The 1×1 1310/1550nm Polarization-Maintaining (PM) Opto-Mechanical Bi-Directional Optical Switch is a high-performance fiber optic switch designed for applications requiring polarization state preservation. It utilizes an opto-mechanical switching mechanism to enable bidirectional transmission of optical signals at a 1310nm or 1550nm wavelength between a single input and output port, offering low insertion loss and high reliability. The PM feature ensures that the polarization state remains unchanged during switching, making it ideal for high-precision polarization-sensitive applications such as fiber optic gyroscopes (FOG), fiber optic sensing, optical communication system protection, and laboratory optical testing.