Abstract
A hybrid single-end-access BOTDA and COTDR sensing system is proposed and
demonstrated experimentally. In our configuration, the heterodyne detection techniques
are applied to improve the SNR of the single-end-access BOTDA. Without adding extra
instruments, our system could easily switch between BOTDA and COTDR modes by changing
the intermediate frequency of the detected heterodyne signals. We performed the
distributed temperature measurement when the sensor works as BOTDA, and a 24 km sensing
range with 5m resolution together with a temperature uncertainty of 1.0°C are
achieved. When it operates as COTDR, a peak dynamic range of 12 dB is obtained by using
50 ns probe pulse and the loss coefficient of fiber under test (FUT) is accurately
measured. The hybrid system not only offers an excellent solution for the requisite of
two-end-access in conventional BOTDA and obtains a longer measurement range than that of
the existed one-end BOTDA, but also can be used to measure the attenuation of a fiber
link or locate the discrete defects on optical fiber systems.
© 2013 IEEE
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