We analyze modulational instability (MI) of light waves in fiber systems with periodically varying dispersion. The dispersion fluctuation generates special waves, called nonconventional MI sidebands, which are shown to be highly sensitive to two fundamental system parameters. The first one is the average dispersion of the system. Surprisingly, the second parameter turns out to be the mean value of the dispersion coefficients of the two types of fibers of the system, which is then called “central dispersion.” These two parameters are used to control and optimize the MI process. In particular, we establish the existence of a critical region of the central dispersion at which the power gain of the nonconventional sidebands undergoes a dramatic enhancement.
© 2008 Optical Society of America
Original Manuscript: September 13, 2007
Revised Manuscript: November 27, 2007
Manuscript Accepted: December 13, 2007
Published: February 29, 2008
S. Ambomo, C. M. Ngabireng, P. Tchofo Dinda, A. Labruyère, K. Porsezian, and B. Kalithasan, "Critical behavior with dramatic enhancement of modulational instability gain in fiber systems with periodic variation dispersion," J. Opt. Soc. Am. B 25, 425-433 (2008)