M-Z interface light path structure with all polarization-maintaining function

A M-Z interface light path structure with an all polarization-maintaining function, comprising a polarization beam-splitting device, a first polarization-maintaining-transferring device, a first faraday rotator mirror, and a second polarization-maintaining-transferring device, a second faraday rotator mirror, a first polarization-maintaining coupler;

• the polarization beam-splitting device configured to receive light input by a light source and output a first polarized light and a second polarized light with the same polarization state;
• the first polarization-maintaining-transferring device comprising a first port, a second port, and a third port, the first port of the first polarization-maintaining-transferring device receiving the first polarized light output by the polarization beam-splitting device, the second port of the first polarization-maintaining-transferring device is connected to the first faraday rotator mirror, and the third port of the first polarization-maintaining-transferring device connected to a first port of the first polarization-maintaining coupler, wherein fiber connected between the first port of the first polarization-maintaining-transferring device and the polarization beam-splitting device, and fiber connected between the third port of the polarization-maintaining-transferring device and the first port of the first polarization-maintaining coupler are polarization-maintaining fiber;
• the second polarization-maintaining-transferring device comprising a first port, a second port, and a third port, and the first port of the second polarization-maintaining-transferring device receiving the second polarized light output by the polarization beam-splitting device, the second port of the second polarization-maintaining-transferring device connected to the second faraday rotator mirror, and the third port of the second polarization-maintaining-transferring device connected to a second port of the first polarization-maintaining coupler, wherein fiber connected between the first port of the second polarization-maintaining-transferring device and the polarization beam-splitting device, and fiber connected between the third port of the polarization-maintaining-transferring device and the second port of the first polarization-maintaining coupler are polarization-maintaining fiber.