IEE Colloquium on Analogue Optical Communications

18 Dec 1989

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Displaying Results 1 - 13 of 13
  • Practical applications for high-quality video transmission on optical fibres

    Publication Year: 1989, Page(s):11/1 - 11/3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (92 KB)

    The B.B.C. Planning and Installation Department carries out technical installation work in broadcast centres, creating studios, central technical areas, videotape recording and presentation suites, and all the other facilities required by a large broadcasting organisation. The particular project this paper relates to has been carried out at Broadcasting House, Bristol, where a new videotape editin... View full abstract»

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  • A comparison of analogue modulation schemes in optical fibre video transmission systems

    Publication Year: 1989, Page(s):101/1 - 101/7
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (232 KB)

    FM subcarrier schemes are shown to give a significant sensitivity advantage over AM subcarrier schemes in optical fibre video transmission systems, however, their channel multiplexing capacity within a given receiver bandwidth is about one third that of the AM schemes. Direct detection FM is shown to give a better sensitivity and channel multiplexing capacity than certain coherent detection scheme... View full abstract»

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  • Impact of 1.5μm quantum well lasers on intensity noise in analogue communication systems

    Publication Year: 1989, Page(s):2/1 - 2/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (116 KB)

    Then the increasing interest in analogue optical communications, semiconductor laser diode parameters such as linearity, modulation bandwidth and noise need to be optimised. In all these aspects, quantum well lasers are potentially better than bulk devices, due to their higher intrinsic resonance frequencies for a given optical power. This paper is concerned specifically with laser intensity noise... View full abstract»

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  • Optical squarewave frequency modulation for wideband instrumentation and video signals

    Publication Year: 1989, Page(s):9/1 - 9/4
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (176 KB)

    Among the family of pulse time modulation (PTM) techniques, square wave frequency modulation (SWFM) is particularly well suited to the transmission of high-quality wideband instrumentation and video signals such as MAC and high definition TV over optical fibres due to its attractive combination of performance and simplicity. This paper discusses aspects of SWFM and describes two experimental syste... View full abstract»

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  • Linearity considerations in high performance amplitude modulators

    Publication Year: 1989, Page(s):4/1 - 4/5
    Cited by:  Patents (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (196 KB)

    Integrated optical amplitude modulators offer a good solution for the implementation of very high speed analogue links (>10 GHz) or microwave distribution networks. Direct modulation of lasers at such high frequencies is not favoured because problems of distortion and wavelength chirp arise. In the last few years, the development of integrated optical modulators has matured to the degree where ... View full abstract»

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  • Intermodulation distortion in multi-carrier operation of semiconductor lasers

    Publication Year: 1989, Page(s):1/1 - 1/5
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (164 KB)

    Direct analogue modulation of a semiconductor laser introduces the possibility of distortion being generated as a result of nonlinearities in the conversion process. Second-order and third-order terms are likely to dominate, and, in the particular case where a multi-carrier FDM signal is used, their relative importance will depend on the system design. For narrowband operation, only third-order in... View full abstract»

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  • A video broadcast system using analogue subcarrier techniques for use in the Bishops Stortford field trial

    Publication Year: 1989, Page(s):8/1 - 8/5
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (216 KB)

    A 16 channel subcarrier multiplexed video broadcast system has been designed at BTRL to provide a picture quality of 50 dB SNR (weighted) for distribution to 16 customers, from a single 1500 nm headend laser source, via a passive optical network. This is the first reported demonstration of a subcarrier system designed for operation at 1500 nm. The laboratory demonstrator is a prototype of a system... View full abstract»

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  • Optical subcarrier multiplex calculator for video transmission

    Publication Year: 1989, Page(s):12/1 - 12/5
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (156 KB)

    The use of direct modulation of modern long wavelength lasers by many AM-VSB channels is now being widely considered by the cable TV industry. At other organisations, the use of FM instead of AM-VSB is favoured. The performance prediction of such systems requires a knowledge of both optical and video techniques. These have been combined in a spreadsheet to permit the effect of changing any optical... View full abstract»

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  • Potential low cost/high volume Fabry Perot laser for analogue applications

    Publication Year: 1989, Page(s):3/1 - 3/5
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (164 KB)

    An area of optoelectronics receiving much attention is the development of components suitable for analogue application. Two notable areas dominate: (i) cable TV, and (ii) microwave analogue links at frequencies up to 18 GHz for a whole range of applications. For many requirements, such as cable TV `backbone' link replacement employing AM (VSB) schemes, the extreme performance demands from the lase... View full abstract»

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  • IEE Colloquium on `Analogue Optical Communications' (Digest No.156)

    Publication Year: 1989
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (24 KB)

    The following topics were dealt with: optical communication equipment, semiconductor lasers, optical modulation, fibre optic links and video transmission for analogue optical communications applications View full abstract»

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  • A wide bandwidth, high dynamic range, analogue fibre optic link for EMP and EMC testing

    Publication Year: 1989, Page(s):51/1 - 51/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (188 KB)

    The use of fibre optic links (FOLs) in Electromagnetic Compatibility (EMC) and electromagnetic pulse (EMP) testing has a number of advantages over conventional coaxial transmission systems. The benefits of optical fibre include immunity to electromagnetic radiation, the non-intrusive nature of fibre upon the electric field under measurement, and reduced size and weight of the cross-site cables. Ho... View full abstract»

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  • Microwave fibre optic link design

    Publication Year: 1989, Page(s):6/1 - 6/5
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (196 KB)

    The compromise between modulation depth and intermodulation distortion in the optical transmitter is shown to be a critical parameter in determining the performance of a microwave fibre optic link. At low modulation depths directly modulated lasers exhibit lower intermodulation distortion than externally modulated lasers, however when overmodulation is employed, the systems performance of both typ... View full abstract»

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  • Pulse time modulation techniques for analogue optical fibre transmission

    Publication Year: 1989, Page(s):7/1 - 7/4
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (224 KB)

    Pulse time modulation (PTM) techniques offer attractive performance trade-offs for the transmission of analogue data over optical fibre networks. In particular, pulse width modulation (PWM) emerges as a bandwidth-efficient technique capable of supporting multiple video channels inexpensively. Recent theoretical developments relating specifically to the transmission of video signals of PWM are disc... View full abstract»

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