Soliton states in a nonlinear directional coupler with intermodal dispersion
- 作者：Rastogi ; Vipul ; Chiang ; Kin Seng ; Akhmediev ; Nail N.
- 关键词：42.65.Tg ; 42.81.Dp ; 42.81.Qb ; Nonlinear directional couplers ; Optical switches ; Nonlinear fiber optics ; Pulse propagation ; Solitons ; Intermodal dispersion
- 刊名：Physics Letters A
- 出版年：2002
- 期刊代码：57_03759601
- 类别：ph
- 出版时间：August 19, 2002
- 卷：301
- 期：1-2
- 页码：27-34
- 文件大小：277 K
摘要
We study numerically the propagation of short optical pulses in a nonlinear directional coupler that possesses significant intermodal dispersion. Using the split-step method with fast Fourier transform, we calculate the soliton solutions of such a coupler and highlight the effect of intermodal dispersion on the propagation dynamics of the pulses. We find that the intermodal dispersion has only a small effect on the shape of the soliton states, in spite of the fact that it can distort and break up low-energy pulses launched into one arm of the coupler. The intermodal dispersion, however, can cause a drift in the velocity of the soliton pulses.