The vibration recognition along the fiber is still a challenging problem in pipeline monitoring with distributed optical-fiber acoustic sensor (DAS), because the burying environments in a wide rang…
Internal tensile stress inside fiber core can impact significantly on formation of Draw-tower gratings (DTGs). We carry out online dynamic preparation experiments of DTG to analyze the effect of in…
The nonlinear residual intensity modulation (RIM) in a multifunction integrated optic circuit (MIOC), mainly caused by the recoupling of the stray light of the TE mode to the output fiber, can impa…