High-precision optical fiber strain sensing system driven by broadband light and demodulation method thereof

The invention discloses a high-precision optical fiber strain sensing system driven by broadband light, which consists of a broadband light source module, a passive optical fiber sensor module, a circulator, a phase modulation module, a delay module, a data processing module, a photoelectric conversion module and a phase-locked amplification module, broadband light is emitted from the light source to enter the first port of the circulator, is emitted from the second port to enter the annular resonant cavity and returns to the annular resonant cavity again through the phase modulator module and the delay module, and the output light enters the photoelectric conversion module in a one-way mode through the circulator to be subjected to photoelectric conversion. According to the system, various noises caused by laser are avoided, the measurement precision is higher, the cost of the system is low due to the use of a broadband light source, meanwhile, due to the use of a self-reference sensing mechanism, the system