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


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.


Coupler Velocimetry Noise Source Directional Coupler Intensity Fluctuation 
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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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