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8 October 2015 Analysis and optimization of all-fiber polarization transformers
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Proceedings Volume 9679, AOPC 2015: Optical Fiber Sensors and Applications; 967902 (2015)
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China
The influence of the spin rate profiles on the stability of polarization transformations of all-fiber polarization transformers (AFPTs), which behave as a broad-band all-fiber quarter-wave plate, is analyzed by the super-mode theory. Huang firstly proposed and demonstrated these AFPTs, and suggested qualitatively that to perform a stable polarization transformation, the variation of the spin rate from zero to fast of the AFPT should be slow. However a compact fiber structure is desirable for an optical current transformers (OCT) system, and bending or wrapping AFPTs will weaken their abilities to hold the output SOPs. A first-order analytical approximation describing the coupling between the two local eigen-modes in the AFPT is derived, and two more detail suggestions for the spin rate profiles design of AFPTs are proposed. A random orthogonal axial gradient method (ROAGM) is developed to optimize the spin rate profiles. Numerical simulations show that for an AFPT with a shorter length, the stable transformation can also be obtained by a carefully designed spin rate profile according the two suggestions.
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Yue-yu Xiao, Yi-wei Gao, and Hui-xiang Yang "Analysis and optimization of all-fiber polarization transformers", Proc. SPIE 9679, AOPC 2015: Optical Fiber Sensors and Applications, 967902 (8 October 2015);

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