  Propagation of entangled photons in optical fiber is one of the fundamental
issues for realizing quantum communication protocols. When entanglement in
polarization is considered, arises the problem of compensating for the fiber
effect on photons polarization. In this paper we demonstrate an effective
solution where a Faraday mirror allows to cancel undesired effects of
polarization drift in fiber. This technique is applied to a protocol for
generating Bell states by a narrow temporal selection of the second-order
intensity correlation function.
