[1] Essiambre R J, Kramer G, Winzer P J, et al.. Capacity limits of optical fiber networks[J]. J Lightwave Technol, 2010, 28(4): 662-701.
[2] Ryf R, Randel S, Gnauck A H, et al.. Space-division multiplexing over 10 km of three-mode fiber using coherent 6×6 MIMO processing[C]. Optical Fiber Communication Conference, Optical Society of America, 2011: PDPB10.
[3] Xie Yiwei, Fu Songnian, Zhang Hailiang, et al.. Design and optimization of mode differential group delay for few-mode fiber [J]. Acta Optica Sinica, 2013, 33(9): 0906010.
[4] Zhu B, Taunay T F, Yan M F, et al.. Seven-core multicore fiber transmissions for passive optical network[J]. Opt Express, 2010, 18(11): 11117-11122.
[5] Zhang Kewei, Zhao Wei, Xie Xiaoping, et al.. Experimental research of high gain and low noise figure optical amplifier based on Erbium-doped fiber[J]. Acta Optica Sinica, 2013, 33(5): 0506003.
[6] Ho K P, Kahn J M. Mode-dependent loss and gain: Statistics and effect on mode-division multiplexing[J]. Opt Express, 2011, 19(17): 16612-16635.
[7] Akhtari S, Krummrich P M. Optical amplifier with rotationally symmetrical pump modes for enhanced mode multiplexing [J]. IEEE Photon Technol Lett, 2012, 24(23): 2097-2100.
[8] Kang Q, Lim E L, Jung Y, et al.. Accurate modal gain control in a multimode erbium doped fiber amplifier incorporating ring doping and a simple LP01 pump configuration[J]. Opt Express, 2012, 20(19): 20835-20843.
[9] Bai N, Ip E, Wang T, et al.. Multimode fiber amplifier with tunable modal gain using a reconfigurable multimode pump[J]. Opt Express, 2011, 19(17): 16601-16611.
[10] Ip E. Gain equalization for few-mode fiber amplifiers beyond two propagating mode groups[J]. IEEE Photon Technol Lett, 2012, 24(21): 1933-1936.
[11] Kang Q, Lim E, Poletti F, et al.. Minimizing differential modal gain in cladding pumped MM- EDFAs for mode division multiplexing in C and L bands[C]. Fiber- Based Technologies and Applications, Optical Society of America, 2014: FTh4F1.
[12] Jung Y, Lim E L, Kang Q, et al.. Cladding pumped few-mode EDFA for mode division multiplexed transmission[J]. Opt Express, 2014, 22(23): 29008-29013.
[13] Barnes W L, Laming R, Tarbox E J, et al.. Absorption and emission cross section of Er3+ doped silica fibers[J]. IEEE J Quantum Elect, 1991, 27(4): 1004-1010.
[14] Giles C R, Desurvire E. Modeling erbium-doped fiber amplifiers[J]. J Lightwave Technol, 1991, 9(2): 271-283.
[15] Jung Y, Alam S, Li Z, et al.. First demonstration and detailed characterization of a multimode amplifier for space division multiplexed transmission systems[J]. Opt Express, 2011, 19(26): B952-B957.
[16] Deb K, Pratap A, Agarwal S, et al.. A fast and elitist multiobjective genetic algorithm: NSGA-II[J]. IEEE Trans on Evolut Comput, 2002, 6(2): 182-197.