In recent years, frequency stabilization technology of the external cavity laser diodes (ECLD) has developed rapidly. In this paper, an embedded system module that is adopted in the frequency stabilization circuit of ECLD is discussed, and an improved circuit of embedded system that is based on ARM core is presented. In this way, the reliability of frequency stabilization circuit system is increased, the power waste is reduced and the structure is simplified.
Frequency stabilization of laser diodes is of vital importance for the exploitation of optical frequency-division multiplexing coherent transmission systems and high-resolution optical measurement application. The research of frequency standard in 1.5μm region becomes one of hot orientations in optical communication area. The molecules absorption frequency stabilization technology of Fibre Bragg Grating external cavity laser diode (FBG ECLD) is studied intensively. To overcome the shortcoming of traditional PID control, self-organized and self-adapted algorithm based on predictive estimate modelling is used. The algorithm adopts indirectness arithmetic, which estimates and improves on the modelling according to a suitable learning speed and gains perfect control effects. The algorithm which is adopted in embedded system can achieve high-resolution frequency stabilization within 5min warm-up without manual work.
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