Each cable is individually tested to ensure the specified extinction ratio and insertion loss at fiber-to-fiber junctions. Each cable comes with a mating connector adaptor. Thorlabs offers Polarization-Maintaining (PM) Single Mode Fiber Optic Patch Cables with a variety of connector options, including FC/PC, FC/APC, and hybrid FC/PC to FC/APC cables. Other options include cables with high extinction ratio (ER), cables with heating wire, AR-coated patch cables. In fiber optics, polarization-maintaining optical fiber (PMF or PM fiber) is a single-mode optical fiber in which linearly polarized light, if properly launched into the fiber, maintains a linear polarization during propagation, exiting the fiber in a specific linear polarization state; there is. This high-performance Polarization Maintaining (PM) Fiber Patch Cord is engineered for precision-critical optical systems. The light is then guided in two perpendicular principle states of polarization with different propagation constants – the fast and the slow axis.
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