Amplification Enhanced Measurement Scheme of Pump-Dependent Dispersion in EDF Based on OLCR

We proposed an amplification-enhanced measurement scheme of pump-dependent dispersion in Erbium-doped fiber (EDF) based on optical low-coherence domain reflectometry (OLCR). An additional EDF amplifier (EDFA) is embedded into the measurement arm. The intensity of the broadband probe light can be adjusted to adapt to its dramatical variation which originates from the absorption loss and gain in the tested EDF. The adaptive adjustment can effectively suppress intensity noise and beat noise in the OLCR-based system, making longer EDF measurements feasible and reducing measurement errors in pump-dependent dispersion results. With a symmetrical broadband signal branch in the measurement arm, the background dispersions from other components in the measurement scheme can be removed. In this article, such a test scheme has been implemented and demonstrated, and the accuracy of repeated measurement has been improved 30 times compared with the traditional method.