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Bias control of Mach-Zehnder electro-optic modulator is important for the performance of radio-over-fiber links. In this paper, a digital controller has been developed in order to keep the bias point at any target value, making the modulator exhibiting great long-term stability. Furthermore, this method was applied in radio-over-fiber links to optimize their performance, such as RF gain, noise figure,...
Modules have been widely used in development of various robots including re-configurable robots and snake-like robots. To build robotic systems more flexibly and quickly with low costs of manufacturing and maintenance, we have developed two basic types, which are called T-type and I-type, of robotic joint modules with one degree of freedom for general purpose. The modules are designed to be compact,...
The hysteresis nonlinearity and creep of the piezoceramic actuator are the main factors that affect its displacement output precision. The digital formula of the improved Preisach model, which aims at the hysteresis nonlinearity, is applied. According to the creep characteristic of the piezoceramic actuator, the data of its creep point are sampled to build the data table of Preisach model parameter...
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