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The Temporal Coherence of Various Semiconductor Light Sources Used in Optical Fibre Sensors

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Fiber-Optic Rotation Sensors and Related Technologies

Part of the book series: Springer Series in Optical Sciences ((SSOS,volume 32))

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Abstract

Many kinds of coherent sensors have been devised which use optical fibres. The choice of light source is dictated by many requirements including: high brightness (hence high launched power), ruggedness, insensitivity to reflections, reliability, low AM and FM noise, cost and power consumption. Most early experimental sensors used HeNe lasers, one benefit being direct visibility to the eye. Such lasers are also highly coherent and this was thought by many to be an essential requirement. However, high coherence is only required if the sensing interferometer has a large path difference, ie. if (T2–T1) >> 2π/ω) in Fig. 1.

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References

  1. Michelson Stellar Interferometer, “Principles of Optics”, M. Born & E. Wolf, 7.3.6

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  2. “Limitation of rotation sensing by scattering”, C. Cutler, S. Newton, H. Shaw, Opt. Lett. 5, 488, Nov. 1980

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  4. “Reduction of backscattering error in an optical fibre gyro”, S. Newton, C. Cutler, H. Shaw, CLEO 81, ThM6

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  5. “Modal noise causes and cures”, R. E. Epworth, Laser Focus, Sept. 1981, pp. 109 – 115

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  6. “Measurements of static and dynamic coherence phenomena using a Michelson interferometer”, R. E. Epworth, Proc. 5th European Conference on Optical Communication, Amsterdam, 1979

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Author information

Authors and Affiliations

  1. Standard Telecommunication Laboratories Ltd., London Road, Harlow, Essex, Great Britain

    R. E. Epworth

Authors
  1. R. E. Epworth
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Editor information

Editors and Affiliations

  1. Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA

    Shaoul Ezekiel

  2. Laboratoire Central de Recherches, Domaine de Corbeville, Thomson-CSF, B.P.10, F-91401, Orsay Cedex, France

    Hervé J. Arditty

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© 1982 Springer-Verlag Berlin Heidelberg

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Epworth, R.E. (1982). The Temporal Coherence of Various Semiconductor Light Sources Used in Optical Fibre Sensors. In: Ezekiel, S., Arditty, H.J. (eds) Fiber-Optic Rotation Sensors and Related Technologies. Springer Series in Optical Sciences, vol 32. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-39490-7_26

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  • DOI: https://doi.org/10.1007/978-3-540-39490-7_26

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-662-13527-3

  • Online ISBN: 978-3-540-39490-7

  • eBook Packages: Springer Book Archive

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