[1] [1] Duan Kailiang, Zhao Baoyin, Zhao Wei, et al.. 1000 W all fiber laser[J]. Chinese J Lasers, 2009, 36(12): 3219.

[2] [2] Yan Ping, Xiao Qirong, Fu Chen, et al.. 1.6 kW Yb-doped all-fiber laser[J]. Chinese J Lasers, 2012, 39(4): 0416001.

[3] [3] Dai Shoujun, He Bing, Zhou Jun, et al.. 1.5 kW near single-mode all-fiber laser[J]. Chinese J Lasers, 2013, 40(7): 0702001.

[4] [4] Ou Pan, Yan Ping, Gong Mali, et al.. Fused side-coupler for double-clad fiber lasers[J]. Laser Technology, 2008, 32(1): 8-10.

[5] [5] Cesar Jauregui, Steffen Bohme, Georgios Wenetiadis, et al.. Side-pump combiner for all-fiber monolithic fiber lasers and amplifiers[J]. J Opt Soc Am B, 2010, 27(5): 1011-1015.

[6] [6] Li Ruichen, Zhang Peng, Pang Lu, et al.. Fused biconical taper side-pumped fiber coupler[J]. Journal of Applied Optics, 2011, 32(3): 522-525.

[7] [7] Thomas Theeg, Hakan Sayinc, Jorg Neumann, et al.. Pump and signal combiner for bi-directional pumping of all-fiber lasers and amplifiers[J]. Optics Express, 2012, 20(27): 28125-28140.