All-optical-fiber fabry-perot resonant cavity based on micro optical fiber annular mirror and method for making same

The invention discloses all-fiber Fabry-Perot resonant cavity based on a micro optical fiber loop mirror and a preparation method thereof. The resonant cavity is mainly composed of three micro optical fibers, wherein the first micro optical fiber is prepared into the Fabry-Perot resonant cavity; the second micro optical fiber is coupled with one end of the resonant cavity and is used for inputting optical signals; the third micro optical fiber is coupled with the other end of the resonant cavity and is used for collecting resonant optical signals in the resonant cavity. The all-fiber Fabry-Perot resonant cavity is simple in structure, and has the advantages of small size, good stability, easy control and regulation, and the like. At present, the obtained maximum Q value is 5700, the range of a free spectral range is from 0.5 to 2 nm, and the maximum extinction ratio is 18dB.