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Chin. Opt. Lett.
 Home  List of Issues    Issue 12 , Vol. 16 , 2018    10.3788/COL201816.121404


All-polarization-maintaining figure-eight Er-fiber ultrafast laser with a bidirectional output coupler in the loss-imbalanced nonlinear optical loop mirror
Junkai Shi1, Yao Li1, Shuyuan Gao1, Yingling Pan1, Guoming Wang1, Rongyi Ji1, and Weihu Zhou1;2
1 Laboratory of Laser Measurement Technology, [Academy of Opto-Electronics, Chinese Academy of Sciences], Beijing 100094, China
2 [University of Chinese Academy of Sciences], Beijing 100049, China

Chin. Opt. Lett., 2018, 16(12): pp.121404

DOI:10.3788/COL201816.121404
Topic:Lasers and laser optics
Keywords(OCIS Code): 140.3510  140.4050  140.7090  

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 all-polarization-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.

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Received:2018/9/3
Accepted:2018/11/1
Posted online:2018/11/27

Get Citation: Junkai Shi, Yao Li, Shuyuan Gao, Yingling Pan, Guoming Wang, Rongyi Ji, and Weihu Zhou, "All-polarization-maintaining figure-eight Er-fiber ultrafast laser with a bidirectional output coupler in the loss-imbalanced nonlinear optical loop mirror," Chin. Opt. Lett. 16(12), 121404(2018)

Note: This work was supported by the Key Project of Bureau of International Cooperation, Chinese Academy of Sciences (No. 181811KYSB20160029) and the Key Research Project of Bureau of Frontier Sciences and Education, Chinese Academy of Sciences (No. QYZDY-SSW-JSC008).



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