Measurement Range Enhancement of Rayleigh-Based Optical Frequency Domain Reflectometry With Bidirectional Determination

We report a noble coherent optical frequency domain reflectometry (OFDR) system that simply enables measurement range enhancement up to full coherence length of a laser source. The proposed technique is based on bidirectional determination of Rayleigh backscattered signal along a fiber. To do this, complex OFDR signals are acquired with the help of $\pi / 2$ phase-shifting interferometry in a dete...