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Online ISSN 1350-911X Print ISSN 0013-5194

Electronics Letters

Volume 22, Issue 18, 28 August 1986

Volumes & issues:

Volume 22, Issue 18

28 August 1986

Polarisation-maintaining fibre couplers with low excess loss
Binary sequence with a high crosscorrelation with each member of a subset of gold codes
4 Gbit/s GaAs MESFET laser-driver IC
New method for connection of test bus to a line interface circuit
GaAs PIN electro-optic travelling-wave modulator at 1.3 μm
  • Author(s): S.H. Lin ; S.Y. Wang ; Y.M. Houng
  • Source: Electronics Letters, Volume 22, Issue 18, p. 934 –935
  • DOI:  10.1049/el:19860636
  • Type: Article
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  • p. 934 –935 (2)
    A GaAs PIN travelling-wave modulator operated at 1.3 μm has been fabricated from material grown by organometallic vapour phase epitaxy (OMVPE) on an n+ (100) GaAs substrate. The device has a constant Vπ of 8 V from DC to 10 GHz and an optical extinction ratio of 13 dB. The optical insertion loss of the device is 3.5 dB, and the 3 dB frequency bandwidth is measured to be 4.1 GHz, which is limited by the microwave slowing induced by the n+ substrate.
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Two-wavelength fibre gyroscope with wide dynamic range
  • Author(s): A.D. Kersey ; A. Dandridge ; W.K. Burns
  • Source: Electronics Letters, Volume 22, Issue 18, p. 935 –937
  • DOI:  10.1049/el:19860637
  • Type: Article
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  • p. 935 –937 (3)
    An optical fibre gyroscope configuration which utilises dual-wavelength determination of the Sagnac shift is described. It is shown that this provides a means of extending the unambiguous rotation sensing range, and thus the dynamic range, of the gyroscope. Using an all-fibre system and sources at wavelengths of 812 nm and 842 nm, an increase in unambiguous sensing range of approximately 27 times is demonstrated.
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Simultaneous occurrence probabilities of rainfall among nine locations in Japan
  • Author(s): Y. Otsu ; Y. Takahashi ; T. Kozu
  • Source: Electronics Letters, Volume 22, Issue 18, p. 937 –938
  • DOI:  10.1049/el:19860638
  • Type: Article
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  • p. 937 –938 (2)
    Observation of rainfall has been performed at nine sites in Japan by NHK (Nippon Hoso Kyokai, i.e. Japan Broadcasting Corporation) during the BSE (Japan's medium-scale broadcasting satellite for experimental purposes) experimental period (1978–1981). The simultaneous occurrence probabilities of rainfall were obtained for 36 pairs of combinations among nine distant locations in Japan, and showed a clear dependence on the separation distances. It is found that this dependence of simultaneous rainfall probabilities on the separation distances is much larger than that of Italy.
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Novel lossless tunable floating FDNR simulation using two current conveyors and a buffer
  • Author(s): M. Higashimura  and  Y. Fukui
  • Source: Electronics Letters, Volume 22, Issue 18, p. 938 –939
  • DOI:  10.1049/el:19860639
  • Type: Article
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  • p. 938 –939 (2)
    Two novel lossless tunable floating FDNR simulation circuits using two current conveyors (CClls) and a buffer as active elements are proposed. The circuits have the following advantages: (i) use of only two CCIIs with the minimum number of passive elements; (ii) extremely low active sensitivities of realised FDNR; (iii) no requirements for component matching; (iv) tunability of the FDNR value through a single resistor.
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Experimental wire grid modelling for antennas on structures
  • Author(s): M.S. Smith  and  M.J. Barrett
  • Source: Electronics Letters, Volume 22, Issue 18, p. 940 –941
  • DOI:  10.1049/el:19860640
  • Type: Article
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  • p. 940 –941 (2)
    Theoretical wire grid modelling for antennas on structures involves the approximate solution of an approximate problem. By experimentally modelling the approximate problem of a wire grid replacing a continuous metal structure, it is shown that a wire grid with spacing ∽ λ/10 is a good approximation both for the far-field radiation pattern of the antenna and for its input impedance. Difficulties in providing accurate impedance predictions should therefore be ascribed to the approximate mathematical solution, rather than the wire grid model.
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Modified 1×2 directional coupler waveguide modulator
Mode spot size measurements in noncircular optical waveguides
Rigorous theory for modes of optical fibres with cladding limited by a plane
Refractive-index profile determination of single-mode fibres by far-field power measurements at 1300 nm
  • Author(s): W. Freude  and  H. Richter
  • Source: Electronics Letters, Volume 22, Issue 18, p. 945 –947
  • DOI:  10.1049/el:19860644
