Measurement of polarisation parameters by in-line fiber-optic devices

In the paper theoretical and experimental investigations of a possibility the full polarization parameters measurement by the in-line fiber-optic devices are described. The discussed systems based on the polarimeter as well as Sagnac interferometer configuration. The detection of the polarisation state as well as degree of the polarisation in real time by the devices containing standard single-mode fiber and an appropriate applied modulation technique is a new systems property. The comparison of described systems, based on experimental results, is also-presented in the paper.