研究了一种新型、全光纤、宽带可调谐环形腔掺铒光纤激光器。该激光器利用由单模-多模-单模光纤组成的滤波器实现波长可调谐及激光器的全光纤结构。该滤波器将多模光纤缠绕在偏振控制器上,两端分别与一段单模光纤相连,通过调整偏振控制器的状态,实现了中心波长1542～1560nm的不同激光输出。单波长连续可调谐激光器的波长可调范围为18nm,边模抑制比大于40dB,3dB线宽为0.096nm;进一步调整偏振控制器的状态和抽运功率,实验同时得到了连续可调谐的双波长、三波长等多波长激光输出。对于可调谐的多波长激光器,通过调整偏振控制器的状态,可实现波长间隔及输出中心波长两者可调。 A new type of all-fiber, tunable broadband tunable erbium-doped fiber laser is studied. The laser utilizes a filter consisting of a single mode - multimode - single mode fiber to achieve a wavelength tunable and laser all fiber structure. The filter will be multi-mode fiber wound around the polarization controller, both ends of a single-mode fiber are connected, by adjusting the state of the polarization controller to achieve the center wavelength of 1542 ~ 1560nm different laser output. The wavelength tunable range of a single wavelength tunable laser is 18 nm, the side mode suppression ratio is more than 40 dB, and the 3dB linewidth is 0.096 nm. By further adjusting the state of the polarization controller and the pumping power, the experimentally obtained tunable dual wavelength , Three wavelength and other multi-wavelength laser output. For tunable multi-wavelength lasers, both the wavelength spacing and the output center wavelength can be adjusted by adjusting the state of the polarization controller.