[1] Serkin V N, Hasegawa A. Exactly integrable nonlinear Schr dinger equation models with varying dispersion, nonlinearity and gain: application for soliton dispersion managements [J]. IEEE Journal of Selected Topics in Quantum Electronics, 2002, 8(3): 418-431.

[2] Kruglov V I, Peacock A C, Harvey J D. Exact self-similar solutions of the generalized nonlinear Schr dinger equation with distributed coefficients [J]. Phys. Rev. Lett., 2003, 90(11): 113902(1-4).

[3] Stratmann M, Pagel T, Mitschke F. Experimental observation of temporal soliton molecules [J]. Phys. Rev. Lett., 2005, 95 (14): 143902(1-4).

[4] Hao Ruiyu, Li Lu, Yang Rongcao, et al. Exact chirped multi-soliton solutions of the nonlinear Schr dinger equation with varying coefficients [J]. Chin. Opt. Lett., 2005, 3(3): 136-139 (in Chinese).

[5] Hao Ruiyu, Zhou Guosheng. Propagation of light in (2+1)-dimensional nonlinear optical media with spatially inhomogeneous nonlinearities [J]. Chin. Opt. Lett., 2008, (3): 211-213.

[7] Chiao R Y, Garmire E, Townes C H. Self-trapping of optical beams [J]. Phys. Rev. Lett., 1964, 13(15): 479-482.

[8] Aitchison J S, Weiner A M, Silberberg Y, et al. Observation of spatial optical solitons in a nonlinear glass waveguide [J]. Opt. Lett., 1990, 15(9): 471-473.

[9] Kelley P L. Self-focusing of optical beams [J]. Phys. Rev. Lett., 1965, 15(26): 1005-1008.

[10] Reitze D H, Weiner A M, et al. High-power femtosecond optical pulse compression by using spatial solitons [J]. Opt. Lett., 1991, 16(18): 1409-1411.

[11] Baluschev S, Dreischuh A, Velchev I, et al. Generation and evolution of two-dimensional dark spatial solitons [J]. Phys. Rev. E, 1995, 52(5): 5517-5523.

[12] Ren Ji, Ruan Hangyu. Exact solutions to nonlinear Schr dinger equation and higher-order nonlinear Schr dinger equation [J]. Commun. Theor. Phys., 2008, 50(3): 575-578.