In order to make the optical signals carrying the measured information more truly restore the cylinder pressure signals,based on the principle of fiber sensing,the structure and working process of the demodulation system were analyzed. The circuit structure of the demodulation cylinder pressure signals was designed,and the parameter index values were studied. Cadence PSpice simulation software and circuit diagram plate-making experiments were used to verify the rationality of the work. The sensitivity analysis of the designed circuit was carried out to determine the key components that have a greater impact on the circuit performance,and predict the variation range of the circuit performance indexes when the key components took different tolerances of ±5％,±1％,±0.5％ and ±0.1％,which can provide the basis for researchers to choose the best device.
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