[2] Islam M N. Raman amplifiers for telecommunications [J]. Journal of Selected Topics in Quantum Electronics, 2002, 8(3): 548-559.
[9] Rekas M, Zimer H, Tünnermann A. Over 200 W average power tunable Raman amplifier based on fused silica step index fiber [J]. Appl. Phys. B, 2012, 107: 711-716.
[10] Chestnut D A, Dematos C J S, Reeves-hall P C, et al. High efficiency, dual-wavelength fibre Raman pump laser for U-band fibre Raman amplifiers [J]. Optical Quantum Electronics Letters, 2002, 34: 1025-1030.