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.
A simple technique for measuring fiber parameter distribution of the pure silica core fiber using a conventional OTDR is
proposed. This technique is based on the relationships among fiber parameters and the bidirectional OTDR technique.
The fiber parameter distributions are successfully evaluated for a silica core fiber link.
Distribution of Brillouin shift frequencies along optical fibers are measured by a newly developed Brillouin loop amplification scheme. The frequency shift measurement for a 40-km test fiber has been successfully carried out.
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