Automatic Gain Control of EDFAs Using DSP

The recent development in automatic gain control (AGC) of Er-doped fiber amplifier (EDFA) based on the electrical feedback is reviewed briefly. We introduce a AGC method which uses the adaptive PID arithmetic with feedforward to realize gain clamping by automatically optimizing. The experimental results show that the AGC scheme based on DSP has the advantages of relatively low cost ,high reliability and good flexibility due to the potential of using different arithmetic.

Design of Fuzzy PID Controller for Water Level of Boiler Steam Drum Based on DSP

A control system for water level of boiler steam drum based on DSP microprocessor is designed in this paper. The technique of fuzzy control was applied to controlling the water level of the steam drum, the operational principle and application of the fuzzy-PID arithmetic are described. The water level controller with good control effect is developed. Firstly the hardware structure of system is introduced in the paper and then investigates the fuzzy-PID arithmetic carry out, and finally, the simplified program flowchart are given.