An all-fiber isolator with 17 dB optical isolation is demonstrated. The fiber Faraday rotator uses 56 wt. percent terbium (Tb)-doped silicate fiber, and the fiber polarizers are Corning SP1060 single-polarization fiber. The effective Verdet constant of the Tb-doped fiber is measured to be -24.5 +- 1.0 rad/(Tm) at 1053 nm, which is 20 times larger than silica fiber and 22percent larger than previously reported results.
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