中文摘要：

依据积分分离式PID控制原理，设计了基于PID控制技术和FPGA的高精度宽带增益平坦的拉曼放大器（RFA）。激光器驱动电流控制精度为0．1mA，系统温漂小于±25mK，实现泵浦激光器24h波长漂移小于±0．02nm。依据遗传算法，采用5波长大功率LD后向泵浦和100．8km色散位移光纤（DSF），实现了带宽为90m、增益平坦度为0．87dB的拉曼放大。

英文摘要：

The temperature control system that is designed according to integral separate PID control system is discussed. In this letter,the high accurate temperature control and power control modular is optimized based on PID control technique and FPGA. The control accurate of laser driver current is 0. 1 mA. The temperature drift in the thermostat is less than ± 25 mK. Within 24 h,the wavelength shift is less than ±0. 02 nm. Based on genetic algorithm,using 5 high power LD respectively,as the multi-pumps,a wideband distributed Raman fiber amplifier（1 520 to 1 610 nm） with gain flatness of 0.87 dB was obtained based on backward pump scheme and 100.8 km DSF.