KEYWORDS: Control systems, Semiconductor lasers, Microcontrollers, Temperature metrology, Signal detection, Temperature sensors, Light sources, Laser stabilization, Digital electronics, Optical amplifiers
The temperature greatly influences the characteristics of external cavity laser diode (ECLD). The high accurate temperature control of ECLD is one of the pivotal technologies of stable output wavelength. In this paper, the principle and method for high accurate temperature control of ECLD are described. The scheme of bistable temperature control is given, which is combined by the analog circuit with PID control theory and the digital circuit design based on microcontroller, and it is studied and analyzed.
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.
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.
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