Self-phase modulation effects and pulse propagation in gain-guided fibersRenjie Zhou, Baldemar Ibarra-Escamilla, Qiwen Zhan, Peter E. Powers and Joseph W. HausJ. Eur. Opt. Soc.-Rapid Publ., 4 (2009) 09051DOI: https://doi.org/10.2971/jeos.2009.09051