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A wavelength tunable polarization OTDR utilizing a semiconductor optical amplifier for the received signal amplification is proposed in order to realize stable operation. Measurement experiments are carried out for a fiber link with a length of 5.7km and the state of polarization change along the fiber link is successfully estimated. In order to realize a high speed optical transmission, it is necessary to manage the Polarization Mode Dispersion (PMD) along a transmission line. For the purpose, measurement technique of PMD distribution in an optical fiber is a key technology.
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