掺铒光纤中的双稳态现象的研究

Bistability Phenomenon in Erbium-Doped Fiber

在以掺铒光纤为增益介质的环形光纤激光器中观察到了光学双稳态现象,定性分析了双稳态形成的机理,即掺铒光纤不同位置分别存在增益饱和和吸收饱和,而且吸收饱和有着更低的饱和阈值。通过理论衍生的公式对增益特性曲线进行了拟合,并结合增益特性曲线对光双稳态的产生给出了定量的解释。

Optical bistability is observed in a fiber ring laser with erbium-doped fiber （EDF） as the gain medium. A qualitative explanation about the mechanism of optical bistahility is put forward, i.e. the long erbium-doped fiber can be divided into two different parts, where gain saturation and absorption saturation prevails respectively and the absorption saturation has a lower saturation threshold. Furthermore, the gain characteristic of EDF is measured and fitted with a formula derived from the qualitative explanation. At last, a quantitative explanation of the optical bistability is put forward with the gain characteristic of the erbium-doped fiber.