Analysis of widely wavelength tunable femtosecond soliton pulse generationusing optical fibers

Characteristics of wavelength-tunable femtosecond (fs) soliton pulse genera tion using optical fibers in a negative dispersion region are investigated both experimentally and numerically. The extended nonlinear Schrodinger equ ation, in which the wavelength-dependence of parameters is considered, is u sed to analyze the characteristics of widely wavelength-tunable soliton pul ses. The wavelength of the soliton pulse can be almost linearly shifted fro m 1.56-1.86 mu m for a 220 m fiber merely by varying the fiber-input power. Ideal mono-colored fs soliton pulses of 90-300 fs are generated stably, an d the generated pulses are nearly transform-limited fundamental soliton pul ses. The numerical results fit the experimental ones well. The numerical an alysis revealed that the wavelength of the soliton pulse can be shifted up to 2.2 mu m in this system.