Single polarization fiber resonant cavity based on 45-degree slant angle FGB (fiber bragg grating) technology

The invention discloses a single polarization fiber resonant cavity based on a 45-degree slant angle FGB (fiber bragg grating) technology. The single polarization fiber resonant cavity comprises a PM (polarization maintaining) fiber coupler, an input end, an input end, a 45-degree slant angle FGB and a fusion welding point, wherein the PM fiber coupler is provided with the output end and the input end; the fusion welding point is arranged between the output end and the input end; and the 45-degree slant angle FGB is written into the output end to serve as a polarizer of the fiber resonant cavity. The polarizer has low insertion loss; the 45-degree slant angle FGB is written into the PM fiber coupler so as to overcome the defects of high loss of polarization devices such as a single polarization fiber and the like, loss of fusion welding among the polarization devices and the fiber resonant cavity, mismatching of mode diameters and the like; therefore, the single polarization fiber resonant cavity based on the 45-degree slant angle FGB technology not only overcomes the noise of polarization fluctuation, but also has high resolution, can be applied to resonant type fiber gyros or other sensing fields and has important scientific significance and application value.