A one-degree of freedom (DOF) tunable single fiber ring depolarizer is proposed by setting the bend-induced birefringence in the fiber ring specially to behave as a half-wave plate (HWP) and with the optimal coupling ratio of the coupler. Depolarization can be realized by just rotating the fiber ring. The methods of making and testing the HWPperformance of the fiber ring are analyzed and discussed. A 12-meter long fiber ring depolarizer is demonstrated to depolarize a Fabry-Perot (FP) laser with 10-meter coherent length. Degree of polarization (DOP) of 1.5% can be reached by rotating the whole set of fiber ring. Moreover, if a polarizer ahead of the fiber ring is inserted, a full scale one degree of freedom tunable depolarizer can be realized.
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Tao Liu ; Qingyang Yu ; Chunhua Wang ; Li Li and Shengfei Zhang
Fiber ring depolarizer with one degree of freedom
", Proc. SPIE 8557, Optical Design and Testing V, 85571R (November 26, 2012); doi:10.1117/12.999772; http://dx.doi.org/10.1117/12.999772