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Electronics Letters

Issue 21 • Date 12 Oct 1995

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Displaying Results 1 - 25 of 60
  • 40 Gbit/s all-optical demultiplexing using a monolithically integrated Mach-Zehnder interferometer with semiconductor laser amplifiers

    Publication Year: 1995, Page(s):1857 - 1858
    Cited by:  Papers (14)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (180 KB)

    The authors demonstrate all-optical error-free demultiplexing of 10, 20 and 40 Gbit/s to 5 Gbit/s data signals by using a monolithically integrated Mach-Zehnder interferometer with two semiconductor laser amplifiers View full abstract»

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  • 980 nm diode pumped erbium3+/ytterbium3+ doped Q-switched fibre laser

    Publication Year: 1995, Page(s):1836 - 1837
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (168 KB)

    The latest results obtained with an acousto-optically Q-switched erbium3+/ytterbium3- diode pumped fibre laser are reported. The use of Er:Yb enables short high power pulses to be obtained. Pulse durations of 15 ns and peak powers >50 W have been achieved at a 500 Hz repetition rate View full abstract»

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  • Cryptanalysis of the blind signatures based on the discrete logarithm problem

    Publication Year: 1995
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (88 KB)

    In a recent paper (see L. Harn, ibid., vol.31, no.14, pp.1136, 1995), Harn claims that certain signature schemes are not true blind signatures. In this comment we prove that this claim is incorrect. Harn's attempt to cryptanalyse the schemes is incorrect, since the proposed relationship, which is used to trace the signature by the signer, is an invariant that is satisfied by any two pairs of signe... View full abstract»

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  • Dynamic characteristics of a 1.3 μm laser diode integrated with a spot-size converter coupled to a silica planar lightwave circuit

    Publication Year: 1995, Page(s):1858 - 1860
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (228 KB)

    Dynamic characteristics are clarified for a laser diode integrated with a spot-size converter coupled to a silica planar lightwave circuit. The laser was developed with a butt-jointed selectively grown spot-size converter. A maximum coupling efficiency of -0.74 dB was achieved. Bit error rate performances are estimated to clarify the allowable reflection when optical feedback from the fibre output... View full abstract»

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  • Analogue CMOS continuous-time tapped delay-line circuit

    Publication Year: 1995, Page(s):1793 - 1794
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (220 KB)

    A microelectronic 20-stage tapped delay line consisting of cascaded lowpass filter amplifier stages has been demonstrated. The delay per tap is ~2.7 ns, and different versions have been optimised for pulsed and narrowband operation in the 30-70 MHz frequency range. Potential applications are in radar and adaptive antenna systems View full abstract»

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  • High power narrow beam single mode ARROW-type InGaAs/InGaAsP/InGaP diode lasers

    Publication Year: 1995, Page(s):1837 - 1838
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (168 KB)

    The authors have obtained, from 20 μm aperture 0.98 μm wavelength three-core ARROW-type InGaAs/InGaAsP/InGaP diode lasers, a diffraction-limited beam pattern up to 0.55 W peak-pulsed power with 78% of the light in the central lobe and near diffraction-limited-beam operation to 0.7 W. Interelement optical absorption loss is found to be important for improved beam quality at high drive levels,... View full abstract»

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  • Extending the Hastad attack to LUC

    Publication Year: 1995, Page(s):1827 - 1828
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (172 KB)

    The authors show that the attack of Hastad on broadcast messages using the RSA cryptosystem extends to the case where the public keys are different, and that the attack is also applicable to the LUC system, with the same security parameters View full abstract»

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  • F1 layer modelling of ionospheric electron density distribution

    Publication Year: 1995, Page(s):1816 - 1817
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (160 KB)

    As a new method to synthesise a multi-quasiparabolic (MQP) profile, the gradient of the electron density distribution of the ionosphere is used as input data. This method suits F1 layer modelling, providing a wide range of realistic shapes in the vertical ionograms by varying the gradient. Although we focus on the vertical propagation case, further simulations have shown the effect of this modelli... View full abstract»

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  • Field experiments at 10 Gbit/s over 80, 160 and 240 km of standard singlemode fibre installed between Sesimbra and Lisbon using dispersion supported transmission technique

