In the paper we present a detailed theoretical analysis of the polarization state evolution in the all-fiber Lyot depolarizer
based on a modified Mueller-Stokes equation. The results of its experimental verification are also described. Determining
the exact form of the depolarization matrix diagonal elements enabled finding the formulae for the state and degree of
light polarization at the Lyot depolarizer output in a function of the input light parameters and properties of the fiber used
in the depolarizer construction. Finally, it is shown how this device can be used for measuring the coherence length of the
light coupled into the Lyot depolarizer.
In the paper we present a new method of analysis of the optical fiber Lyot depolarizer based on application of an additional depolarization matrix in the MuellerStokes equation. As a result we found that the degree of depolarization of the light coming out of the Lyot depolarizer depends not only on length and birefringence of the highly birefringent (HB) fibers used as the Lyot depolarizer but also on coherence and polarization of the light coupled into the depolarizer.
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