Design Of Embedded Control System Of MOPA Fiber Laser

With the development of industrial technology and the improvement of process requirements,pulsed fiber lasers have been widely used in precision machining,intelligent manufacturing and other fields due to their excellent processing performance.Among them,the fiber laser based on the MOPA(Master Oscillator Power Amplifier)structure is widely studied because it can obtain an optical signal whose frequency and pulse width can be modulated by operating a pulsed electrical signal.The paper analyzes the research status of fiber lasers at home and abroad,clarifies the importance of the seed source module as the core device of the MOPA fiber laser,and develops the following research around the circuit control system of the seed source: 1)The modular design of MOPA fiber laser control system,the functions and responsibilities of each module and the relationship between them are analyzed,and core functional devices of each module are determined.2)Design the driving circuit of the seed source includes building a digital circuit to generate pulse electrical signals and a seed source temperature control system with processor and driver chip as the core.3)The temperature control model of the seed source is established.Control effects of the classic PID(Proportional–Integral–Derivative)controller and the fuzzy PID controller are simulated and the latter has better performance.The design process of the fuzzy controller is explained in detail,and the corresponding microcontroller drivers is written based on the fuzzy algorithm.4)Design the temperature,light,humidity detection circuit,which can detect the phenomenon of temperature overload and light leakage inside the laser in real-time.Design the upper computer software of the detection module,receive and display serial communication data,and at the same time be able to modify the hardware circuit parameters through the upper computer to simplify the operation and debugging of the laser.In this paper,two pulse electrical signals are obtained through the design of the hardware description language,and a narrow pulse electrical signal with a pulse width of nanoseconds is generated through logical processing.The simulation results of the seed source temperature control model verify that the fuzzy PID controller can speed up the response and improve the control accuracy of the system.The interface and detection circuit enhance the laser's self-protection ability and make the working environment more stable.