1. Introduction . Polarization sensitive optical coherence tomography (PS-OCT) is a functional extension of OCT, which can quantitatively measure the depth-resolved polarization properties of the birefringent sample [ 1 ]. PS-OCT is promising to be used in many biomedical applications, such as assessment of burn depth, early diagnosis of glaucoma and caries diagnosis [ 2 , 3 ]. The fiber-based PS-OCT system is desired in the clinical application, due to its advantage of miniaturiz...