The Design And Implement Of Stabilization Current Source And The Research Of Network Data Disaster Recovery System

My paper is including two parts: the design and implement of the external cavity laser diode (ECLD) current source and the research of network data disaster recovery system.The laser diode which is the key of external cavity laser diode (ECLD) is very tender part. It is easily damaged by the impact of the voltage, current and static when its assembly and running. To avoid the damage, the feedback constant current theory, low startup theory, low close up theory and MOS effect transistor specialty are applied to realize a new method of high-resolution constant current circuit, after some traditional methods used for reference. The new method is applied for the high-resolution external cavity semiconductor laser diode of the 1550nm wavelength to drive the current constantly. The resolution of drive circuit can be achieve in high level. The project is simulated by Protel DXP tool, designed by the PCB circuit, and applied to the laser driver circuit system, which has proved the constant current model can avoid the damage for drive current fluctuation availably.The second part is the task of China Netcom Group Lab. The important data, which includes operation data, finance data, client information data, and etc, is closely bound up with the future of all kinds of corporations. However some causes, including the technique and man-made, conduce to the accident about data losing, data-base assaulted. Accordingly, the remote data storage and disaster recovery project is designed for the data clients. The resolvent based on the network is preponderant to the traditional resolvent based on the mainframe and based on the storage.