Study on the Influence of Nonlinear Effect on Pulse Trapping in Photonic Crystal Fiber

Abstract

Based on the nonlinear Schrödinger equations which can satisfy the optical pulses transmission in photonic crystal fiber, it is numerically simulated the pulse t rapping courses between the pump pulse in negative dispersion region and the signal pulse in positive dispersion region using step by step Fourier method, and the effect the nonlinear coefficient to the trapping course. The result shows if the nonlinear coefficient is small, the pulse trapping cant realize. Conversely, if the nonlinear coefficient increases, the cross phase modulation between the two pulses is enhanced and the frequency shifts are intensified too. When the group velocity is matched, the pulse trapping is realized. And the degree of trapping is strength accompany with the nonlinear coefficient increasing.