Polarization -maintaining fiber coupler

The utility model discloses a polarization -maintaining fiber coupler, including the coupling steel pipe, the inside of coupling steel pipe is provided with main line optic fibre and by -pass way optic fibre respectively to the fixed surface of coupling steel pipe is connected with protection jacket, the equal fixedly connected with fixed locking device in both sides of coupling steel pipe inner wall, the inner wall of coupling steel pipe just is located fixedly connected with quartz capsule between two fixed locking device, the inner wall of quartz capsule just is close to fixed locking device's the equal fixedly connected with epoxy glue piece in both sides, the utility model relates to a fiber optic gyroscope technical field. This polarization -maintaining fiber coupler has solved the circumstances that present polarization -maintaining fiber coupler still adopted single structure to carry out the coupling, has avoided ten fens complicated problems of operating method, better improvement stationary stable'