Multiwavelength switchable erbium-doped fiber laser is demonstrated by using a digital micromirror device (DMD) as an optical filter and wavelength-dependent variable optical attenuator. The spectrum can be switched from single to multiwavelength lasing output by simple adjustment of the DMD reflection pattern. The mode competition in a fiber ring is efficiently suppressed by finely modulating the reflection column to balance the diffraction loss and EDF gain on each wavelength. The results show the 3 dB-bandwidth of multiwavelength lasing signal is less than 0.06 nm and the side mode suppression ratio is greater than 35 dB. The peak power fluctuation is less than 0.8 dB, and the wavelength drift is less than 0.06 nm over 50 min. The multiwavelength generation from the DMD-based tunable fiber laser is stable, flexible and fast.

多波长可切换掺铒光纤激光器通过使用数字微镜器件 (DMD) 作为滤光器和波长相关可变光衰减器进行演示。通过简单调整 DMD 反射模式，光谱可以从单波长激光输出切换到多波长激光输出。通过精细调制反射柱以平衡每个波长的衍射损耗和 EDF 增益，可以有效抑制光纤环中的模式竞争。结果表明，多波长激光信号的3 dB带宽小于0.06 nm，边模抑制比大于35 dB。在50分钟内，峰值功率波动小于0.8 dB，波长漂移小于0.06 nm。基于 DMD 的可调谐光纤激光器产生的多波长稳定、灵活且快速。