    Publication Year: 1995, Page(s):1860 - 1861
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (152 KB)

    10 Gbit/s dispersion supported transmission (DST) experiments over up to 240 km of installed standard singlemode fibre (SMF) have been carried out using the existing fibre infrastructure between Sesimbra and Lisbon in Portugal, which is a part of the CPRM terrestrial fibre network. These experiments demonstrate the robustness of DST under real operating conditions View full abstract»

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  • Robust algorithm for single and multiple 3-D motion estimation

    Publication Year: 1995, Page(s):1824 - 1826
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (248 KB)

    The authors describe how a robust estimation method can facilitate the measurement of 3-D motion parameters for one or more objects viewed by a calibrated binocular camera system. Statistical evaluations on demanding simulation test data sets are reported View full abstract»

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  • Simplified scheme for realisation of Chua oscillator by using SC-CNN cells

    Publication Year: 1995, Page(s):1794 - 1795
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (156 KB)

    A new simplified scheme for the Chua oscillator, realised bp using a state controlled cellular neural network (SC-CNN), is reported. The number of operational amplifiers (opamps) for the introduced implementation has been greatly reduced with respect to previous realisations. Experimental and simulation results are included to show the suitability of the considered configuration View full abstract»

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  • Improved bidirectional beam propagation method for analysis of reflection on nonparallel interfaces

    Publication Year: 1995, Page(s):1867 - 1869
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (244 KB)

    An improved bidirectional beam propagation method (IBBPM) is proposed, to allow the analysis of optical wave reflection and transmission in waveguiding structures with multiple nonparallel interfaces View full abstract»

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  • Comparison of optical millimetre-wave system concepts with regard to chromatic dispersion

    Publication Year: 1995, Page(s):1848 - 1849
    Cited by:  Papers (99)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (176 KB)

    The author reports the impact of chromatic dispersion in optical millimetre-wave systems operating in the 1.55 μm wavelength window. Experimental and theoretical results confirm the dramatical millimetre-power degradation in conventional amplitude modulated systems using for example, external optical modulators. In comparison, by use of a similar setup a self-heterodyne-based system concept has... View full abstract»

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  • High temperature operation with low-loss coupling to fibre for narrow-beam 1.3 μm lasers with butt-jointed selective grown spot-size converter

    Publication Year: 1995, Page(s):1838 - 1840
    Cited by:  Papers (22)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (260 KB)

    High temperature operation is demonstrated for narrow-beam 1.3 μm lasers with butt-jointed selectively grown spot-size converters. Low thresholds of 5.6 mA and 15.8 mA at 25°C and 85°C and a maximum operating temperature of 134°C were obtained. Low loss coupling to fibre of <1.8 dB was achieved in the temperature range from 25°C to 85°C with an output power up to 30 mW View full abstract»

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  • Reduced-state sequence estimation of OFDM signal in frequency selective Rayleigh fading channels

    Publication Year: 1995, Page(s):1802 - 1803
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (176 KB)

    A reduced-state sequence estimation (RSSE) for detecting orthogonal frequency division multiplexing (OFDM) signals transmitted over frequency selective Rayleigh fading channels is proposed. The Viterbi algorithm (VA) is used to search for the best path through the reduced-state trellis. Simulation results show that the proposed scheme reveals improved performance in symbol error rate (SER) compare... View full abstract»

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  • Low loss achieved in sol-gel based silica-on-silicon integrated optics using borophosphosilicate glass

    Publication Year: 1995, Page(s):1833 - 1834
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (172 KB)

    Polarisation-independent propagation losses of 0.2 dB/cm are reported for near-infrared silica-on-silicon channel guides formed using sol-gel borophosphosilicate glass deposited by repetitive spin coating and rapid thermal annealing. The low loss is ascribed to a reduction in process temperature, which has allowed a total glass thickness of 30 μm. The use of two dopants allows the glass viscosi... View full abstract»

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  • Unified array architecture for discrete cosine transform, sine transform and their inverses

    Publication Year: 1995, Page(s):1811 - 1812
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (160 KB)

