Montian TIANPRATEEP, Junji TADA and Fumihiko KANNARI^*

Department of Electronics and Electrical Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan

(Received November 1, 2004; Accepted March 7, 2005)

We theoretically studied the influence of initial parameters of laser pulses, such as polarization, pulse shape and frequency chirp, on the broadening of spectrum during pulse propagation through microstructure fibers (MSFs). We utilized two coupled-mode equations based on the nonlinear Schrodinger equation using an intermediate-broadening model for a Raman response function, and the dispersion coefficients from 2nd to 7th orders for the slow and fast axes, respectively, of highly birefringent MSFs.

Key words: polarization, microstructure fibers, split-step Fourier method, ultrashort laser pulses, nonlinear optics

^*E-mail address: kannari@elec.keio.ac.jp