Design of real-time fast polarization control algorithm
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摘要: 为了有效地解决方向固定-相位可调型偏振控制器偏振盲区问题，同时实现对该偏振控制器输出光束偏振态的快速实时控制，采用三波片级联的偏振控制器，设计了新的偏振控制算法，通过分步逼近算法粗调以及比例-微分算法细调相结合的方法，降低了偏振控制算法的复杂度，提高了偏振控制的速度。结果表明，该偏振算法有效地控制了输出光束的偏振态，使其始终在目标偏振态附近，且该偏振控制器的响应速度在10ms量级。在增加反馈系统的基础上，该偏振控制器达到了实时快速稳定地控制输出偏振态的目的。Abstract: In order to solve the "blind area" problem and control the polarization state of the output optical beam of the polarization controller in real-time, a new polarization control algorithm was proposed by using three cascading waveplates. The complexity of the algorithm was reduced and the speed of the polarization control was improved by combining the coarse control (the step-by-step approach algorithm) and the fine control (the proportional-differential algorithm). Through theoretical analysis and experimental test, the results show that the algorithm does well so that the polarization state of the device's output optical beam is always near the objective state. And the response time of the polarization controller is about 10ms. The polarization controller proposed in the paper has achieved the aim of real-time controlling the output polarization state fast and steadily by adding the feedback structure into the polarization control system.
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Table 1 Control parameter in the initial process
control voltage of the 1st wave-plate/V control voltage of the 2nd wave-plat/V control parameter 1.600 2.000 9.4933 1.600 2.250 11.8780 1.700 2.000 12.2870 1.700 2.250 11.6160 2.400 2.000 5.4672 2.400 2.250 9.7153 
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Table 2 The control voltage of the polarization controller and the polarization state of the output beam
the input polarization state control voltage/V the output polarization state (-0.50249240, 0.86316150, -0.04953419) (2.225, 2.600, 2.250) (0.99913450, -0.03485601, -0.02269625) (0.78678050, -0.04899382, 0.61528530) (2.975, 1.800, 2.250) (0.99539230, 0.06506954, 0.07042807) (0.44206260, 0.70274700, -0.55742900) (2.475, 2.400, 2.250) (0.91107190, 0.03284634, -0.41093690)
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Table 3 Deflection of the rotational axis of the 3th wave-plate
the control voltage of the 2nd wave-plate/V PSPx PSPy PSPz 1.600 0.6517 -0.6318 -0.4196 1.800 0.6011 -0.6624 -0.4472 2.000 0.7050 -0.6003 -0.3777 2.200 0.5784 -0.6724 -0.4619 2.400 0.6709 -0.6230 -0.4022 2.500 0.5685 -0.6726 -0.4737
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