    A unified array design for the discrete cosine transform, discrete sine transform and their inverses based on a new general formulation is presented. The presented design provides the flexibility to adaptively select different types of transforms in transform coding according to the characteristics of images for minimising the bit rate as much as possible View full abstract»

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  • State-space synthesis of log-domain oscillators

    Publication Year: 1995, Page(s):1797 - 1799
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (208 KB)

    A state-space synthesis of oscillators based on log compression is presented. The approach is an extension of the recently proposed current-mode log domain filter synthesis methodology. Both simulated and measured results demonstrate that very low distortion oscillators can be synthesised at several megahertz using simple processing building blocks and off-the-shelf transistor arrays View full abstract»

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  • Design and analysis of a low power HEMT SRAM cell

    Publication Year: 1995, Page(s):1828 - 1829
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (140 KB)

    Design and evaluation of a novel high speed low power static RAM cell in AlGaAs/GaAs quantum well technology is presented. A current sense amplifier to accompany this cell is also proposed. Simulation results show an access time of 700 ps with standby and active currents of 14 μA/bit and 0.29 mA/bit, respectively. The cell area is found to be comparable to that of the corresponding full DCFL ce... View full abstract»

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  • Partially relaxed multiquantum well InGaAs/AlGaAs heterojunction phototransistor operating at 955-970 nm

    Publication Year: 1995, Page(s):1870 - 1871
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (172 KB)

    The authors report a partially relaxed InGaAs multiquantum well based heterojunction phototransistor with high responsivity in the transmission window of the GaAs substrate which shows no degradation in performance due to lattice relaxation. The peak responsivity increased from 10 A/W at 0.5 μW incident optical power to 100 A/W at 50 μW corresponding to a current gain of 925. At 8 V collecto... View full abstract»

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  • Mechanism of drain current droop in GaAs MESFETs

    Publication Year: 1995, Page(s):1875 - 1876
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (172 KB)

    The mechanisms responsible for the drain current droop in GaAs MESFETs are discussed and their relative contributions evaluated. Contrary to a common belief that the cause is mainly self-heating, it is shown on the example of a power MESFET that deep level effects (surface states and bulk traps) have a higher contribution View full abstract»

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  • Discrete-time cellular neural networks using distributed arithmetic

    Publication Year: 1995, Page(s):1851 - 1852
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (164 KB)

    An efficient digital architecture for the discrete-time cellular neural networks (DTCNNs) is proposed that employs the distributed arithmetic (DA). It consumes little silicon area because of the bit serial computation of DA, and offers higher speed operation than the analogue implementations of DTCNN. The proposed architecture has been implemented in a 0.8 μm CMOS technology View full abstract»

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  • Universal filter using unity-gain cells

    Publication Year: 1995, Page(s):1817 - 1818
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (144 KB)

    The authors propose the use of both current and voltage followers for implementation of a universal filter. The aim is to show how, by using only unity-gain cells as active components, a universal filter can be obtained with improved performance over classical filters View full abstract»

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  • Polarisation-independent wavelength conversion using nonlinear optical loop mirror

    Publication Year: 1995, Page(s):1862 - 1863
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (172 KB)

    A polarisation-independent all-optical wavelength conversion technique is proposed that uses a nonlinear optical loop mirror (NOLM). When the polarisation state of the input signal light is varied, wavelength-converted signals exhibit a converted power fluctuation of only 0.6 dB, and the receiver sensitivity does not change View full abstract»

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  • Red and orange Pr3+/Yb3+ doped ZBLAN fibre upconversion lasers

    Publication Year: 1995, Page(s):1842 - 1843
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (168 KB)

    Room temperature continuous-wave upconversion laser oscillation at 635 nm is reported for a Yb3+sensitised Pr3+-doped fluorozirconate fibre cavity pumped by a single semiconductor laser operating at a wavelength near 860 nm. Using a similar setup, upconversion lasing at a wavelength of 602 nm has also been obtained View full abstract»

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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.

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Meet Our Editors

Editors-in-Chief

Professor Chris Toumazou
Director of the Biomedical Institute
Imperial College, London, UK

Professor Ian White
Head of Photonics Research
University of Cambridge, UK