Volume 12 Issue 4
Aug.  2019
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SHI Jun-kai, WANG Guo-ming, JI Rong-yi, ZHOU Wei-hu. Compact dual-wavelength continuous-wave Er-doped fiber laser[J]. Chinese Optics, 2019, 12(4): 810-819. doi: 10.3788/CO.20191204.0810
Citation: SHI Jun-kai, WANG Guo-ming, JI Rong-yi, ZHOU Wei-hu. Compact dual-wavelength continuous-wave Er-doped fiber laser[J]. Chinese Optics, 2019, 12(4): 810-819. doi: 10.3788/CO.20191204.0810

Compact dual-wavelength continuous-wave Er-doped fiber laser

doi: 10.3788/CO.20191204.0810
Funds:

the Key Project of Bureau of International Cooperation, Chinese Academy of Sciences 181811KYSB20160029

the Key Research Project of Bureau of Frontier Sciences and Education, Chinese Academy of Sciences QYZDY-SSW-JSC008

More Information
  • Corresponding author: ZHOU Wei-hu, E-mail:zhouweihu@aoe.ac.cn
  • Received Date: 21 Sep 2018
  • Rev Recd Date: 16 Nov 2018
  • Publish Date: 01 Aug 2019
  • Multiwavelength erbium-doped fiber lasers can be applied to many fields, such as wavelength division multiplexing optical communication and others attracting considerable attention. To meet the requirements of different applications, we propose a compact dual-wavelength continuous-wave erbium-doped fiber laser based on nonlinear amplifying loop mirror. An all-polarization-maintaining fiber cavity is adopted in which there are only three intracavity devices besides fiber itself:a wavelength division multiplexer, a 2×2 fiber coupler and a fiber reflector. The intensity-dependent loss effect induced by the nonlinear amplifying loop mirror is used to equalize the intensity in the cavity. The input laser with higher power suffers a higher loss than the one with lower power. This feature can be used to suppress mode competition and achieve stable multiwavelength oscillation. With a pump power of 260 mW, dual-wavelength erbium-doped fiber laser can be achieved, with wavelengths of 1 560.5 nm and 1 563.2 nm, respectively. The side-mode suppression ratio is 46.8 dB. As pump power increases, the laser can operate in single-, dual-and triple-wavelength regions in proper order. As the multi-wavelength lasing oscillation is a balance between intensity-dependent loss and mode competition, the intensity change breaks the original balance state, resulting in the change in number and wavelength of lasing lines. This laser is simply structured and easy to operate. It can have applications in many fields.

     

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