Abstract
We propose a pump-enhanced evaluation scheme of Rayleigh backscattering (RBS) coefficient distribution along the erbium-doped fiber (EDF) based on optical low-coherence domain reflectometry (OLCR). The scattering coefficient distribution in meters-long EDF with micron spatial resolution is demonstrated for the first time. A systematic model is established correspondingly, and the RBS signal can be recovered from the amplified signal (the conventional gain distribution). The detection capability for the weak RBS is improved by the amplification of EDF itself and the low coherence length of the broadband light source. The RBS coefficient distribution of 2 m EDF is compared with standard single-mode fiber to prove its feasibility. The strong variation of the RBS distribution in commercialized EDF is demonstrated clearly, which is useful for the background loss and noise analysis of EDF-based amplifiers and lasers.
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