Magnitude of equalizer taps (IMAGE)
Caption
(a) Magnitude of equalizer taps taken at time instances 1h apart. The change in temporal position can be translated into a stretch/contraction of the fiber link. (b) Using this effect for time-of-flight measurements over 524 km of aerial fiber. The temperature shown is the average temperature of the 3 measurement stations shown in Fig. 1. (c) Average wind speed in m/s. (d) Poincar´e representation of the SOP change during 10 seconds at of minimum wind speed. (e) Corresponding Fourier transform of S1 showing the strong presence of 50 Hz and overtones. The fiber is wound around the high voltage conductor. (g) and (h) Poincar´e representation of polarization rotations after applying a 45 Hz low-pass filter for low and high wind, respectively.
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Nokia Bell Labs
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