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研究了一种全光纤可切换多波长掺铒光纤激光器。该激光器利用一段缠绕在压电陶瓷上的单模光纤作为正弦相位调制器以及基于光纤拉锥的马赫-曾德尔干涉仪作为梳状滤波器,抑制由于掺铒光纤的均匀展宽效应引起的模式竞争,从而避免了在室温下不稳定的单波长激射,实现了多波长掺铒光纤激光器的稳定输出。实验中观察到稳定的5个波长的同时激射,相邻波长间隔为0.804 nm。信噪比大于40 dB,3 dB带宽约为0.023 nm,中心5个波长输出功率的平坦度为14 dB。同时,激光器具有灵活的波长可切换特性,通过调整驱动信号和偏振控制器的状态,实现了单波长、双波长、三波长以及更多波长的输出。该激光器可应用于大容量波分复用系统和光纤传感。
An all-fiber switchable multi-wavelength erbium-doped fiber laser is studied. The laser uses a single-mode fiber wound on a piezoelectric ceramic as a sinusoidal phase modulator and a Mach-Zehnder interferometer based on a fiber taper as a comb filter to suppress the mode competition caused by the uniform broadening effect of the erbium-doped fiber , Thus avoiding the unstable single-wavelength lasing at room temperature and realizing the stable output of the multi-wavelength erbium-doped fiber laser. Simultaneous lasing of five stable wavelengths was observed in the experiment with adjacent wavelength intervals of 0.804 nm. The signal to noise ratio is greater than 40 dB, the 3 dB bandwidth is about 0.023 nm, and the flatness of the center five wavelengths is 14 dB. At the same time, the lasers have a flexible wavelength-switchable output that enables single-wavelength, dual-wavelength, triple-wavelength, and more wavelength output by adjusting the drive signal and the state of the polarization controller. The laser can be applied to large-capacity wavelength division multiplexing system and optical fiber sensing.