibre using a directly modulated 1537 nm distributed feedback laser
  • Author(s): P.A. Rosher  and  S.C. Fenning
  • Source: Electronics Letters, Volume 26, Issue 8, p. 534 –536
  • DOI:  10.1049/el:19900347
  • Type: Article
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  • p. 534 –536 (3)
    The operation of an analogue lightwave system through a dispersive fibre, using a directly modulated 1537 nm distributed feedback laser, is experimentally investigated. Dispersion is shown to result in carrier suppression and the generation of second order sum products. Using the appropriate control of the laser modulation depth, loss limited transmission of eight, broadcast quality, video channels was achieved over 100 km of step index singlemode fibre.
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Throughput performance of multistage interconnection networks in presence of multiple memory hot spots
Fast algorithm for real joint time–frequency transformations of time-varying signals
622 Mbit/s AMI FSK optical transmission experiment using a semiconductor optical preamplifier and a Fabry–Perot etalon demodulator
  • Author(s): R.C. Steele  and  G.R. Walker
  • Source: Electronics Letters, Volume 26, Issue 8, p. 539 –541
  • DOI:  10.1049/el:19900350
  • Type: Article
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  • p. 539 –541 (3)
    AMI encoding of FSK data was used at the transmitter of a 622 Mbit/s optical transmission system which used a Fabry-Perot etalon to demodulate the signal. An optical preamplifier was used prior to the etalon, giving a 6.2 dB improvement in sensitivity of −31.2 dBm at 10−9 BER. The amplifier also contributed noise which was not completely filtered out by the etalon. Improved amplifiers and higher resolution filters should make high sensitivity receivers in FDM network applications possible.
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Comment: Conjugate pair fast Fourier transform
Latch-up property and dynamic stability in sinusoidal oscillators
Wideband class AB (push–pull) current amplifier in CMOS technology
Medical ultrasound imaging using neural networks
  • Author(s): M. Nikoonahad  and  D.C. Liu
  • Source: Electronics Letters, Volume 26, Issue 8, p. 545 –546
  • DOI:  10.1049/el:19900354
  • Type: Article
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  • p. 545 –546 (2)
    A neural network can be trained to remove aberrations in the echo arrival time (delay noise) prior to beamforming in a medical ultrasound imaging system. Such abberations arise from the inhomogeneity in the velocity of sound in the intervening tissues and can severely degrade the image quality. Simulations for a 64-element, 3.5 MHz array coupled with a 64-input/output neural network demonstrate the improvements.
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Comment: Behaviour of circuit-switched multistage networks in presence of memory hot spot
Reply: Behaviour of circuit-switched multistage networks in presence of memory hot spot
High gain erbium fibre amplifier pumped by 800 nm band
  • Author(s): M. Nakazawa ; Y. Kimura ; K. Suzuki
  • Source: Electronics Letters, Volume 26, Issue 8, p. 548 –550
  • DOI:  10.1049/el:19900357
  • Type: Article
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  • p. 548 –550 (3)
    An optical gain as high as 30 dB is obtained at 1.5354 μm in an erbium fibre amplifier pumped in the 800 nm band. The pump power is 100 mW and the pump threshold is 27 mW. The erbium concentration is 34ppm and the fibre length is 100m. The maximum gain reaches 37.5 dB for a pump power of 200 mW. The pump source is a Ti: sapphire tunable laser. The most efficient pumping wavelength region is around 820 nm.
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Fast discrete Radon transform and 2-D discrete Fourier transform
5 Gbit/s, 250 km error-free soliton transmission with Er3+-doped fibre amplifiers and repeaters
  • Author(s): K. Suzuki ; M. Nakazawa ; E. Yamada ; Y. Kimura
  • Source: Electronics Letters, Volume 26, Issue 8, p. 551 –553
  • DOI:  10.1049/el:19900359
  • Type: Article
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  • p. 551 –553 (3)
    Error-free solition transmission at a bit rate of 5 Gbit/s over 250 km has been accomplished. The transform-limited soliton pulse source is a gain-switched DFB laser diode with a narrow-band spectral filter and Er amplifiers. A LiNbO3 light intensity modulator is used for pulse switching. A new ‘pre-emphasis technique’ for sending solitons over a longdistance is used, in which an Er3+-doped fibre amplifier is installed every 25 km as a lumped amplifier.
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3.4 GHz silicon bipolar versatile shift register and 6.8 Gbit/s word generator
Erratum: Proposed ultrahigh frequency microstrip utilising buried silicide groundplane
Erratum: Index profile of proton-exchanged waveguides in LiNbO3 using pyrophosphoric acid
Erratum: Optoelectronic switch with low holding power
Erratum: Amplification in the 1300 nm telecommunications window in a Nd-doped fluoride fibre

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