The Polarization Insensitive Isolator is designed and manufactured with low insertion loss and high isolation. The unique manufacturing process and optical path epoxy-free design enhance the device high power handling capability. The device is characterized with high performance, high reliability and low cost. It has been widely used in EDFAs, Raman amplifiers, DWDM systems, fiber lasers, transmitters and other fiber optics communication equipment to suppress back reflection and back scattering. It is ideal for fiber laser and instrumentation applications. It is designed and manufactured according to Telcordia standard.