A switchable and tunable erbium-doped fiber laser with a linear cavity based on fiber Bragg gratings embedded in Sagnac rings is proposed and experimentally verified. Due to the stress birefringence effect and the polarized hole burning effect, which are introduced into the single-mode fiber in the polarization controllers (PCs) by the PCs, the designed laser can achieve seven kinds of laser-states output including three kinds of single-wavelength laser states, three kinds of dual-wavelength laser states and one kind of triple-wavelength laser state. The optical signal-to-noise ratios of the output wavelengths are all higher than 52 dB, and the wavelength shifts are all less than 0.04 nm. Furthermore, the temperature tuning of the wavelength range is also researched, which is about 1.2 nm. Due to advantages, such as low cost, simple structure, easy switching and multiple laser states, the designed laser has great application potential in laser radar, optical fiber sensing and so on.

提出了一种基于嵌入萨格纳克环的光纤布拉格光栅的线性腔的可切换和可调谐掺铒光纤激光器，并进行了实验验证。由于PCs将应力双折射效应和偏振烧孔效应引入到偏振控制器（PCs）中的单模光纤中，设计的激光器可以实现七种激光态输出，包括三种单模态。 -波长激光态，三种双波长激光态和一种三波长激光态。输出波长的光信噪比均高于52 dB，波长漂移均小于0.04 nm。此外，还研究了波长范围的温度调谐，约为1.2 nm。由于成本低、结构简单、