非線形光ファイバカプラによるフェムト秒パルスの全光スイッチング及び結合特性

概要

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We analyze numerically the propagation of ultra-short optical pulses in a nonlinear fiber directionalcoupler by taking into account the dispersion effect of the coupling coefficient in nonlinear regimes.From split-step Fourier analysis of coupled nonlinear Schrödinger equations it is found that the pulsebreakup occurs due to coupling coefficient dispersion. It is also demonstrated that the group velocitydispersion and its resultant pulse broadening dominate the switching behaviors of nonlineardirectional coupler. To clarify the effect of intermodal dispersion, ultra-short optical pulses of 50 fspulse duration from a mode-locked Ti:Sapphire laser are used. Comparing the experimental resultswith the numerical calculations, we can estimate the coupling coefficient dispersion provided thatappropriate parameters are given for a nonlinear fused-tapered coupler.
室蘭工業大学の論文
2004-11-30