High Power Isolator utilizes  the effect of TGG to guide optical light in one direction and eliminates back reflection and back scattering in the reverse direction at any polarization state. The devices are characterized with low insertion loss, high isolation, high return loss, low cost. It has been widely used in EDFAs, Raman amplifiers, Fiber lasers, transmitters and other fiber optic communication equipments to suppress back reflection and back scattering.