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The RoboPol instrument and the relevant program was developed in order toconduct a systematic study of the optical polarisation variability of blazars.Driven by the discovery that long smooth rotations of the optical polarisationplane can be associated with the activity in other bands and especially ingamma rays, the program was meant to investigate the physical mechanismscausing them and quantify the optical polarisation behaviour in blazars. Overthe first three nominal observing seasons (2013, 2014 and 2015) RoboPoldetected 40 rotations in 24 blazars by observing a gamma-ray-loud andgamma-ray-quite unbiassed sample of blazars, providing a reliable set of eventsfor exploring the phenomenon. The obtain datasets provided the ground for asystematic quantification of the variability of the optical polarisation insuch systems. In the following after a brief review of the discoveries thatrelate to the gamma-ray loudness of the sources we move on to discuss a simplejet model that explains the observed dichotomy in terms of polarisation betweengamma-ray-loud and quite sources and the dependence of polarisation and thestability of the polarisation angle on the synchrotron peak frequency.

The dependence of optical polarisation of blazars on the synchrotron component peak frequency