EFFECT OF THE RAMAN PART OF THE NONLINEAR REFRACTIVE-INDEX ON PROPAGATION OF ULTRASHORT OPTICAL PULSES IN FIBERS

被引:67
作者
STOLEN, RH [1 ]
TOMLINSON, WJ [1 ]
机构
[1] BELL COMMUN RES INC,RED BANK,NJ 07701
关键词
D O I
10.1364/JOSAB.9.000565
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
For ultrashort optical pulses propagating in silica optical fibers, the Raman contribution to the effective nonlinear refractive index decreases for pulse widths less than approximately 100 fsec. By numerical simulation, we show that this contribution not only decreases, but becomes negative, for pulse widths less than approximately 30 fs. This negative contribution can be understood in both time and frequency domains and comes from the finite time delay inherent in the Raman response. We expect that these features of the Raman contribution to the nonlinear refractive index will be especially important in high-nonlinearity glasses.
引用
收藏
页码:565 / 573
页数:9
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