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We report on a polarization imaging device which probes a remote sample through a  flexible standard single-mode fiber. Both polarized laser source and  polarization analysis system are set on one side of the fiber, the object of  interest being probed by the beam exiting at the opposite end. Phase retardation  and polarization rotation angle due to either pure linear or pure circular  birefringent targets can be measured. In addition, the degree of polarization of  partially depolarizing targets is evaluated. The measurement method is based on  two key points: (i) the compensation of the fiber birefringence effects over a  round trip of the light by means of a miniaturized Faraday rotator set between  the output fiber end and the target, (ii) the recording of a set of data  operated when the polarization states of the light at the fiber input are  varied, followed by a specific processing of these data. An experimental setup  based on this process has been implemented. The method was assessed using  calibrated birefringent targets, and polarization images of a large variety of  targets were obtained

Polarization measurements through a standard single mode fiber for imaging and remote characterization