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- M. Bousonville, M.K. Czwalinna, M. Felber, T. Ladwig, T. Lamb, H. Schlarb, S. Schulz, C. Sydlo
DESY, Hamburg, Germany
- S. Hunziker
PSI, Villigen, Switzerland
- S. Jabłoński, P. Kownacki
Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
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Linden Photonics offers a standard single mode fibre with a special liquid crystal polymer coating. This material has a negative coefficient of thermal expansion, which significantly reduces the change of signal delay due to temperature change. Other than with normal fibre cables, the thermal coefficient of delay (TCD) is not in the range from 40 to 130 ps/km/K, but below 7 ps/km/K. Thus it is nearly as good as the phase stabilized optical fibre (PSOF) by Furukawa (specification < 5 ps/km/K). The TCD of Linden Photonic cables have been measured at DESY. In order to make this comparable, we measured the PSOF by Furukawa and furthermore three standard optical fibre cables, too. As a result, a complete picture of the TCDs of different fibres will be presented. This information is very useful in order to design optical synchronisation systems in general. It is planned to use Linden Photonics cables for the long links (fibre lengths in a range from 0.4 to 3.5 km) of the laser based synchronisation system at XFEL.
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