Volume 13 Issue 5
Sep.  2020
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LIU Yi, GUO Rong-rong, YI Xiao-gang, ZHENG Yong-qiu, CHEN Peng-fei. Erbium-doped fiber amplifier gain-flatness of a Sagnac loop with an erbium-doped fiber[J]. Chinese Optics, 2020, 13(5): 988-994. doi: 10.37188/CO.2020-0064
Citation: LIU Yi, GUO Rong-rong, YI Xiao-gang, ZHENG Yong-qiu, CHEN Peng-fei. Erbium-doped fiber amplifier gain-flatness of a Sagnac loop with an erbium-doped fiber[J]. Chinese Optics, 2020, 13(5): 988-994. doi: 10.37188/CO.2020-0064

Erbium-doped fiber amplifier gain-flatness of a Sagnac loop with an erbium-doped fiber

doi: 10.37188/CO.2020-0064
Funds:  Supported by National Natural Science Foundation of China for Distinguished Young Scholars (No. 61705157, No. 61404140403, No.61805167); National Natural Science Foundation of China (No. 61975142, No. 61475112); Research Project Supported by Shanxi Scholarship Council of China (No. 2017-key-2); Key Research and Development (R&D) Projects of Shanxi Province (No. 201903D121124)
More Information
  • Corresponding author: liuyi28@163.com; liuyi28@163.com
  • Received Date: 21 Apr 2020
  • Rev Recd Date: 08 Jun 2020
  • Available Online: 15 Sep 2020
  • Publish Date: 05 Oct 2020
  • In order to achieve the simultaneous adjustment of multi-channel gain in the communications, especially in WDM, and to develop a wide range of stable light outputs in multi-wavelength fiber lasers, a research scheme of the erbium-doped fiber amplifier gain flattening characteristic at the transmission-port of a Sagnac loop with an unpumped erbium-doped fiber is proposed. The scheme is a combination of the self-resonance mode of the Sagnac loop, the absorption characteristics of unpumped erbium-doped fiber and the resonance mode caused by birefringence beat length in the loop. By adjusting the polarization controllers properly in the loop, the gain spectrum can be partially or completely flattened at the transmission port of the Sagnac loop. The results show that, on one hand, the part of the spectrum is flatted within ±0.145 dB in the wavelength range of 14 nm at the transmission port, but on the other hand, the total spectrum is flatted within ±1.225 dB over a bandwidth of 36.5 nm in the whole C-band at the transmission port. The gain spectrum flattening scheme has a simple structure and good flatness of the output spectrum. It is expected that this technology will be used in WDM systems and multi-wavelength lasers.

     

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