Analysis of detection of weak signals in distributed fiber grating sensing systems

In recent years, with the rapid development of science and technology, the progress of fiber optic sensing technology is also relatively significant. In this paper, we design a circuit that can be used to amplify and detect weak signal photoelectric detection and processing by amplifying the differential input and zeroing the output, expanding the adjustable secondary, and doing a good job of power conversion, low-pass filtering and data acquisition, and then use the relevant software to carry out simulation experiments, showing that the designed circuit can effectively detect the nW-level optical signal The circuit is widely used because of its good overall linearity and anti-interference capability.