Current source laser diode driver circuit and photo detector amplification and rectification circuit with wide dynamic range have been designed and implemented on the network interface card, automatic power control of the laser diode has been achieved. 在链路的网络接口卡上设计和实现了激光器的电流源驱动电路以及具有宽动态范围的光电探测器放大整形电路,实现了激光器的自动功率保护。