We propose a simple design of all-fiber Q-switched erbium-doped fiber laser (EDFL). The laser is passively Q-switched by splicing bismuth-doped fiber into a ring cavity. The design has been experimentally demonstrated at the emission wavelength of 1560.48 nm. A single-mode Q-switched pulse with pulse duration of 1.18 μs and pulse energy of 15.6 nJ was obtained with 980 nm pump power of 178 mW. Stable and typical Q-switched pulses were achieved at the repetition rate changing from 63.3 to 94.6 kHz. To the best of our knowledge, it is the first time to demonstrate bismuth-doped fiber as an effective saturable absorber for erbium-doped fiber laser.

中文翻译：

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掺铒光纤激光器腔内掺铋光纤调Q器

我们提出了一种简单的全光纤调Q掺铒光纤激光器（EDFL）设计。通过将掺铋光纤拼接到环形腔中，对激光器进行被动调Q。该设计已在 1560.48 nm 的发射波长下进行了实验证明。获得了脉冲持续时间为 1.18 μs 和脉冲能量为 15.6 nJ 的单模 Q 开关脉冲，泵浦功率为 178 mW，为 980 nm。在 63.3 至 94.6 kHz 的重复率下实现了稳定和典型的 Q 开关脉冲。据我们所知，这是第一次证明掺铋光纤作为掺铒光纤激光器的有效可饱和吸收体。