All-Fiber Optical Faraday Mirror Using 56-wt%-Terbium-Doped Fiber

An all-fiber optical Faraday mirror that consists of a fiber Faraday rotator and a fiber Bragg grating is demonstrated. The fiber Faraday rotator uses a 21-cm-long section of 56-wt%-terbium-doped silicate fiber. The polarization state of the reflected light is rotated 89
^°
±2
^°
with a 16-dB polarization extinction ratio.