Signal Detection Circuit Design For Slow-Light Optic Fiber Gyroscope

This paper focuses on the high sensitivity fiber optic gyroscope which is based on slow-light. In the beginning, we present the basic principle of the Sagnac effect. In the following, we analyze that why can we get greatly upgrading of the scale factor when the gyroscope uses the slow-light; and also if we want to get these effects, we need changes on the structure of the fiber optic gyroscope.On the great updating of scale factor, the directly time interval of the fiber optic gyroscope detection is given. This scheme is based on TDC which can directly detect the time interval. It needs photo-sensor, ultrahigh speed comparator, electrical level converter, TDC and DSP. To suppress the noise in the data, a digital filter is designed and transplanted on the DSPThe traditional detection of the close loop gyroscope is phase detection. This scheme focuses on the zero phase setting loop principle and design. The loop is made up of modulation of ladder and square wave. Finally this paper present the post-route simulation of digital circuit describe by Verilog HDL language.The data of the gyroscope outputting contains all kinds of random noise. The noises come from optical source, parasitizing effect, electrical circuit and the environment. The theory of wavelet filtering has a nice effect on the de-noising of the gyroscope data, which is demonstrated by the figure of data after filtering.