Fiberinthebox supply some Special Fiber cables to meet your special requirement, such as Polarization Maintaining (PM) Fiber cable, Optical Ground Wire (OPGW) Cable, Optical Phase Conductor (OPPC) Cable. Polarization Maintaining (PM) Fiber cable is made with a special fiber that maintains the polarization of light waves. It is used in instrumentation, measurement and in some applications where stability is required at speeds above 10Gbps.  We supply custom service for all the optical fiber cables, and for more details about other special fiber cables, you can contact us.