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Physics

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  • $\begingroup$ Can you specify the type of laser(s) you're using? $\endgroup$
    – A Nejati
    Commented Jul 2 at 18:26
  • $\begingroup$ I tried mostly with DFB lasers and one test was done with FP 3mW laser diode. The fluctuations occure with both types of lasers, although with the FP laser the range of fluctuations was 15% grater. $\endgroup$
    – Jimski
    Commented Jul 2 at 18:42
  • $\begingroup$ Have you tried with a low-coherence source like an LED to see if there are still fluctuations? $\endgroup$
    – A Nejati
    Commented Jul 2 at 19:22
  • $\begingroup$ And how long are the fiber optic legs? $\endgroup$
    – A Nejati
    Commented Jul 2 at 19:23
  • $\begingroup$ also do you have a waveform showing the shape of the fluctuations? i.e. are they smooth or sharp fluctuations $\endgroup$
    – A Nejati
    Commented Jul 2 at 19:24