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IEE Review

Issue 3 • Date 9 March 1989

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  • Optical amplifiers-light boosters in a chip

    Publication Year: 1989, Page(s):107 - 110
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (317 KB)

    One potential way of building transmission systems able to accommodate capacity upgrades is to use optical amplifiers. These devices simply amplify the incoming optical signal. They are insensitive to the transmission bit rate and data format, have a broad optical bandwidth, and, in principle, pass signals in either direction. Optical amplifiers are thus highly flexible devices, potentially able t... View full abstract»

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  • Power for development-electricity in the Third World

    Publication Year: 1989, Page(s):101 - 105
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (446 KB)

    Electrical power is a vital prerequisite for any modern economy. Even in the least developed countries, the availability of a reliable power supply at reasonable cost is important for economic growth and development. The critical issue is that the demand for electrical power in developing countries keeps expanding faster than the growth of supply, which is constrained by financial, technical and m... View full abstract»

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  • AM terrestrial broadcasting-past, present and future

    Publication Year: 1989, Page(s):89 - 91
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (293 KB)

    The author gives a brief history of the development of broadcasting, in particular sound broadcasting by amplitude modulated signals (AM). The author then discusses the developments still taking place in AM broadcasting concerned with high power transmitters and associated equipment. Politics and propaganda broadcasting are briefly mentioned as is religious missionary broadcasting. The growth of A... View full abstract»

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