Spatial Resolution Improvement in OFDR Using Four Wave Mixing and DSB-SC Modulation

Spatial resolution in optical frequency domain reflectometry (OFDR) is a function of frequency sweep span. In this letter, a new method to enhance OFDR spatial resolution is proposed, by increasing the applied sweep span. The proposed method uses degenerated four wave mixing (FWM) with only a single light source, and this results in a preserved coherence length. The double sideband with suppress c...