650 W All-Fiber Single-Frequency Polarization-Maintaining Fiber Amplifier Based on Hybrid Wavelength Pumping and Tapered Yb-Doped Fibers

• DOI: 10.3390/photonics9080518
• Publication Date: 2022-07-26T04:17:27Z
• Authors: Wanpeng Jiang; Changsheng Yang; Qilai Zhao; Quan Gu; Jiamin Huang; Kui Jiang; Kaijun Zhou; Zhouming Feng; Zhongmin Yang; Shanhui Xu
• Keywords: Extinction ratio

Based on hybrid wavelength pumping and tapered Yb-doped fibers (T-YDFs), a 650 W all-fiber single-frequency polarization-maintaining fiber amplifier was demonstrated experimentally at 1030 nm. Different pump power ratios in the T-YDF-based power-amplifier stage were proposed to investigate their influence transverse mode instability (TMI) effect. The highest TMI threshold obtained when ratio of 940 nm 976 1:4.4. A measured M2 factor 1.7 polarization extinction 14 dB maximum output obtained. To best our knowledge, these results exhibit any amplifiers created up now.