可调谐激光器在光纤传感和光纤通信中有着广泛的应用，引起了人们的广泛重视。设计并搭建了基于FFP-TF2滤波器的可调谐激光器系统。通过FPGA设计的基于DDS (direct digital frequency synthesis)函数信号发生器与模拟放大电路结合产生的驱动电压，调节FFP-TF2腔长的变化，进而改变激光器的输出波长。该系统可以实现对FFP-TF2单点电压和扫描电压的驱动，从而激光器可以输出单波长激光和多波长扫描激光，在激光器输出波长1 532 nm~1 568 nm范围内，可以调节单波长输出，也可以调节多波长扫描范围，且两种模式可以切换使用。实验结果表明，激光器输出3 dB线宽基本保持在0.01 nm左右，激光器输出中心波长与驱动电压线性拟合度为99.934%，灵敏度为3.915 nm/V，而FFP-TF2输出中心波长与驱动电压线性拟合度为99.986%，灵敏度为4.021 nm/V，激光器输出中心波长相对FFP-TF2的误差为2.6%，说明该激光器系统输出波长具有线宽窄、稳定性好、灵活性高等优点。

Tunable lasers are widely used in optical fiber sensing and optical fiber communications, which have attracted extensive attention. A tunable laser system based on FFP-TF2 filter was designed and built. The driving voltage generated by the DDS(direct digital frequency synthesis) function signal generator and the analog amplifying circuit designed by the FPGA was adjusted to change the cavity length of the FFP-TF2, thereby changing the output of the laser wavelength. This system could drive the single point voltage and scanning voltage of FFP-TF2, so that the single-wavelength laser and the multi-wavelength scanning laser could be output by laser. In the laser output wavelength range of 1 532 nm to 1 568 nm, the single-wavelength output and the multi-wavelength scanning range could be adjusted, and the two modes could be switched. Experimental results show that the 3 dB linewidth of the laser output is kept at about 0.01 nm, the linear fitting degree of the laser output center wavelength and the driving voltage is 99.934%, the sensitivity is 3.915 nm/V, while the linear fitting degree of the FFP-TF2 output center wavelength and the driving voltage is 99.986%, the sensitivity is 4.021 nm/V. And the error of the laser output center wavelength relative to FFP-TF2 is 2.6%, which indicates that the laser system output wavelength has the advantages of narrow line width, good stability and high flexibility.