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All-polarization-maintaining figure-eight Er-fiber ultrafast laser with a bidirectional output coupler in the loss-imbalanced nonlinear optical loop mirror

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【作者】 石俊凯黎尧高书苑潘映伶王国名纪荣祎周维虎

【Author】 Junkai Shi;Yao Li;Shuyuan Gao;Yingling Pan;Guoming Wang;Rongyi Ji;Weihu Zhou;Laboratory of Laser Measurement Technology,Academy of Opto-Electronics,Chinese Academy of Sciences;University of Chinese Academy of Sciences;

【通讯作者】 周维虎;

【机构】 Laboratory of Laser Measurement Technology,Academy of Opto-Electronics,Chinese Academy of SciencesUniversity of Chinese Academy of Sciences

【摘要】 In this Letter, we report on a novel architecture for a self-starting mode-locked figure-eight erbium-doped fiber laser using a loss-imbalanced nonlinear optical loop mirror(NOLM) with a bidirectional output coupler. An allpolarization-maintaining structure is adopted. A 2 × 2 optical coupler with a splitting ratio of 50:50 is used at the junction to form an NOLM. Another coupler with a splitting ratio of 10:90 is introduced at one end of the fiber loop. The 10:90 coupler plays two roles: power attenuator and bidirectional output coupler. This architecture can achieve both large modulation depth and good self-starting ability simultaneously. With this architecture,the self-starting mode-locking operation is achieved easily with pump power above the threshold. The clockwise and counter-clockwise mode-locked output powers are 10.1 and 10.3 mW, respectively, with the repetition rate of3.63 MHz. The spectral bandwidths of the clockwise and counter-clockwise mode-locked output pulses are 7.4 and 2.9 nm, and the corresponding pulse widths of the direct outputs are 530.6 fs and 1.55 ps, respectively.

【Abstract】 In this Letter, we report on a novel architecture for a self-starting mode-locked figure-eight erbium-doped fiber laser using a loss-imbalanced nonlinear optical loop mirror(NOLM) with a bidirectional output coupler. An allpolarization-maintaining structure is adopted. A 2 × 2 optical coupler with a splitting ratio of 50:50 is used at the junction to form an NOLM. Another coupler with a splitting ratio of 10:90 is introduced at one end of the fiber loop. The 10:90 coupler plays two roles: power attenuator and bidirectional output coupler. This architecture can achieve both large modulation depth and good self-starting ability simultaneously. With this architecture,the self-starting mode-locking operation is achieved easily with pump power above the threshold. The clockwise and counter-clockwise mode-locked output powers are 10.1 and 10.3 mW, respectively, with the repetition rate of 3.63 MHz. The spectral bandwidths of the clockwise and counter-clockwise mode-locked output pulses are 7.4 and 2.9 nm, and the corresponding pulse widths of the direct outputs are 530.6 fs and 1.55 ps, respectively.

【关键词】 bidirectionalcouplerfiguremirrorlockedrepetitionstartingjunctionmaintainingcounter
【基金】 supported by the Key Project of Bureau of International Cooperation,Chinese Academy of Sciences(No.181811KYSB20160029);the Key Research Project of Bureau of Frontier Sciences and Education,Chinese Academy of Sciences(No.QYZDY-SSWJSC008)
  • 【文献出处】 Chinese Optics Letters ,中国光学快报(英文版) , 编辑部邮箱 ,2018年12期
  • 【分类号】TN248
  • 【被引频次】1
  • 【下载频次】49
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