Fermann M E, Kruglov V I, Thomsen B C, Dudley J M, Harvey J D
IMRA America, 1044 Woodridge Avenue, Ann Arbor, Michigan 48105, USA.
Phys Rev Lett. 2000 Jun 26;84(26 Pt 1):6010-3. doi: 10.1103/PhysRevLett.84.6010.
Ultrashort pulse propagation in high gain optical fiber amplifiers with normal dispersion is studied by self-similarity analysis of the nonlinear Schrödinger equation with gain. An exact asymptotic solution is found, corresponding to a linearly chirped parabolic pulse which propagates self-similarly subject to simple scaling rules. The solution has been confirmed by numerical simulations and experiments studying propagation in a Yb-doped fiber amplifier. Additional experiments show that the pulses remain parabolic after propagation through standard single mode fiber with normal dispersion.
通过对含增益的非线性薛定谔方程进行自相似分析，研究了正色散高增益光纤放大器中的超短脉冲传播。找到了一个精确的渐近解，它对应于一个线性啁啾抛物线脉冲，该脉冲根据简单的缩放规则自相似地传播。通过在掺镱光纤放大器中的传播数值模拟和实验，证实了该解。额外的实验表明，脉冲在通过具有正色散的标准单模光纤传播后仍保持抛物线形状。
