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  • Springer  (7)
  • 1990-1994  (5)
  • 1980-1984  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Optimum design of adiabatic weakly guiding nonlinear optical fibre tapers (1991)
    Springer
    Optical and quantum electronics 23 (1991), S. 1179-1188 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We investigated the design features of adiabatic, weakly guiding optical fibre tapers for nonlinear device applications. In general, where the fibre taper ‘core’ and ‘cladding’ are of different material nonlinearities, the nonlinear effects that can be achieved depend critically on the taper parameters. For optical switches a suitable choice of taper parameters minimizes the power × length product for nonlinear operation. The maximum effective utilization of the nonlinear cladding material was found to be 21.3%. Also, nonlinear effects can be totally suppressed with an appropriate choice of design, enabling nonlinear effects that are undesirable in some applications to be avoided.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00619986
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  • 2
    Electronic Resource
    Electronic Resource
    X-junctions in buried channel waveguides (1992)
    Springer
    Optical and quantum electronics 24 (1992), S. 1373-1379 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The excess loss across an acute-angle symmetric X-junction composed of two weakly guiding single-mode buried channel waveguides of square core cross-section is shown to be very small provided the junction angle is greater than a few degrees. Numerical and approximate analytical results are presented, as well as a simple criterion for the onset of cross-talk as the junction angle decreases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00625813
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  • 3
    Electronic Resource
    Electronic Resource
    Anomalous loss in depressed-cladding and W-fibres (1993)
    Springer
    Optical and quantum electronics 25 (1993), S. 409-416 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Anomolous spikes in the loss spectrum of practical depressed-cladding fibres with a finite cladding and absorbing jacket can be explained in terms of a combination of three effects — the excitation conditions, the absorption behaviour of core and cladding modes, and the slight variation in the fibre diameter along its length.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00420582
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  • 4
    Electronic Resource
    Electronic Resource
    Splice loss in single- and twin-core buried channel waveguide devices (1994)
    Springer
    Optical and quantum electronics 26 (1994), S. 45-62 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We quantify the magnitude of the power loss incurred when a square-core buried channel waveguide (BCW) is spliced to a standard circular-core telecommunications fibre. With a view to minimizing the dissipated power, we show that a simple equal-core-area criterion provides an elegant means of determining the optimum core dimensions. This result is found to hold for more general BCW cross-sections that possess a reasonable degree of symmetry. The fundamental problems of waveguide misalignment and angular tilt are also investigated and their effect on splice loss is quantified. Our theoretical model is applied to both single- and twin-core waveguides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00573900
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  • 5
    Electronic Resource
    Electronic Resource
    Variational approximations for higher-order modes of weakly-guiding fibres (1984)
    Springer
    Optical and quantum electronics 16 (1984), S. 41-48 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Simple approximations for the fields and propagation constants of low-order modes on circular weakly guiding fibres are derived using variational techniques. The high accuracy of these approximations for quasi-parabolic profiles is demonstrated in the case of the Gaussian profile, for which there are no analytical solutions of the scalar wave equation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00619876
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  • 6
    Electronic Resource
    Electronic Resource
    A numerical technique for solving the scalar wave equation for Gaussian and smoothed-out profiles (1981)
    Springer
    Optical and quantum electronics 13 (1981), S. 217-224 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A numerical technique, based on transforming the scalar wave equation to a finite interval before discretization is applied, is proposed for the solution of the scalar wave equation defining the modal fields and propagation constants of optical fibres. It is used to compute the propagation constants and modal fields of weakly guiding fibres of circular cross-section when the refractive index profile has a Gaussian or smoothed-out form. The smoothed-out profiles are studied because they vary continuously from the Gaussian to the step profile. Results are compared with and shown to be accurately approximated by simply explicit functions, dependent only on the fibre parameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620324
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  • 7
    Electronic Resource
    Electronic Resource
    The economic impact of university funding cuts (1990)
    Springer
    Higher education 19 (1990), S. 481-495 
    Details
    ISSN: 1573-174X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Abstract Although much has been written about the impact of funding cuts on UK universities, very little work has been carried out to estimate the effects of these cuts on the local economies in which the universities are located. This paper seeks to identify changes in the funding of three Scottish universities which can be traced directly to central government, and to quantify the wider economic effects of these changes. Significant effects are estimated, which form the unintended consequences of government policy on higher education.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00137010
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