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  • 1
    Electronic Resource
    Electronic Resource
    Measuring method for the refractive index profile of optical glass fibres (1975)
    Springer
    Optical and quantum electronics 7 (1975), S. 109-113 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A new method for measuring the refractive index profile of optical glass fibres is described. This simply monitors the reflection of a focused laser beam from a polished fibre end face. Detailed tests on the accuracy and resolution of the method are described and the index profiles of several fibres are given as an example of its feasibility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00631591
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Polarization noise in single mode fibres and its reduction by depolarizers (1983)
    Springer
    Optical and quantum electronics 15 (1983), S. 281-287 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Fluctuations of the state of polarization in single mode fibres due to environmental conditions such as vibrations cause intensity noise if elements with polarization-dependent loss are inserted into the fibre system. Diffraction gratings, which are key elements for wavelength division multiplex-single mode fibre systems, exhibit a strong polarization dependence of loss. The polarization noise, originating from the combination of single mode fibres and diffraction gratings, is investigated experimentally. A drastic deterioration of the signal/noise ratio is observed, which is even more severe than modal noise with multimode fibres. Depolarizing devices, which reduce this kind of noise sufficiently, are presented and examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00619897
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  • 3
    Electronic Resource
    Electronic Resource
    Light coupling problems for GaAs laser-multimode fibre coupling (1976)
    Springer
    Optical and quantum electronics 8 (1976), S. 301-307 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Two methods of coupling a multimode fibre to a GaAs double-heterostructure laser are investigated: firstly direct coupling into a plane fibre end face, and secondly coupling via a cylindrical glass fibre lens. The power coupled into the fibre was measured for three different lasers (and with one laser as a function of its bias current). The measured coupling efficiency was compared with theoretical considerations. Optical feedback effects due to reflection of the fibre end face have been observed. These cause an oscillation of the coupled power, when the separation between the laser and the fibre end face is varied by only a few tenths of a micron. The alignment tolerances using a fibre lens were, as expected, more critical than for direct coupling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00619542
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  • 4
    Electronic Resource
    Electronic Resource
    Light coupling from a junction laser into a monomode fibre with a glass cylindrical lens on the fibre end
    Amsterdam : Elsevier
    Optics Communications 12 (1974), S. 93-97 
    Details
    ISSN: 0030-4018
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0030-4018(74)90081-9
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