24 July 2014 Phase tracking with differential dispersion
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Abstract
Differential chromatic dispersion in single-mode optical fibres leads to a loss of contrast of the white light fringe. For the GRAVITY instrument, this aspect is critical since it limits the fringe tracking performance. We present a real-time algorithm that compensates for differential dispersion due to varying fibre lengths using prior calibration of the optical fibres. This correction is limited by the accuracy to which the fibres stretch is known. We show how this affects the SNR on the white light fringe for different scenarios and we estimate how this phenomenon might eventually impact the astrometric accuracy of GRAVITY observations.
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Xavier Haubois, Sylvestre Lacour, Guy S. Perrin, Roderick Dembet, Pierre Fedou, Frank Eisenhauer, Karine Rousselet-Perraut, Christian Straubmeier, Antonio Amorim, Wolfgang Brandner, "Phase tracking with differential dispersion", Proc. SPIE 9146, Optical and Infrared Interferometry IV, 91461Y (24 July 2014); doi: 10.1117/12.2056410; https://doi.org/10.1117/12.2056410
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