Modulation instability induced by periodic power variation in soliton fiber ring lasers Z. C. Luo, W. C. Xu, C. X. Song, A. P. Luo and W. C. Chen Eur. Phys. J. D, 54 3 (2009) 693-697 Published online: 06 June 2009 DOI: 10.1140/epjd/e2009-00164-y