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Radio and Electronic Engineer

Issue 11 • Date November 1973

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Displaying Results 1 - 7 of 7
  • Fibres, lasers and communications

    Publication Year: 1973, Page(s):653 - 654
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (282 KB)

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  • Optical fibres for communications

    Publication Year: 1973, Page(s):655 - 664
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1453 KB)

    This paper presents a review of the state of the art of optical fibres and their potential use as waveguides for long-distance transmission of light. The physical principle of light guidance in fibres is discussed and the advantages and short comings of fibres are pointed out. The properties of single and multimode fibres are reviewed. View full abstract»

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  • The challenge of fibre-optical communication systems

    Publication Year: 1973, Page(s):665 - 674
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (4968 KB)

    The paper reviews the demands made on technology by the potential impact of fibre-optical communication systems. The reasons for the interest in this technology are discussed in terms of discounted cash flow for wideband transmission installation. The primary system requirements are identified and research aimed at developing fibre-optic cable, light sources and terminal sub-systems is described. ... View full abstract»

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  • Use of laser amplifiers in a glass-fibre communications system

    Publication Year: 1973, Page(s):675 - 682
    Cited by:  Papers (14)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1001 KB)

    A glass-fibre communications system using travelling-wave amplifiers operating on the laser principle is studied. The propagation characteristics of such a system are investigated theoretically with the aid of the mean value and variance of the statistical distribution of the number of photons. When linear optical amplifiers are used, the noise increases at each stage on account of spontaneous emi... View full abstract»

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  • Effect of loss on propagation in multimode fibres

    Publication Year: 1973, Page(s):683 - 688
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (822 KB)

    An analysis is given of propagation in multimode optical fibres having finite transmission loss. Using experimentally-deduced values for the cladding loss, fibre dispersions are calculated for a range of input beam widths and are compared with experiment. It is shown that the core loss has little effect on dispersion. Cladding loss reduces dispersion for a relatively small increase in attenuation,... View full abstract»

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  • Design of a staggered-p.r.f. moving target indication filter

    Publication Year: 1973, Page(s):689 - 694
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (878 KB)

    To avoid blind speed phenomena, staggered-p.r.f. m.t.i. systems are used in modern radars for detection of high-speed targets. In this paper a procedure is presented which considers both the effect of filter weights and the interpulse durations. The goal of this procedure is to yield an m.t.i. response with minimum variations in the pass-band and maximum attenuation in the stop-band. View full abstract»

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  • The frequency limitations of a gyrator circuit

    Publication Year: 1973, Page(s):695 - 702
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1074 KB)

    An approximate analysis of the Rao¿Newcomb gyrator circuit is presented. It is justified by comparison of its predictions for the y-parameters of the gyrator with predictions based on computation by general-circuit-analysis program and with predictions based on admittance measurements. The unconditional stability, passivity and performance Jimitations of the gyrator are discussed. View full abstract»

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