CAJ | 학술논문

提出采用凸形色散平坦光纤(DFF-CVDP)传输亚皮秒啁啾孤子,利用分步傅里叶方法数值研究了亚皮秒啁啾孤子在DFF-CVDP中的传输特性,并与在线性色散平坦光纤(DFF-LDP)中的传输特性做了比较.结果表明,孤子脉冲在上述两种光纤中传输时,光纤损耗导致了孤子脉冲宽度随传输距离增加稍有展宽,脉冲方均根谱宽随传输距离增加逐渐减小.在DFF-LDP中,脉冲展宽更快,正啁啾对脉冲展宽的影响比负啁啾的影响更大,正啁啾对应的方均根光谱比其他情况下的宽得多.啁啾脉冲时域宽度随传输距离增加出现了衰减振荡,振荡周期和振幅随啁啾参量|C|的增加而增大.光孤子脉冲在两种光纤中传输时域波形保持不变,仍具有孤子特性.在DFF-LDP中,β_3使得脉冲光谱红移从而诱导了脉冲时延,负啁啾减弱了β_3的作用,正啁啾加强了β_3的影响.在DFF-CVDP中传输可以忽略β_3的影响.
제출채용철형색산평탄광섬(DFF-CVDP)전수아피초조추고자,이용분보부리협방법수치연구료아피초조추고자재DFF-CVDP중적전수특성,병여재선성색산평탄광섬(DFF-LDP)중적전수특성주료비교.결과표명,고자맥충재상술량충광섬중전수시,광섬손모도치료고자맥충관도수전수거리증가초유전관,맥충방균근보관수전수거리증가축점감소.재DFF-LDP중,맥충전관경쾌,정조추대맥충전관적영향비부조추적영향경대,정조추대응적방균근광보비기타정황하적관득다.조추맥충시역관도수전수거리증가출현료쇠감진탕,진탕주기화진폭수조추삼량|C|적증가이증대.광고자맥충재량충광섬중전수시역파형보지불변,잉구유고자특성.재DFF-LDP중,β_3사득맥충광보홍이종이유도료맥충시연,부조추감약료β_3적작용,정조추가강료β_3적영향.재DFF-CVDP중전수가이홀략β_3적영향.
The sub-picosecond chirped soliton propagation is proposed in the dispersion-flatted fiber with convex dispersion profile (DFF-CVDP). Propagation characteristics of the soliton in the DFF-CVDP are numerically investigated by use of the split-step Fourier method, are compared with those in the DFF with linear dispersion profile (DFF-LDP). It is induced by fiber loss that the temporal width of the chirped soliton slightly increases with the increase of propagation distance, the Root-Mean-Square(RMS)spectral width gradually decreases. When the soliton propagates in the DFF-LDP, the soliton broadens faster than that in the DFF-CVDP, effect of positive chirp on pulse broadening is greater than that of negative chirp, the RMS spectrum for positive chirp is wider than those for other cases. The temporal width of the chirped soliton performs a damped oscillation with the increase of propagation distance. The period and amplitude of the oscillation increase with the increase of the chirp parameter |C|. The soliton still maintains soliton characteristics with the hyperbolic secant curve in the two fibers. The time-delay and red-shift of the soliton is induced by the third-order dispersion (β_3) in the DFF-LDP. The effect of β_3 is weakened by the negative chirp, is enhanced by the positive chirp. The effect of β_3 can be neglected in the DFF-CVDP.