With the development of science and technology, all teachers in the college will face how to stimulate the undergraduate student’s ability and make them to be an excellent engineer. For solving these questions, a new scheme with three steps has been designed. First, students will participate in the class teaching activity not only teacher. It will encourage them to read many extracurricular books and articles. Second, they will be required to think and design more new experiments after complete all experiment about the textbook and join more competition of the innovation and entrepreneurship. Third, some students who have more time and ability can early enter into his advisor professor’s lab to join various science and technology project. By this scheme, it will be realized to improve student’s innovation ability and be a brilliant engineer.
This letter reports the low noise control and wavelength shift of a commercial fixed-wavelength high-power DFB laser emitting at 785 nm. In this control system, a novel current driving module integrated with PID temperature controller is designed to provide precise injection current and stable operating temperature. The start- up and stop characteristic of this system is improved as well, to optimize output response and extend service life of the DFB laser. Experimental results show that the optical output power can be accurately controlled in the range of 0 to 600 mW, with the stability better than 2 ‰. In addition, we could effectively control the center wavelength from 785 nm to 793 nm maintaining the linewidth less than 0.9 nm. The research will enhance the performance and extend the use of present commercial DFB laser.