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A rotating coordinate system model is used to describe the procedure of polarization detection in polarization optical time-domain reflectometry (POTDR), which reveals the relationship of the system response with respect to the initial state of polarization and the direction of the polarizer. On this basis, a 45° aligned dual-polarizer structure is proposed for the suppression of signal fading in the POTDR system. For ease of practical application, an integrated space optics scheme is implemented with the combination of three collimator