Optical fiber sensor utilizing faraday rotator mirrors and measuring system using the same

An optical fiber sensor that measuring pulses are transmitted to “n(≥2)” interferometers respectively including a measuring object, and Time Division Multiplexing (TDM) pulse trains corresponding to respective displacements of said measuring objects from said “n” interferometers are optically synthesized and are outputted,

• wherein “n−1” optical couplers to convert laser pulses into two phases of said measuring pulses and delaying pulses are provided;
• wherein a first stage optical coupler inputs laser pulses from a laser source, and a second stage to (n−1)th stage optical couplers respectively input said delaying pulses from a previous stage via a delay section;
• wherein n-th optical coupler transmits said delaying pulses from (n−1)th optical coupler to said n-th interferometer and inputs;
• wherein respective TDM pulse trains outputted from said “n” interferometers are sequentially and optically synthesized, and a multiple TDM pulse train is outputted;
• and
• wherein respective said “n” interferometers comprise a constitution that:
• said laser pulses are separated into two phases of a reference path and a measurement path including a measuring object, which form an interferometer, by a second optical coupler via a first optical coupler;
• a first Faraday Rotator Mirror (FRM) is provided at an end of said reference path and a second FRM is provided at an end of said measurement path;
• and
• a reference reflected light of said first FRM and a measurement reflected light of said second FRM are interfered at said second optical coupler and are converted into three phases, converted first phase pulses are transmitted to an optical synthesis section via said first optical coupler, converted second phase pulses are transmitted to said optical synthesis section via a first delay section, converted third phase pulses are transmitted to said optical synthesis section via a second delay section, and a time division pulse train is outputted from said optical synthesis section.