Key Technology Research On Dense Wavelength-Division Multiplexer Source

With the development of society and economy, the capability of the information system grows day by day. Optical fiber communication, which is extensive used in the development of informatization, becomes the most important technology after the microelectronic technique. DWDM (Dense Wavelength Division Multiplexing) is the most important technology which enhances the capability of the optical fiber communication system. With the development of communication system capability, the channels of the DWDM system are geminated and the capability of every channel grows gradually. All of these require the DWDM source output has high precision and stability.The key techniques of the DWDM source design are discussed. With these techniques and the practical situation, we select a scheme. This scheme based on control model of the LD (laser diode) module. And the study keystone is the hybrid control technique of DWDM source.Based on the rate equation and the temperature characteristic of the LD, the temperature control object model and the temperature control error of DFB-LD are analyzed. Then the power and wavelength output characteristic is farther analyzed. The test system, whose core is the LD parameter test instrument designed by ourselves, is established to validate the control model.Based on the temperature control object model of the LD module and the running characteristic of the DWDM source are analyzed, the temperature control system of the DWDM source is designed. In this system, the soft hardware complex-compensate technique is adopted to enhance the precision of temperature control, the analog PI controller, whose parameters are adjusted by analog fuzzy controller, is designed to enhance the stationary response. To restrain the time-delay of the startup phase of the temperature and improve the response speed, the fuzzy-PI controller with predictive control is adopted to the startup phase. This control mode can decrease the system overshoot and ensure the system rapidity. The predictive control can restrain the time-delay of the controlled object.On the high precision and stability temperature control system and the...