[1] [1] LIAW S K, DOU L, XU A S, et al. Optimally gain-flattened and dispersion-managed C+L-band hybrid amplifier using a single-wavelength-

          pump laser[J]. Optics Communications, 2009, 282(20): 4087-4090.

[2] [2] BESHR A H, ALY M H, ABOULSEOUD A K. New trend for optical signal-to-noise ratio of disturbed Raman fiber amplifier[J]. International Journal for Light and Electron Optics, 2014, 125(11): 2572-2576.

[6] [6] JOSE R, ARAI Y, OHISHI Y. Raman scattering characteristics of the TBSN-based tellurite glass system as a new Raman gain medium[J]. Journal of the Optical Society of America B: Optical Physics, 2007, 24(7): 1517-1526.

[7] [7] STEGEMAN R, JANKOVIC L, KIM H, et al. Tellurite glasses with peak absolute Raman gain coefficients up to 30 times that of fused silica[J]. Optics Letters, 2003, 28(13): 1126-1128.

[8] [8] GONG Jiamin, DING Zhe, LI Siping, et al. Multi-pumped tellurite based Raman fiber amplifier based on Gaussian fitting of gain spectrum[J]. Optical and Quantum Electronics, 2018, 50(6): 245-248.

[9] [9] GONG Jiamin. Stimulated Raman and Brillouin scattering effect in single-mode silica fiber in density wavelength division multiplexed optical communication system[D]. Xi’an: Xi’an Jiaotong University, 1999.

[10] [10] FENG Jianqiang, SUN Shiyi. The Principle and Application of Fourth-order Runge-Kutta Method[J]. Mathematics Learning and Research, 2017, 2017(17): 4-5.