基于级联多模布拉格光栅和高精细度滤波器的可调谐双波长窄线宽掺铒光纤激光器
Switchable narrow line-width dual-wavelength erbium-doped fiber laser using cascaded multi-mode Bragg gratings and high fineness filter
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摘要: 提出了一个基于级联多模布拉格光栅和新型的高精细度滤波器的可调谐双波长窄线宽掺铒光纤激光器的结构。环形滤波器由两个耦合器和一段经过泵浦的掺铒光纤组成,由于掺铒光纤产生增益,滤波器产生高精细度的频率响应,能够滤掉掺铒光纤激光器的不需要的纵模,从而起到窄化激光器线宽的作用。实验过程中,由多模光栅的选频特性产生六种窄线宽双波长的组合,激光器的线宽由不加滤波器的0.14~0.16 nm 被压窄窄化到0.05 nm。Abstract: A switchable narrow line-width dual-wavelength erbium-doped fiber laser using cascaded multi- mode Bragg gratings incorporating a novel high-finesse ring filter was proposed and demonstrated. The ring filter was a ring filter composed of two optical couplers and a section erbium-doped fiber. Thanks to the gain generated by the erbium-doped fiber, the ring filter has a high fineness spectral. The incorpora- tion of the ring filter led to the suppression of undesirable modes in the dual-wavelength erbium-doped fiber laser (EDFL). An experiment was carried out, in which six kinds of narrow line-width dual-wave- lengths combination were generated. And 3 dB linewidth of each wavelength of 0.14 nm to 0.16 nm without the filter was narrowed to 0.05 nm with the high fineness filter.
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