  • Type: Article
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  • p. 945 –947 (3)
    The refractive-index profile and dispersion data are computed from the measured far-field exit radiation pattern of the fundamental mode. Instead of Fourier-transforming the far field numerically, the near field is calculated by fitting a series of Gauss-Laguerre functions to the far field, and by further using analytical methods. The procedure is inherently insensitive against random measurement errors. We demonstrate the feasibility of this technique for the first time at a wavelength of 1300nm.
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Diode-pumped 2 μm holmium laser
Planar buried heterostructure InP/GaInAs lasers grown entirely by OMVPE
Fluoride glass etching method for preparation of infra-red fibres with improved tensile strength
  • Author(s): H.W. Schneider ; A. Schoberth ; A. Staudt ; C. Gerndt
  • Source: Electronics Letters, Volume 22, Issue 18, p. 949 –950
  • DOI:  10.1049/el:19860647
  • Type: Article
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  • p. 949 –950 (2)
    A method for the congruent dissolution of zirconium fluoride glass using an aqueous solution with zirconium ions as a complexing agent is described. Preform cleaning by this technique leads to IR fibres with mean tensile strength values as high as 400 MPa, which is an improvement by a factor of 2. The transmission loss of Teflon-jacketed fibres could be reduced by a factor of ten in comparison to fibres from untreated preforms.
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dv/dt Dependence in metal oxide varistors
New double heterostructure optoelectronic triangular barrier switch (OETBS)
Transmission characteristics of optical waveguides with multiquantum-well structures
RHEED studies on Z-cut LiNbO3
Simple technique for analysis of SC networks using general-purpose circuit simulation programs
  • Author(s): A. Cichocki  and  R. Unbehauen
  • Source: Electronics Letters, Volume 22, Issue 18, p. 956 –958
  • DOI:  10.1049/el:19860652
  • Type: Article
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  • p. 956 –958 (3)
    A new technique is proposed which enables the transformation of a large class of switched-capacitor (SC) networks into equivalent time-continuous (analogue) circuits to analyse them by use of standard, general-purpose circuit simulation programs such as SPICE It is based on a block partitioning, i.e. a total SC network is divided into small building blocks. It is shown how basic SC building blocks like integrators and summers can be modelled by equivalent two-ports containing only resistors, lossless transmission lines and current-controlled voltage sources. Furthermore, some new offset-free SC integrator schemes based on multi-step integration algorithms are also described.
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Suitable polynomials for aliasing reduction by test vector reversal in signature analysers
  • Author(s): A. Raghemi-Azar  and  P.C. Maxwell
  • Source: Electronics Letters, Volume 22, Issue 18, p. 958 –959
  • DOI:  10.1049/el:19860653
  • Type: Article
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  • p. 958 –959 (2)
    Reversing test vector order has been recommended by some authors as a scheme to reduce aliasing in signature analysis of single-output logic circuits using linear feedback shift registers. The letter analyses the method from the approach of determining if it is valid for all characteristic polynomaials. It is concluded that there is a range of polynomials for which reversal of test vector order has no effect on aliasing reduction.
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Practical means of cancelling the differential phase contribution to rain crosspolarisation at 10 GHz and above
Differential amplitude imaging in scanning optical microscope
Fluorescent liquid crystal displays
  • Author(s): R. Van Ewyk ; I. O'connor ; A. Mosley ; A. Cuddy ; C. Hilsum ; J. Griffiths ; C. Blackburn ; F. Jones
  • Source: Electronics Letters, Volume 22, Issue 18, p. 962 –963
  • DOI:  10.1049/el:19860656
  • Type: Article
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  • p. 962 –963 (2)
    Liquid crystal displays (LCDs) are commonly found in portable equipment. The main criticisms aimed at these displays are their asymmetric angle of view and dull grey appearance, which is particularly acute in low ambient lighting. It has been demonstrated that by the inclusion of a fluorescent dye it is possible to fabricate emissive LCDs with virtually a hemispherical angle of view.
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Finite-difference analysis of integrated optical waveguides without spurious mode solutions
New type of fibre-optic ring resonator
Erratum: High-Δn, small-core single-mode fibres for efficient nonlinear optical effects
Erratum: Finite-element analysis of leaky waveguide antennas
Erratum: High-sensitivity low-frequency magnetometer using magnetostrictive primary sensing and piezoelectric signal recovery

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