Longhi Stefano
Istituto Nazionale per la Fisica della Materia, Dipartimento di Fisica, Politecnico di Milano, Piazza L. da Vinci, Milan 32 I-20133, Italy.
Opt Lett. 2003 Dec 1;28(23):2363-5. doi: 10.1364/ol.28.002363.
Beam propagation in multimode graded-index parabolic optical fibers in the presence of group-velocity dispersion and Kerr nonlinearity is theoretically investigated. It is shown that a modulational instability arising from the periodic spatial focusing of the beam takes place regardless of the sign of fiber dispersion, leading to a highly nonlinear space-time dynamics and the generation of ultrashort optical pulses.
对存在群速度色散和克尔非线性的多模渐变折射率抛物线型光纤中的光束传播进行了理论研究。结果表明，无论光纤色散的符号如何，由光束的周期性空间聚焦引起的调制不稳定性都会发生，从而导致高度非线性的时空动力学和超短光脉冲的产生。
