Current Optics and Photonics

Optical Society of Korea (한국광학회)
권호 표지
DOI QR코드

DOI QR Code

Real-time Adaptive Polarization Control in a Non-PM Fiber Amplifier

  • Kyuhong, Choi (Advanced Photonics Research Institute, Gwangju Institute of Science and Technology) ;
  • Jinju, Kim (Advanced Photonics Research Institute, Gwangju Institute of Science and Technology) ;
  • Dal Yong, Lee (Advanced Photonics Research Institute, Gwangju Institute of Science and Technology) ;
  • Changsu, Jun (Advanced Photonics Research Institute, Gwangju Institute of Science and Technology)
  • Received : 2022.11.17
  • Accepted : 2023.01.09
  • Published : 2023.02.25
Download PDF
⟨ Previous Next ⟩

Abstract

Real-time adaptive control of laser output polarization is presented in a 10-W-level non-polarization-maintaining (non-PM) fiber amplifier. While the output polarization from a non-PM fiber amplifier tends to be irregular, depending on output power, time, and perturbation, closed-loop polarization control can maintain the polarization extinction ratio at higher than 20 dB. Real-time polarization control can attain the target linear polarization mostly within 1.4-25 ms and shows stability against external perturbations. This approach can satisfy both linear polarization and high output power in a non-PM amplifier, and facilitates optimization of laser performance and maintenance-free operation.

Keywords

Acknowledgement

Gwangju Institute of Science and Technology (GK14720, GK15430, GK15320).

References

  1. R. Su, B. Yang, X. Xi, P. Zhou, X. Wang, Y. Ma, X. Xu, and J. Chen, "500 W level MOPA laser with switchable output modes based on active control," Opt. Express 25, 23275-23282 (2017). https://doi.org/10.1364/OE.25.023275
  2. L. Huang, J. Leng, P. Zhou, S. Guo, H. Lu, and X. Cheng, "Adaptive mode control of a few-mode fiber by real-time mode decomposition," Opt. Express 23, 28082-28090 (2015). https://doi.org/10.1364/OE.23.028082
  3. G. Genty, L. Salmela, J. M. Dudley, D. Brunner, A. Kokhanovskiy, S. Kobtsev, and S. K. Turitsyn, "Machine learning and applications in ultrafast photonics," Nat. Photonics 15, 91-101 (2021). https://doi.org/10.1038/s41566-020-00716-4
  4. G. D. Goodno, S. J. McNaught, J. E. Rothenberg, T. S. McComb, P. A. Thielen, M. G. Wickham, and M. E. Weber, "Active phase and polarization locking of a 14 kW fiber amplifier," Opt. Lett. 35, 1542-1544 (2010). https://doi.org/10.1364/OL.35.001542
  5. Z. Huang, C. Liu, J. Li, D. Zhang, H. Cheng, Y. Luo, Q. Hu, and M. Han, "Fiber polarization control based on a fast locating algorithm," Appl. Opt. 52, 6663-6668 (2013). https://doi.org/10.1364/AO.52.006663
  6. Y. Wang, Y. Feng, X. Wang, H. Yan, J. Peng, W. Peng, Y. Sun, Y. Ma, and C. Tang, "6.5 GHz linearly polarized kilowatt fiber amplifier based on active polarization control," Appl. Opt. 56, 2760-2765 (2017). https://doi.org/10.1364/AO.56.002760
  7. R. Su, Y. Liu, B. Yang, P. Ma, X. Wang, P. Zhou, and X. Xu, "Active polarization control of a 1.43 kW narrow linewidth fiber amplifier based on SPGD algorithm," J. Opt. 19, 045802 (2017).
  8. P. Ahmadi, D. Creeden, D. Aschaffenburg, V. Mokan, M. Underwood, A. Caprara, Q.-Z. Shu, L. Spinelli, J. Minelly, and I. Nikolov, "Generating kW laser light at 532 nm via second harmonic generation of a high power Yb-doped fiber amplifier," Proc. SPIE 11264, 1126414 (2020).
  9. R. Tao, P. Ma, X. Wang, P. Zhou, and Z. Liu, "Comparison of the threshold of thermal-induced mode instabilities in polarization-maintaining and non-polarization-maintaining active fibers," J. Opt. 18, 065501 (2016).
  10. R. Tao, R. Su, P. Ma, X. Wang, and P. Zhou, "Suppressing mode instabilities by optimizing the fiber coiling methods," Laser Phys. Lett. 14, 025101 (2017).
  11. E. Ronnekleiv, M. N. Zervas, and J. T. Kringlebotn, "Modeling of polarization-mode competition in fiber DFB lasers," IEEE J. Quantum Electron. 34, 1559-1569 (1998). https://doi.org/10.1109/3.709571
  12. M. N. Zervas, R. Wilmshurst, and L. M. B. Walker, "Twisted hi-bi fiber distributed-feedback lasers with controllable output state of polarization," Opt. Lett. 38, 1533-1535 (2013). https://doi.org/10.1364/OL.38.001533
  13. N. Moroney, L. Del Bino, S. Zhang, M. T. M. Woodley, L. Hill, T. Wildi, V. J. Wittwer, T. Sudmeyer, G.-L. Oppo, M. R. Vanner, V. Brasch, T. Herr, and P. Del'Haye, "A Kerr polarization controller," Nat. Commun. 13, 398 (2022).
  14. Y. LeCun, L. Bottou, Y. Bengio, and P. Ha, "Gradient-based learning applied to document recognition," Proc. IEEE 86, 2278-2324 (1998). https://doi.org/10.1109/5.726791