  We developed an alternative configuration of simplified Brillouin optical
correlation-domain reflectometry, which can overcome the drawbacks of the
original configuration. This system uses, as reference light, the light that is
Fresnel reflected at a partial reflection point artificially produced near an
optical circulator. We show that the influence of the 0th correlation peak
fixed at the partial reflection point can be suppressed by replacing the nearby
fibers with other fibers having different Brillouin frequency shift values
(here, multi-mode fibers are used). Finally, we demonstrate a distributed
measurement for detecting a 1.46-m-long strained section with a high
signal-to-noise ratio.
