利用在腔内加入可调谐光纤光栅滤波器使“8”字形腔掺Yb3+光纤激光器在锁模状态下实现波长连续可调谐.实验中，在保证锁模状态稳定的情况下，通过调节可调谐光纤光栅滤波器，使激光器输出锁模脉冲的中心波长在1 047 nm～1 055 nm范围内连续调谐，重复频率稳定维持在4.9 MHz.在中心波长1 053 nm处，测得锁模脉冲输出平均功率为8.02 mW，光谱带宽1 nm，脉冲宽度为259.3 ps.这种“8”字形腔被动锁模光纤激光器在锁模状态下对波长连续可调谐，并可长时间稳定工作.

It was reported that Yb3+-doped fiber lasers with figure-of-eight cavity using the manual tunable fiber Bragg grating that can achieve wavelength continuous tuning in mode-locked operating.In the experiment,by adjusting the manual tunable fiber Bragg grating and control the transmission of the light through the filter band,the operating center wavelength of the fiber lasers could be tuned from 1 047 nm to 1 055 nm and pulse duration at a repetition rate of 4.9 MHz.The fiber laser could generate 8.02 mW output average power of 259.3 ps pulse duration when the operating center wavelength was at 1 053 nm and spectrum width was about 1 nm.The mode-locked fiber lasers can achieve wavelength continuous tuning in mode-locked operating and keep stable for a long time.