Owing to their excellent resistance to environmental interference and high stability, all-polarization-maintaining mode-locked fiber lasers hold significant application value in various fields, including industrial processing, communications, medical applications, and military. Owing to their excellent resistance to environmental interference and high stability, all-polarization-maintaining mode-locked fiber lasers hold significant application value in various fields, including industrial processing, communications, medical applications, and military. Owing to their excellent resistance to environmental interference and high stability, all-polarization-maintaining mode-locked fiber lasers hold significant application value in various fields, including industrial processing, communications, medical applications, and military applications. This. Polarization maintaining (PM) fiber is a specialized optical fiber designed to maintain the polarization state of light as it propagates through the fiber. Applications for polarization-maintaining fibers include telecommunications, medicine, and sensors. A typical application is to use interference for measurement to ensure that the light propagating in the signal arm and reference arm of the interferometer is always recombined with the same.