Effect of fiber and solenoid variation parameters on the elements of a corrector PID for electromagnetic fiber squeezer based polarization controller

Abstract

Controlling the polarization of the light output from single-mode fiber systems is very important for connecting it to polarization-dependent integrated optical circuits, while applications using a heterodyne detection system. Polarization controller using fiber squeezer is attractive for a low-loss, low-penalty coherent optical fiber trunk system. However, for polarization controllers using electromagnetic fiber squeezer, the stability problem due to the saturation of their magnetic circuit must be studied. In fact, in their conventional configuration, open-loop stability affects performance and limits applications. First at all, this effect has been analyzed and a feedback circuit with correctors has been proposed to improve stability performance. Then a simulation study is proposed to examine the influence of the system parameters on the corrector constants. The results of the simulation show that if the system parameters change the constants Kp, Ki and Kd of the PID corrector must be adjusted to keep an optimized dynamic response.

Monitoring of solenoid parameters based on neural networks and optical fiber squeezer for solenoid valves diagnosis

“…However, as stated in some previous works [15,16], the EMS dynamic in these devices is governed by an electromagnetic force that increases greatly when the air gap is near zero. This nonlinear behavior, together with physical bounds that limit the motion, causes EMS of valves to be subject to strong shocks and wear that often result in early failures [17], these failures, which affects the dynamic response [18], may be due to a fluctuation in the EMS structure parameters [19] or the electrical and mechanical parameters of the EMS (variations in inductance and resistor of the coil, changes in spring constant and coefficient of friction) [20,21]. Other studies have shown a deterioration in the performance of EMS based system in presence of parametric variation [12,13], even for the best control solutions [20].…”