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Optical and Quantum Electronics

, Volume 18, Issue 6, pp 445–454 | Cite as

Excess-noise suppression in a fibre-optic balanced heterodyne detection system

  • R. Stierlin
  • R. Bättig
  • P. -D. Henchoz
  • H. P. Weber
Article

Abstract

We have investigated balanced heterodyne detection in applications where laser intensity fluctuations are the dominant noise source, as, for example, in laser Doppler velocimetry with a He-Ne laser. The suppression of excess noise in comparison with a single receiver detection system is analysed theoretically. In our heterodyne experiment we have compared two different fibre-optic Mach-Zehnder interferometers, both with single-mode polarization-preserving fibres, one in integrated form using a directional coupler, the other one with a dielectric beam-splitter as the optical mixing element. With the former we have verified the theoretical results; with the latter we have demonstrated that with a good balance the fundamental short noise detection limit can be reached.

Keywords

Coupler Velocimetry Noise Source Directional Coupler Intensity Fluctuation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman and Hall Ltd. 1986

Authors and Affiliations

  • R. Stierlin
    • 1
  • R. Bättig
    • 1
  • P. -D. Henchoz
    • 1
  • H. P. Weber
    • 1
  1. 1.University of BernBernSwitzerland

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